@linux1s1s 2017-01-22T17:18:41.000000Z 字数 5609 阅读 2514

Android Socket

AndroidHttp 2015-05

客户端编程步骤：

1：创建客户端套接字（指定服务器端IP地址与端口号）
2：连接（Android 创建Socket时会自动连接）
3：与服务器端进行通信
4：关闭套接字

客户端先建立连接后先获得输出流，然后再获得输入流。不然活有EOFException的异常。

中间的管道连接是通过InputStream/OutputStream流实现的。

一旦管道建立起来可进行通信。

关闭管道的同时意味着关闭Socket 。

当对同一个Socket创建重复管道时会异常。

 try {  
    //连接服务器 并设置连接超时为5秒  
    socket = new Socket();  
    socket.connect(new InetSocketAddress("1.1.9.30", 30000), 5000);  
    //先获取输出流  
    OutputStream ou = socket.getOutputStream(); 
    //再获取输入流
    BufferedReader bff = new BufferedReader(new InputStreamReader(  
            socket.getInputStream()));  
    //读取发来服务器信息  
    String line = null;  
    buffer="";  
    while ((line = bff.readLine()) != null) {  
        buffer = line + buffer;  
    }  
    //向输出流写入信息，即向服务器发送信息  
    ou.write("android 客户端".getBytes("gbk"));  
    ou.flush();  
    bundle.putString("msg", buffer.toString());  
    msg.setData(bundle);  
    //发送消息 修改UI线程中的组件  
    myHandler.sendMessage(msg);  
} catch (IOException e) {  
    e.printStackTrace();  
}finally
{
    //关闭各种输入输出流以及套接字
    bff.close();  
    ou.close();  
    socket.close(); 
}

服务器端编程步骤：

1：创建服务器端套接字并绑定到一个端口上（0-1023是系统预留的，最好大约1024）
2：套接字设置监听模式等待连接请求
3：接受连接请求后进行通信
4：返回，等待赢一个连接请求

服务器端首先得到输入流，然后将输入流信息输出到其各个客户端

中间的管道连接是通过InputStream/OutputStream流实现的。

一旦管道建立起来可进行通信。

关闭管道的同时意味着关闭Socket 。

当对同一个Socket创建重复管道时会异常。

public class AndroidService {  
    public static void main(String[] args) throws IOException {  
        ServerSocket serivce = new ServerSocket(30000);  
        while (true) {  
            //等待客户端连接  
            Socket socket = serivce.accept();  
            new Thread(new AndroidRunable(socket)).start();  
        }  
    }  
}

String str = "hello world!";
 try {  
    // 首先得到输入流，将输入流读入内存
    input = socket.getInputStream();  
    BufferedReader bff = new BufferedReader(  
            new InputStreamReader(input));  
    //然后再向客户端发送信息  
    output = socket.getOutputStream();
    output.write(str.getBytes("gbk"));  
    output.flush();  
    //半关闭socket    
    socket.shutdownOutput();  
    //获取客户端的信息  
    while ((line = bff.readLine()) != null) {  
        System.out.print(line);  //这里仅仅是测试使用的，接收到客户端的信息打印出来，有点无聊\(^o^)/~
    }  
} catch (IOException e) {  
    e.printStackTrace();  
} 
finally
{
    //关闭各种输入输出流以及套接字
    output.close();  
    bff.close();  
    input.close();  
    socket.close();  
}

客户端Demo

public class SocketActivity extends Activity {
    EditText editText = null;
    Button sendButton = null;
    TextView display = null;
    Socket client = null;
    MyHandler myHandler;
    DataOutputStream dout;
    DataInputStream din;
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.clientsocket);
        editText = (EditText) findViewById(R.id.message);
        sendButton = (Button) findViewById(R.id.send);
        display = (TextView) findViewById(R.id.display);
        sendButton.setOnClickListener(listener);
        try {
            client = new Socket("192.168.0.120", 50003);
            dout = new DataOutputStream(client.getOutputStream());
            din = new DataInputStream(client.getInputStream());
        } catch (UnknownHostException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        myHandler = new MyHandler();
        MyThread m = new MyThread();
        m.start();
    }
    class MyHandler extends Handler {
        public MyHandler() {
        }
        // 子类必须重写此方法,接受数据
        @Override
        public void handleMessage(Message msg) {
            // TODO Auto-generated method stub
            Log.d("MyHandler", "handleMessage......");
            super.handleMessage(msg);
            // 此处可以更新UI
            if (client != null && client.isConnected()) {
                Log.i("handler..", "*-----*");
                try {
                    dout.writeUTF("connect...");
                    String message = din.readUTF();
                    if (!message.equals(""))
                        display.setText(display.getText().toString() + "\n"
                                + "服务器发来的消息--：" + message);
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
    }
    class MyThread extends Thread {
        public void run() {
            while (true) {
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                Message msg = new Message();
                SocketActivity.this.myHandler.sendMessage(msg);
            }
        }
    }
    OnClickListener listener = new OnClickListener() {
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            String sendText = editText.getText().toString();
            try {
                // din = new DataInputStream(client.getInputStream());
                dout.writeUTF(sendText);
                /*
                 * display.setText(display.getText().toString() + "\n" +
                 * "服务器发来的消息：" + din.readUTF());
                 */
                /*
                 * display.setText(display.getText().toString() + "\n" +
                 * "服务器发来的消息--：" + din.readUTF());
                 */
            } catch (UnknownHostException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    };
}

服务器Demo

public class Server {
    static ServerSocket aServerSocket = null; // Server Socet.
    DataInputStream aDataInput = null; // Server input Stream that to
    // receive msg from client.
    DataOutputStream aDataOutput = null; // Server output Stream that to
    static ArrayList list = new ArrayList();
    public static void main(String[] args) {
        try {
            aServerSocket = new ServerSocket(50003); // listen 8888 port.
            System.out.println("already listen 50003 port.");
        } catch (Exception e) {
            e.printStackTrace();
        }
        int num = 0;
        while (num < 10) {
            Socket aSessionSoket = null;
            try {
                aSessionSoket = aServerSocket.accept();
                MyThread thread = new Server().new MyThread(aSessionSoket);
                thread.start();
                num = list.size();
            } catch (IOException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }
        }
    }
    class MyThread extends Thread {
        Socket aSessionSoket = null;
        public MyThread(Socket socket) {
            aSessionSoket = socket;
        }
        public void run() {
            try {
                aDataInput = new DataInputStream(aSessionSoket.getInputStream());
                aDataOutput = new DataOutputStream(aSessionSoket
                        .getOutputStream());
                list.add(aDataOutput);
                while (true) {
                    String msg = aDataInput.readUTF(); // read msg.
                    if (!msg.equals("connect...")) {
                        System.out.println("ip: "
                                + aSessionSoket.getInetAddress());// ip.
                        System.out.println("receive msg: " + msg);
                        for (int i = 0; i < list.size(); i++) {
                            DataOutputStream output = (DataOutputStream) list
                                    .get(i);
                            output.writeUTF(msg + "----" + list.size());
                        }
                        if (msg.equals("end"))
                            break;
                    }
                    aDataOutput.writeUTF("");
                }
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } finally {
                try {
                    aDataInput.close();
                    if (aDataOutput != null)
                        aDataOutput.close();
                    list.remove(aDataOutput);
                    aSessionSoket.close();
                } catch (Exception e2) {
                    e2.printStackTrace();
                }
            }
        }
    }
}

附注：以上只是对Android的Socket编程的大致思路和过程，其中缺少了对于InputStream/OututStream 的异常处理，连接超时等处理。
本文参考：http://duguyidao.iteye.com/blog/1069736