HTTPURLConnection 发送Post数据

 1 byte[] body = new byte[512]; // 需要发送的body数据
 2 URL url = new URL(buildSpiderURL(host));
 3 HttpURLConnection conn = null;
 4 try {
 5     conn = (HttpURLConnection) url.openConnection();
 6     conn.setRequestMethod("POST");
 7     conn.setRequestProperty(key, value); // 设置消息头
 8     conn.setDoOutput(true); // post发送数据时必须设置为true，否则对方无法接收到数据
 9     conn.connect();
10     conn.getOutputStream().write(body);
11     conn.getOutputStream().flush();
12     conn.getOutputStream().close();
13 }catch(Exception ex) {
14     //todo something
15 }finally {
16     conn.disconnect();
17 }