Flex上传文件Java端解决中文乱码问题

public  function encodeStr(str:String, charSet:String):String
            {
                var result:String ="";
                
                var bytes:ByteArray = new ByteArray();
                bytes.writeMultiByte(str, charSet);
                for (var i:uint; i<bytes.length; i++) {
                    result += escape(String.fromCharCode(bytes[i]));
                }
                
                return result;
            }

URLDecoder.decode(trueFileName,"utf-8");