java Socket服务端

1. public class ChatServer {
2. private static final int PORT = 8888; // 端口号
3. private static List<Socket> list = new ArrayList<Socket>(); // 保存连接对象
4. private ExecutorService exec;
5. private ServerSocket server;
6. 
   
7. public static void main(String[] args) {
8. new ChatServer();
9. }
10. 
    
11. public ChatServer() {
12. try {
13. server = new ServerSocket(PORT);
14. exec = Executors.newCachedThreadPool();
15. System.out.println("服务器已启动！");
16. 
    
17. Socket client = null;
18. while (true) {
19. client = server.accept(); // 接收客户连接
20. list.add(client);
21. exec.execute(new ChatTask(client));
22. }
23. } catch (IOException e) {
24. e.printStackTrace();
25. }
26. }
27. 
    
28. static class ChatTask implements Runnable {
29. private Socket socket;
30. private BufferedReader br;
31. private PrintWriter pw;
32. private String msg;
33. 
    
34. public ChatTask(Socket socket) throws IOException {
35. this.socket = socket;
36. br = new BufferedReader(new InputStreamReader(socket
37. .getInputStream()));
38. msg = "【" + this.socket.getInetAddress() + "】进入聊天室！当前聊天室有【"
39. + list.size() + "】人";
40. 
    
41. sendMessage();
42. }
43. 
    
44. public void run() {
45. try {
46. while ((msg = br.readLine()) != null) {
47. if (msg.trim().equals("bye")) {
48. list.remove(socket);
49. br.close();
50. pw.close();
51. msg = "【" + socket.getInetAddress() + "】离开聊天室！当前聊天室有【"
52. + list.size() + "】人";
53. socket.close();
54. 
    
55. sendMessage();
56. break;
57. } else {
58. msg = "【" + socket.getInetAddress() + "】说：" + msg;
59. sendMessage();
60. }
61. }
62. } catch (IOException e) {
63. e.printStackTrace();
64. }
65. }
66. 
    
67. /**
68. * 群发消息给聊天室的所有人
69. */
70. private void sendMessage() throws IOException {
71. System.out.println(msg);
72. for (Socket client : list) {
73. pw = new PrintWriter(client.getOutputStream(), true);
74. pw.println(msg);
75. }
76. }
77. }
78. }