springMVC 配置CharacterEncodingFilter之后不起效果

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最近开始自学springMVC框架，遇到中文乱码这一经典问题，记录下解决过程，以便后续忘记

web.xml 里过滤器配置如下：

<?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>springmvc</display-name> 
<filter>
<filter-name>CharacterEncodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>  <servlet>
<servlet-name>example</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> 
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-servlet.xml</param-value>
</init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping>
<servlet-name>example</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping> <welcome-file-list>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>

spring配置文件如下：

<?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:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
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"> <context:component-scan base-package="com.guo.controller"></context:component-scan> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
p:prefix="/WEB-INF/jsp/" p:suffix=".jsp" > 
</bean></beans>

jsp代码如下：

<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body> 欢迎您，${requestScope.username }</body>
</html>

java的controller代码如下：

/*
* 文件名: UserController.java
* 版权: Ltd. Copyright YYYY-YYYY, All rights reserved
* 描述: <描述>
* 修改人: Administrator
* 修改时间: 2016年3月17日
*/
package com.guo.controller;import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;import com.guo.po.User;/**
* <一句话功能简述>
* <功能详细描述>
*
* @author Administrator 2016年3月17日
*/
@Controller
@RequestMapping("/user")
public class UserController
{
// Controller 单例
// http://localhost:8080/springmvc/user/add.do
@RequestMapping("/add")
public void add(User user)
{
System.out.println(user);
} @RequestMapping("/login")
public String login(@RequestParam("n")String userName, @RequestParam("p")String password, ModelMap map)
{
//userName = new String(userName.getBytes("ISO-8859-1"), "UTF-8"); System.out.println("userName is " + userName
+ " and password is " + password); // session.setAttribute
// request.setAttribute map.put("username", userName);// return "forward:/welcome.jsp"; return "admin/adminwelcome";
} @RequestMapping("/login2")
public ModelAndView login2(@RequestParam("n")String userName, @RequestParam("p")String password)
{
System.out.println("userName is " + userName
+ " and password is " + password); ModelAndView mv = new ModelAndView();
mv.setViewName("admin/adminwelcome"); mv.getModelMap().put("username", userName); return mv;
} @RequestMapping("/baidu")
public String baidu()
{
return "redirect:http://www.baidu.com";
} @RequestMapping("{id}/delete")
public void delete(@PathVariable("id")Integer id)
{
System.out.println("delete id is " + id);
}
}