Android Socket通信的简单实现

公司要实现一个简单的聊天功能，提前研究一下Socket通信，而公司的服务端功能又没有实现，所以这里就把服务端的功能放到一个界面实现了。

直接上代码：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <EditText
        android:id="@+id/et_ip"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:hint="IP：端口"
        android:text="127.0.0.1:8081"
        android:layout_margin="10dp"
        android:padding="10dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toLeftOf="@+id/btn_connect"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/btn_connect"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        android:layout_margin="10dp"
        android:text="连接"/>

    <TextView
        android:id="@+id/tv_receive"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="接受数据："
        app:layout_constraintTop_toBottomOf="@+id/et_ip"
        app:layout_constraintLeft_toLeftOf="parent"
        android:textSize="14sp"
        android:layout_margin="10dp"/>

    <ScrollView
        android:id="@+id/sv_content"
        android:layout_width="match_parent"
        android:layout_height="200dp"
        app:layout_constraintTop_toBottomOf="@+id/tv_receive"
        app:layout_constraintLeft_toLeftOf="parent">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <TextView
                android:id="@+id/tv_content"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="聊天内容"
                android:textColor="#000"
                android:textSize="16sp"
                android:layout_margin="10dp"/>
        </LinearLayout>
    </ScrollView>

    <EditText
        android:id="@+id/et_input"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="发送内容"
        android:layout_margin="10dp"
        android:padding="10dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/sv_content" />

    <Button
        android:id="@+id/btn_service"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toBottomOf="@+id/et_input"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toLeftOf="@+id/btn_send"
        android:layout_margin="10dp"
        android:text="服务端发送"/>

    <Button
        android:id="@+id/btn_send"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toBottomOf="@+id/et_input"
        app:layout_constraintLeft_toRightOf="@+id/btn_service"
        app:layout_constraintRight_toRightOf="parent"
        android:layout_margin="10dp"
        android:text="发送"/>
</androidx.constraintlayout.widget.ConstraintLayout>

主要代码：

package com.app.socketdemo;

import android.annotation.SuppressLint;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.Html;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ScrollView;
import android.widget.TextView;
import android.widget.Toast;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;

import androidx.appcompat.app.AppCompatActivity;
import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;

public class MainActivity extends AppCompatActivity {
    @BindView(R.id.et_ip)
    EditText etIp;
    @BindView(R.id.btn_connect)
    Button btnConnect;
    @BindView(R.id.tv_receive)
    TextView tvReceive;
    @BindView(R.id.tv_content)
    TextView tvContent;
    @BindView(R.id.et_input)
    EditText etInput;
    @BindView(R.id.btn_send)
    Button btnSend;
    @BindView(R.id.sv_content)
    ScrollView svContent;
    @BindView(R.id.btn_service)
    Button btnService;

    private StringBuffer strMsg = new StringBuffer();

    private final int MESSAGE_ERROR = 0;
    private final int MESSAGE_SUCCEED = 1;
    private final int MESSAGE_RECEIVE = 2;

    private Socket sock;
    private OutputStream outx;
    private InputStream inx;

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

        //启动服务端
        new Thread(() -> new Server().startService()).start();
    }

    @OnClick({R.id.btn_connect, R.id.btn_service, R.id.btn_send})
    public void onViewClicked(View view) {
        switch (view.getId()) {
            case R.id.btn_connect://连接服务端
                String strip = etIp.getText().toString().trim();
                if (strip.indexOf(":") >= 0) {
                    //启动连接
                    new Socket_thread(strip).start();
                }
                break;
            case R.id.btn_service:
                if (!TextUtils.isEmpty(etInput.getText().toString())) {
                    sendString("服务端：" + etInput.getText().toString().trim());
                    etInput.setText("");
                } else {
                    Toast.makeText(this, "输入不可为空", Toast.LENGTH_SHORT).show();
                }
                break;
            case R.id.btn_send:
                if (!TextUtils.isEmpty(etInput.getText().toString())) {
                    sendStrSocket("客户端：" + etInput.getText().toString().trim());
                    etInput.setText("");
                } else {
                    Toast.makeText(this, "输入不可为空", Toast.LENGTH_SHORT).show();
                }
                break;
        }
    }

    /**
     * 连接服务器
     */
    class Socket_thread extends Thread {
        private String IP = "";//ip地址
        private int PORT = 0;//端口号

        public Socket_thread(String strip) {
            //如: 127.0.0.1:8081
            String[] stripx = strip.split(":");
            this.IP = stripx[0];
            this.PORT = Integer.parseInt(stripx[1]);
        }

