解决中文乱码（ jsp表单提交中文时出现乱码）

有三种方法：

1.建立一个filter中文解决乱码

2.Struts2在struts.xml中修改默认的编码设定

3.用Spring解决中文乱码

4.直接在jsp中修改解决

1.建立一个filter解决乱码

1)建立一个filter类src/util/SetCharacterEncodingFilter.java

package util;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.UnavailableException;
     public class SetCharacterEncodingFilter implements Filter {

    public void destroy() {
    }
       public void doFilter(ServletRequest request, ServletResponse response,
    FilterChain chain)throws IOException, ServletException {

    //设置编码

    request.setCharacterEncoding("gb2312");

    // 传递控制到下一个过滤器
    chain.doFilter(request, response);
    }

    public void init(FilterConfig filterConfig) throws ServletException {
    }
}

2.修改web.xml,添加filter和filter-mapping(在struts的FilterDispatcher映射之前添加)

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

     <!--      -->

   <filter>
        <filter-name>Set Character Encoding</filter-name> 
        <filter-class>util.SetCharacterEncodingFilter</filter-class> 
    </filter> 
    <filter-mapping> 
        <filter-name>Set Character Encoding</filter-name>
        <url-pattern>/*</url-pattern> 
    </filter-mapping>
    
    web-app>

2.Struts2在struts.xml中修改默认编码(Struts2_2.16以上)

<struts>
    <constant name="struts.i18n.encoding" value="gbk"></constant>
</struts>

3.用Spring解决中文乱码

修改web.xml,添加filter和filter-mapping(在struts的FilterDispatcher映射之前添加)

<filter>
        <filter-name>encodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>GBK</param-value>
        </init-param>
    </filter>
    
    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

4.直接在jsp中修改解决

<%@ page contentType="text/html; charset=gb2312"%>

<html>
<head>    <title>JSP的中文处理</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<body>
<%

   String s=new String(request.getParameter("name").getBytes("ISO-8859-1"),"gb2312") ;
   out.print(s);
%>
</body>
</html>