springMVC笔记整理

- 日理万妓 2022-04-25 09:04 244阅读 0赞

### springMVC简介 ###

### 配置文件方式搭建环境 ###

### 运行过程源码跟踪 ###

### 注解方式搭建环境 ###

### 基本数据类型和对象类型作为参数 ###

### 复杂数参数和restfu风格参数 ###

### 跳转方式 ###

### @ResponseBody ###

### jsp9大内置对象和4个作用域 ###

### 作用域传值的四个方式 ###

### 文件的上传和下载 ###

### 带有头像的注册 ###

### 自定义拦截器 ###

### 练习登录 ###

### springMVC运行原理 ###

### springMVC简介： ###

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 <td style="vertical-align:top;width:426.1pt;"> SpringMVC重要组件： DispatcherServlet:前段控制器，接受所有请求，过滤jsp；【必须进行配置使得xml文件生效】 </td> 
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 <td style="vertical-align:top;width:426.1pt;"> HandlerMapping:解析请求格式，判断希望调用那个方法；【必须进行配置】 </td> 
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 <td style="vertical-align:top;width:426.1pt;"> HandlerAdapter:负责调用具体的方法；【走默认，不必在xml中进行配置】 进行页面跳转 &nbsp; req.getRequestDispatcher("index.jsp").forward(req, resp); </td> 
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 <td style="vertical-align:top;width:426.1pt;"> ViewResovler:视图解析器，解析结果，准备跳转到具体的物理视图。 </td> 
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 <td style="vertical-align:top;width:426.1pt;"> <img alt="" height="540" src="https://img-blog.csdnimg.cn/20190530225642124.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="809"> </td> 
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 <td style="vertical-align:top;width:426.1pt;"> &nbsp; </td> 
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### 使用纯配置文件搭建springMVC环境： ###

