本节引言:

上一节的概念课枯燥无味是吧,不过总有点收获是吧,本节开始我们来研究基于TCP协议的Socket 通信,先来了解下Socket的概念,以及Socket通信的模型,实现Socket的步骤,以及作为Socket服务 端与客户端的两位各做要做什么事情!好的,我们由浅入深来扣这个Socket吧!


1.什么是Socket?


2.Socket通信模型:

Socket通信实现步骤解析

Step 1:创建ServerSocket和Socket

Step 2:打开连接到的Socket的输入/输出流

Step 3:按照协议对Socket进行读/写操作

Step 4:关闭输入输出流,以及Socket

好的,我们接下来写一个简单的例子,开启服务端后,客户端点击按钮然后链接服务端, 并向服务端发送一串字符串,表示通过Socket链接上服务器~


3.Socket服务端的编写:

服务端要做的事有这些

Step 1:创建ServerSocket对象,绑定监听的端口

Step 2:调用accept()方法监听客户端的请求

Step 3:连接建立后,通过输入流读取客户端发送的请求信息

Step 4:通过输出流向客户端发送响应信息

Step 5:关闭相关资源

代码实现

直接在Eclipse下创建一个Java项目,然后把Java代码贴进去即可!


public class SocketServer {

    public static void main(String[] args) throws IOException {

        //1.创建一个服务器端Socket,即ServerSocket,指定绑定的端口,并监听此端口

        ServerSocket serverSocket = new ServerSocket(12345);

        InetAddress address = InetAddress.getLocalHost();

        String ip = address.getHostAddress();

        Socket socket = null;

        //2.调用accept()等待客户端连接

        System.out.println("~~~服务端已就绪,等待客户端接入~,服务端ip地址: " + ip);

        socket = serverSocket.accept();

        //3.连接后获取输入流,读取客户端信息

        InputStream is=null;

        InputStreamReader isr=null;

        BufferedReader br=null;

        OutputStream os=null;

        PrintWriter pw=null;

        is = socket.getInputStream();     //获取输入流

        isr = new InputStreamReader(is,"UTF-8");

        br = new BufferedReader(isr);

        String info = null;

        while((info=br.readLine())!=null){//循环读取客户端的信息

            System.out.println("客户端发送过来的信息" + info);

        }

        socket.shutdownInput();//关闭输入流

        socket.close();

    }

}

然后我们把代码run起来,控制台会打印:

好的,接下来到Android客户端了!


4.Socket客户端的编写:

客户端要做的事有这些

Step 1:创建Socket对象,指明需要链接的服务器的地址和端号

Step 2:链接建立后,通过输出流向服务器发送请求信息

Step 3:通过输出流获取服务器响应的信息

Step 4:关闭相关资源

代码实现

MainActivity.java


public class MainActivity extends AppCompatActivity implements View.OnClickListener {



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        Button btn_accept = (Button) findViewById(R.id.btn_accept);

        btn_accept.setOnClickListener(this);

    }



    @Override

    public void onClick(View v) {

        new Thread() {

            @Override

            public void run() {

                try {

                    acceptServer();

                } catch (IOException e) {

                    e.printStackTrace();

                }

            }

        }.start();

    }



    private void acceptServer() throws IOException {

        //1.创建客户端Socket,指定服务器地址和端口

        Socket socket = new Socket("172.16.2.54", 12345);

        //2.获取输出流,向服务器端发送信息

        OutputStream os = socket.getOutputStream();//字节输出流

        PrintWriter pw = new PrintWriter(os);//将输出流包装为打印流

        //获取客户端的IP地址

        InetAddress address = InetAddress.getLocalHost();

        String ip = address.getHostAddress();

        pw.write("客户端:~" + ip + "~ 接入服务器!!");

        pw.flush();

        socket.shutdownOutput();//关闭输出流

        socket.close();

    }

}

因为Android不允许在主线程(UI线程)中做网络操作,所以这里需要我们自己 另开一个线程来连接Socket!

运行结果:

点击按钮后,服务端控制台打印:


5.增强版案例:小猪简易聊天室

只是点击个按钮,然后服务器返回一串信息,肯定是很无趣的是吧,接下来我们来 搭建一个超简单的聊天室,我们需要用到线程池,存储Socket链接的集合,我们还需要 字节写一个线程,具体的我们在代码中来体会!

实现的效果图:

先把我们的服务端跑起来:

接着把我们的程序分别跑到两台模拟器上:

接下来我们来写代码:

首先是服务端,就是将读写socket的操作放到自定义线程当中,创建ServerSocket后,循环 调用accept方法,当有新客户端接入,将socket加入集合当中,同时在线程池新建一个线程!

另外,在读取信息的方法中,对输入字符串进行判断,如果为bye字符串,将socket从集合中 移除,然后close掉!

