SpringBoot的Web开发支持【超详细【一篇搞定】果断收藏系列】

旧城等待， 2022-11-16 04:58 212阅读 0赞

### SpringBoot的Web开发支持 ###

*  常用的服务器配置
 *  使用Jetty服务器替换Tomcat
 *   *  排除Tomcat的启动器，引入Jetty
     *  application.yml
     *  编写入口程序
     *  编写Controller测试
     *  测试结果
 *  Jetty对jsp的支持
 *   *  添加依赖
     *  SpringBoot集成使用jsp
     *  编写一个jsp
     *  编写Controller
     *  测试结果
     *  配置上下文
     *   *  编写user\_list.jsp
         *  编写Controller
         *  测试结果
 *  打包（jar和war）
 *   *  引入所需的插件
     *  打包
     *  打开war包所在文件位置
     *  在此处打开cmd，输入启动的命令
     *  访问jsp页面
 *  对静态资源的配置
 *  自定义资源映射
 *   *  static-locations
     *  static-path-pattern
 *  配置自定义的Convert解决日期类型的参数转换
 *  自定义拦截器的配置
 *   *  自定义类实现HandlerInterceptor接口
     *  使用Java的形式配置拦截器的拦截路径
 *  自定义页面跳转
 *  自定义资源映射
 *  错误处理、异常处理
 *   *  使用Java异常处理器
 *  文件上传与下载
 *   *  项目目录
     *  pom.xml
     *  启动类
     *  controller
     *  application.yml
     *  SpringBoot集成使用jsp（超详细）
     *  jsp
     *  效果
 *  SpringBoot数据校验
 *   *  问题引入
     *  样例代码
     *  效果
 *  注册Servlet三大组件【Servlet、Filter、Listener】
 *   *  使用ServletComponentScan注解扫描
     *   *  在启动类上添加@ServletComponentScan
         *  定义Servlet
         *  定义的Filter
         *  定义Listener
         *  效果
     *  使用registration的Bean注册组件
     *   *  使用@Bean配合RegistrationBean类型注册
         *  定义Servlet
         *  定义Filter
         *  定义Listener
         *  使用Bean注解定义跨域的Filter
         *  第二种跨域方式
         *  效果

**使用spring-boot-starter-web启动器，开始web支持，内嵌一个Tomcat，添加了对于SpringMVC的支持。Spring Boot默认servlet容器为tomcat。**

**Spring Boot supports the following embedded servlet containers:**

<table> 
 <thead> 
  <tr> 
   <th>Name</th> 
   <th>Servlet</th> 
   <th>Version</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>Tomcat</td> 
   <td>9.0</td> 
   <td>4.0</td> 
  </tr> 
  <tr> 
   <td>Jetty</td> 
   <td>9.4</td> 
   <td>3.1</td> 
  </tr> 
  <tr> 
   <td>Undertow</td> 
   <td>2.0</td> 
   <td>4.0</td> 
  </tr> 
 </tbody> 
</table>

# 常用的服务器配置 #

*  **配置端口号Spring Boot 默认端口是8080，如果想要进行更改的话，在配置文件中加入：server.port=8081**
 *  **配置session的超时时间server.servlet.session.timeout=2M**

# 使用Jetty服务器替换Tomcat #

**项目目录：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70]

## 排除Tomcat的启动器，引入Jetty ##

**pom.xml：**

<dependencies>
    
       <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jetty</artifactId>
        </dependency>
        
    </dependencies>

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 1]

## application.yml ##

**application.yml：**

server:
      port: 80

## 编写入口程序 ##

**入口程序：**

package com.keafmd;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    /** * Keafmd * * @ClassName: App03 * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-06 13:57 * @Blog: https://keafmd.blog.csdn.net/ */
    @SpringBootApplication
    public class App03 { 
        public static void main(String[] args) { 
            SpringApplication.run(App03.class,args);
        }
    }

## 编写Controller测试 ##

**Controller测试：**

package com.keafmd.controller;
    
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    /** * Keafmd * * @ClassName: JettyController * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-06 13:56 * @Blog: https://keafmd.blog.csdn.net/ */
    @RestController
    public class JettyController { 
    
        /** * http://127.0.0.1:80/hello * @return */
    
        @GetMapping("/hello")
        public String hello(){ 
    
            return "hello keafmd";
        }
    
    }

## 测试结果 ##

**运行启动类，效果如下：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 2]

**访问：http://127.0.0.1:80/hello**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 3]

# Jetty对jsp的支持 #

## 添加依赖 ##

**springboot中的jetty为内嵌的jetty，支持jsp需要添加额外的依赖。**

**在pom.xml中添加如下依赖：**

<dependency>
              <groupId>org.eclipse.jetty</groupId>
              <artifactId>jetty-server</artifactId>
          </dependency>
          <dependency>
              <groupId>org.eclipse.jetty</groupId>
              <artifactId>apache-jsp</artifactId>
          </dependency>
          <dependency>
              <groupId>org.eclipse.jetty</groupId>
              <artifactId>apache-jstl</artifactId>
          </dependency>

