接着上一篇,这篇加入多线程的功能,使Socket可以持续连接

服务端 

定义一个线程类

 

public class ServerThread implements Runnable {
	// 定义当前线程所处理的Socket
	Socket s = null;
	// 该线程所处理的Socket所对应的输入流
	BufferedReader br = null;

	public ServerThread(Socket s) throws IOException {
		this.s = s;
		// 初始化该Socket对应的输入流
		br = new BufferedReader(new InputStreamReader(s.getInputStream(),
				"uft-8"));
	}

	@Override
	public void run() {
		try
		{
			String content = null;
		    //采用循环不断从Socket中读取客户端发送过来的数据
			while((content = readFromClient()) != null)
			{
				//遍历socketList中的每个socket
				//将读到的内容向每一个socket发送一次
				for(Socket s : MyServer.socketList)
				{
					OutputStream os = s.getOutputStream();
					os.write((content + "\n").getBytes("utf-8"));
				}
			}
		}
		catch(IOException e)
		{
			e.printStackTrace();
		}
	}

	//定义读取客户端数据的方法
	private String readFromClient() {
		try
		{
			return br.readLine();
		}
		//如果捕捉到异常,表明该Socket对应的客户端已经关闭
		catch(IOException e)
		{
			//删除该Socket
			MyServer.socketList.remove(s);
		}
		return null;
	}
}

服务端调用线程类

 

 

public class MyServer {
	// 定义保存所有Socket的ArrayList
	public static ArrayList<Socket> socketList = new ArrayList<Socket>();
	public static void main(String[] args) throws IOException
	{
		ServerSocket ss = new ServerSocket(34567);
		while(true)
		{
			//此行代码会阻塞,将一直等待别人的连接
			Socket s = ss.accept();
			socketList.add(s);
			//每当客户端连接后启动一条ServerThread线程为该客户服务
			new Thread(new ServerThread(s)).start();
		}
	}
}

客户端接收是一个Andorid程序

 

定义一个客户端线程类

 

public class ClientThread implements Runnable
{
	//该线程负责处理的Socket
	private Socket s;
	private Handler handler;
	//该线程所处理的Socket所对应的输入流
	BufferedReader br = null;
	public ClientThread(Socket s , Handler handler)
		throws IOException
	{
		this.s = s;
		this.handler = handler;
		br = new BufferedReader(
			new InputStreamReader(s.getInputStream()));
	}
	public void run()
	{
		try
		{
			String content = null;
			//不断读取Socket输入流中的内容。
			while ((content = br.readLine()) != null)
			{
				// 每当读到来自服务器的数据之后，发送消息通知程序界面显示该数据
				Message msg = new Message();
				msg.what = 0x123;
				msg.obj = content;
				handler.sendMessage(msg);
			}
		}
		catch (Exception e)
		{
			e.printStackTrace();
		}
	}
}

Activity中使用线程类

 

 

public class MultiThreadClient extends Activity
{
	// 定义界面上的两个文本框
	EditText input, show;
	// 定义界面上的一个按钮
	Button send;
	OutputStream os;
	Handler handler;

	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		input = (EditText) findViewById(R.id.input);
		send = (Button) findViewById(R.id.send);
		show = (EditText) findViewById(R.id.show);
		Socket s;
		handler = new Handler()
		{
			@Override
			public void handleMessage(Message msg)
			{
				// 如果消息来自于子线程
				if (msg.what == 0x123)
				{
					// 将读取的内容追加显示在文本框中
					show.append("\n" + msg.obj.toString());
				}
			}
		};
		try
		{
			s = new Socket("10.10.56.243", 34567);
			// 客户端启动ClientThread线程不断读取来自服务器的数据
			new Thread(new ClientThread(s, handler)).start(); // ①
			os = s.getOutputStream();
		}
		catch (Exception e)
		{
			e.printStackTrace();
		}
		send.setOnClickListener(new OnClickListener()
		{
			@Override
			public void onClick(View v)
			{
				try
				{
					// 将用户在文本框内输入的内容写入网络
					os.write((input.getText().toString() + "\r\n")
						.getBytes("utf-8"));
					// 清空input文本框
					input.setText("");
				}
				catch (Exception e)
				{
					e.printStackTrace();
				}
			}
		});
	}
}

界面如下