多人聊天
server
import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SelectableChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.Iterator;
import java.util.Set;
public class ChatServer {
// 1. 定义属性
private Selector selector;
private ServerSocketChannel serverSocketChannel;
private static final String HOST = "localhost";
private static final int PORT = 6667;
public ChatServer() {
try {
selector = Selector.open();
serverSocketChannel = ServerSocketChannel.open();
serverSocketChannel.socket().bind(new InetSocketAddress(HOST, PORT));
serverSocketChannel.configureBlocking(false);
serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT);
} catch (IOException e) {
e.printStackTrace();
}
}
// eg: 监听
public void listen() {
try {
while (true) {
int count = selector.select(2000);
if (count > 0) {
Set<SelectionKey> selectedKeys = selector.selectedKeys();
Iterator<SelectionKey> keyIterator = selectedKeys.iterator();
while (keyIterator.hasNext()) {
SelectionKey key = keyIterator.next();
if (key.isAcceptable()) {
SocketChannel socketChannel = serverSocketChannel.accept();
socketChannel.configureBlocking(false);
socketChannel.register(selector, SelectionKey.OP_READ);
System.out.println(socketChannel.getRemoteAddress() + "....eg: 上线了...");
}
if (key.isReadable()) {// eg: 通道发送read事件
// eg: 处理读取
System.out.println("处理读数据....");
//readData
readData(key);
}
// eg: 删除当前key
keyIterator.remove();
}
} else {
System.out.println("等待...");
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
private void readData(SelectionKey key) {
SocketChannel socketChannel = null;
try {
socketChannel = (SocketChannel) key.channel();
ByteBuffer byteBuffer = ByteBuffer.allocate(1024);
int read = socketChannel.read(byteBuffer);
// eg: 根据 read 读取的数据做
if (read > 0) {
// eg: 把缓存数据转换成字符串
String msg = new String(byteBuffer.array());
System.out.println("from client:" + msg);
// eg: 向其他客户端转发消息，专门处理
sendInfoToOthers(msg,socketChannel);
}
} catch (Exception e) {
try {
System.out.println(socketChannel.getRemoteAddress()+"下线了...");
key.cancel();
socketChannel.close();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
}
// eg: 向其他客户端转发消息，专门处理
public void sendInfoToOthers(String msg, SocketChannel self) throws Exception {
System.out.println("sendInfoToOthers....");
Set<SelectionKey> keys = selector.keys();
for (SelectionKey selectionKey : keys) {
SelectableChannel channel = selectionKey.channel();
if (channel instanceof SocketChannel && self != channel) {
SocketChannel sc = (SocketChannel) channel;
ByteBuffer wrap = ByteBuffer.wrap(msg.getBytes());
sc.write(wrap);
}
}
}
public static void main(String[] args) {
ChatServer server = new ChatServer();
server.listen();
}
}
client
import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.SocketChannel;
import java.util.Iterator;
import java.util.Scanner;
import java.util.Set;
public class ChatClient {
// 1. 定义属性
private Selector selector;
private String username;
private SocketChannel socketChannel;
private static final String HOST = "localhost";
private static final int PORT = 6667;
public ChatClient() {
try {
selector = Selector.open();
socketChannel = SocketChannel.open(new InetSocketAddress(HOST, PORT));
socketChannel.configureBlocking(false);
socketChannel.register(selector, SelectionKey.OP_READ);
username = socketChannel.getLocalAddress().toString().substring(1);
System.out.println("username:" + username);
} catch (IOException e) {
e.printStackTrace();
}
}
//eg: 向服务器发送消息
public void sendMsg2Server(String info) {
info = username +" : "+ info;
try {
socketChannel.write(ByteBuffer.wrap(info.getBytes()));
} catch (IOException e) {
e.printStackTrace();
}
}
//eg: 读取从服务器回复的消息
public void readInfo() {
try {
int select = selector.select();
if(select > 0) {
Set<SelectionKey> keys = selector.selectedKeys();
Iterator<SelectionKey> iterator = keys.iterator();
while (iterator.hasNext()) {
SelectionKey selectionKey = iterator.next();
if(selectionKey.isReadable()) {
SocketChannel channel = (SocketChannel) selectionKey.channel();
ByteBuffer buffer = ByteBuffer.allocate(1024);
channel.read(buffer);
//eg: 把读取到的数据转换成字符串
System.out.println(new String(buffer.array()));
}
}
// 这里应该移除这个key
iterator.remove();
}else {
}
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
ChatClient client = new ChatClient();
new Thread() {
@Override
public void run() {
while (true) {
client.readInfo();
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
};
}.start();
Scanner scanner = new Scanner(System.in);
while (scanner.hasNextLine()) {
String msg = scanner.nextLine();
client.sendMsg2Server(msg);
}
scanner.close();
}
}
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