## SpringBoot集成使用jsp ##

**需要设置：[SpringBoot集成使用jsp（超详细）][SpringBoot_jsp]**

## 编写一个jsp ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 4]  
**注意是在webapp的目录下。**

**index.jsp：**

<%--
      Created by IntelliJ IDEA.
      User: lenovo
      Date: 2021/4/6
      Time: 14:41
      To change this template use File | Settings | File Templates.
    --%>
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>Title</title>
    </head>
    <body>
    <h1>Keafmd</h1>
    
    </body>
    </html>

## 编写Controller ##

**JspController：**

package com.keafmd.controller;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.GetMapping;
    
    /** * Keafmd * * @ClassName: JspController * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-06 14:43 * @Blog: https://keafmd.blog.csdn.net/ */
    @Controller
    public class JspController { 
    
        /** * http://127.0.0.1/keafmd * @return */
    
        @GetMapping("/keafmd")
        public String keafmd(){ 
            return "/index.jsp";
        }
    
    }

## 测试结果 ##

**我提前配置好了80端口。  
访问：http://127.0.0.1/keafmd**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 5]

## 配置上下文 ##

**application.yml：**

server:
      port: 80
    spring:
      mvc:
        view:
          prefix: /WEB-INF/user/
          suffix: .jsp

### 编写user\_list.jsp ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 6]  
**user\_list.jsp：**

<%--
      Created by IntelliJ IDEA.
      User: lenovo
      Date: 2021/4/6
      Time: 14:45
      To change this template use File | Settings | File Templates.
    --%>
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>Title</title>
    </head>
    <body>
    <h1>User_List</h1>
    
    </body>
    </html>

### 编写Controller ###

**JspController：**

### 测试结果 ###

**访问：http://127.0.0.1/userlist**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 7]

# 打包（jar和war） #

**区别：打jar包不能访问jsp资源，war包可以。**

## 引入所需的插件 ##

<build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <fork>true</fork>
                </configuration>
            </plugin>
        </plugins>
    </build>

## 打包 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 8]

## 打开war包所在文件位置 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 9]

## 在此处打开cmd，输入启动的命令 ##

java -jar xxxxx.war/.jar

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 10]

## 访问jsp页面 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 11]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 12]

> **打jar包的话是访问不到user\_list.jsp的，这里就不测试了。**

# 对静态资源的配置 #

**把类路径下的 /static、/public、/resources 和 /META-INF/resources 文件夹下的静态文件直接映射为 /，可以直接通过 http://localhost:8080/ 访问。**

**在resources下创建static目录，在创建common目录，然后创建tt.css。**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 13]  
**访问：http://127.0.0.1:8080/common/tt.css**

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 14]

# 自定义资源映射 #

## static-locations ##

**默认支持的文件路径：classpath:/static,classpath:/public,classpath:/resources,classpath:/META-INF/resources**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 15]  
**mm.css：**

body{ 
        padding: 0;
    }

**tt.css：**

body{ 
        margin: 0;
        padding: 0;
    }

**在我们没有在application.yml配置文件配置前，访问：http://localhost:8080/mm.css，结果如下↓**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 16]

> **因为mm.css在自定义的mystatic文件夹下，不被静态资源识别，需要自定义。**

**但是可以直接访问：http://localhost:8080/common/tt.css，因为tt.css在static文件夹下。**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 17]  
**当我们在application.yml配置文件夹下添加上自定义的文件夹后就可以访问了。**

**application.yml：**

spring:
      mvc:
        static-path-pattern: /**
      web:
        resources:
          static-locations: classpath:/mystatic,classpath:/static,classpath:/public,classpath:/resources,classpath:/META-INF/resources

**访问：http://localhost:8080/mm.css，结果如下↓，配置后可以直接访问。**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 18]

## static-path-pattern ##

**当我们修改application.xml文件后：**

spring:
      mvc:
        static-path-pattern: /css/**
      web:
        resources:
          static-locations: classpath:/mystatic,classpath:/static,classpath:/public,classpath:/resources,classpath:/META-INF/resources

**像上面那样访问都是失败的了**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 19]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 20]  
**我们需要加上`/css`才可以**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 21]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 22]

# 配置自定义的Convert解决日期类型的参数转换 #

> **Convert、Formatter：用于接收浏览器请求的参数自动转化成响应类型的数据Stirng（1988-01-01）-Date（1988-01-01）**

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 23]

**User：**

package com.keafmd.entity;
    
    import lombok.Data;
    
    import java.util.Date;
    
    /** * Keafmd * * @ClassName: User * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-07 9:53 * @Blog: https://keafmd.blog.csdn.net/ */
    @Data
    public class User { 
        private String id;
        private Integer age;
        private String address;
        private Date createTime;
    }

**ConverterController：**

package com.keafmd.controller;
    
    import com.keafmd.entity.User;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    /** * Keafmd * * @ClassName: ConverterController * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-07 9:54 * @Blog: https://keafmd.blog.csdn.net/ */
    @RestController
    public class ConverterController { 
    
