Android Socket 聊天室

项目地址：https://github.com/SunnyLine/Android-Socket-ChatRoom
部分截图：

以下为代码逻辑部分
Java: 监听某个端口，有用户访问时，将这个Socket放入到一个集合中作为一个用户组，并监听这个Socket的消息。收到任意一个Socket的消息后，再将此消息分发给用户组的每一个成员。
Android：使用Socket连接指定IP指定端口，连接成功后发送一条信息给服务器，服务器会将之转发给其他人，其他人就可以知道组内有新用户加入的信息。离开此页面时也要发送给服务器一条离开的信息，服务器会告知其他用户。在子线程中监听服务器发送的数据进行显示。

Java代码如下：

public class Main {    private static final int PORT = 9999;    private static List<Socket> mList = new ArrayList<Socket>();    private static ServerSocket server = null;    private static ExecutorService mExecutorService = null; //thread pool    public static void main(String[] args) {        try {            server = new ServerSocket(PORT);            mExecutorService = Executors.newCachedThreadPool();  //create a thread pool            System.out.println("服务器已启动...");            Socket client = null;            while(true) {                client = server.accept();              //把客户端放入客户端集合中                mList.add(client);                mExecutorService.execute(new Service(client)); //start a new thread to handle the connection            }        }catch (Exception e) {            e.printStackTrace();        }    }    static 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()));                  //客户端只要一连到服务器，便向客户端发送下面的信息。                } catch (IOException e) {                    e.printStackTrace();                }            }            public byte[] readStream(InputStream inStream) throws Exception {                  ByteArrayOutputStream outSteam = new ByteArrayOutputStream();                  byte[] buffer = new byte[1024];                  int len = -1;                  while ((len = inStream.read(buffer)) != -1) {                      outSteam.write(buffer, 0, len);                  }                  outSteam.close();                  inStream.close();                  return outSteam.toByteArray();              }             @Override            public void run() {                try {                    while(true) {                        if((msg = in.readLine())!= null) {                            System.out.println("接收:"+msg);                            ChatBean bean =  new Gson().fromJson(msg, ChatBean.class);                            //当客户端发送的信息为：exit时，关闭连接                            if(bean.content.equals("exit")) {                                System.out.println("用戶:"+bean.name+"已退出谈论组");                                mList.remove(socket);                                in.close();                                socket.close();                                this.sendmsg();                                break;                              //接收客户端发过来的信息msg，然后发送给客户端。                            } else {                                this.sendmsg();                            }                        }                    }                } catch (Exception e) {                    e.printStackTrace();                }            }            /**             * 循环遍历客户端集合，给每个客户端都发送信息。             * 可以使用观察者模式设计讨论组             */           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())),true);                       pout.println(msg);                   }catch (IOException e) {                       e.printStackTrace();                   }               }           }        }    }

Android 部分代码如下：

public interface ChatView {    public String getHost();    public String getProt();    public String getUserId();    public void showDiaolg(String msg);    public void receiveMsg(ChatBean bean);}public class SocketThread extends Thread {    private Socket socket = null;    private BufferedReader in = null;    private PrintWriter out = null;    private ChatView chatView;    public SocketThread(ChatView chatView) {        this.chatView = chatView;    }    private void init() {        try {            socket = new Socket(chatView.getHost(), Integer.parseInt(chatView.getProt()));            in = new BufferedReader(new InputStreamReader(socket.getInputStream()));            out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())), true);            if (!socket.isOutputShutdown()) {                ChatBean bean = new ChatBean("join", chatView.getUserId());                out.println(new Gson().toJson(bean));            }        } catch (UnknownHostException e1) {            e1.printStackTrace();            mHandler.sendEmptyMessage(-1);        } catch (IOException ex) {            ex.printStackTrace();            mHandler.sendEmptyMessage(0);        } catch (IllegalArgumentException e2) {            e2.printStackTrace();            mHandler.sendEmptyMessage(-2);        }    }    public void sendMsg(String msg) {        ChatBean bean = new ChatBean(msg, chatView.getUserId());        if (!TextUtils.isEmpty(msg) && socket != null && socket.isConnected()) {            if (!socket.isOutputShutdown()) {                out.println(new Gson().toJson(bean));            }        }    }    //接收线程发送过来信息，并用TextView显示    public Handler mHandler = new Handler() {        public void handleMessage(Message msg) {            super.handleMessage(msg);            switch (msg.what) {                case -2:                    chatView.showDiaolg("IllegalArgumentException");                    break;                case -1:                    chatView.showDiaolg("UnknownHostException");                    break;                case 0:                    chatView.showDiaolg("IOException");                    break;                case 1:                    String content = (String) msg.obj;                    ChatBean bean = new Gson().fromJson(content, ChatBean.class);                    chatView.receiveMsg(bean);                    break;            }        }    };    @Override    public void run() {        super.run();        init();        //接收服务器的信息        try {            while (true) {                if (!socket.isClosed()) {                    if (socket.isConnected()) {                        if (!socket.isInputShutdown()) {                            String content;                            if ((content = in.readLine()) != null) {                                content += "\n";                                Message message = mHandler.obtainMessage();                                message.obj = content;                                message.what = 1;                                mHandler.sendMessage(message);                            } else {                            }                        }                    }                }            }        } catch (Exception e) {            e.printStackTrace();        }    }}