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 <td style="vertical-align:top;width:426.1pt;"> Web.xml无法打包的jar包。即使打包到jar包中也无效。Tomcat在加载项目的时候必须到web-info中查找web.xml，其他任何路径无效，jar包中的东西都在隐藏的classes文件中，所以必须自己配置。 
 <ol> 
 <li>导入jar包</li> 
 </ol>&nbsp; <img alt="" height="213" src="https://img-blog.csdnimg.cn/20190530225654865.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="396"> 
 <ol> 
 <li>配置web.xml</li> 
 </ol>&nbsp; <img alt="" height="263" src="https://img-blog.csdnimg.cn/20190530225654905.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="482"> <img alt="" height="29" src="https://img-blog.csdnimg.cn/20190530225654997.png" width="893"> <img alt="" height="37" src="https://img-blog.csdnimg.cn/2019053022565534.png" width="961"> 视图解析器： <img alt="" height="317" src="https://img-blog.csdnimg.cn/2019053022565590.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="495"> &nbsp; &lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" &nbsp;&nbsp;&nbsp; xmlns="http://java.sun.com/xml/ns/javaee" &nbsp;&nbsp;&nbsp; xsi:schemaLocation="http://java.sun.com/xml/ns/javaee &nbsp;&nbsp;&nbsp; http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0"&gt; &nbsp; &lt;display-name&gt;springmvc01&lt;/display-name&gt; &nbsp; &lt;welcome-file-list&gt; &nbsp;&nbsp;&nbsp; &lt;welcome-file&gt;index.html&lt;/welcome-file&gt; &nbsp;&nbsp;&nbsp; &lt;welcome-file&gt;index.htm&lt;/welcome-file&gt; &nbsp;&nbsp;&nbsp; &lt;welcome-file&gt;index.jsp&lt;/welcome-file&gt; &nbsp;&nbsp;&nbsp; &lt;welcome-file&gt;default.html&lt;/welcome-file&gt; &nbsp;&nbsp;&nbsp; &lt;welcome-file&gt;default.htm&lt;/welcome-file&gt; &nbsp;&nbsp;&nbsp; &lt;welcome-file&gt;default.jsp&lt;/welcome-file&gt; &nbsp; &lt;/welcome-file-list&gt; &nbsp; &lt;servlet&gt; &nbsp; &nbsp; &lt;servlet-name&gt;springmvc&lt;/servlet-name&gt; &nbsp; &nbsp; &lt;servlet-class&gt;org.springframework.web.servlet.DispatcherServlet&lt;/servlet-class&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;init-param&gt;&lt;!-- 必须放在startup上边，否则报错 --&gt; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp; &lt;param-name&gt;contextConfigLocation&lt;/param-name&gt; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp; &lt;param-value&gt;classpath:springmvc.xml&lt;/param-value&gt; &nbsp; &nbsp; &lt;/init-param&gt; &nbsp; &nbsp; &nbsp; &nbsp; &lt;load-on-startup&gt;1&lt;/load-on-startup&gt;&lt;!-- 自启动，tomcat在启动时就加载，否则在访问时加载 --&gt; &nbsp; &nbsp; &nbsp; &lt;/servlet&gt; &nbsp; &lt;servlet-mapping&gt; &nbsp; &nbsp; &lt;servlet-name&gt;springmvc&lt;/servlet-name&gt; &nbsp; &nbsp; &lt;url-pattern&gt;/&lt;/url-pattern&gt;&lt;!-- 拦截除了jsp以外，其它所有的请求 --&gt; &nbsp; &lt;/servlet-mapping&gt; &lt;/web-app&gt; &nbsp; &nbsp; </td> 
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 <td style="vertical-align:top;width:426.1pt;"> package com.pshdhx.test; &nbsp; import org.springframework.context.ApplicationContext; import org.springframework.web.servlet.HandlerAdapter; import org.springframework.web.servlet.HandlerMapping; import org.springframework.web.servlet.ViewResolver; &nbsp; public class Test { &nbsp;&nbsp;&nbsp; public static void main(String[] args) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ApplicationContext ac = null;&nbsp;&nbsp; //加载dispatcherServlet就创建了ApplicationContext的接口-ConfigurableApplicationContext的容器。加载xml文件 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; HandlerMapping hm = null;&nbsp;&nbsp; //urlMapping &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; HandlerAdapter ha = null;&nbsp;&nbsp; //走方法中的语句 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ViewResolver rs = null;&nbsp;&nbsp;&nbsp;&nbsp; //走解析路径 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; } } &nbsp; </td> 
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 <td style="vertical-align:top;width:426.1pt;"> package com.pshdhx.controller; &nbsp; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; &nbsp; import org.springframework.web.servlet.ModelAndView; import org.springframework.web.servlet.mvc.Controller; &nbsp; public class DemoController implements Controller { &nbsp; &nbsp;&nbsp;&nbsp; @Override &nbsp;&nbsp;&nbsp; public ModelAndView handleRequest(HttpServletRequest arg0, HttpServletResponse arg1) throws Exception { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; System.out.println("执行了控制器DemoController"); //走默认适配器 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ModelAndView mv = new ModelAndView("main");&nbsp;&nbsp; //走默认视图解析器 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return mv; &nbsp;&nbsp;&nbsp; } &nbsp; } &nbsp; </td> 