    
        /** * http://127.0.0.1:8080/user?createTime=2021-04-07 01:02:03 * @param user * @return */
        @GetMapping("/user")
        User getUserInfo(User user){ 
            return user;
        }
    }

**DateConverter：**

package com.keafmd.config;
    
    import org.springframework.core.convert.converter.Converter;
    
    import java.text.ParseException;
    import java.text.SimpleDateFormat;
    import java.util.Date;
    /** * Keafmd * * @ClassName: DateConverter * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-07 9:58 * @Blog: https://keafmd.blog.csdn.net/ */
    public class DateConverter implements Converter<String, Date> { 
        /** * yyyy-MM-dd * * @param source * @return */
        @Override
        public Date convert(String source) { 
            try { 
                return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(source);
            } catch (ParseException e) { 
                e.printStackTrace();
            }
            return null;
        }
    
    
    }

**BootWebMvcConfig：**

package com.keafmd.config;
    
    import org.springframework.context.annotation.Configuration;
    import org.springframework.format.FormatterRegistry;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
    
    
    /** * Keafmd * * @ClassName: BootWebMvcConfig * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-07 10:27 * @Blog: https://keafmd.blog.csdn.net/ */
    @Configuration(proxyBeanMethods = false)
    public class BootWebMvcConfig implements WebMvcConfigurer { 
    
        @Override
        public void addFormatters(FormatterRegistry registry) { 
            registry.addConverter(new DateConverter());
        }
    }

**还需要在application.yml配置一下时区和格式。**

**application.yml：**

spring:
      jackson:
        time-zone: GMT+8
        date-format: yyyy-MM-dd HH:mm:ss

**启动springboot，访问：http://127.0.0.1:8080/user?createTime=2021-04-07 01:02:03**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 24]

# 自定义拦截器的配置 #

**实现基础springmvc的拦截器**

## 自定义类实现HandlerInterceptor接口 ##

**MyInterceptor：**

package com.keafmd.config;
    
    import org.springframework.web.servlet.HandlerInterceptor;
    import org.springframework.web.servlet.ModelAndView;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    /** * Keafmd * * @ClassName: MyInterceptor * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-07 11:41 * @Blog: https://keafmd.blog.csdn.net/ */
    public class MyInterceptor implements HandlerInterceptor { 
        @Override
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { 
            System.out.println("MyInterceptor.preHandle");
            return true;
        }
    
        @Override
        public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { 
            System.out.println("MyInterceptor.postHandle");
        }
    
        @Override
        public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { 
            System.out.println("MyInterceptor.afterCompletion");
        }
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 25]

## 使用Java的形式配置拦截器的拦截路径 ##

**在WebMvcConfig中注册拦截器,实现WebMvcConfigrer接口，并声明Bean。**

**BootWebMvcConfig：**

package com.keafmd.config;
    
    import org.springframework.context.annotation.Configuration;
    import org.springframework.format.FormatterRegistry;
    import org.springframework.web.servlet.HandlerExceptionResolver;
    import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
    import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
    
    import java.util.List;
    
    
    /** * Keafmd * * @ClassName: BootWebMvcConfig * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-07 10:27 * @Blog: https://keafmd.blog.csdn.net/ */
    @Configuration(proxyBeanMethods = false)
    public class BootWebMvcConfig implements WebMvcConfigurer { 
    
        @Override
        public void addFormatters(FormatterRegistry registry) { 
            registry.addConverter(new DateConverter());
        }
    
        @Override
        public void addInterceptors(InterceptorRegistry registry) { 
            //注册拦截
            registry.addInterceptor(new MyInterceptor()).addPathPatterns("/**");
        }
    
        @Override
        public void addResourceHandlers(ResourceHandlerRegistry registry) { 
    
        }
    
        @Override
        public void configureHandlerExceptionResolvers(List<HandlerExceptionResolver> resolvers) { 
    
        }
    }

# 自定义页面跳转 #

**BootWebMvcConfig：**

package com.keafmd.config;
    
    import org.springframework.context.annotation.Configuration;
    import org.springframework.format.FormatterRegistry;
    import org.springframework.web.servlet.HandlerExceptionResolver;
    import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
    import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
    import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
    
    import java.util.List;
    
    
    /** * Keafmd * * @ClassName: BootWebMvcConfig * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-07 10:27 * @Blog: https://keafmd.blog.csdn.net/ */
    @Configuration(proxyBeanMethods = false)
    public class BootWebMvcConfig implements WebMvcConfigurer { 
    
        @Override
        public void addFormatters(FormatterRegistry registry) { 
            registry.addConverter(new DateConverter());
        }
    
        @Override
        public void addInterceptors(InterceptorRegistry registry) { 
            //注册拦截
            registry.addInterceptor(new MyInterceptor()).addPathPatterns("/**");
        }
    
    
    
        /** * 映射自定义的跳转界面 * @param registry */
        @Override
        public void addViewControllers(ViewControllerRegistry registry) { 
            registry.addViewController("/index").setViewName("index.html");
            registry.addViewController("/home").setViewName("index.html");
    
