解决HttpUrlConnection乱码问题

 URL httpurl;
  String str = "username=中国";
  String url = "http://127.0.0.1:8080/login.do";
  try {
   str = URLEncoder.encode(str, "utf-8");
   // 如有中文一定要加上，在接收方用相应字符转码即可
  } catch (UnsupportedEncodingException e1) {
   // TODO Auto-generated catch block
   e1.printStackTrace();
  } 
  HttpURLConnection httpurlconnection = null;
  try {
   httpurl = new URL(url + str);
   httpurlconnection = (HttpURLConnection) httpurl.openConnection();
   httpurlconnection.setDoOutput(true);
   httpurlconnection.setRequestMethod("POST");
   httpurlconnection.setRequestProperty("Content-type", "text/html");
   httpurlconnection.setRequestProperty("Accept-Charset", "utf-8");
   httpurlconnection.setRequestProperty("contentType", "utf-8");
   if (httpurlconnection.getResponseCode() == httpurlconnection.HTTP_OK) {
   }

  } catch (Exception e) {
   e.printStackTrace();
  } finally {
   if (httpurlconnection != null) {
    httpurlconnection.disconnect();
   }
  }

通过网络获取数据时出现的乱码：

String path = "http://。。。";// 实验环境中使用pc的ip，不能用localhost或127.0.0.1
		URL url = new URL(path);
		HttpURLConnection conn = (HttpURLConnection) url.openConnection();
//		conn.setRequestProperty("Accept-Charset", "GBK");
		conn.setRequestProperty("contentType", "GBK");
		conn.setConnectTimeout(5 * 1000);
		conn.setRequestMethod("GET");
		InputStream inStream = conn.getInputStream();
//		readLesoSysXML(inStream);
		
		BufferedReader in = new BufferedReader(new InputStreamReader(inStream, "GBK"));
	    StringBuffer buffer = new StringBuffer();
	    String line = "";
	    while ((line = in.readLine()) != null){
	      buffer.append(line);
	    }
	   String str = buffer.toString();

完满解决！！！