适配器Adapter【Action实现什么接口】
Action实现Controller接口
org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter
目录结构
操作流程
pom.xml
<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.springapp</groupId>
<artifactId>SpringMVC003</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>SpringMVC003</name>
<properties>
<spring.version>3.2.0.RELEASE</spring.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.2</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<finalName>SpringMVC003</finalName>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<includes>
<include>**/*Tests.java</include>
</includes>
</configuration>
</plugin>
</plugins>
</build>
</project>web.xml
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>Spring MVC Application</display-name>
<!--注册SpringMVC的核心控制器-->
<servlet>
<servlet-name>mvc-dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!--通知DispatcherServlet去指定的目录下加载springmvc.xml-->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value >WEB-INF/mvc-dispatcher-servlet.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>mvc-dispatcher</servlet-name>
<url-pattern>*.action</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>mvc-dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>emp.jsp</welcome-file>
</welcome-file-list>
</web-app>mvc-dispatcher-servlet.xml
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<!--控制器Action-->
<bean name="/add.action" class="com.springapp.mvc.EmpAction"></bean>
<!--映射器（BeanNameUrlHandlerMapping表示将bean标签的name属性当做URL请求） 可省略-->
<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"></bean>
<!-- 适配器 SimpleControllerHandlerAdapter表示用于寻找实现了Controller接口的Action类 -->
<bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"></bean>
<!-- 视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/pages/"/>
<property name="suffix" value=".jsp"/>
</bean>
</beans>
emp.jsp
<%@ page language="java" pageEncoding="UTF-8" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>适配器</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/add.action" method="POST">
员工姓名：<input type="text" name="username" />
<input type="submit" value="提交">
</form>
</body>
</html>EmpAction.java
package com.springapp.mvc;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/** * * 控制器是实现Controller接口的类 * Created by liguodong on 2015/11/17. */
public class EmpAction implements Controller {
@Override
public ModelAndView handleRequest(HttpServletRequest request,
HttpServletResponse response)
throws Exception {
//设置编码方式(POST方式)
request.setCharacterEncoding("UTF-8");
//获取员工姓名
String username = request.getParameter("username");
//显示
System.out.println("员工姓名：" + username);
//将员工姓名封装到ModelAndView对象中去
ModelAndView modelAndView = new ModelAndView();
modelAndView.addObject("massage",username);
//封装路径到ModelAndView
modelAndView.setViewName("hello");
//modelAndView.setViewName("/WEB-INF/pages/hello.jsp");
return modelAndView;
}
}
/** * 1、Action类实现Controller类接口，带来了代码耦合 * 2、如果参数过多，实现了Controller接口的Action收集起来不爽 */
hello.jsp
<%@ page language="java" pageEncoding="UTF-8" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<body>
hello.jsp<br/>
成功<br/>
request:${requestScope.massage}<br/>
</body>
</html>运行结果：
原文链接：https://blog.csdn.net/scgaliguodong123_/article/details/49978353
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