总结JSP,Struts等应用程序中在Tomcat中的乱码问题

一般表单提交有POST,GET方式，不过处理的时候方法有所区别
一般post可以在JSP页面添加<% request.setCharacterEncoding="GBK";%> 来处理
GET方式可以用转换编码方式类似的如：<%String username = new String(username.getBytes("ISO8859_1"),"GBK");%>

不过这不是很好的处理方式，比较麻烦。每个页面都要写这样重复的转换。
POST方式一般可以用Filter过滤的Servlet来实现
创建EncodingFilter.java
=======================
/*
 * CoppyRight (c) Eays Studio
 * description:LoginAction
 */
package net.eays.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.ServletException;
/**
 * @author 小林信仁
 * Creation date: 05-09-2007
 */
public class EncodingFilter implements Filter {

 /**
  * Constructor of the object.
  */
 private FilterConfig config = null;
 private String targetEncoding = "GBK";
 
 public EncodingFilter() {
  super();
 }

 /**
  * Destruction of the servlet. <br>
  */
 public void destroy() {
  config = null;
  targetEncoding = null;
 }

 /**
  * Initialization of the servlet. <br>
  *
  * @throws ServletException if an error occure
  */
 public void init(FilterConfig config) throws ServletException {
  this.config = config;
  this.targetEncoding = config.getInitParameter("encoding");
  System.out.println("init get value:"+ this.targetEncoding );
 }
 
 public void doFilter(ServletRequest request,ServletResponse response,FilterChain chain) throws IOException,ServletException{
  System.out.println("targetEncoding :" + targetEncoding + "/n");
  request.setCharacterEncoding(targetEncoding);
  chain.doFilter(request, response);
 }

}

==============================


Web.xml中EncodingFilter过滤器配置添加
========================
<filter>
  <description>EncodingFilter</description>
  <display-name>EncodingFilter</display-name>
  <filter-name>EncodingFilter</filter-name>
  <filter-class>net.eays.servlet.EncodingFilter</filter-class>
  <init-param>
   <description>encoding to GB2312</description>
   <param-name>encoding</param-name>
   <param-value>GB2312</param-value>
  </init-param>
 </filter>
 <filter-mapping>
  <filter-name>EncodingFilter</filter-name>
  <url-pattern>/*</url-pattern>
 </filter-mapping>
=============================

处理Get方式以上还是不行，Tomcat可以修改server.xml文件
============================
知道 <Connector
最后添加属性 useBodyEncodingForURI="true"
============================

OK,一切的乱码问题通通解决！