JAVA-NIO实现聊天室详细代码说明
JAVA-NIO实现聊天室详细代码说明
github源码：https://github.com/JolyouLu/JAVAIO.git
src\main\java\com\JolyouLu\nio\groupchat 文件夹下
public class GroupChatServer {
//定义属性
private Selector selector;
private ServerSocketChannel listenChannel;
private static final int PORT = 6666;
//构造器 完成初始化工作
public GroupChatServer() {
try {
//得到选择器
selector = Selector.open();
//初始化ServerSocketChannel
listenChannel = ServerSocketChannel.open();
//绑定端口
listenChannel.socket().bind(new InetSocketAddress(PORT));
//设置非阻塞模式
listenChannel.configureBlocking(false);
//将来listenChannel注册到Selector
listenChannel.register(selector, SelectionKey.OP_ACCEPT);
}catch (IOException e){
e.printStackTrace();
}
}
//监听
public void listen(){
try {
//循环监听
while (true){
int count = selector.select(2000); //阻塞2秒监听，通道有没有事件发生
if (count > 0){ //返回>0 有事件要处理
//遍历selectedKeys集合
Iterator iterator = selector.selectedKeys().iterator();
while (iterator.hasNext()){
//获取SelectionKey
SelectionKey key = iterator.next();
if (key.isAcceptable()){ //如果通道发生，客户端连接事件
//为连接的客户端，生成socketChannel
SocketChannel socketChannel = listenChannel.accept();
//切换非阻塞模式
socketChannel.configureBlocking(false);
//把socketChannel注册到selector中，并监听读事件
socketChannel.register(selector,SelectionKey.OP_READ);
//提示客户端连接上了
System.out.println(socketChannel.getRemoteAddress() + " 客户端 上线");
}
if (key.isReadable()){//如果通道发生，可读事件
//处理读
readData(key);
}
//清理读取的selectedKeys容器 防止重复处理
iterator.remove();
}
}
}
}catch (Exception e){
e.printStackTrace();
}finally {
}
}
//读取客户端消息
private void readData(SelectionKey key){
//定义一个SocketChannel
SocketChannel channel = null;
try {
//取到关联的channel
channel = (SocketChannel) key.channel();
//创建buffer
ByteBuffer buffer = ByteBuffer.allocate(1024);
int count = channel.read(buffer);
//根据count的值做处理
if (count > 0){ //读取到数据
//把缓冲区的数据转字符串
String msg = new String(buffer.array(), "GBK");
//输出消息
System.out.println("from 客户端："+ msg);
//向其它客户端转发消息
sendInfoToOtherClients(msg,channel);
}
}catch (IOException e){
try {
System.out.println(channel.getRemoteAddress() + " 离线了..");
//取消注册
key.cancel();
//关闭通道
channel.close();
} catch (IOException ioException) {
ioException.printStackTrace();
}
}
}
//转发消息给其它客户端(channel)
private void sendInfoToOtherClients(String msg,SocketChannel self) throws IOException {
System.out.println("服务器转发消息中...");
//遍历 所有的注册到Selector的SocketChannel排查self
for (SelectionKey key : selector.keys()) {
//取出通道
Channel targetChannel = key.channel();
//targetChanneld的类型是SocketChannel，并且targetChannel不是自己
if (targetChannel instanceof SocketChannel && targetChannel != self){
//转型
SocketChannel dest = (SocketChannel)targetChannel;
//将来msg 存到buffer
ByteBuffer buffer = ByteBuffer.wrap(msg.getBytes("GBK"));
//将来buffer的数据写入通道
dest.write(buffer);
}
}
}
public static void main(String[] args) {
//初始化服务器对象
GroupChatServer chatServer = new GroupChatServer();
chatServer.listen();
}
}
客户端
public class GroupChatClient {
//定义相关属性
private final String HOST = "127.0.0.1"; //服务器IP
private final int PORT = 6666; //服务器端口
private Selector selector;
private SocketChannel socketChannel;
private String username;
//构造器,初始化
public GroupChatClient() {
try {
//得到选择器
selector = Selector.open();
//连接服务
socketChannel = SocketChannel.open(new InetSocketAddress(HOST,PORT));
//设置非阻塞
socketChannel.configureBlocking(false);
//将来socketChannel注册到Selector，关注读事件
socketChannel.register(selector, SelectionKey.OP_READ);
//得到username
username = socketChannel.getLocalAddress().toString().substring(1);
System.out.println(username + " is ok ...");
}catch (Exception e){
e.printStackTrace();
}
}
//向服务器发送消息
public void sendInfo(String info){
info = username + " 说：" + info;
try {
socketChannel.write(ByteBuffer.wrap(info.getBytes("GBK")));
}catch (IOException e){
e.printStackTrace();
}
}
//读取从服务器端回复的消息
public void readInfo(){
try {
int readChannels = selector.select(2000);
if (readChannels > 0){//有可用的通道
Iterator iterator = selector.selectedKeys().iterator();
while (iterator.hasNext()){
SelectionKey key = iterator.next();
if (key.isReadable()){
//得到相关的通道
SocketChannel socketChannel = (SocketChannel) key.channel();
//得到一个Buffer
ByteBuffer buffer = ByteBuffer.allocate(1024);
//buffer 读取通道数据
socketChannel.read(buffer);
//把读到缓冲区的数据转成字符串
String msg = new String(buffer.array());
System.out.println(msg.trim());
}
iterator.remove();
}
}
}catch (IOException e){
e.printStackTrace();
}
}
public static void main(String[] args) {
//启动客户端
GroupChatClient chatClient = new GroupChatClient();
//启动一个线程,每隔开3秒读取服务器发送的数据
new Thread(new Runnable() {
@Override
public void run() {
while (true){
chatClient.readInfo();
try {
Thread.currentThread().sleep(3000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}).start();
//发送数据
Scanner scanner = new Scanner(System.in);
while (scanner.hasNextLine()){
String s = scanner.nextLine();
chatClient.sendInfo(s);
}
}
}
测试
设置启动参数，当前类可以同时运行多个
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