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 <td style="vertical-align:top;width:426.1pt;"> &lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;beans xmlns="http://www.springframework.org/schema/beans" &nbsp;&nbsp;&nbsp; xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" &nbsp;&nbsp;&nbsp; xmlns:context="http://www.springframework.org/schema/context" &nbsp;&nbsp;&nbsp; xsi:schemaLocation="http://www.springframework.org/schema/beans &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; http://www.springframework.org/schema/beans/spring-beans.xsd &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; http://www.springframework.org/schema/context &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; http://www.springframework.org/schema/context/spring-context.xsd"&gt; &nbsp;&nbsp;&nbsp; &lt;bean id="demo123" class="com.pshdhx.controller.DemoController"&gt;&lt;/bean&gt; &nbsp;&nbsp;&nbsp; &lt;bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;!-- 源码中是map方法，所以使用property，的map子标签 --&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;property name="urlMap"&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;map&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;!-- 用来解析控制器逻辑名 --&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;entry key="demo" value-ref="demo123"&gt;&lt;/entry&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/map&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/property&gt; &nbsp;&nbsp;&nbsp; &lt;/bean&gt; &nbsp;&nbsp;&nbsp; &lt;bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;property name="prefix" value="/"&gt;&lt;/property&gt;&nbsp;&nbsp;&nbsp; &lt;!-- name为源码中的前缀 --&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;property name="suffix" value=".jsp"&gt;&lt;/property&gt; &lt;!-- name为源码中的后缀，这样就省去了controller ModelAndView跳转路径的全路径或全名 --&gt; &nbsp;&nbsp;&nbsp; &lt;/bean&gt;&nbsp;&nbsp;&nbsp; &lt;/beans&gt; </td> 
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### springMVC运行过程源码跟踪： ###

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 <td style="vertical-align:top;width:426.1pt;"> <img alt="" height="426" src="https://img-blog.csdnimg.cn/20190530225713338.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="457"> </td> 
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 <td style="vertical-align:top;width:426.1pt;"> 父类的父类往上找： &nbsp; <img alt="" height="455" src="https://img-blog.csdnimg.cn/20190530225713458.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="909"> </td> 
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 <td style="vertical-align:top;width:426.1pt;"> WebApplication是spring容器 <img alt="" height="622" src="https://img-blog.csdnimg.cn/20190530225715122.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="1069"> </td> 
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 <td style="vertical-align:top;width:426.1pt;"> <img alt="" height="729" src="https://img-blog.csdnimg.cn/20190530225717726.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="1143"> </td> 
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 <td style="vertical-align:top;width:426.1pt;"> 说明了spring和springmvc是父子容器 &nbsp; Springmvc能够调用spring容器中的方法。 &nbsp; <img alt="" height="384" src="https://img-blog.csdnimg.cn/20190530225715118.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="682"> &nbsp; <img alt="" height="622" src="https://img-blog.csdnimg.cn/20190530225719274.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="1200"> </td> 
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 <td style="vertical-align:top;width:426.1pt;"> 因为service是在spring容器中，所以在controller中允许注入service方法 <img alt="" height="249" src="https://img-blog.csdnimg.cn/20190530225720355.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="887"> 请求方法，放行请求 <img alt="" height="356" src="https://img-blog.csdnimg.cn/20190530225720445.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="1080"> </td> 
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 <td style="vertical-align:top;width:426.1pt;"> <img alt="" height="348" src="https://img-blog.csdnimg.cn/20190530225720446.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="932"> &nbsp; &nbsp; &nbsp; &nbsp; </td> 
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### springMVC注解方式环境搭建： ###

