Android Socket example

안드로이드에서 Socket을 사용하는 예 Part 02

서버측 코드 (Thread를 사용하여 다중접속에 대비한 예)

package com.example.socket.server;

import java.io.*;
import java.net.*;
import java.util.*;

public class ServerForAndroid {
	public static void main(String[] args) {
		ServerSocket serverSocket = null;
		int serverPort = 1234;
		try {
			serverSocket = new ServerSocket(serverPort);
			while(true) {
				System.out.println("접속대기 중......");
				Socket socket = serverSocket.accept();
	    		new ServerThread(socket).start();
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	/* 서버용 쓰레드, 접속요청과 통신부분을 다른 쓰레드로 분리한다 */
	static class ServerThread extends Thread {
		Socket socket;
		ObjectOutputStream objOut;
		ObjectInputStream objInput;
		
		ServerThread(Socket socket) {
			this.socket = socket;
			try{
			    objOut = new ObjectOutputStream(socket.getOutputStream());
	    		    objInput = new ObjectInputStream(socket.getInputStream());
			}catch(Exception ex) {
			    ex.printStackTrace();
			}
		}
		
		public void run() {
			try{
			    String input = (String)objInput.readObject();
	    		    //System.out.println("접속확인됨");
	    		    String response = (input +":"+ new Date());
	    		    objOut.writeObject(response);
	    		    objOut.flush();
			}catch(Exception ex) {
			    ex.printStackTrace();
			}
		}
	}
}

res/layout/main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/linearLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="TextView" />

</LinearLayout>

MainActivity.java (5초마다 서버측에 접속함)

package com.example.androidapp;
import java.io.*;
import java.net.*;

import android.app.*;
import android.content.*;
import android.graphics.*;
import android.os.*;
import android.util.*;
import android.view.*;
import android.view.*;
import android.view.View.*;
import android.widget.*;

public class MainActivity extends Activity {
	
	TextView tv;
	Handler handler = new Handler();
	String response;
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        tv = (TextView) findViewById(R.id.textView1);
        new Thread() {
        	public void run() {
        		while(true) {
        			connect();
        			try {	Thread.sleep(5000);
					} catch (InterruptedException e) { e.printStackTrace();
					}
        		}
        	}
        }.start();
    }

    private void connect() {
    	Socket socket = null;
    	try{
    		socket = new Socket("211.183.3.200", 1234);
    		ObjectOutputStream objOut = new ObjectOutputStream(socket.getOutputStream());
    		objOut.writeObject("time");
    		objOut.flush();
    		
    		ObjectInputStream objInput = new ObjectInputStream(socket.getInputStream());
    		response = (String)objInput.readObject();
    		handler.post(new Runnable() {
				public void run() {
					tv.setText(response);
				}
    		});
    	}catch(Exception ex) {
    		Log.e("소켓접속오류", ex.getMessage());
    	}
    }
}