方法一：

            http://xxx.do?ptname='我是中国人'
            String strPtname = request.getParameter("ptname");
            strPtname = new String(strPtname.getBytes("ISO-8859-1"), "UTF-8");  

            

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

            

<a href="ds.jsp?url=<%=java.net.URLEncoder.encode("编码的是这里","GB2312")%>">点击这里</a>

            

            <%
            //request.setCharacterEncoding("GBK");
            if(request.getParameter("url")!=null)
            {

            

str=request.getParameter("url");
            str=java.net.URLDecoder.decode(str,"GB2312");
            str=new String(str.getBytes("ISO-8859-1"));
            out.print(str);
            }

            

%>

            

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

            

public String chinatoString(String str)
                  {
                   String s=str;
                   try
                   {
                    byte tempB[]=s.getBytes("ISO-8859-1");
                    s=new String(tempB);
                    return s;
                   }
                   catch(Exception e)
                   {
                    return s;
                   }
                 }

            

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

            

function URLencode(sStr)
                 {
                   return escape(sStr).
                            replace(/"+/g, '%2B').
                               replace(/""/g,'%22').
                                  replace(/"'/g, '%27').
                                    replace(/"//g,'%2F');
                 }

            

            方法三：

            如果用jstl的话，可以自己写一个el的function，调用URLEncoder.encode来编码。

            

IE缺省对URL后面的参数是不编码发送的，但是tomat缺省是按ISO8859-1来进行URL解码，因此才会出现上述错误。好的做法是：
            1、在URL参数中确保用UTF-8编码之，方法可以用js函数encodeURI()，或调用自定义的el function；
            2、设置server.xml中的Connector熟悉URIEncoding="UTF-8"，确保解码格式与编码格式统一；

            

<script>
            for(var i=0;i<document.links.length;i++){
            document.links[i].href=encodeURI(document.links[i].href);
            }
            </script>
            在action中，String s=request.getParameter("s");
            s=new String(s.getBytes("iso-8859-1"),"gbk");