nio 代碼實現簡易多人聊天
阿新 • • 發佈：2018-09-05
false size spl closed write content 輸入 utf oom 
這幾天在學習nio相關知識。實現了一個簡單的多人聊天程序。
服務端代碼;
1 import java.io.IOException; 2 import java.net.InetSocketAddress; 3 import java.nio.ByteBuffer; 4 import java.nio.channels.*; 5 import java.nio.charset.Charset; 6 import java.util.*; 7 8 /** 9 * @ClassName CharRoomServer 10 * @Description TODOView Code11 * @Author hufeng8 12 * @Date 2018/8/3 14:39 13 * @Version 1.0 14 */ 15 public class CharRoomServer implements Runnable{ 16 17 private ServerSocketChannel serverSocketChannel = null; 18 19 private Selector selector = null; 20 21 public static final int PORT_NUM = 1198; 22 23private boolean active = true; 24 25 private Charset charset = Charset.forName("UTF-8"); 26 27 private List<String> users = new ArrayList<String>(); 28 29 private ByteBuffer byteBuffer = ByteBuffer.allocate(2*1024); 30 31 public static final String protocol = "#user#";32 33 public CharRoomServer() { 34 this.init(); 35 } 36 37 public void init() { 38 try { 39 selector = Selector.open(); 40 serverSocketChannel = ServerSocketChannel.open(); 41 serverSocketChannel.socket().bind(new InetSocketAddress(PORT_NUM)); 42 serverSocketChannel.configureBlocking(false); 43 serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT); 44 } catch (IOException e) { 45 e.printStackTrace(); 46 } 47 } 48 49 public void run() { 50 System.out.println("開始監聽。。。。"); 51 while (active) { 52 try { 53 //非阻塞接受連接 54 // int s = selector.selectNow(); 55 56 //阻塞連接 57 int s = selector.select(); 58 59 System.out.println("服務端接受到連接總數"+selector.keys().size()); 60 } catch (IOException e) { 61 e.printStackTrace(); 62 } 63 System.out.println("服務端接受到的選擇連接數"+selector.selectedKeys().size()); 64 Iterator<SelectionKey> keys = selector.selectedKeys().iterator(); 65 while (keys.hasNext()) { 66 SelectionKey k = keys.next(); 67 keys.remove(); 68 //處理邏輯 69 doHandler(selector, k); 70 } 71 } 72 } 73 74 private void doHandler(Selector selector, SelectionKey k) { 75 try { 76 //連接事件 77 if (k.isConnectable()) { 78 System.out.println("Connectable 連接事件"); 79 } else if (k.isAcceptable()) { 80 ServerSocketChannel ser = (ServerSocketChannel) k.channel(); 81 if (ser == serverSocketChannel) { 82 System.out.println("同一個連接"); 83 } 84 SocketChannel socketChannel = ser.accept(); 85 socketChannel.configureBlocking(false); 86 socketChannel.register(selector, SelectionKey.OP_READ); 87 socketChannel.write(charset.encode("please enter login name:")); 88 89 //設置k為接受事件，準備接受其它請求？ 90 91 } else if (k.isReadable()) { 92 //獲取客戶端連接 93 SocketChannel socketChannel = (SocketChannel) k.channel(); 94 StringBuffer content = new StringBuffer(); 95 int sum = 0; 96 try { 97 byteBuffer.clear(); 98 while ((sum = socketChannel.read(byteBuffer)) > 0) { 99 byteBuffer.flip(); 100 content.append(charset.decode(byteBuffer)); 101 } 102 System.out.println(sum); 103 //判斷客戶端連接關閉 104 if (sum == -1) { 105 socketChannel.close(); 106 System.out.println("1--關閉連接"); 107 } 108 109 System.out.println("服務端：監聽："+ content.toString()); 110 } catch (Exception e) { 111 System.out.println("2--關閉連接"); 112 k.cancel(); 113 if (null != socketChannel) { 114 socketChannel.close(); 115 } 116 } 117 if (content.length() > 0) { 118 //按照協議切分內容 119 String[] contents = content.toString().split(protocol); 120 //登陸用戶 121 if (contents != null && contents.length == 1) { 122 String user = contents[0]; 123 if (users.contains(user)) { 124 socketChannel.write(charset.encode("登陸用戶已存在！")); 125 } else { 126 users.add(user); 127 //獲取在線人數 128 int i = onlineCount(selector); 129 //廣播登陸消息給當前房間所有人 130 brokerMessage(selector, k, "歡迎"+user+"登陸，當前第"+i+"號"); 131 } 132 } else if (contents != null && contents.length > 1) { 133 String message = contents[0] + "say :" + contents[1]; 134 brokerMessage(selector, k, message); 135 } 136 } 137 } else if (k.isWritable()) { 138 139 } 140 } catch (Exception e) { 141 e.printStackTrace(); 142 } 143 } 144 145 /** 146 * 廣播消息 147 * @param content 148 */ 149 private void brokerMessage(Selector selector, SelectionKey k, String content) { 150 for (SelectionKey key : selector.keys()) { 151 if (key.channel() instanceof SocketChannel && key != k) { 152 try { 153 SocketChannel sc = (SocketChannel) key.channel(); 154 sc.write(charset.encode(content)); 155 } catch (IOException e1) { 156 e1.printStackTrace(); 157 } 158 } 159 } 160 } 161 162 /** 163 * 統計在線人數 164 * @param selector 165 * @return 166 */ 167 private int onlineCount(Selector selector) { 168 169 return 0; 170 } 171 172 public static void main(String[] args) { 173 System.out.println("開始啟動服務"); 174 new Thread(new CharRoomServer()).start(); 175 System.out.println("服務啟動"); 176 } 177 }
