SpringMVC入門實例

<?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" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
 <display-name>SpringMVC_HelloWorld</display-name>
 <welcome-file-list>
  <welcome-file>index.html</welcome-file>
  <welcome-file>index.htm</welcome-file>
  <welcome-file>index.jsp</welcome-file>
  <welcome-file>default.html</welcome-file>
  <welcome-file>default.htm</welcome-file>
  <welcome-file>default.jsp</welcome-file>
 </welcome-file-list>
 
 <!-- spring mvc 的servlet -->
 <!-- DispatcherServlet在初始化后會直接在/WEB-INF/下找springmvc-servlet.xml文件,
        servlet-name標簽的參數定義要和XML文件對應 -->
 <servlet>
    <servlet-name>springmvc</servlet-name>
    <servlet-class>
      org.springframework.web.servlet.DispatcherServlet
    </servlet-class>
    <load-on-startup>1</load-on-startup>
 </servlet>
 <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>/</url-pattern>
 </servlet-mapping>
 
 <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
 </context-param>

 <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
 </listener>
</web-app>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
  xmlns:tx="http://www.springframework.org/schema/tx" 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/tx 
           http://www.springframework.org/schema/tx/spring-tx.xsd 
           http://www.springframework.org/schema/aop 
           http://www.springframework.org/schema/aop/spring-aop.xsd
           http://www.springframework.org/schema/context 
            http://www.springframework.org/schema/context/spring-context-3.0.xsd">

  <!-- 自動掃描的包 -->
  <context:component-scan base-package="com.lin.helloworld.controller" />

  <bean id="viewResolver"
    class="org.springframework.web.servlet.view.UrlBasedViewResolver">
    <property name="viewClass"
      value="org.springframework.web.servlet.view.JstlView" />
    <!-- controller 返回的一個邏輯視圖名經過前后綴的處理返回物理視圖 -->
    <property name="prefix" value="/WEB-INF/jsp/" />
    <property name="suffix" value=".jsp" />
  </bean>

</beans>

package com.lin.helloworld.domain;
public class HelloWorld {
	private String data;
	public HelloWorld() {
		super();
	}
	public HelloWorld(String data) {
		super();
		this.data = data;
	}
	public String getData() {
		return data;
	}
	public void setData(String data) {
		this.data = data;
	}
	@Override
	  public String toString() {
		return "HelloWorld [data=" + data + "]";
	}
}

package com.lin.helloworld.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import com.lin.helloworld.domain.HelloWorld;
@Controller
public class HelloWorldController {
	//這里的/hello相當于struts2里的一個action
	//返回一個字符串給視圖
	@RequestMapping("/hello")
	  public ModelAndView sayHello()
	  {
		//modelAndView的構造方法的第一個參數相當于Struts2里的一個result的name
		ModelAndView modelAndView = new ModelAndView("helloworld", "msg", "HelloWorld!!!");
		return modelAndView;
	}
	//返回一個對象給視圖
	//@ModelAttribute("obj")的作用相當于Struts2的action類里面的一個field,
	//用于表單提交的數據放進一個對象里面
	//這里和struts2的區別:
	//struts2處理表單提交的方式是:<input name="obj.data"/> 提交的數據封裝在obj對象的data里面
	//springmvc的方式是:<input name="data"/> 提交的數據封裝在obj對象的data里面,
	//前提是要使用@ModelAttribute注解
	@RequestMapping("/helloObj")
	  public ModelAndView sayHelloWorld(@ModelAttribute("obj") HelloWorld obj)
	  {
		System.out.println(obj.toString());
		ModelAndView modelAndView = new ModelAndView("helloworld", "obj", obj);
		return modelAndView;
	}
}

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>
  <base href="<%=basePath%>" rel="external nofollow" >
  
  <title>My JSP 'helloworld.jsp' starting page</title>
  
  <meta http-equiv="pragma" content="no-cache">
  <meta http-equiv="cache-control" content="no-cache">
  <meta http-equiv="expires" content="0">  
  <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
  <meta http-equiv="description" content="This is my page">
  <!--
  <link rel="stylesheet" type="text/css" href="styles.css" rel="external nofollow" >
  -->

 </head>
 
 <body>
  HelloWorld! This is a spring mvc framework example.<br>
  ${msg}
  <hr/>
  <form action="helloObj" method="post">
    <!-- 這里的表單提交和struts2不同的是name="data"會自動對應上對象的filed -->
    <input type="text" name="data" size="30"/><br/>
    <input type="submit" value="Submit"/>
  </form>
  <hr/>
  ${obj.data}
 </body>
</html>