        }
    
    }

# 自定义资源映射 #

**1、自动配置（在全局额配置文件中修改）**

> **spring.mvc.static-path-pattern=/  
> spring.resources.static-locations= classpath:/static,classpath:/public,classpath:/resources,classpath:/META-INF/resources**

**2、自定义资源路径**

> **自定义资源映射,重写WebMvcConfiger实现类的 重写addResourceHandler 方法  
> 调用：addResourceHandler 用于处理哪些路径是静态资源  
> 调用：addResourceLocations用于指定静态资源的实际目录  
> 此方法会覆盖配置文件和默认的静态资源配置**

**BootWebMvcConfig：**

package com.keafmd.config;
    
    import org.springframework.context.annotation.Configuration;
    import org.springframework.format.FormatterRegistry;
    import org.springframework.web.servlet.HandlerExceptionResolver;
    import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
    import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
    import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
    
    import java.util.List;
    
    
    /** * Keafmd * * @ClassName: BootWebMvcConfig * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-07 10:27 * @Blog: https://keafmd.blog.csdn.net/ */
    @Configuration(proxyBeanMethods = false)
    public class BootWebMvcConfig implements WebMvcConfigurer { 
    
        @Override
        public void addFormatters(FormatterRegistry registry) { 
            registry.addConverter(new DateConverter());
        }
    
        @Override
        public void addInterceptors(InterceptorRegistry registry) { 
            //注册拦截
            registry.addInterceptor(new MyInterceptor()).addPathPatterns("/**");
        }
    
        @Override
        public void addResourceHandlers(ResourceHandlerRegistry registry) { 
    
            /** * http://127.0.0.1:8080/images/holiday.png */
            // registry.addResourceHandler()
            // registry.addResourceHandler("/images/").addResourceLocations("classpath:/imgs/");
            registry.addResourceHandler("/images/**").
                    addResourceLocations("classpath:/imgs/",
                            "classpath:/mystatic/" ,
                            "classpath:/static/" ,
                            "classpath:/public/" ,
                            "classpath:/META-INF/resources",
                            "classpath:/resources");
    
        }
    }

# 错误处理、异常处理 #

**错误的类型：**

*  **因为后台程序出错导致的Exception（http 500）**
 *  **因为参数传递错误（http 400）**
 *  **客户端的原因造成的路径不对（http 404）**

**当有错误产生，默认跳转到/error，指向的是BasicErrorController。**

> **定制错误响应：  
> 1、有模板引擎的情况下；error/状态码; 【将错误页面命名为 错误状态码.html 放在模板引擎文件夹里面的error文件夹下】，发生此状态码的错误就会来到对应的页面  
> 2、没有模板引擎（模板引擎找不到这个错误页面），静态资源文件夹下找  
> 3、以上都没有错误页面，就是默认来到Spring Boot默认的错误提示页面  
> 可以使用4xx和5xx作为错误页面的文件名来匹配这种类型的所有错误，精确优先（优先寻找精确的状态码.html）**

> **页面能获取的信息：  
> timestamp：时间戳  
> status：状态码  
> error：错误提示  
> exception：异常对象  
> message：异常消息  
> errors：JSR303数据校验的错误都在这里**

**在WebMvcConfiger的实现类中重写addViewConroller方法。**

## 使用Java异常处理器 ##

> **1、在Controller层面定义异常处理，哪里有异常哪里处理，只在某一个Controller中生效**

**JspController：**

package com.keafmd.controller;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.ExceptionHandler;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.ResponseBody;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    /** * Keafmd * * @ClassName: JspController * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-07 14:09 * @Blog: https://keafmd.blog.csdn.net/ */
    @Controller
    public class JspController { 
        /** * http://127.0.0.1:8080/toview * @return */
        @GetMapping("/toview")
        String toview(){ 
            return "/hello.jsp";
        }
    
    
        @GetMapping("/business")
        String business(){ 
            int result = 0/0;
            return "/index.jsp";
        }
    
    
       /* @ExceptionHandler(value = Exception.class ) @ResponseBody String resolveException(HttpServletRequest request, HttpServletResponse response, Exception ex ){ System.out.println(ex.getMessage()); return "{status:'unup',msg:'出错了'}"; }*/
    }

> **2、定义全局的异常处理方式，定义一个类使用@ControllerAdvice ，在类中定义@ExceptionHandler的注解方法。**

**MyControllerAdvice：**

package com.keafmd.controller;
    
    import org.springframework.web.bind.annotation.ExceptionHandler;
    import org.springframework.web.bind.annotation.RestControllerAdvice;
    import org.springframework.web.servlet.ModelAndView;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    /** * Keafmd * * @ClassName: MyControllerAdvice * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-07 14:07 * @Blog: https://keafmd.blog.csdn.net/ */
    @RestControllerAdvice
    public class MyControllerAdvice { 
    