        @Override
        public void run() {
            try {
                disSocket();
                //连接服务器，此处会一直处于阻塞，直到连接成功
                sock = new Socket(this.IP, this.PORT);
                //阻塞停止，表示连接成功
                setMessage("连接成功", MESSAGE_SUCCEED);
            } catch (Exception e) {
                setMessage("连接服务器时异常", MESSAGE_ERROR);
                e.printStackTrace();
                return;
            }
            try {
                //获取到输入输出流
                outx = sock.getOutputStream();
                inx = sock.getInputStream();
            } catch (Exception e) {
                setMessage("获取输入输出流异常", MESSAGE_ERROR);
                e.printStackTrace();
                return;
            }
            new Inx().start();
        }
    }

    /**
     * 循环接收数据
     */
    class Inx extends Thread {
        @Override
        public void run() {
            while (true) {
                byte[] bu = new byte[1024];
                try {
                    int conut = inx.read(bu);//设备重启，异常 将会一直停留在这
                    if (conut == -1) {
                        setMessage("服务器断开", MESSAGE_ERROR);
                        disSocket();
                        return;
                    }

                    String strread = new String(bu, "GBK").trim();
                    setMessage(strread, MESSAGE_RECEIVE);
                } catch (IOException e) {
                    System.out.println(e);
                }
            }
        }
    }

    /**
     * 断开连接
     */
    private void disSocket() {
        if (sock != null) {
            try {
                outx.close();
                inx.close();
                sock.close();
                sock = null;
            } catch (Exception e) {
                setMessage("断开连接时发生错误", MESSAGE_ERROR);
            }
        }
    }

    @SuppressLint("HandlerLeak")
    private Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.arg1) {
                case MESSAGE_ERROR:
                    disSocket();
                    strMsg.append(msg.obj + "<br>");
                    tvContent.setText(Html.fromHtml(strMsg.toString()));
                    break;
                case MESSAGE_SUCCEED:
                    strMsg.append(msg.obj + "<br>");
                    tvContent.setText(Html.fromHtml(strMsg.toString()));
                    break;
                case MESSAGE_RECEIVE:
                    //收到数据
                    strMsg.append(msg.obj);
                    if (!strMsg.toString().substring(strMsg.length() - 4, strMsg.length()).equals("<br>")) {
                        strMsg.append("<br>");
                    }
                    tvContent.setText(Html.fromHtml(strMsg.toString()));
                    svContent.fullScroll(ScrollView.FOCUS_DOWN);
                    break;
                default:
                    break;
            }
        }
    };

    /**
     * 发送消息
     */
    private void sendStrSocket(final String senddata) {
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    String str = "<font color='#EE2C2C'>" + senddata + "</font>";
                    outx.write(str.getBytes("gbk"));//"utf-8"
                } catch (Exception e) {
                    setMessage("数据发送异常", MESSAGE_ERROR);
                }
            }
        }).start();
    }

    /**
     * 消息处理
     */
    private void setMessage(String obj, int arg1){
        Message message = new Message();
        message.arg1 = arg1;
        message.obj = obj;
        handler.sendMessage(message);
    }

    /*************************************************************服务端(用于测试)**********************************************************************/
    private String msg = "";

    public class Server {
        ServerSocket serverSocket = null;
        public final int port = 8081;

        public Server() {
            //输出服务器的IP地址
            try {
                InetAddress addr = InetAddress.getLocalHost();
                serverSocket = new ServerSocket(port);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        public void startService() {
            try {
                while (true) {
                    Socket socket = null;
                    socket = serverSocket.accept();//等待一个客户端的连接，在连接之前，此方法是阻塞的
                    new ConnectThread(socket).start();
                    new ConnectThread1(socket).start();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }

        }

        /**
         * 向客户端发送信息
         */
        class ConnectThread extends Thread {
            Socket socket = null;

            public ConnectThread(Socket socket) {
                super();
                this.socket = socket;
            }

            @Override
            public void run() {
                try {
                    DataOutputStream out = new DataOutputStream(socket.getOutputStream());
                    while (true) {
                        Thread.sleep(1000);
                        if (!TextUtils.isEmpty(msg)) {
                            String str = "<font color='#4F94CD'>" + msg + "</font>";
                            out.write(str.getBytes("gbk"));
                            out.flush();
                            msg = "";
                        }
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }

        /**
         * 接收客户端信息
         */
        class ConnectThread1 extends Thread {
            Socket socket = null;

            public ConnectThread1(Socket socket) {
                super();
                this.socket = socket;
            }

            @Override
            public void run() {
                try {
                    DataInputStream inp = new DataInputStream(socket.getInputStream());
                    while (true) {
                        byte[] bu = new byte[1024];
                        int conut = inp.read(bu);//设备重启，异常 将会一直停留在这
                        if (conut == -1) {
                            setMessage("服务器断开", MESSAGE_ERROR);
                            return;
                        }
                        String strread = new String(bu, "GBK").trim();
                        setMessage(strread, MESSAGE_RECEIVE);
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    private void sendString(String str) {
        msg = str;
    }
}

运行效果：

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