安卓聊天室的简单实现

版权声明：本文为博主原创文章，未经博主允许不得转载。转载请注明出处。 https://blog.csdn.net/qq_36882793/article/details/84140997

以下：内容参考自《菜鸟教程》（http://www.runoob.com/w3cnote/android-tutorial-socket1.html）。 内容仅用于自我记录学习使用。

基本逻辑的思路和菜鸟教程上一致（毕竟看着一步一步写的），在具体细节的写法上稍微优化了一下。写这个Demo的目的是了解一下Socket，因为自己对这方面的知识太过匮乏。

这个Demo中顺便使用了Java Stream 操作，并且顺便练习一下刚学习的RxJava内容。Java Stream操作可以参考 https://www.cnblogs.com/andywithu/p/7404101.html (或者自己搜索，网上比较多)，RxJava内容可以参考 https://www.jianshu.com/p/6fd8640046f1 及其系列内容（自我感觉是个不错的RxJava教程）。

服务器端 – 在Eclipse中写的

ChatNetSocketServerDemo

/**
 * 聊天室服务器
 * 多并发  -- 使用线程池为每个连接用户创建一个线程
 * @author qxb-810
 */
public class ChatNetSocketServerDemo {
	private static Server mServer;
	public static void main(String[] args) {
		mServer = new Server();
	}
}

Server

package com.server;

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.stream.Stream;

/**
 * @author qxb-810
 * 服务器的主体操作在这里进行
 */
public class Server implements MessageListener {
	private ExecutorService mExecutorService = null;
	private List<Socket> mSocketList;

	public Server() {
		initServer();
	}

	/**
	 * 初始化服务器
	 */
	private void initServer() {
		mSocketList = new ArrayList<Socket>();
		// 创建一个Socket服务器
		try {
			// 创建一个线程池
			mExecutorService = Executors.newCachedThreadPool();
			ServerSocket serverSocket = new ServerSocket(12345);
			String hostAddress = InetAddress.getLocalHost().getHostAddress(); // 获取服务器地址
			System.out.println("服务器 " + hostAddress + "已就绪");
			while(true){
				try {
					Socket accept = serverSocket.accept();
					mSocketList.add(accept);
					mExecutorService.execute(new ServiceRunnable(accept, Server.this));
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 发送信息给所有客户端
	 */
	@Override
	public void sendMessage(String msg) {
		mSocketList.stream().forEach(socket -> {
			try {
				PrintWriter pw = null;
				pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(), "utf-8")), true);
				pw.println(msg);
				System.out.println("stream sendMessage" + msg + "   " + socket.toString());
			} catch (Exception e) {
				e.printStackTrace();
			} 
		});
	}

	/**
	 *  退出聊天室
	 */
	@Override
	public void removeSocket(Socket socket) {
		sendMessage(socket.getInetAddress() + " 退出群聊， 当前人数" + mSocketList.size());
		mSocketList.remove(socket);
	}
}

/**
 * 消息回调接口
 * @author qxb-810
 */
interface MessageListener {
	void sendMessage(String msg);
	void removeSocket(Socket socket);
}

ServiceRunnable

package com.server;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;
import java.util.Timer;
import java.util.TimerTask;
/**
*  为每个客户端单独开辟的线程
*/
public class ServiceRunnable implements Runnable {
	private String mMessage;
	private Socket mSocket;
	private BufferedReader mBr = null;
	private MessageListener mListener;

	public ServiceRunnable(Socket mSocket, MessageListener listener) {
		super();
		this.mSocket = mSocket;
		this.mListener = listener;
		try {
			// 获取输入流
			mBr = new BufferedReader(new InputStreamReader(mSocket.getInputStream()));
			// 发送连接消息
			mMessage = mSocket.getInetAddress() + "加入聊天室";
			mListener.sendMessage(mMessage);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	/**
	 * 读取客户端发送来的信息, 并发送给其它客户端
	 */
	@Override
	public void run() {
		try {
			while (true) {
				if ((mMessage = mBr.readLine()) != null) {
					System.out.println("mMessage");
					if ("夏义春nb".equals(mMessage)) {
						mListener.removeSocket(mSocket);
						mBr.close();
						break;
					} else {
						mMessage = mSocket.getInetAddress() + ": " + mMessage;
						System.out.println("run " + mMessage);
						mListener.sendMessage(mMessage);
					}
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

