最简单的spring mvc开发的Hello World例子
2011-03-31 05:28codeif.com
使用spring的mvc开发,先写个简单Hello world例子,导入想用的jar包,对应位置的代码如下
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="WebApp_ID" version="2.5">
<display-name>webtest</display-name>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/config/applicationContext.xml</param-value>
</context-param>
<servlet>
<servlet-name>dispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/config/applicationContext.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<!-- 拦截所有以do结尾的请求 -->
<servlet-mapping>
<servlet-name>dispatcherServlet</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>helloWorld.do</welcome-file>
</welcome-file-list>
</web-app>
servlet类HelloWorldAction.java
package com.codeif.action;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;
//实现了Controller接口,需要在导入spring.jar包
public class HelloWorldAction implements Controller {
private String helloWorld;
private String viewPage;
public String getHelloWorld() {
return helloWorld;
}
public void setHelloWorld(String helloWorld) {
this.helloWorld = helloWorld;
}
public String getViewPage() {
return viewPage;
}
public void setViewPage(String viewPage) {
this.viewPage = viewPage;
}
// 实现Controller接口中的handleRequest方法
public ModelAndView handleRequest(HttpServletRequest request,
HttpServletResponse response) throws Exception {
// TODO Auto-generated method stub
Map model = new HashMap();
model.put("helloWorld", getHelloWorld());
return new ModelAndView(getViewPage(), model);
}
}
applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<!-- 定义映射 -->
<bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="mappings">
<props>
<prop key="helloWorld.do">helloWorldAction</prop>
</props>
</property>
</bean>
<!-- 定义视图 -->
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass">
<value>org.springframework.web.servlet.view.InternalResourceView</value>
</property>
</bean>
<!-- 定义控制器 -->
<bean id="helloWorldAction" class="com.codeif.action.HelloWorldAction">
<property name="helloWorld">
<value>Good Luck!</value>
</property>
<property name="viewPage">
<value>/index.jsp</value>
</property>
</bean>
</beans>
index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<html>
<head><title>第一个SpringMVC实例</title></head>
<%String str=(String)request.getAttribute("helloWorld"); %>
<body>
<H1><%=str %></H1>
</body>
</html>