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群聊系统

  • 编写服务端

public class GroupChatServer {

private int port; //监听端口

public GroupChatServer(int port) {
this.port = port;
}

//编写run方法,处理客户端的请求
public void run() throws Exception{

//创建两个线程组
EventLoopGroup bossGroup = new NioEventLoopGroup(1);
EventLoopGroup workerGroup = new NioEventLoopGroup(); //8个NioEventLoop

try {
ServerBootstrap b = new ServerBootstrap();

b.group(bossGroup, workerGroup)
.channel(NioServerSocketChannel.class)
.option(ChannelOption.SO_BACKLOG, 128)
.childOption(ChannelOption.SO_KEEPALIVE, true)
.childHandler(new ChannelInitializer<SocketChannel>() {

@Override
protected void initChannel(SocketChannel ch) throws Exception {

//获取到pipeline
ChannelPipeline pipeline = ch.pipeline();
//向pipeline加入解码器
pipeline.addLast("decoder", new StringDecoder());
//向pipeline加入编码器
pipeline.addLast("encoder", new StringEncoder());
//加入自己的业务处理handler
pipeline.addLast(new GroupChatServerHandler());

}
});

System.out.println("netty 服务器启动");
ChannelFuture channelFuture = b.bind(port).sync();

//监听关闭
channelFuture.channel().closeFuture().sync();
}finally {
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
}

}

public static void main(String[] args) throws Exception {

new GroupChatServer(7000).run();
}
}

  • 编写服务端处理器

public class GroupChatServerHandler extends SimpleChannelInboundHandler<String> {

// 可以new 1个list集合用于管理channel,也可以使用channelGroup管理
//public static List<Channel> channels = new ArrayList<Channel>();

//定义一个channle 组,管理所有的channel
//GlobalEventExecutor.INSTANCE) 是全局的事件执行器,是一个单例
private static ChannelGroup channelGroup = new DefaultChannelGroup(GlobalEventExecutor.INSTANCE);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");


//handlerAdded 表示连接建立,一旦连接,第一个被执行
//将当前channel 加入到 channelGroup
@Override
public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
Channel channel = ctx.channel();
//将该客户加入聊天的信息推送给其它在线的客户端
/*
该方法会将 channelGroup 中所有的channel 遍历,并发送 消息,
我们不需要自己遍历
*/
channelGroup.writeAndFlush("[客户端]" + channel.remoteAddress() + " 加入聊天" + sdf.format(new java.util.Date()) + " \n");
channelGroup.add(channel);

}

//断开连接, 将xx客户离开信息推送给当前在线的客户
@Override
public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {

Channel channel = ctx.channel();
channelGroup.writeAndFlush("[客户端]" + channel.remoteAddress() + " 离开了\n");
System.out.println("channelGroup size" + channelGroup.size());
}

//表示channel 处于活动状态, 提示 xx上线
@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
System.out.println(ctx.channel().remoteAddress() + " 上线了~");
}

//表示channel 处于不活动状态, 提示 xx离线了
@Override
public void channelInactive(ChannelHandlerContext ctx) throws Exception {
System.out.println(ctx.channel().remoteAddress() + " 离线了~");
}

//读取数据
@Override
protected void channelRead0(ChannelHandlerContext ctx, String msg) throws Exception {

//获取到当前channel
Channel channel = ctx.channel();
//这时我们遍历channelGroup, 根据不同的情况,回送不同的消息

channelGroup.forEach(ch -> {
if(channel != ch) { //不是当前的channel,转发消息
ch.writeAndFlush("[客户]" + channel.remoteAddress() + " 发送了消息" + msg + "\n");
}else {//回显自己发送的消息给自己
ch.writeAndFlush("[自己]发送了消息" + msg + "\n");
}
});
}

@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
//关闭通道
ctx.close();
}
}

  • 编写客户端

public class GroupChatClient {

//属性
private final String host;
private final int port;

public GroupChatClient(String host, int port) {
this.host = host;
this.port = port;
}

public void run() throws Exception{
EventLoopGroup group = new NioEventLoopGroup();

try {

Bootstrap bootstrap = new Bootstrap()
.group(group)
.channel(NioSocketChannel.class)
.handler(new ChannelInitializer<SocketChannel>() {

@Override
protected void initChannel(SocketChannel ch) throws Exception {

//得到pipeline
ChannelPipeline pipeline = ch.pipeline();
//加入相关handler
pipeline.addLast("decoder", new StringDecoder());
pipeline.addLast("encoder", new StringEncoder());
//加入自定义的handler
pipeline.addLast(new GroupChatClientHandler());
}
});

ChannelFuture channelFuture = bootstrap.connect(host, port).sync();
//得到channel
Channel channel = channelFuture.channel();
System.out.println("-------" + channel.localAddress()+ "--------");
//客户端需要输入信息,创建一个扫描器
Scanner scanner = new Scanner(System.in);
while (scanner.hasNextLine()) {
String msg = scanner.nextLine();
//通过channel 发送到服务器端
channel.writeAndFlush(msg + "\r\n");
}
}finally {
group.shutdownGracefully();
}
}

public static void main(String[] args) throws Exception {
new GroupChatClient("127.0.0.1", 7000).run();
}
}

  • 编写客户端处理器

public class GroupChatClientHandler extends SimpleChannelInboundHandler<String> {
@Override
protected void channelRead0(ChannelHandlerContext ctx, String msg) throws Exception {
System.out.println(msg.trim());
}
}

  • 先启动服务端,再启动客户端测试

# 服务端控制台
netty 服务器启动
/127.0.0.1:59224 上线了~

# 客户端控制台
-------/127.0.0.1:59224--------



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