java乱码怎么处理?

这是我的java代码
public static void main(String[] args) throws IOException{
// TODO Auto-generated method stub
StringBuffer sb = new StringBuffer("http://www.yx601.com/mobile/?mobile=1391632");
URL url = new URL(sb.toString());
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
//     connection.setRequestProperty(arg0, arg1);
BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
String inputline = in.readLine();
inputline=URLDecoder.decode(inputline, "utf-8");

System.out.println(inputline);
}
就这一个方法，是查询手机归属地，但是返回的结果汉字都是乱码，在别人机器上都没乱码，但是我的eclipse编码格式已经给设成utf-8了啊，怎么回事？？？
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我把utf-8改成gb18030咋样呢？
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