JSP 乱码 - Java / Eclipse

<a href="result.jsp?page=<%=intPage+1%>&searchKey=<%=key%>">下一页</a>

当点击下一页之后：
转到：
key=new String(request.getParameter("searchKey").getBytes("ISO-8859-1"),"UTF-8");
得到的key是乱码
奇怪的是如果key值是一个词语，也就是两个字，不会有乱码，
但是如果key是一个中国字的话，就会出现乱码，也就是一个框框啦，不管我用System.out.println(new String(key.getBytes("ISO-8859-1"),"gb2312")); 
System.out.println(new String(key.getBytes("UTF8"),"gb2312")); 
System.out.println(new String(key.getBytes("GB2312"),"gb2312")); 
System.out.println(new String(key.getBytes("GBK"),"gb2312")); 
System.out.println(new String(key.getBytes("BIG5"),"gb2312")); 
System.out.println(new String(key.getBytes("ISO-8859-1"),"UTF-8")); 
System.out.println(new String(key.getBytes("UTF8"),"UTF-8")); 
System.out.println(new String(key.getBytes("GB2312"),"UTF-8")); 
System.out.println(new String(key.getBytes("GBK"),"UTF-8")); 
System.out.println(new String(key.getBytes("BIG5"),"UTF-8")); 
都打印不出原来的那一个字
用的是Eclipse+tomcat

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把你的URL编码

按楼上的也行