        @ExceptionHandler(value = Exception.class )
    // @ResponseBody
        String resolveException(HttpServletRequest request, HttpServletResponse response, Exception ex  ){ 
    
            System.out.println(ex.getMessage());
            return "{status:'unup',msg:'全局的处理，Controller出错了'}";
        }
    }

**效果：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 26]

# 文件上传与下载 #

## 项目目录 ##

**新建个项目：springboot-file**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 27]

## pom.xml ##

**pom.xml：**

## 启动类 ##

**启动类AppFile：**

package com.keafmd;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    /** * Keafmd * * @ClassName: AppFile * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-07 15:08 * @Blog: https://keafmd.blog.csdn.net/ */
    
    @SpringBootApplication
    public class AppFile { 
        public static void main(String[] args) { 
            SpringApplication.run(AppFile.class,args);
        }
    }

## controller ##

**BootConstants：**

package com.keafmd.controller;
    
    /** * Keafmd * * @ClassName: BootConstants * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-07 16:07 * @Blog: https://keafmd.blog.csdn.net/ */
    public interface BootConstants { 
        public static final String UPLOAD_DIR ="D:\\upload";
    }

**FileUploadController ：**

package com.keafmd.controller;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.PostMapping;
    import org.springframework.web.multipart.MultipartFile;
    
    import java.io.File;
    import java.io.IOException;
    import java.util.UUID;
    
    /** * Keafmd * * @ClassName: FileUploadController * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-07 15:05 * @Blog: https://keafmd.blog.csdn.net/ */
    @Controller
    public class FileUploadController { 
    
    
        @PostMapping("upload")
        String upload(MultipartFile pic) throws IOException { 
            //1 将临时空间的文件，转储到 D:\\upload
            String originalFileName = pic.getOriginalFilename();
            //扩展名
            String ext = originalFileName.substring(originalFileName.lastIndexOf("."));
            //转储的新文件名
            String newFileName = UUID.randomUUID().toString() + ext;
            //转储到 D:\\upload 下的 uuid.png/uuid.jpg
            pic.transferTo(new File(BootConstants.UPLOAD_DIR, newFileName));
            //2 将数据存储到 db
            /** * 当前时间 * 上传的ip * 操作的工号 * 上传的文件名 * */
    
            //3 跳转到列表页
    
            return "redirect:/list";
        }
    
    
        @GetMapping("list")
        String list(Model model) throws IOException { 
    
            File[] list = new File(BootConstants.UPLOAD_DIR).listFiles();
    
            model.addAttribute("fileList",list);
    
            return "/list.jsp";
        }
    
    }

**DownloadController ：**

package com.keafmd.controller;
    
    import org.springframework.core.io.FileSystemResource;
    import org.springframework.http.HttpHeaders;
    import org.springframework.http.MediaType;
    import org.springframework.http.ResponseEntity;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.PathVariable;
    
    import javax.servlet.http.HttpServletResponse;
    import java.io.*;
    
    /** * Keafmd * * @ClassName: DownloadController * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-07 16:10 * @Blog: https://keafmd.blog.csdn.net/ */
    @Controller
    public class DownloadController { 
    
    
        /** * 3000 * * 1024 1024 (2048) 954 * * * @param path * @param response * @throws IOException */
    
        @GetMapping("/d1/{path}")
        public void download(@PathVariable String path , HttpServletResponse response) throws IOException { 
    
            response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
            response.addHeader(HttpHeaders.CONTENT_DISPOSITION,"attachment;filename="+path);
    
            InputStream is = new FileInputStream(new File(BootConstants.UPLOAD_DIR,path));
            OutputStream os = response.getOutputStream();
            int len = -1;
            byte[] bytes = new byte[1024];
            while (   (len = is.read(bytes)) != -1){ 
                os.write(bytes,0,len);
            }
            os.close();
            is.close();
        }
    
        @GetMapping("/d2/{path}")
        public ResponseEntity download2(@PathVariable String path ) throws IOException { 
    
            return ResponseEntity.ok().
                    header(HttpHeaders.CONTENT_TYPE,"application/octet-stream").
                    header(HttpHeaders.CONTENT_DISPOSITION,"attachment;filename="+path).
                    body(new FileSystemResource(new File(BootConstants.UPLOAD_DIR,path)));
        }
    
    
    }

**AppConfig ：**

package com.keafmd.config;
    
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
    import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
    
    /** * Keafmd * * @ClassName: AppConfig * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-07 16:05 * @Blog: https://keafmd.blog.csdn.net/ */
    @Configuration
    public class AppConfig implements WebMvcConfigurer { 
    
        /** * http://127.0.0.1/form * @param registry */
        @Override
        public void addViewControllers(ViewControllerRegistry registry) { 
            registry.addViewController("/form").setViewName("/upload.jsp");
        }
    
    
        /** * http://127.0.0.1/down/ae37a66f-aec3-4e23-b2ed-7267adcfb2bb.png * @param registry */
        @Override
        public void addResourceHandlers(ResourceHandlerRegistry registry) { 
            registry.addResourceHandler("/down/**").addResourceLocations("file:D:\\upload\\");
        }
    