Server.java:


public class Server {

    //定义相关的参数,端口,存储Socket连接的集合,ServerSocket对象

    //以及线程池

    private static final int PORT = 12345;

    private List<Socket> mList = new ArrayList<Socket>();

    private ServerSocket server = null;

    private ExecutorService myExecutorService = null;

    

    

    public static void main(String[] args) {

        new Server();

    }



    public Server()

    {

        try

        {

            server = new ServerSocket(PORT);

            //创建线程池

            myExecutorService = Executors.newCachedThreadPool();

            System.out.println("服务端运行中...\n");

            Socket client = null;

            while(true)

            {

                client = server.accept();

                mList.add(client);

                myExecutorService.execute(new Service(client));

            }

            

        }catch(Exception e){e.printStackTrace();}

    }

    

    class Service implements Runnable

    {

        private Socket socket;

        private BufferedReader in = null;

        private String msg = "";

        

        public Service(Socket socket) {

            this.socket = socket;

            try

            {

                in = new BufferedReader(new InputStreamReader(socket.getInputStream()));

                 msg = "用户:" +this.socket.getInetAddress() + "~加入了聊天室"  

                            +"当前在线人数:" +mList.size();  

                this.sendmsg();

            }catch(IOException e){e.printStackTrace();}

        }

        

        

        

        @Override

        public void run() {

            try{

                while(true)

                {

                    if((msg = in.readLine()) != null)

                    {

                        if(msg.equals("bye"))

                        {

                            System.out.println("~~~~~~~~~~~~~");

                            mList.remove(socket);

                            in.close();

                            msg = "用户:" + socket.getInetAddress()  

                                    + "退出:" +"当前在线人数:"+mList.size();  

                            socket.close();  

                            this.sendmsg();  

                            break;

                        }else{

                            msg = socket.getInetAddress() + "   说: " + msg;  

                            this.sendmsg(); 

                        }

                    }

                }

            }catch(Exception e){e.printStackTrace();}

        }

        

        //为连接上服务端的每个客户端发送信息

        public void sendmsg()

        {

            System.out.println(msg);

            int num = mList.size();

            for(int index = 0;index < num;index++)

            {

                Socket mSocket = mList.get(index);  

                PrintWriter pout = null;  

                try {  

                    pout = new PrintWriter(new BufferedWriter(  

                            new OutputStreamWriter(mSocket.getOutputStream(),"UTF-8")),true);  

                    pout.println(msg);  

                }catch (IOException e) {e.printStackTrace();}  

            }

        }

        

    }

}

接着到客户端,客户端的难点在于要另外开辟线程的问题,因为Android不允许直接在 主线程中做网络操作,而且不允许在主线程外的线程操作UI,这里的做法是自己新建 一个线程,以及通过Hanlder来更新UI,实际开发不建议直接这样做!!!

布局文件:activity_main.xml


<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" >



    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="小猪简易聊天室" />

    <TextView

        android:id="@+id/txtshow"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        />

    <EditText

        android:id="@+id/editsend"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        />

    <Button

        android:id="@+id/btnsend"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="发送"

        />

</LinearLayout>

MainActivity.java:


public class MainActivity extends AppCompatActivity implements Runnable {



    //定义相关变量,完成初始化

    private TextView txtshow;

    private EditText editsend;

    private Button btnsend;

    private static final String HOST = "172.16.2.54";

    private static final int PORT = 12345;

    private Socket socket = null;

    private BufferedReader in = null;

    private PrintWriter out = null;

    private String content = "";

    private StringBuilder sb = null;



    //定义一个handler对象,用来刷新界面

    public Handler handler = new Handler() {

        public void handleMessage(Message msg) {

            if (msg.what == 0x123) {

                sb.append(content);

                txtshow.setText(sb.toString());

            }

        }



        ;

    };





    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        sb = new StringBuilder();

        txtshow = (TextView) findViewById(R.id.txtshow);

        editsend = (EditText) findViewById(R.id.editsend);

        btnsend = (Button) findViewById(R.id.btnsend);



        //当程序一开始运行的时候就实例化Socket对象,与服务端进行连接,获取输入输出流

        //因为4.0以后不能再主线程中进行网络操作,所以需要另外开辟一个线程

        new Thread() {



            public void run() {

                try {

                    socket = new Socket(HOST, PORT);

                    in = new BufferedReader(new InputStreamReader(socket.getInputStream(), "UTF-8"));

                    out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(

                            socket.getOutputStream())), true);

                } catch (IOException e) {

                    e.printStackTrace();

                }

            }

        }.start();



        //为发送按钮设置点击事件

        btnsend.setOnClickListener(new View.OnClickListener() {



            @Override

            public void onClick(View v) {

                String msg = editsend.getText().toString();

                if (socket.isConnected()) {

                    if (!socket.isOutputShutdown()) {

                        out.println(msg);

                    }

                }

            }

        });

        new Thread(MainActivity.this).start();

    }



    //重写run方法,在该方法中输入流的读取

    @Override

    public void run() {

        try {

            while (true) {

                if (socket.isConnected()) {

                    if (!socket.isInputShutdown()) {

                        if ((content = in.readLine()) != null) {

                            content += "\n";

                            handler.sendEmptyMessage(0x123);

                        }

                    }

                }

            }

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

}


本节小结:

好的,本节给大家讲解了基于TCP的Socket通信,文中介绍了Socket通信的模型,实现了 一个简单的Socket通信例子,以及写了一个增强版的实例:小猪聊天室,相信会对刚涉及 Socket编程的你带来便利~,谢谢~