1.socket的TCP通信

客户端：

import java.io.FileInputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;

public class TCPClient {
	public static void main(String[] args) {
		try {
			//创建一个Socket对象，指定服务器端的IP地址和端口号
			Socket socket = new Socket("192.168.1.104",4567);
			//使用InputStream读取硬盘上的文件
			InputStream inputStream = new FileInputStream("f://file/words.txt");
			//从Socket当中得到OutputStream
			OutputStream outputStream = socket.getOutputStream();
			byte buffer [] = new byte[4*1024];
			int temp = 0 ;
			//将InputStream当中的数据取出，并写入到OutputStream当中
			while((temp = inputStream.read(buffer)) != -1){
				outputStream.write(buffer, 0, temp);
			}
			outputStream.flush();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

 服务器端：

import java.io.IOException;
import java.io.InputStream;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.ServerSocket;
import java.net.Socket;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class SocketActivity extends Activity {
    /** Called when the activity is first created. */
	private Button startButton = null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        startButton = (Button)findViewById(R.id.startListener);
        startButton.setOnClickListener(new StartSocketListener());
    }
    
    class StartSocketListener implements OnClickListener{

		@Override
		public void onClick(View v) {
			new ServerThread().start();
		}
    	
    }
    
    class ServerThread extends Thread{
    	public void run(){
    		//声明一个ServerSocket对象
    		ServerSocket serverSocket = null;
    		try {
    			//创建一个ServerSocket对象，并让这个Socket在4567端口监听
				serverSocket = new ServerSocket(4567);
				//调用ServerSocket的accept()方法，接受客户端所发送的请求
				Socket socket = serverSocket.accept();//accept是个阻塞方法,不用担心nullException
				//从Socket当中得到InputStream对象
				InputStream inputStream = socket.getInputStream();
				byte buffer [] = new byte[1024*4];
				int temp = 0;
				//从InputStream当中读取客户端所发送的数据
				while((temp = inputStream.read(buffer)) != -1){
					System.out.println(new String(buffer,0,temp));
				}
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			finally{
				try {
					serverSocket.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		
    	}
    }
}

 2.socket的UDP通信

客户端 ：

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

public class UDPClient {
	public static void main(String[] args) {
		try {
			//首先创建一个DatagramSocket对象
			DatagramSocket socket = new DatagramSocket(4567);
			//创建一个InetAddree
			InetAddress serverAddress = InetAddress.getByName("192.168.1.104");
			String str = "hello";
			byte data [] = str.getBytes();
			//创建一个DatagramPacket对象，并指定要讲这个数据包发送到网络当中的哪个地址，以及端口号
			DatagramPacket packet = new DatagramPacket(data,data.length,serverAddress,4567);
			//调用socket对象的send方法，发送数据
			socket.send(packet);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

 服务器端：

import java.io.IOException;
import java.io.InputStream;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.ServerSocket;
import java.net.Socket;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class SocketActivity extends Activity {
    /** Called when the activity is first created. */
	private Button startButton = null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        startButton = (Button)findViewById(R.id.startListener);
        startButton.setOnClickListener(new StartSocketListener());
    }
    
    class StartSocketListener implements OnClickListener{

		@Override
		public void onClick(View v) {
			new ServerThread().start();
		}
    	
    }
    
    class ServerThread extends Thread{
    
    	public void run(){
    		try {
    			//创建一个DatagramSocket对象，并指定监听的端口号
				DatagramSocket socket = new DatagramSocket(4567);
				byte data [] = new byte[1024];
				//创建一个空的DatagramPacket对象
				DatagramPacket packet = new DatagramPacket(data,data.length);
				//使用receive方法接收客户端所发送的数据
				socket.receive(packet);//这也是个阻塞方法
				String result = new String(packet.getData(),packet.getOffset(),packet.getLength());
				System.out.println("result--->" + result);
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
    	}
    }
}