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 <ol> 
 <li>扫描注解</li> 
 <li>用到mvc命名空间，并且注解驱动</li> 
 <li>写控制器类</li> 
 </ol>&nbsp; </td> 
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 <td style="vertical-align:top;width:426.1pt;"> &lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;beans xmlns="http://www.springframework.org/schema/beans" &nbsp;&nbsp;&nbsp; xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" &nbsp;&nbsp;&nbsp; xmlns:context="http://www.springframework.org/schema/context" &nbsp;&nbsp;&nbsp; &nbsp;xmlns:mvc="http://www.springframework.org/schema/mvc" &nbsp;&nbsp;&nbsp; xsi:schemaLocation="http://www.springframework.org/schema/beans &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; http://www.springframework.org/schema/beans/spring-beans.xsd &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; http://www.springframework.org/schema/context &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; http://www.springframework.org/schema/context/spring-context.xsd &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; http://www.springframework.org/schema/mvc &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; http://www.springframework.org/schema/mvc/spring-mvc.xsd"&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;!-- 扫描注解 --&gt; &nbsp;&nbsp;&nbsp; &lt;context:component-scan base-package="com.pshdhx.controller"&gt;&lt;/context:component-scan&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;!-- 注解驱动 --&gt; &nbsp;&nbsp;&nbsp; &lt;mvc:annotation-driven&gt;&lt;/mvc:annotation-driven&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;!-- 静态资源 css js image --&gt; &nbsp;&nbsp;&nbsp; &lt;mvc:resources location="/js/" mapping="/js/**"&gt;&lt;/mvc:resources&gt;&nbsp;&nbsp;&nbsp; &lt;!-- location是左边工作目录下 mapping是浏览器逻辑名字 --&gt; &lt;/beans&gt; </td> 
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 <td style="vertical-align:top;width:426.1pt;"> package com.pshdhx.controller; &nbsp; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; &nbsp; @Controller&nbsp;&nbsp; //把这个类交给容器去管理 public class DemoController { &nbsp;&nbsp;&nbsp; @RequestMapping("demo")&nbsp; //使用注解&nbsp; ==控制器逻辑名 &nbsp;&nbsp;&nbsp; public String demo(){ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; System.out.println("执行demo"); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return "main.jsp"; &nbsp;&nbsp;&nbsp; } } &nbsp; </td> 
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### 基本数据类型和对象类型作为参数： ###

