P2PNetworkInJava/NetworkEndPoint.java at master · haileykim1/P2PNetworkInJava · GitHub

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import java.net.*;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;


//wan port : 30001
//lan port : 7070

public class NetworkEndPoint {
	//return 형식은 보낸 IP/PORT/DATA

	static String HeeEul = "---.---.---.---";
	static String YeIn = "---.---.---.---";
	static String SoYang = "--.---.---.---";

	static String IP;
	static int snd_port = 30001;
	static int rcv_port = 30001;


	NetworkEndPoint() throws Exception {
		System.out.println("NetworkEndPoint start...");
	}

	NetworkEndPoint(String ip){
		IP = ip;
	}

	private void msg_receive() {

		try {

			while(true) {

				System.out.println("--Receive");
				String s = wan_receive(rcv_port);
				System.out.println(s);
			}
		} catch(Exception e) {
			System.out.println(e.getMessage());
		}
	}

	public void set_IP(String s) {
		IP = s;
	}


	private void msg_send(String str) {

		try {
			System.out.println("--Send");
			wan_send(str,snd_port);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	@SuppressWarnings("finally")
	public static String wan_receive(int port) throws Exception {
			String msg = null;
			ServerSocket serverSocket = null;
			Socket socket = null;
			try {
				serverSocket = new ServerSocket(port);
				socket = serverSocket.accept();
				InputStream in = socket.getInputStream();
				byte arr[] = new byte[100];
				in.read(arr);
				msg = new String(arr);
			} catch (Exception e) {
				System.out.println(e.getMessage());
			}
			finally {
				try {
					socket.close();
					serverSocket.close();
				} catch (Exception e) {

				}
				return msg;
			}


	}

	//byte 형태로 주고 받음
	public static void wan_send(String s, int port) throws Exception {
		Socket socket = null;
		//System.out.println("1");
		try {
			socket = new Socket(IP/*"localhost"*/, port);
			OutputStream out = socket.getOutputStream();
			out.write(s.getBytes());
			System.out.println("Socket : " + socket.getInputStream());

		} catch(Exception e) {
			System.out.println(e.getMessage());
		}
		finally {
			try {
			socket.close();
			} catch (Exception e) {

			}
		}
	}

	@SuppressWarnings("finally")
	public static Object object_receive(int port) throws Exception {
		Object o = null;
		ServerSocket serverSocket = null;
		Socket socket = null;
		ObjectInputStream in = null;
		try {
			serverSocket = new ServerSocket(port);
			socket = serverSocket.accept();
			in = new ObjectInputStream(socket.getInputStream());
			o = in.readObject();
		} catch (Exception e) {
			System.out.println(e.getMessage());
		}
		finally {
			try {
				socket.close();
				serverSocket.close();

			} catch (Exception e) {
			}
			return o;
		}
	}

	public static void object_send(Object o, int port) throws Exception {
		Socket socket = null;
		ObjectOutputStream out = null;
		try {
			socket = new Socket(IP, port);
			out = new ObjectOutputStream(socket.getOutputStream());

			out.writeObject(o);
			System.out.println("Socket : " + socket.getInputStream());

		} catch(Exception e) {
			System.out.println(e.getMessage());
		}
		finally {
			try {
			out.flush();
			socket.close();
			} catch (Exception e) {

			}
		}
	}


	public static void pullFromConsortium() {

	}

	public static void pushToConsortium() {

	}
}