转码：
a.href="./showCont.jsp?tcontent="+encodeURI(encodeURI(tcontent));
解码：
java.net.URLDecoder.decode((String)request.getParameter("tcontent"), "UTF-8");
例
a.jsp源代码
<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head>
<body>
<%
String str_test = "华工";
%>
<form method=post action="b.jsp?test=<%=java.net.URLEncoder.encode(str_test) %>">
<input type="submit" value="Submit" name="提交">
</form>
</body>
</html>
b.jsp源代码
<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head>
<body>
<%
String str = new String(request.getParameter("test").getBytes("ISO8859_1"));
%>
<BR>
<%=str %>
</body>