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 <ol> 
 <li>复制的web项目改名修改后也不能运行，得修改.setting，之间建立项目较好</li> 
 <li>在web.xml修改编码</li> 
 </ol>&nbsp; <img alt="" height="114" src="https://img-blog.csdnimg.cn/20190530225900741.png" width="503"> &nbsp; &lt;!-- 字符编码过滤器 --&gt; &nbsp; &nbsp; &lt;filter&gt; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp; &lt;filter-name&gt;encoding&lt;/filter-name&gt; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp; &lt;filter-class&gt;org.springframework.web.filter.CharacterEncodingFilter&lt;/filter-class&gt; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp; &lt;init-param&gt; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;param-name&gt;encoding&lt;/param-name&gt; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;param-value&gt;UTF8&lt;/param-value&gt; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp; &lt;/init-param&gt; &nbsp; &nbsp; &lt;/filter&gt; &nbsp; &nbsp; &lt;filter-mapping&gt; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp; &lt;filter-name&gt;encoding&lt;/filter-name&gt; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp; &lt;url-pattern&gt;/*&lt;/url-pattern&gt; &nbsp; &nbsp; &lt;/filter-mapping&gt; </td> 
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 <td style="vertical-align:top;width:426.1pt;"> <img alt="" height="664" src="https://img-blog.csdnimg.cn/20190530225902744.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="1020"> </td> 
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 <ol> 
 <li>控制传递值</li> 
 </ol>&nbsp; </td> 
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 <td style="vertical-align:top;width:426.1pt;"> package com.pshdhx.controller; &nbsp; import javax.servlet.http.HttpServletRequest; &nbsp; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; &nbsp; @Controller public class DemoController03 { &nbsp;&nbsp;&nbsp; @RequestMapping("demo03") &nbsp;&nbsp;&nbsp; public String controller(String username,int age,HttpServletRequest req){ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; System.out.println("执行demo03"); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; System.out.println(""+username+"***"+age+"通过action的value到控制器方法的参数，控制jsp页面传值到控制器"); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; req.setAttribute("demo03", "测试从java控制器传值到jsp页面"); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return "main.jsp"; &nbsp;&nbsp;&nbsp; } } </td> 
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 <td style="vertical-align:top;width:426.1pt;"> &lt;%@ page language="java" contentType="text/html; charset=UTF-8" &nbsp;&nbsp;&nbsp; pageEncoding="UTF-8"%&gt; &lt;!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"&gt; &lt;html&gt; &lt;head&gt; &lt;meta http-equiv="Content-Type" content="text/html; charset=UTF-8"&gt; &lt;title&gt;Insert title here&lt;/title&gt; &lt;/head&gt; &lt;body&gt; main.jsp ${demo03 } &lt;/body&gt; &lt;/html&gt; </td> 
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 <td style="vertical-align:top;width:426.1pt;"> &lt;%@ page language="java" contentType="text/html; charset=UTF-8" &nbsp;&nbsp;&nbsp; pageEncoding="UTF-8"%&gt; &lt;!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"&gt; &lt;html&gt; &lt;head&gt; &lt;meta http-equiv="Content-Type" content="text/html; charset=UTF-8"&gt; &lt;title&gt;Insert title here&lt;/title&gt; &lt;/head&gt; &lt;body&gt; &nbsp;&nbsp;&nbsp; &lt;form action="demo03" method="post"&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;input type="text" name="username"&gt;&lt;br&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;input type="text" name="age"&gt;&lt;br&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;input type="submit" value="提交"&gt;&lt;br&gt; &nbsp;&nbsp;&nbsp; &lt;/form&gt; &lt;/body&gt; &lt;/html&gt; </td> 
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 <td style="vertical-align:top;width:426.1pt;"> &nbsp; </td> 
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 <td style="vertical-align:top;width:426.1pt;"> 
 <ol> 
 <li>demo默认是单例的single，线程不安全</li> 
 <li><img alt="" height="37" src="https://img-blog.csdnimg.cn/20190530225901973.png" width="1200">使用别名。</li> 
 </ol></td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;width:426.1pt;"> <img alt="" height="160" src="https://img-blog.csdnimg.cn/20190530225902557.png" width="685"> 如果没有参数，报错500，不能正常跳转 但是如果int变为Integer，则能够正常跳转 Int默认值： &nbsp; <img alt="" height="131" src="https://img-blog.csdnimg.cn/20190530225902752.png" width="1200"> &nbsp; </td> 
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 <td style="vertical-align:top;width:426.1pt;"> <img alt="" height="152" src="https://img-blog.csdnimg.cn/20190530225902693.png" width="759"> <img alt="" height="128" src="https://img-blog.csdnimg.cn/2019053022590221.png" width="422"> <img alt="" height="177" src="https://img-blog.csdnimg.cn/20190530225902741.png" width="493"> &nbsp; </td> 
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 <td style="vertical-align:top;width:426.1pt;"> <img alt="" height="365" src="https://img-blog.csdnimg.cn/20190530225902873.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="776"> </td> 
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### 复杂参数和restfu风格参数： ###

### 跳转方式： ###

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 <td style="vertical-align:top;width:426.1pt;"> 
 <ol> 
 <li>默认的方式是请求转发</li> 
 <li>重定向</li> 
 </ol>&nbsp; 添加redirect路径: &nbsp; 添加forward路径： &nbsp; <img alt="" height="162" src="https://img-blog.csdnimg.cn/20190530225945720.png" width="586"> &nbsp; </td> 
 </tr> 
 </tbody> 
</table>

### 自定义视图解析器： ###

<table style="width:568px;"> 
 <tbody> 
 <tr> 
 <td style="vertical-align:top;width:426.1pt;"> <img alt="" height="137" src="https://img-blog.csdnimg.cn/20190530225946881.png" width="1200"> 表示前边的demo中不需要/了 Redirect和forward表示直接跳转到文件，而不是在某个路径下的文件。 </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;width:426.1pt;"> <img alt="" height="311" src="https://img-blog.csdnimg.cn/20190530225948556.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="704"> 不加forward：表示查找demo11的jsp页面 404 加上forward：可以找到demo11的控制器 success <img alt="" height="131" src="https://img-blog.csdnimg.cn/20190530225948547.png" width="956"> <img alt="" height="90" src="https://img-blog.csdnimg.cn/20190530225946741.png" width="857"> &nbsp; </td> 
 </tr> 
 </tbody> 
</table>

