SpringMVC之HelloWorld---Eclipse

我不是女神ヾ 2023-05-30 08:44 26阅读 0赞

# 工程演示 #

1、新建动态Web工程，并且在WebContext/WEB-INF/lib目录下加入 jar 包  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70]

spring-aop-4.0.0.RELEASE.jar
    spring-beans-4.0.0.RELEASE.jar
    spring-context-4.0.0.RELEASE.jar
    spring-core-4.0.0.RELEASE.jar
    spring-expression-4.0.0.RELEASE.jar
    commons-logging-1.1.3.jar
    spring-web-4.0.0.RELEASE.jar
    spring-webmvc-4.0.0.RELEASE.jar

2、在Web.xml中配置\*\*前端控制器\*\*DispatcherServlet  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70 1]

3、加入SpringMVC的配置文件：springmvc.xml

*  在src目录下创建一个spring bean configuration file文件，名字叫做springmvc.xml。并且增加名称空间  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70 2]
 *  修改springmvc,xml，增加配置，此处配置**视图解析器**

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70 3]  
视图解析器通过controller的返回值之后，解析为实际的物理视图，然后转发

4、编写处理请求处理器

*  在src目录下创建com.atguigu.springmvc.helloworld包，并创建一个叫做SpringMVCHandler的类  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70 4]

5、浏览器发送请求，请求处理器中处理请求

*  在webContext目录下创建一个入口页面，index.jsp  
    ![在这里插入图片描述][20191108144103502.png]

7、部署测试  
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# HelloWorld深度解析 #

## HelloWorld请求流程图解 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70 6]

*  处理请求方式有哪几种

public enum RequestMethod {
        
    GET, HEAD, POST, PUT, PATCH, DELETE, OPTIONS, TRACE
    }

*  @RequestMapping可以应用在什么地方  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70 7]

## 流程分析 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70 8]

*  ①客户端请求提交到DispatcherServlet
 *  ②由DispatcherServlet控制器查询一个或多个HandlerMapping，找到处理请求的Controller
 *  ③DispatcherServlet将请求提交到Controller（也称为Handler）
 *  ④Controller调用业务逻辑处理后，返回ModelAndView
 *  ⑤DispatcherServlet查询一个或多个ViewResoler视图解析器，找到ModelAndView指定的视图
 *  ⑥视图负责将结果显示到客户端

# 总结 #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70 9]  
![在这里插入图片描述][20191108150646760.png]

备注：maven地址

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
      <modelVersion>4.0.0</modelVersion>
      <groupId>com.oceanstar</groupId>
      <artifactId>HelloSpringMVC</artifactId>
      <version>0.0.1-SNAPSHOT</version>
      <packaging>war</packaging>
      
      
       <properties>
    	  <atguigu.spring.version>4.0.0.RELEASE</atguigu.spring.version>
       </properties>
      
      <dependencies>
    	  	
    		<dependency>
    		    <groupId>org.springframework</groupId>
    		    <artifactId>spring-aop</artifactId>
    		    <version>${atguigu.spring.version}</version>
    		</dependency>
    		<dependency>
    		    <groupId>org.springframework</groupId>
    		    <artifactId>spring-beans</artifactId>
    		    <version>${atguigu.spring.version}</version>
    		</dependency>
    			<dependency>
    		    <groupId>org.springframework</groupId>
    		    <artifactId>spring-context</artifactId>
    		    <version>${atguigu.spring.version}</version>
    		</dependency>
    		<dependency>
    		    <groupId>org.springframework</groupId>
    		    <artifactId>spring-core</artifactId>
    		    <version>${atguigu.spring.version}</version>
    		</dependency>
    		<dependency>
    		    <groupId>org.springframework</groupId>
    		    <artifactId>spring-expression</artifactId>
    		    <version>${atguigu.spring.version}</version>
    		</dependency>
    		<dependency>
    		    <groupId>org.springframework</groupId>
    		    <artifactId>spring-web</artifactId>
    		    <version>${atguigu.spring.version}</version>
    		</dependency>
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-webmvc</artifactId>
    			<version>${atguigu.spring.version}</version>
    		</dependency>
    		
    		<dependency>
    		    <groupId>commons-logging</groupId>
    		    <artifactId>commons-logging</artifactId>
    		    <version>1.1.3</version>
    		</dependency>
      </dependencies>
    </project>

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