java Socket绑定网卡

public class App {
  public static void main(String[] args) throws InterruptedException, IOException, ParseException {
    Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();
    while (networkInterfaces.hasMoreElements()){
        NetworkInterface networkInterface = networkInterfaces.nextElement();
        System.out.println(networkInterface.getIndex() + ":" + networkInterface.getDisplayName());
    }

    NetworkInterface nif = NetworkInterface.getByIndex(2);
    Enumeration<InetAddress> nifAddresses = nif.getInetAddresses();

    System.out.println(nifAddresses.nextElement().getHostName());
    Socket socket = new Socket();
    socket.bind(new InetSocketAddress(nifAddresses.nextElement().getHostName(), 0));
    socket.connect(new InetSocketAddress("www.baidu.com", 80), 1000);
    String request = "GET /index.html HTTP/1.1\r\n"+
            "Host: www.baidu.com:80\r\n";
    PrintWriter pWriter = new PrintWriter(socket.getOutputStream(),true);
    pWriter.println(request);

    String tem;
    // 这里要注意二进制字节流转换为字符流编码要使用UTF-8
    BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(socket.getInputStream(), "utf-8"));
    while((tem = bufferedReader.readLine()) != null) {
        System.out.println(tem);
    }

    socket.close();
    }

}