표준 자바 코드

 

package org.androidtown.socket;

import java.io.ObjectInputStream;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;
import java.net.ServerSocket;
import java.net.Socket;

//표준 자바에서 소켓 서버
// 소켓 서버 만들기
public class JavaSocketServer {

		public static void main(String[] args) {
				
		int port =5001;
		try{
			
			ServerSocket server=new ServerSocket(port);
			System.out.println("서버시작됨 :" + port);
			
			while(true){
				Socket socket =server.accept();
				
				//클라이언트 -> 서버 로 받은 데이터
				ObjectInputStream instream =new ObjectInputStream(socket.getInputStream());
				Object input=instream.readObject();
				System.out.println("클라이언트로부턴 받은 데이터 : " + input);
				
				
				// 서버 -> 클라이언트로 보내기
				String output =input + " from Server." ;
				ObjectOutputStream outputStream=new ObjectOutputStream(socket.getOutputStream());
				outputStream.writeObject(output);
				outputStream.flush();
				System.out.println("클라이언트로 보낸 데이터 : " + output);
				
				instream.close();
				outputStream.close();
				socket.close();
			}
						
		}catch (Exception e) {
			e.printStackTrace();
		}
		
	}
	
	
}

 

 

class MainActivity

package kr.co.braverokmc.mysocketclient;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;

public class MainActivity extends AppCompatActivity {

    TextView textView;
    EditText editText;

    Handler handler=new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        textView=(TextView)findViewById(R.id.textView2);
        editText=(EditText)findViewById(R.id.edit1);
    }


    public void onClick(View v){

        if(editText.getText().toString().trim().length() < 1){
            Toast.makeText(this, "전송할 문자를 입력하세요.", Toast.LENGTH_SHORT).show();
        }else {
            ConnectThread connectThread =new ConnectThread();
            connectThread.setDaemon(true);
            connectThread.start();
        }

    }

    class ConnectThread extends Thread{

        @Override
        public void run() {
            String host = "192.168.0.2";
            int port = 5001;

            try {


                    Socket socket = new Socket(host, port);
                    println("서버로 연결되었습니다. " + host + ", " + port);

                   	String output =editText.getText().toString();
                    ObjectOutputStream outStream = new ObjectOutputStream(socket.getOutputStream());
                    outStream.writeObject(output);
                    outStream.flush();
                    println("서버로 보낸 데이터 : " + output);


                    ObjectInputStream instream = new ObjectInputStream(socket.getInputStream());
                    Object input = instream.readObject();
                    println("서버로 부터 받은 데이터 " + input);

                    instream.close();
                    outStream.close();
                    socket.close();



            } catch (Exception e) {

                e.printStackTrace();
            }
        }

    }


    private void println(final String data){

        handler.post(new Runnable() {
            @Override
            public void run() {

                textView.append(data +"\n");
            }
        });
    }



}

 

 

R.layout.activity_main

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



    <Button
        android:text="연결하기"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/button"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:onClick="onClick"
        android:background="@android:color/holo_green_light"
        android:textColor="@android:color/background_light" />


    <EditText
        android:hint="전송할 문자"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/edit1" />

    <TextView
        android:layout_marginTop="10dp"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/textView2"
        android:textSize="24sp"
        android:textColor="@android:color/holo_blue_dark" />


</LinearLayout>

 

AndroidMainfest.xml

    <uses-permission android:name="android.permission.INTERNET" />

 

 

 

 

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