客户端 — 在Android Studio中写的

MainActivity

package com.example.qxb_810.socketiodemo;

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.TimeUnit;

import butterknife.BindView;
import butterknife.ButterKnife;
import io.reactivex.Flowable;
import io.reactivex.Observable;
import io.reactivex.Scheduler;
import io.reactivex.android.schedulers.AndroidSchedulers;
import io.reactivex.functions.Consumer;
import io.reactivex.functions.Function;
import io.reactivex.schedulers.Schedulers;

public class MainActivity extends AppCompatActivity {
    private final static String TAG = MainActivity.class.getSimpleName();

    private final static String COMMAND_EXIT = "夏义春nb";

    @BindView(R.id.tv_title)
    TextView tvTitle;
    @BindView(R.id.tv_content)
    TextView tvContent;
    @BindView(R.id.btn_send)
    Button btnSend;
    @BindView(R.id.et_content)
    EditText etContent;

    private String mContent;
    private String mLocalIp;
    private String mServerIp = "XXXXXXXX";		// 服务器地址
    private int mServerHost = 12345;
    private PrintWriter mPw = null;
    private BufferedReader mBr = null;
    private Socket mSocket = null;
    private StringBuilder mSb = new StringBuilder("");

    //  out, writer : 输出流，自身发送信息
    //  in, read : 输入流，自身接收信息
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
        requestPermissions();
        Flowable.just(this)
                .subscribeOn(Schedulers.newThread())
                .doOnNext(mainActivity -> initSocket())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(mainActivity -> {
                    readMessage();
                    initEvent();
                });
    }

    /**
     * 动态申请权限  ----  API23后需要动态申请权限
     */
    private void requestPermissions() {
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            // 读写存储权限 和联网权限
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.INTERNET}, 1);
        }
    }

    /**
     * 初始化Socket连接
     *
     * @throws Exception
     */
    private void initSocket() throws Exception {
        mSocket = new Socket(mServerIp, mServerHost);
        mLocalIp = mSocket.getLocalAddress().getHostAddress();
        // 获取输入输出流
        mBr = new BufferedReader(new InputStreamReader(mSocket.getInputStream(), "utf-8"));
        mPw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(
                mSocket.getOutputStream())), true);
    }

    /**
     * 初始化事件
     */
    private void initEvent() {
        btnSend.setOnClickListener((v) -> {
            if (mSocket.isConnected() && !mSocket.isOutputShutdown()) {
                String content = etContent.getText().toString();
                sendMessage(mLocalIp + ": " + content);
                etContent.setText("");
            }
        });
    }

    /**
     * 向服务器发送信息
     */
    private void sendMessage(String message) {
        Observable.just(this)
                .subscribeOn(Schedulers.newThread())
                .doOnNext(mainActivity -> mPw.println(message))
                .subscribe();
    }

    /**
     * 读取服务器端发送的信息
     */
    private void readMessage() {
        // 从连接队列中取出一个连接, 如果没有则等待
        Observable.interval(1, TimeUnit.SECONDS)
                .observeOn(Schedulers.io())
                .map(mainActivity -> mSocket.isConnected() && !mSocket.isInputShutdown())
                .filter(flag -> flag && ((mContent = mBr.readLine()) != null))
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(flag -> tvContent.setText(mSb.append(mContent + "\n")));

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        try {
            sendMessage(COMMAND_EXIT);
            mPw.close();
            mBr.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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="com.example.qxb_810.socketiodemo.MainActivity"
    android:orientation="vertical"
    android:layout_gravity="center"
    android:gravity="center">
    
    <TextView
        android:id="@+id/tv_title"
        android:textSize="20dp"
        android:text="聊天室测试"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/tv_content"
        android:layout_width="match_parent"
        android:layout_height="400dp" />

    <EditText
        android:id="@+id/et_content"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="20dp"/>
    <Button
        android:id="@+id/btn_send"
        android:layout_width="200dp"
        android:layout_height="50dp"
        android:text="发送"/>

</LinearLayout>