在尝试 用java对 google 的翻译功能做处理的时候，出现了编码的问题

这个是在java中打印的字符

?     ???E0mWw/@?儳h5?|掲獟?!DF<?@坠?
C#h3癘e嶺?G?X^?oo眉豒嚣?阨?/

此处文字以程序输出为准

以下是实际会返回的字符

[[["Hello","你好","","Nǐ hǎo"]],[["interjection",["hello","hi","hallo"],[["hello",["喂"],[1],0.034756977],["hi",["嗨"],[1],0.0046309186],["hallo",["你好"],,0.00010072414]]],["phrase",["How are you"],[["How are you",["你好"],,0.0020549577]]]],"zh-CN",,[["Hello",[5],0,0,1000,0,1,0]],[["你好",4,,,""],["你好",5,[["Hello",1000,0,0]],[[0,2]],"你好"]],,,[["zh-CN"]],14]

不知道怎么能够将字符转换出来。

附上源码，希望各位解答

package HTTPUtil;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;

import javax.servlet.ServletException;

/**
*
* @author Silver
*
*/
public class HTTPRequest {
public static void main(String[] args) {
try {
HTTPRequest tHTTPRequest = new HTTPRequest();
// String str = tHTTPRequest.HttpRequestGet("http://www.baidu.com", "");
// System.out.println(str);

String str = tHTTPRequest.sendGoogleTrans("你好","zh-CN","en");

} catch (Exception e) {
e.printStackTrace();
}
}


/**
* The HttpRequestGet method . <br>
*
* This method is calling for a http request test
*
* @param uri
* @param querystring
* @throws IOException if an error occurred
*/
public String HttpRequestGet(String uri, String querystring)
throws IOException {

StringBuffer sbstr = new StringBuffer(256);

if (querystring != null && querystring.length() > 0) {
uri = uri + "?" + querystring;
}
URL url = new URL(uri);
URLConnection conn = url.openConnection();
BufferedReader bufferferreader = new BufferedReader(
new InputStreamReader(conn.getInputStream()));
String line;
while ((line = bufferferreader.readLine()) != null) {
sbstr.append(line);
}
bufferferreader.close();
return sbstr.toString();
}
/**
* The sendGoogleTrans method . <br>
*
* This method is calling for a translate test
*
* @param transString the String you want to trans
* @param from <a>GlobalType</a>
* @param to <a>GlobalType</a>
* @throws IOException if an error occurred
*/
public String sendGoogleTrans(String transString,String from,String to) throws IOException
{
String uri = "http://translate.google.cn/translate_a/t?client=t&text="+transString+"&hl=en&sl="+from+"&tl="+to+"&ie=UTF-8&oe=UTF-8&multires=1&otf=1&pc=1&ssel=0&tsel=0&sc=1";
System.out.println(uri);
URL url = new URL(uri);
StringBuffer sbstr = new StringBuffer(256);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");

conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
conn.setAllowUserInteraction(false);

conn.setRequestProperty("Connection", "keep-alive");
conn.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.56 Safari/535.11");
conn.setRequestProperty("Accept", "*/*");
conn.setRequestProperty("Referer", "http://translate.google.cn/?hl=en");
conn.setRequestProperty("Accept-Encoding", "gzip,deflate,sdch");
conn.setRequestProperty("Accept-Language", "zh-CN,zh;q=0.8");
conn.setRequestProperty("Accept-Charset", "GBK,utf-8;q=0.7,*;q=0.3");

File file= new File("D:/1.txt");

BufferedReader bufferferreader = new BufferedReader(
new InputStreamReader(conn.getInputStream()));
String line;
while ((line = bufferferreader.readLine()) != null) {
sbstr.append(line);
}
bufferferreader.close();

String rtn = sbstr.toString();
System.out.println(rtn);
/*Google 返回的编码不知道是什么格式，这里进行处理*/
// String rtndecode1 = java.net.URLDecoder.decode(rtn,"UTF-8");
// System.out.println(rtndecode1);
// String rtndecode2 = new String(rtn.getBytes(rtn),"UTF-8");
// System.out.println(rtndecode2);
// String rtndecode3= java.net.URLDecoder.decode(rtndecode2,"UTF-8");
// System.out.println(rtndecode3);


return rtn;
}

}