    }

## application.yml ##

server:
      port: 80

## SpringBoot集成使用jsp（超详细） ##

**点这里：[SpringBoot集成使用jsp（超详细）][SpringBoot_jsp]**

## jsp ##

**list.jsp：**

<%--
      Created by IntelliJ IDEA.
      User: lenovo
      Date: 2021/4/7
      Time: 15:07
      To change this template use File | Settings | File Templates.
    --%>
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
    <html>
    <head>
        <title>Title</title>
    </head>
    <body>
    
    <table border="1" cellspacing="0" cellpadding="0" width="100%">
        <tr>
            <th>序号</th>
            <th>文件名称</th>
            <th>操作</th>
        </tr>
    
        <c:forEach items="${fileList}" var="file" varStatus="stat">
            <tr>
                <td>${ stat.count}</td>
                <td>${ file.getName()}</td>
                <td>
                    <a href="${pageContext.request.contextPath}/down/04971284-d789-470a-a991-4d690c36b4ac.jpg">下载1</a>
                    <a href="${pageContext.request.contextPath}/d1/04971284-d789-470a-a991-4d690c36b4ac.jpg">下载2</a>
                    <a href="${pageContext.request.contextPath}/d2/04971284-d789-470a-a991-4d690c36b4ac.jpg">下载3</a>
                </td>
            </tr>
        </c:forEach>
    </table>
    </body>
    </html>

**upload.jsp：**

<%--
      Created by IntelliJ IDEA.
      User: lenovo
      Date: 2021/4/7
      Time: 16:10
      To change this template use File | Settings | File Templates.
    --%>
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>Title</title>
    </head>
    <body>
    
    <form method="post" action="${pageContext.request.contextPath}/upload" enctype="multipart/form-data">
    
        <input type="file" name="pic">
    
    
        <input type="submit" value="上传头像" >
    
    </form>
    
    
    
    </body>
    </html>

## 效果 ##

**上传：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 28]  
**下载：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 29]

# SpringBoot数据校验 #

## 问题引入 ##

**      我们在传参的时候，有时候需要对传的参数进行验证是否符合要求，这就需要就行数据校验了。**

## 样例代码 ##

**说明：SpringBoot的2.2.x版本之前，如果使用starter-web默认包含校验框架，2.3.x之后或者没有使用starter-web，需要添加starter-validation的校验框架。**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 30]

**common的pom.xml：**

**spring-boot-06的pom.xml：**

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.4.4</version>
            <relativePath/> 
        </parent>
        <groupId>com.keafmd</groupId>
        <artifactId>spring-boot-06</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>spring-boot-06</name>
        <description>Demo project for Spring Boot</description>
        <properties>
            <java.version>1.8</java.version>
        </properties>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
    
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <scope>runtime</scope>
            </dependency>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <optional>true</optional>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
            <dependency>
                <groupId>com.keafmd</groupId>
                <artifactId>common</artifactId>
                <version>1.0-SNAPSHOT</version>
            </dependency>
    
            <dependency>
                <groupId>org.hibernate.validator</groupId>
                <artifactId>hibernate-validator</artifactId>
            </dependency>
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                    <configuration>
                        <excludes>
                            <exclude>
                                <groupId>org.projectlombok</groupId>
                                <artifactId>lombok</artifactId>
                            </exclude>
                        </excludes>
                    </configuration>
                </plugin>
            </plugins>
        </build>
    
    </project>

**common的实体类User：**

package com.keafmd.entity;
    
    import lombok.Data;
    
    import javax.validation.constraints.Max;
    import java.util.Date;
    
    /** * Keafmd * * @ClassName: User * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-08 9:07 * @Blog: https://keafmd.blog.csdn.net/ */
    @Data
    public class User { 
    
        private String id;
    
        @Max(value = 18,message = "年龄不符合")
        private Integer age;
        private String address;
        private Date createTime;
    }

**UserController：**

package com.keafmd.controller;
    
    import com.keafmd.entity.User;
    import org.springframework.stereotype.Controller;
    import org.springframework.validation.BindingResult;
    import org.springframework.validation.annotation.Validated;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.PostMapping;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    /** * Keafmd * * @ClassName: UserController * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-08 9:10 * @Blog: https://keafmd.blog.csdn.net/ */
    @RestController
    @RequestMapping("user")
    public class UserController { 
    
        /** * http://127.0.0.1/user/save?age=20 * @param user * @return */
        @RequestMapping("save")
        User save(@Validated User user,BindingResult bindingResult){ 
            System.out.println(bindingResult.getFieldError().getDefaultMessage());
            return user;
        }
    
    }

**SpringBoot06Application**

package com.keafmd;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    @SpringBootApplication
    public class SpringBoot06Application { 
    
        public static void main(String[] args) { 
            SpringApplication.run(SpringBoot06Application.class, args);
        }
    
    }

## 效果 ##

**浏览器访问：http://127.0.0.1/user/save?age=20**

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 31]  
**idea控制台的输出信息：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 32]