### @ResponseBody: ###

<table style="width:568px;"> 
 <tbody> 
 <tr> 
 <td style="vertical-align:top;width:426.1pt;"> <img alt="" height="223" src="https://img-blog.csdnimg.cn/20190530225949306.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="982"> <img alt="" height="245" src="https://img-blog.csdnimg.cn/20190530225949769.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="852"> <img alt="" height="77" src="https://img-blog.csdnimg.cn/20190530225946925.png" width="395"> &nbsp; </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;width:426.1pt;"> <img alt="" height="577" src="https://img-blog.csdnimg.cn/20190530225956916.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="1200"> <img alt="" height="472" src="https://img-blog.csdnimg.cn/20190530225957130.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="1155"> &nbsp; </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;width:426.1pt;"> 加上responseBody后，不管返回值是什么，恒不跳转。在页面输出返回值。 </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;width:426.1pt;"> responseBody以jackson形式底层实现，需要引入上面三个包。 </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;width:426.1pt;"> <img alt="" height="242" src="https://img-blog.csdnimg.cn/2019053022595340.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="979"> 设置响应头contentType的形式。 <img alt="" height="512" src="https://img-blog.csdnimg.cn/20190530225958697.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="822"> </td> 
 </tr> 
 </tbody> 
</table>

### 能力提升-树形菜单的显示-jquery： ###

<table style="width:568px;"> 
 <tbody> 
 <tr> 
 <td style="vertical-align:top;width:426.1pt;"> <img alt="" height="628" src="https://img-blog.csdnimg.cn/20190530225953463.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="507"> 
 <ol> 
 <li>导入jar包</li> 
 <li>配置web.xml</li> 
 </ol> 
 <ol> 
 <li>上下文参数spring</li> 
 <li>监听器：</li> 
 <li>前端控制器servlet</li> 
 <li>字符编码过滤器</li> 
 </ol><img alt="" height="561" src="https://img-blog.csdnimg.cn/20190530225959515.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="1200"> <img alt="" height="119" src="https://img-blog.csdnimg.cn/20190530225952974.png" width="752"> <img alt="" height="117" src="https://img-blog.csdnimg.cn/20190530225950682.png" width="844"> &nbsp; </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;width:426.1pt;"> <img alt="" height="423" src="https://img-blog.csdnimg.cn/20190530230000423.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="1200"> <img alt="" height="189" src="https://img-blog.csdnimg.cn/20190530225957987.png" width="1200"> <img alt="" height="556" src="https://img-blog.csdnimg.cn/20190530230000540.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="1200"> <img alt="" height="251" src="https://img-blog.csdnimg.cn/20190530225957986.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="947"> <img alt="" height="140" src="https://img-blog.csdnimg.cn/20190530225956924.png" width="1196"> </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;width:426.1pt;"> <img alt="" height="667" src="https://img-blog.csdnimg.cn/2019053023000165.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="1200"> &nbsp; </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;width:426.1pt;"> <img alt="" height="159" src="https://img-blog.csdnimg.cn/20190530225956909.png" width="619"> <img alt="" height="121" src="https://img-blog.csdnimg.cn/20190530225954692.png" width="635"> <img alt="" height="149" src="https://img-blog.csdnimg.cn/20190530225957987.png" width="1088"> <img alt="" height="381" src="https://img-blog.csdnimg.cn/20190530225959616.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="1200"> <img alt="" height="144" src="https://img-blog.csdnimg.cn/20190530225954695.png" width="674"> <img alt="" height="367" src="https://img-blog.csdnimg.cn/20190530225958601.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="1002"> <img alt="" height="424" src="https://img-blog.csdnimg.cn/20190530225958694.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="956"> <img alt="" height="177" src="https://img-blog.csdnimg.cn/2019053022595692.png" width="559"> 能打开就打开，打不开就下载 <img alt="" height="363" src="https://img-blog.csdnimg.cn/20190530225959513.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="985"> <img alt="" height="53" src="https://img-blog.csdnimg.cn/20190530225956387.png" width="320"> &nbsp; &nbsp; </td> 
 </tr> 
 </tbody> 
</table>

### Jsp9大内置对象和4个作用域： ###

<table style="width:568px;"> 
 <tbody> 
 <tr> 
 <td style="vertical-align:top;width:426.1pt;"> <img alt="" height="293" src="https://img-blog.csdnimg.cn/20190530230230439.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="1178"> Classpath：被编译到了这里 <img alt="" height="347" src="https://img-blog.csdnimg.cn/20190530230230470.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="699"> <img alt="" height="498" src="https://img-blog.csdnimg.cn/20190530230229675.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="873"><img alt="" height="204" src="https://img-blog.csdnimg.cn/20190530230229305.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="688"><img alt="" height="112" src="https://img-blog.csdnimg.cn/20190530230228790.png" width="701"> &nbsp; </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;width:426.1pt;"> <img alt="" height="498" src="https://img-blog.csdnimg.cn/20190530230230433.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="873"> <img alt="" height="269" src="https://img-blog.csdnimg.cn/20190530230230430.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="790"> <img alt="" height="140" src="https://img-blog.csdnimg.cn/20190530230230437.png" width="679"> &nbsp; </td> 
 </tr> 
 </tbody> 
</table>

