spring mvc 配置使用说明

spring mvc 相对struts2来说开发效率较高，性能来说也较高。

需要重点说明的是Struts2里边可以省略后缀类似http://xxxx.action 可以省略action

但是spring mvc不能省略必须带后缀http://xxx.action

web.xml配置文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="StoreQuery" 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>StoreQuerySpringMVC Application</display-name>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.jsp</welcome-file>
    <welcome-file>index.html</welcome-file>
  </welcome-file-list>
  
<!--   spring监听器 -->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/appContext.xml</param-value>
  </context-param>
  
<!--   spring mvc 拦截器 -->
  <servlet>
        <servlet-name>app</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/spring-mvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>app</servlet-name>
<!--         如果配置成/*则是拦截所有但是5.0版本测试必须加/app/*才可以, 会出现404错误，
				因为返回来的JSP还是会被拦截，就会报错了! -->
<!--         / 也是拦截所有的，但是除了专门配置的静态文件除外-->
<!--         *.do这里我们配置成只拦截后缀为.do的页面 -->
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>
    

</web-app>

spring-mvc.xml配置

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

<!-- 	开启注解配置  扫描com.storequery.action包下的所有类 driven默认加载映射处理器和适配器-->
	<context:component-scan base-package="com.storequery.action"/>	
    <mvc:annotation-driven>
    </mvc:annotation-driven>
    
<!--  JSP视图解析器    给返回页面加上前缀和后缀以匹配正确的路径  -->
    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    	<property name="viewClass" value="org.springframework.web.servlet.view.JstlView">
	    <property name="prefix" value="/WEB-INF/jsp/"/>
    	<property name="suffix" value=".jsp"/>
	</bean>

<!-- 	这里是XML配置 -->
<!-- 	<bean id="urlMapping" -->
<!--         class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"> -->
<!-- 	    <property name="mappings"> -->
<!-- 	        <props> -->
<!-- 				类似Struts2里边的action对应的类 -->
<!-- 	        	<prop key="login.do">loginAction</prop> -->
<!-- 	        </props> -->
<!-- 	    </property> -->
<!-- 	 </bean> -->
	 
<!-- 	 <bean id="loginAction" class="com.storequery.action.LoginAction"> -->
<!-- 	 </bean> -->
    
</beans>

Action类配置

package com.storequery.action;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
//注解
@Controller
@RequestMapping("/loginController.do")  //action多的话可以进行分类  (/log/)
public class LoginAction {
         //同样的这里可以(login) 访问时就是/lon/login.do  
	@RequestMapping(params="method=login")
	public String login(String username, String password) {
		System.out.println("我进来了");
		System.out.println(username);
		return "login/login_success";
	}   //return "redirect:xxx.do"

}
//XML配置
//public class LoginAction implements org.springframework.web.servlet.mvc.Controller {
//
//	@Override
//	public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
//		// TODO Auto-generated method stub
//		System.out.println("我进来了");
//		String username = request.getParameter("username");
//		System.out.println(username);
//		return new ModelAndView("login/login_success");
//	}
//	
//}

重定向 redirect时 rul发生变化，request里设置的数据会清空

forward转发 url不变，request不清空

JSP页面内容

<form action="loginController.do" method="post">  
				<input type="hidden" name="method" value="login">//提交不同的方法时可以用这个
				<div class="login-ic">
					<i ></i>
					<input type="text" name="username"  value="用户" onFocus="this.value = '';" onBlur="if (this.value == '') {this.value = 'User name';}"/>
					<div class="clear"> </div>
				</div>
				<div class="login-ic">
					<i class="icon"></i>
					<input type="password" name="password" value="密码" onFocus="this.value = '';" onBlur="if (this.value == '') {this.value = 'password';}"/>
					<div class="clear"> </div>
				</div>
			
				<div class="log-bwn">
					<input type="submit"  value="Login" >
				</div>
				<br>
				<div id="errorDiv"></div>
				</form>

学到什么再补充