Android 发送http请求实例

           		URL url;			try {				OutputStream os = null;								url = new URL(uri);				HttpURLConnection conn = (HttpURLConnection) url.openConnection();				conn.setDoOutput(true);				conn.setDoInput(true);				conn.setRequestMethod("POST");				conn.setFixedLengthStreamingMode(packetData.length);				conn.setUseCaches(false);												os = conn.getOutputStream();				int offset = 0;				int len = READ_WRITE_SIZE;				while (offset < packetData.length){					if (offset + len > packetData.length){						len = packetData.length - offset;					}					os.write(packetData, offset, len);					os.flush();					offset += len;				}				InputStream fin = null;				fin = conn.getInputStream();				BufferedReader r = new BufferedReader(new InputStreamReader(fin)); 				StringBuilder total = new StringBuilder(); 				String line; 				while ((line = r.readLine()) != null) { 				    total.append(line); 				}				tv.setText("---> "+total);			} catch (MalformedURLException e) {				e.printStackTrace();			} catch (IOException e) {				e.printStackTrace();			}

需要注意的是不能在主线中进行http请求，需要

new Thread(mRun).start();  Runnable mRun = new Runnable(){}