### 作用域传值的4个方式； ###

<table style="width:568px;"> 
 <tbody> 
 <tr> 
 <td style="vertical-align:top;width:426.1pt;"> package com.pshdhx.controller; import javax.servlet.ServletContext; /** &nbsp;* 测试内置对象作用域 &nbsp;*/ import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpSession; &nbsp; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; &nbsp; @Controller public class DemoController { &nbsp;&nbsp;&nbsp; @RequestMapping("demo1") &nbsp;&nbsp;&nbsp; public String demo1(HttpServletRequest req,HttpSession sessionParam){ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; //测试request的作用域 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; req.setAttribute("req", "req的值"); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; //测试session和sessionParam &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; HttpSession session = req.getSession(); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; session.setAttribute("session", "session的值"); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; sessionParam.setAttribute("sessionParam", "sessionParam的值"); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; //application 但是直接定义servletcontext的参数不行：是一个接口，不允许实例化和注入。 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ServletContext application = req.getServletContext(); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; application.setAttribute("application", "application的值"); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return "/index.jsp"; &nbsp;&nbsp;&nbsp; } } &nbsp; </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;width:426.1pt;"> &lt;%@ page language="java" contentType="text/html; charset=UTF-8" &nbsp;&nbsp;&nbsp; pageEncoding="UTF-8"%&gt; &lt;!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"&gt; &lt;html&gt; &lt;head&gt; &lt;meta http-equiv="Content-Type" content="text/html; charset=UTF-8"&gt; &lt;title&gt;Insert title here&lt;/title&gt; &lt;/head&gt; &lt;body&gt; request:${requestScope.req }&lt;br&gt; session:${sessionScope.session }&lt;br&gt; sessionParam:${sessionScope.sessionParam }&lt;br&gt; application:${applicationScope.application } &nbsp; &lt;/body&gt; &lt;/html&gt; </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;width:426.1pt;"> &lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0"&gt; &nbsp; &lt;display-name&gt;springmvc01&lt;/display-name&gt; &nbsp; &lt;welcome-file-list&gt; &nbsp;&nbsp;&nbsp; &lt;welcome-file&gt;index.html&lt;/welcome-file&gt; &nbsp;&nbsp;&nbsp; &lt;welcome-file&gt;index.htm&lt;/welcome-file&gt; &nbsp;&nbsp;&nbsp; &lt;welcome-file&gt;index.jsp&lt;/welcome-file&gt; &nbsp;&nbsp;&nbsp; &lt;welcome-file&gt;default.html&lt;/welcome-file&gt; &nbsp;&nbsp;&nbsp; &lt;welcome-file&gt;default.htm&lt;/welcome-file&gt; &nbsp;&nbsp;&nbsp; &lt;welcome-file&gt;default.jsp&lt;/welcome-file&gt; &nbsp; &lt;/welcome-file-list&gt; &nbsp; &lt;!-- 配置前端控制器 --&gt; &nbsp; &lt;servlet&gt; &nbsp;&nbsp;&nbsp; &lt;servlet-name&gt;springmvc&lt;/servlet-name&gt; &nbsp;&nbsp;&nbsp; &lt;servlet-class&gt;org.springframework.web.servlet.DispatcherServlet&lt;/servlet-class&gt; &nbsp;&nbsp;&nbsp; &lt;init-param&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;param-name&gt;contextConfigLocation&lt;/param-name&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;param-value&gt;classpath:springmvc.xml&lt;/param-value&gt; &nbsp;&nbsp;&nbsp; &lt;/init-param&gt; &nbsp;&nbsp;&nbsp; &lt;load-on-startup&gt;1&lt;/load-on-startup&gt; &nbsp; &lt;/servlet&gt; &nbsp; &lt;servlet-mapping&gt; &nbsp;&nbsp;&nbsp; &lt;servlet-name&gt;springmvc&lt;/servlet-name&gt; &nbsp;&nbsp;&nbsp; &lt;url-pattern&gt;/&lt;/url-pattern&gt; &nbsp; &lt;/servlet-mapping&gt; &nbsp; &lt;!-- 字符编码过滤器&nbsp; 启动加载不是访问加载--&gt; &nbsp; &nbsp; &lt;filter&gt; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp; &lt;filter-name&gt;encoding&lt;/filter-name&gt; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp; &lt;filter-class&gt;org.springframework.web.filter.CharacterEncodingFilter&lt;/filter-class&gt; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp; &lt;init-param&gt; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;param-name&gt;encoding&lt;/param-name&gt; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;param-value&gt;UTF8&lt;/param-value&gt; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp; &lt;/init-param&gt; &nbsp; &nbsp; &lt;/filter&gt; &nbsp; &nbsp; &lt;filter-mapping&gt; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp; &lt;filter-name&gt;encoding&lt;/filter-name&gt; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp; &lt;url-pattern&gt;/*&lt;/url-pattern&gt; &nbsp; &nbsp; &lt;/filter-mapping&gt; &lt;/web-app&gt; </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;width:426.1pt;"> &lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;beans xmlns="http://www.springframework.org/schema/beans" &nbsp;&nbsp;&nbsp; xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" &nbsp;&nbsp;&nbsp; xmlns:context="http://www.springframework.org/schema/context" &nbsp;&nbsp;&nbsp; &nbsp;xmlns:mvc="http://www.springframework.org/schema/mvc" &nbsp;&nbsp;&nbsp; xsi:schemaLocation="http://www.springframework.org/schema/beans &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; http://www.springframework.org/schema/beans/spring-beans.xsd &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; http://www.springframework.org/schema/context &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; http://www.springframework.org/schema/context/spring-context.xsd &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; http://www.springframework.org/schema/mvc &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; http://www.springframework.org/schema/mvc/spring-mvc.xsd"&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;!-- 扫描注解 --&gt; &nbsp;&nbsp;&nbsp; &lt;context:component-scan base-package="com.pshdhx.controller"&gt;&lt;/context:component-scan&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;!-- 注解驱动 --&gt; &nbsp;&nbsp;&nbsp; &lt;mvc:annotation-driven&gt;&lt;/mvc:annotation-driven&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;!-- 静态资源 css js image --&gt; &nbsp;&nbsp;&nbsp; &lt;mvc:resources location="/js/" mapping="/js/**"&gt;&lt;/mvc:resources&gt;&nbsp;&nbsp;&nbsp; &lt;!-- location是左边工作目录下 mapping是浏览器逻辑名字 --&gt; &lt;/beans&gt; </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;width:426.1pt;"> <img alt="" height="225" src="https://img-blog.csdnimg.cn/20190530230233978.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="753"> </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;width:426.1pt;"> <img alt="" height="142" src="https://img-blog.csdnimg.cn/20190530230233982.png" width="745"> </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;width:426.1pt;"> <img alt="" height="122" src="https://img-blog.csdnimg.cn/2019053023023248.png" width="420"> </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;width:426.1pt;"> <img alt="" height="195" src="https://img-blog.csdnimg.cn/2019053023023564.png" width="708"> </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;width:426.1pt;"> <img alt="" height="66" src="https://img-blog.csdnimg.cn/2019053023023262.png" width="594"> <img alt="" height="202" src="https://img-blog.csdnimg.cn/20190530230233982.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="826"> &nbsp; </td> 
 </tr> 
 </tbody> 
</table>

