JAVA 中URL链接中文参数乱码的处理方法

JAVA 中URL链接中文参数乱码的若干处理方法，现在整理收录如下:
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");  
方法二：
<%@ 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').