java发送http请求

1、实例化一个IP地址,InetAddress经常和UDP DatagramSockets 和 Socket，ServerSocket 类一起使用
	InetAddress address = InetAddress.getByName("http://www.baidu.com");
		
2、URL和URLConnection

	URL url = new URL("http://www.baidu.com");
	URLConnection urlConnection = url.openConnection();
	//true表示发送post请求
	urlConnection.setDoOutput(true);
	//获取输入输出流
	InputStream input = urlConnection.getInputStream();
	OutputStream output = urlConnection.getOutputStream();

循环发送请求

for (int i = 0; i < 50; i++) {

			if (i % 2 == 0) {
				final int j = i + 1;
				new Thread(new Runnable() {

					@Override
					public void run() {

						try {
							PrintWriter out = null;
							BufferedReader in = null;
							String result = "";
							URL url = new URL(
									"http://10.1.245.176:8443/labelmap/api/labelmap/test/g2PLableStatusUpdate");
							URLConnection conn = url.openConnection();

							// 设置通用的请求属性
							conn.setRequestProperty("accept", "*/*");
							conn.setRequestProperty("connection", "Keep-Alive");
							conn.setRequestProperty("user-agent",
									"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
							// 发送POST请求必须设置如下两行
							conn.setDoOutput(true);
							conn.setDoInput(true);
							// 获取URLConnection对象对应的输出流
							out = new PrintWriter(conn.getOutputStream());
							// 发送请求参数
							out.print("taskId=taskm" + j
									+ "&labelStatus=5&description=过时&token=eyJhbGciOiJIUzUxMiJ9.eyJzdWIiOiJsbWFkbWluIiwic2NvcGVzIjpbIuS4pOe6p-S6kuWKqOeuoeeQhuWRmCJdLCJ1c2VySWQiOiI4YTgxNzUyZjZjODZmMjM2MDE2Yzg5ZDk1MzBlNWFmOSIsImlzcyI6Imh0dHA6Ly9hc2lhaW5mby5jb20iLCJpYXQiOjE1NjcxMzQ3MzIsImV4cCI6MTU2NzE2MzUzMn0.CdrCQwy11cgNN4KLcH0nAFoij2AJk8EKtG0Cdlfz2OnXO2FAVHuIpjBryE4G1f1Ontt4D0f12ZTHqRZfmEEfUw");
							// flush输出流的缓冲
							out.flush();
							// 定义BufferedReader输入流来读取URL的响应
							in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
							String line;
							while ((line = in.readLine()) != null) {
								result += line;
							}
							System.err.println(j + "----" + result);
						} catch (Exception e) {
							e.printStackTrace();
						}

					}
				}).start();
			}
		}