### 文件下载： ###

<table style="width:568px;"> 
 <tbody> 
 <tr> 
 <td style="vertical-align:top;width:426.1pt;"> <img alt="" height="54" src="https://img-blog.csdnimg.cn/2019053023023259.png" width="502"> </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;width:426.1pt;"> 若果是rar的话，直接下载，但是txt是直接打开。 </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;width:426.1pt;"> <img alt="" height="383" src="https://img-blog.csdnimg.cn/20190530230236311.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="722"> <img alt="" height="37" src="https://img-blog.csdnimg.cn/2019053023023255.png" width="508"> <img alt="" height="76" src="https://img-blog.csdnimg.cn/20190530230232191.png" width="736"> <img alt="" height="377" src="https://img-blog.csdnimg.cn/20190530230237635.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="1200"> <img alt="" height="302" src="https://img-blog.csdnimg.cn/20190530230236964.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="983"> </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;width:426.1pt;"> &nbsp; </td> 
 </tr> 
 </tbody> 
</table>

### 文件上传： ###

<table style="width:568px;"> 
 <tbody> 
 <tr> 
 <td style="vertical-align:top;width:426.1pt;"> <img alt="" height="44" src="https://img-blog.csdnimg.cn/20190530230232650.png" width="645"> <img alt="" height="165" src="https://img-blog.csdnimg.cn/20190530230236504.png" width="641"> &nbsp; <img alt="" height="199" src="https://img-blog.csdnimg.cn/20190530230236508.png" width="721"> <img alt="" height="52" src="https://img-blog.csdnimg.cn/20190530230235418.png" width="591"> <img alt="" height="43" src="https://img-blog.csdnimg.cn/20190530230235385.png" width="587"> <img alt="" height="124" src="https://img-blog.csdnimg.cn/20190530230236514.png" width="945"> <img alt="" height="76" src="https://img-blog.csdnimg.cn/20190530230236503.png" width="1200"> <img alt="" height="377" src="https://img-blog.csdnimg.cn/20190530230237733.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="1200"> <img alt="" height="132" src="https://img-blog.csdnimg.cn/20190530230236965.png" width="1103"> <img alt="" height="284" src="https://img-blog.csdnimg.cn/20190530230237636.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="1200"> <img alt="" height="428" src="https://img-blog.csdnimg.cn/20190530230237662.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA==,size_16,color_FFFFFF,t_70" width="1200"> &nbsp; &nbsp; &nbsp; </td> 
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 <td style="vertical-align:top;width:426.1pt;"> package com.pshdhx.controller; &nbsp; import java.io.File; import java.io.IOException; import java.util.UUID; &nbsp; import org.apache.commons.io.FileUtils; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.multipart.MultipartFile; &nbsp; /** &nbsp;* 测试文件上传需要引入commoms-fileload和commons-io两个jar包 &nbsp;* 并且form标签中要 ：enctype="multipart/form-data" type="file" &nbsp;* @author Administrator &nbsp;* &nbsp;*/ @Controller public class DemoController { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; @RequestMapping("upload") &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; public String upload(MultipartFile file,String name) throws IOException{ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; String fileName = file.getOriginalFilename(); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; String suffix = fileName.substring(fileName.lastIndexOf(".")); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; //判断上传文件类型 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if(suffix.equalsIgnoreCase(".png")){ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; String uuid = UUID.randomUUID().toString(); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; FileUtils.copyInputStreamToFile(file.getInputStream(), new File("E:/"+uuid+suffix)); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return "/index.jsp"; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }else{ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return "error.jsp"; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } } &nbsp; </td> 
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 <tr> 
 <td style="vertical-align:top;width:426.1pt;"> &lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;beans xmlns="http://www.springframework.org/schema/beans" &nbsp;&nbsp;&nbsp; xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" &nbsp;&nbsp;&nbsp; xmlns:context="http://www.springframework.org/schema/context" &nbsp;&nbsp;&nbsp; &nbsp;xmlns:mvc="http://www.springframework.org/schema/mvc" &nbsp;&nbsp;&nbsp; xsi:schemaLocation="http://www.springframework.org/schema/beans &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; http://www.springframework.org/schema/beans/spring-beans.xsd &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; http://www.springframework.org/schema/context &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; http://www.springframework.org/schema/context/spring-context.xsd &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; http://www.springframework.org/schema/mvc &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; http://www.springframework.org/schema/mvc/spring-mvc.xsd"&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;!-- 扫描注解 --&gt; &nbsp;&nbsp;&nbsp; &lt;context:component-scan base-package="com.pshdhx.controller"&gt;&lt;/context:component-scan&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;!-- 注解驱动 --&gt; &nbsp;&nbsp;&nbsp; &lt;mvc:annotation-driven&gt;&lt;/mvc:annotation-driven&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;!-- 静态资源 css js image --&gt; &nbsp;&nbsp;&nbsp; &lt;mvc:resources location="/js/" mapping="/js/**"&gt;&lt;/mvc:resources&gt;&nbsp;&nbsp; &lt;!-- location是左边工作目录下 mapping是浏览器逻辑名字 --&gt; &nbsp;&nbsp;&nbsp; &lt;mvc:resources location="/file/" mapping="/file/**"&gt;&lt;/mvc:resources&gt; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &lt;!-- MultipartResovler解析器 --&gt; &nbsp;&nbsp;&nbsp; &lt;bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;property name="maxUploadSize" value="50"&gt;&lt;/property&gt; &nbsp;&nbsp;&nbsp; &lt;/bean&gt; &nbsp;&nbsp;&nbsp; &lt;!-- 异常解析器 --&gt; &nbsp;&nbsp;&nbsp; &lt;bean id="exceptionResolver" class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver"&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;property name="exceptionMappings"&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;props&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;prop key="org.springframework.web.multipart.MaxUploadSizeExceededException"&gt;/error.jsp&lt;/prop&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/props&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/property&gt; &nbsp;&nbsp;&nbsp; &lt;/bean&gt; &lt;/beans&gt; </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;width:426.1pt;"> &lt;%@ page language="java" contentType="text/html; charset=UTF-8" &nbsp;&nbsp;&nbsp; pageEncoding="UTF-8"%&gt; &lt;!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"&gt; &lt;html&gt; &lt;head&gt; &lt;meta http-equiv="Content-Type" content="text/html; charset=UTF-8"&gt; &lt;title&gt;Insert title here&lt;/title&gt; &lt;/head&gt; &lt;body&gt; &lt;form action="upload" enctype="multipart/form-data" method="post"&gt; &nbsp;&nbsp;&nbsp; 姓名：&lt;input type="text" name="name"&gt;&lt;br&gt; &nbsp;&nbsp;&nbsp; 文件：&lt;input type="file" name="file"&gt;&lt;br&gt; &nbsp;&nbsp;&nbsp; &lt;input type="submit" value="上传"&gt; &lt;/form&gt; &lt;/body&gt; &lt;/html&gt; </td> 
 </tr> 
 </tbody> 
</table>

### 能力提升-带有头像的注册： ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA_size_16_color_FFFFFF_t_70][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA_size_16_color_FFFFFF_t_70 1][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA_size_16_color_FFFFFF_t_70 2][]

### 能力提升-下载： ###

### 自定义拦截器： ###

### 拦截器栈： ###

### 练习-登录验证： ###

### Spingmvc运行原理： ###

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA_size_16_color_FFFFFF_t_70]: /images/20220125/442013dd67e54e5aa6dbd6e7ed223918.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BzaGRoeA_size_16_color_FFFFFF_t_70 1]: /images/20220125/aa5b0e9c9e6540c0b1955734a18730e0.png
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