客戶端代碼;
1 import java.io.IOException; 2 import java.net.InetSocketAddress; 3 import java.nio.ByteBuffer; 4 import java.nio.channels.SelectionKey; 5 import java.nio.channels.Selector; 6 import java.nio.channels.SocketChannel; 7 import java.nio.charset.Charset; 8 import java.util.Iterator; 9 import java.util.Scanner; 10 11 /** 12 * @ClassName ChatRoomClient 13 * @Description TODO 14 * @Author hufeng8 15 * @Date 2018/8/3 16:37 16 * @Version 1.0 17 */ 18 public class ChatRoomClient implements Runnable{ 19 20 21 private SocketChannel channel; 22 private Selector selector; 23 private boolean active = true; 24 private Charset charset = Charset.forName("UTF-8"); 25 26 private String name = ""; 27 28 public ChatRoomClient() { 29 30 try { 31 selector = Selector.open(); 32 channel = SocketChannel.open(new InetSocketAddress("localhost",CharRoomServer.PORT_NUM)); 33 channel.configureBlocking(false); 34 channel.register(selector, SelectionKey.OP_CONNECT|SelectionKey.OP_READ); 35 36 } catch (IOException e) { 37 e.printStackTrace(); 38 } 39 } 40 41 public void run() { 42 System.out.println("客戶端監聽開始："); 43 while (active) { 44 try { 45 selector.select(); 46 } catch (IOException e) { 47 e.printStackTrace(); 48 } 49 // System.out.println(selector.selectedKeys().size()); 50 Iterator<SelectionKey> iterator = selector.selectedKeys().iterator(); 51 while (iterator.hasNext()) { 52 SelectionKey next = iterator.next(); 53 iterator.remove(); 54 if (channel == next.channel()) { 55 // System.out.println("同一個對象"); 56 } 57 // System.out.println("channel:"+channel+", sockchannel"+next.channel()+"連接事件："+next.isConnectable()+", "+next.isReadable()+", "+next.isWritable()); 58 if (next.isConnectable()) { 59 try { 60 System.out.println("客戶端連接事件"); 61 SocketChannel sc = (SocketChannel) next.channel(); 62 sc.configureBlocking(false); 63 sc.register(selector, SelectionKey.OP_READ); 64 } catch (IOException e) { 65 e.printStackTrace(); 66 } 67 } else if (next.isWritable()) { 68 System.out.println("客戶端寫事件"); 69 } else if (next.isReadable()) { 70 SocketChannel sc = (SocketChannel) next.channel(); 71 if (channel == sc) { 72 System.out.println("同一個對象"); 73 } 74 System.out.println("客戶端讀取事件"); 75 ByteBuffer bf = ByteBuffer.allocate(2*1024); 76 int i = 0; 77 StringBuffer content = new StringBuffer(); 78 try { 79 while ((i = sc.read(bf)) > 0) { 80 bf.flip(); 81 content.append(charset.decode(bf)); 82 } 83 System.out.println(content.toString()); 84 // next.interestOps(SelectionKey.OP_READ); 85 } catch (IOException e) { 86 e.printStackTrace(); 87 next.cancel(); 88 if (sc != null) { 89 try { 90 sc.close(); 91 } catch (IOException e1) { 92 e1.printStackTrace(); 93 } 94 } 95 } 96 } 97 } 98 } 99 } 100 101 public SocketChannel getChannel() { 102 return channel; 103 } 104 105 public String getName() { 106 return name; 107 } 108 109 public void setName(String name) { 110 this.name = name; 111 } 112 113 public Charset getCharset() { 114 return charset; 115 } 116 117 public void setCharset(Charset charset) { 118 this.charset = charset; 119 } 120 121 public static void main(String[] args) { 122 ChatRoomClient chatRoomClient = new ChatRoomClient(); 123 new Thread(chatRoomClient).start(); 124 String name = chatRoomClient.getName(); 125 SocketChannel sc = chatRoomClient.getChannel(); 126 Charset charset = chatRoomClient.getCharset(); 127 System.out.println("請輸入："); 128 Scanner scan = new Scanner(System.in); 129 while (scan.hasNextLine()) { 130 String data = scan.next(); 131 if ("".equals(data)) { 132 continue; 133 } else if ("".equals(name)) { 134 name = data; 135 data = name + CharRoomServer.protocol; 136 } else { 137 data = name + CharRoomServer.protocol + data; 138 } 139 try { 140 sc.write(charset.encode(data)); 141 } catch (IOException e) { 142 143 } 144 } 145 146 } 147 }View Code
nio 代碼實現簡易多人聊天