ajax提交编码问题

我用jquery ajax传给action一个字符串 希望用pinyin4j处理。pinyin4j貌似只能处理gbk，gb2312。但我的action中只接到了utf-8的。求解

1.怎么才能让action接到gbk编码的字符串

2.或者怎么将接到的字符串转成gbk

pinYin=$.ajax({
                type:'post',
                url:"materials/createPinYin.action",
                async:false,
                contentType: "application/x-www-form-urlencoded; charset=gbk", 
                data: {rcName:name}
            });
action
String str1 = request.getParameter("xxx").getBytes("iso-8859-1"),"utf-8");
//str1打印正确  pinyin4j报错
String str2= new String(str1.getBytes("utf-8"),"gbk");
//str2打印乱码  pinyin4j报错