今天在写练习的时候，传值乱码让我很头疼。今天就做个笔记，记录乱码的解决办法。

1.在jsp的头部配置

<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="UTF-8"%>

2.在action层

request.setCharacterEncoding("UTF-8");
 response.setCharacterEncoding("UTF-8");

3.jqueryeasyui传值时出现乱码,就要解碼

如我傳的值是userName

$("#loains").datagrid( {
        width :myWidth,
        height : myHeight,
'login.do?action=UserList&userName='+encodeURIComponent(userName)';

action取值：

String userName= urlDecoder.decode(request.getParameter("userName"), "UTF-8");

或者：String userName= new String(request.getParameter("userName").getBytes("ISO8859-1"), "UTF-8");

4.配置过滤器

web.xml里面

<filter>
  <filter-name>encodeFilter</filter-name>
  <filter-class>com.wow.util.EncodeFilter</filter-class>
  <init-param>
   <param-name>encode</param-name>
   <param-value>UTF-8</param-value>
  </init-param>
 </filter>

<filter-mapping>
  <filter-name>encodeFilter</filter-name>
  <url-pattern>/*</url-pattern>
 </filter-mapping>

在com.wow.util.EncodeFilter类里面

package com.wow.util;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

import org.apache.log4j.Logger;

public class EncodeFilter implements Filter {
    private String encode = "UTF-8";

public void init(FilterConfig config) {
        this.encode = config.getInitParameter("encode");
    }

public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) {
        try {
            request.setCharacterEncoding(this.encode);
            response.setCharacterEncoding(this.encode);
            chain.doFilter(request, response);
        } catch (Exception e) {
            if (!(e instanceof java.net.SocketException)) {
                if (request instanceof HttpServletRequest) {
                    Logger.getLogger(this.getClass()).error(
                            "error request uri:"
                                    + ((HttpServletRequest) request)
                                            .getRequestURI());
                }
                Logger.getLogger(this.getClass()).error(e);
            }
            e.printStackTrace();
        }
    }

public void destroy() {
    }

}