# 注册Servlet三大组件【Servlet、Filter、Listener】 #

## 使用ServletComponentScan注解扫描 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 33]

### 在启动类上添加@ServletComponentScan ###

**SpringBoot06Application：**

package com.keafmd;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.boot.web.servlet.ServletComponentScan;
    
    @SpringBootApplication
    @ServletComponentScan
    public class SpringBoot06Application { 
    
        public static void main(String[] args) { 
            SpringApplication.run(SpringBoot06Application.class, args);
        }
    
    }

### 定义Servlet ###

**FirstSerlvet ：**

package com.keafmd.servletcomponent;
    
    import javax.servlet.ServletException;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.IOException;
    
    /** * Keafmd * * @ClassName: FirstSerlvet * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-08 9:55 * @Blog: https://keafmd.blog.csdn.net/ */
    
    /** * http://127.0.0.1/my */
    @WebServlet(urlPatterns = "/my")
    public class FirstSerlvet extends HttpServlet { 
        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { 
            doPost(req, resp);
        }
    
        @Override
        protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { 
            System.out.println("FirstSerlvet.doPost");
            System.out.println("sessionid： "+req.getSession().getId());
        }
    }

### 定义的Filter ###

**FirstFilter：**

package com.keafmd.servletcomponent;
    
    
    import javax.servlet.*;
    import javax.servlet.annotation.WebFilter;
    import java.io.IOException;
    
    /** * Keafmd * * @ClassName: FirstFilter * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-08 9:56 * @Blog: https://keafmd.blog.csdn.net/ */
    @WebFilter(urlPatterns="/*")
    public class FirstFilter implements Filter { 
        @Override
        public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { 
            System.out.println("FirstFilter.doFilter");
            filterChain.doFilter(servletRequest,servletResponse);
        }
    }

### 定义Listener ###

**FirstListener：**

package com.keafmd.servletcomponent;
    
    import javax.servlet.annotation.WebListener;
    import javax.servlet.http.HttpSessionEvent;
    import javax.servlet.http.HttpSessionListener;
    
    /** * Keafmd * * @ClassName: FirstListener * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-08 9:57 * @Blog: https://keafmd.blog.csdn.net/ */
    @WebListener
    public class FirstListener implements HttpSessionListener { 
        @Override
        public void sessionCreated(HttpSessionEvent se) { 
            System.out.println("FirstListener.sessionCreated: Session被创建");
        }
    }

### 效果 ###

**访问：http://127.0.0.1/my**

**访问后，前端不会有什么效果。**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 34]  
**idea的控制台的输出证明使用成功。**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 35]  
**注意：当我们二次访问http://127.0.0.1/my的时候session应该是一样的。**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 36]

## 使用registration的Bean注册组件 ##

> **三大组件使用代码（不需要，@WebListener、@WebServlet(urlPatterns = “/servlet”)、@WebFilter(urlPatterns = “/\*”)）**

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 37]  
**pom.xml：**

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.4.4</version>
            <relativePath/> 
        </parent>
        <groupId>com.keafmd</groupId>
        <artifactId>spring-boot-07</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>spring-boot-07</name>
        <description>Demo project for Spring Boot</description>
        <properties>
            <java.version>1.8</java.version>
        </properties>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
    
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <optional>true</optional>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                    <configuration>
                        <excludes>
                            <exclude>
                                <groupId>org.projectlombok</groupId>
                                <artifactId>lombok</artifactId>
                            </exclude>
                        </excludes>
                    </configuration>
                </plugin>
            </plugins>
        </build>
    
    </project>

**application.yml：**

server:
      port: 80

### 使用@Bean配合RegistrationBean类型注册 ###

**Appconfig：**

package com.keafmd.servlet.config;
    
    import com.keafmd.servlet.component.MySessionListener;
    import com.keafmd.servlet.component.SecondFilter;
    import com.keafmd.servlet.component.SecondServlet;
    
    import org.springframework.boot.web.servlet.FilterRegistrationBean;
    import org.springframework.boot.web.servlet.ServletListenerRegistrationBean;
    import org.springframework.boot.web.servlet.ServletRegistrationBean;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.cors.CorsConfiguration;
    import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
    import org.springframework.web.filter.CorsFilter;
    import org.springframework.web.servlet.config.annotation.CorsRegistry;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
    
    /** * Keafmd * * @ClassName: Appconfig * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-08 17:40 * @Blog: https://keafmd.blog.csdn.net/ */
    @Configuration(proxyBeanMethods = false)
    public class Appconfig implements WebMvcConfigurer { 
    
    
        // 使用@Bean配合RegistrationBean类型注册 -- star
        /** * http://127.0.0.1:80/sec * http://127.0.0.1:80/second * @return */
        @Bean
        ServletRegistrationBean getServletRegistrationBean(){ 
            ServletRegistrationBean<SecondServlet> registrationBean = new ServletRegistrationBean<SecondServlet>();
            registrationBean.setServlet(new SecondServlet());
            registrationBean.addUrlMappings("/sec","/second");
    
            return registrationBean;
        }
    
        @Bean
        FilterRegistrationBean getFilterRegistrationBean(){ 
            FilterRegistrationBean<SecondFilter> registrationBean = new FilterRegistrationBean<SecondFilter>();
            registrationBean.setFilter(new SecondFilter());
            registrationBean.addUrlPatterns("/*");
    
            return registrationBean;
        }
    
    
        @Bean
        ServletListenerRegistrationBean getServletListenerRegistrationBean(){ 
            ServletListenerRegistrationBean registrationBean = new ServletListenerRegistrationBean();
            registrationBean.setListener(new MySessionListener());
            return registrationBean;
        }
        // 使用@Bean配合RegistrationBean类型注册 -- end
    
    
        /* 使用Bean注解定义跨域的Filter*/
        @Bean
        FilterRegistrationBean<CorsFilter> cors(){ 
            FilterRegistrationBean<CorsFilter> registrationBean = new FilterRegistrationBean<CorsFilter>();
            CorsConfiguration config = new CorsConfiguration();
    
            config.setAllowCredentials(true);
            config.addAllowedOrigin("*");
            config.addAllowedHeader("*");
            config.addAllowedMethod("*");
    
            UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
            source.registerCorsConfiguration("/**", config);
    
            CorsFilter filter = new CorsFilter(source);
            registrationBean.setFilter(filter);
            registrationBean.addUrlPatterns("/*");
    
            return registrationBean;
        }
    
    	// 另外一种跨域方式
        @Override
        public void addCorsMappings(CorsRegistry registry) { 
            registry.addMapping("/**").allowedHeaders("*").allowedOrigins("*").allowedMethods("*");
        }
    }

### 定义Servlet ###

**SecondServlet：**

package com.keafmd.servlet.component;
    
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.IOException;
    
    /** * Keafmd * * @ClassName: SecondServlet * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-08 17:41 * @Blog: https://keafmd.blog.csdn.net/ */
    public class SecondServlet extends HttpServlet { 
    
        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { 
            System.out.println("SecondServlet.doGet");
            System.out.println("sessionid： "+req.getSession().getId());
        }
    }

### 定义Filter ###

**SecondFilter：**

package com.keafmd.servlet.component;
    
    import javax.servlet.*;
    import java.io.IOException;
    
    /** * Keafmd * * @ClassName: SecondFilter * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-08 17:41 * @Blog: https://keafmd.blog.csdn.net/ */
    public class SecondFilter implements Filter { 
        @Override
        public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { 
            System.out.println("SecondFilter.doFilter 生效了");
            chain.doFilter(request, response);
        }
    }

### 定义Listener ###

package com.keafmd.servlet.component;
    
    import javax.servlet.http.HttpSessionEvent;
    import javax.servlet.http.HttpSessionListener;
    
    /** * Keafmd * * @ClassName: MySessionListener * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-08 17:42 * @Blog: https://keafmd.blog.csdn.net/ */
    public class MySessionListener implements HttpSessionListener { 
    
        @Override
        public void sessionCreated(HttpSessionEvent se) { 
            System.out.println("Session对象被创建");
        }
    
        @Override
        public void sessionDestroyed(HttpSessionEvent se) { 
    
        }
    }

### 使用Bean注解定义跨域的Filter ###

**Appconfig部分代码：**

// 使用Bean注解定义跨域的Filter
    
        @Bean
        FilterRegistrationBean<CorsFilter> cors(){ 
            FilterRegistrationBean<CorsFilter> registrationBean = new FilterRegistrationBean<CorsFilter>();
            CorsConfiguration config = new CorsConfiguration();
    
            config.setAllowCredentials(true);
            config.addAllowedOrigin("*");
            config.addAllowedHeader("*");
            config.addAllowedMethod("*");
    
            UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
            source.registerCorsConfiguration("/**", config);
    
            CorsFilter filter = new CorsFilter(source);
            registrationBean.setFilter(filter);
            registrationBean.addUrlPatterns("/*");
    
            return registrationBean;
        }

### 第二种跨域方式 ###

**Appconfig部分代码：**

@Override
        public void addCorsMappings(CorsRegistry registry) { 
            registry.addMapping("/**").allowedHeaders("*").allowedOrigins("*").allowedMethods("*");
        }

### 效果 ###

**访问：http://127.0.0.1/sec**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 38]  
**访问：http://127.0.0.1/second**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 39]  
**idea控制台输出效果：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 40]

> **以上就是SpringBoot的Web开发支持【超详细【一篇搞定】】的全部内容。**

**看完如果对你有帮助，感谢点赞支持！  
如果你是电脑端的话，看到右下角的 “一键三连” 了吗，没错点它\[哈哈\]**  
![在这里插入图片描述][20210115230629703.gif_pic_center]

**加油！**

**共同努力！**

**Keafmd**

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[SpringBoot_jsp]: https://blog.csdn.net/weixin_43883917/article/details/115400415?spm=1001.2014.3001.5501
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