服务端
public class YzxServerHandler extends SimpleChannelInboundHandler {
//public static List channels = new ArrayList();
//使用一个hashmap 管理不能自动管理没给加入的channel
//public static Map channels = new HashMap();
//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");
@Override
public void channelActive(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");
///将当前channel 加入到 channelGroup
channelGroup.add(channel);
//提示 xx上线
System.out.println(ctx.channel().remoteAddress() + " 上线了~");
}
@Override
public void channelInactive(ChannelHandlerContext ctx) throws Exception {
Channel channel = ctx.channel();
//将xx客户离开信息推送给当前在线的客户
channelGroup.writeAndFlush("[客户端]" + channel.remoteAddress() + " 离开了\n");
System.out.println("channelGroup size" + channelGroup.size());
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();
}
}
public class YzxServer {
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() {
@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 YzxServerHandler());
}
});
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();
}
}
客户端
public class YzxClientHandler extends SimpleChannelInboundHandler {
@Override
protected void channelRead0(ChannelHandlerContext ctx, String msg) throws Exception {
System.out.println(msg.trim());
}
}
public class YzxClient {
//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() {
@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 YzxClientHandler());
}
});
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();
}
}
服务端
YzxServerHandler
//HttpObject 是HttpServerCodec 编-解码后,客户端和服务器端相互通讯的数据被封装成 HttpObject
public class YzxServerHandler extends SimpleChannelInboundHandler {
//channelRead0 读取客户端数据
@Override
protected void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception {
System.out.println("对应的channel=" + ctx.channel() + " pipeline=" + ctx
.pipeline() + " 通过pipeline获取channel" + ctx.pipeline().channel());
System.out.println("当前ctx的handler=" + ctx.handler());
//判断 msg 是不是 httprequest请求
if(msg instanceof HttpRequest) {
System.out.println("msg 类型=" + msg.getClass());
System.out.println("客户端地址" + ctx.channel().remoteAddress());
//获取到
HttpRequest httpRequest = (HttpRequest) msg;
//获取uri, 过滤指定的资源
URI uri = new URI(httpRequest.uri());
if("/favicon.ico".equals(uri.getPath())) {
System.out.println("请求了 favicon.ico, 不做响应");
return;
}
//回复信息给浏览器 [http协议]
ByteBuf content = Unpooled.copiedBuffer("hello, 我是服务器", CharsetUtil.UTF_8);
//构造一个http的相应,即 httpresponse
FullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK, content);
response.headers().set(HttpHeaderNames.CONTENT_TYPE, "text/plain");
response.headers().set(HttpHeaderNames.CONTENT_LENGTH, content.readableBytes());
//将构建好 response返回
ctx.writeAndFlush(response);
}
}
}
YzxServer
public class YzxServer {
public static void main(String[] args) throws Exception {
EventLoopGroup bossGroup = new NioEventLoopGroup(1);
EventLoopGroup workerGroup = new NioEventLoopGroup();
try {
ServerBootstrap serverBootstrap = new ServerBootstrap();
serverBootstrap.group(bossGroup, workerGroup).channel(NioServerSocketChannel.class).childHandler(new ChannelInitializer(){
@Override
protected void initChannel(SocketChannel ch) throws Exception {
ChannelPipeline pipeline = ch.pipeline();
//HttpServerCodec 是netty 提供的处理http的 编-解码器
pipeline.addLast(new HttpServerCodec());
//2. 增加一个自定义的handler
pipeline.addLast(new YzxServerHandler());
}
});
ChannelFuture channelFuture = serverBootstrap.bind(6668).sync();
channelFuture.channel().closeFuture().sync();
}finally {
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
}
}
}
服务端
//TextWebSocketFrame 类型,表示一个文本帧(frame)
public class YzxServerHandler extends SimpleChannelInboundHandler{
@Override
protected void channelRead0(ChannelHandlerContext ctx, TextWebSocketFrame msg) throws Exception {
System.out.println("服务器收到消息 " + msg.text());
//回复消息
ctx.channel().writeAndFlush(new TextWebSocketFrame("服务器时间" + LocalDateTime.now() + " " + msg.text()));
}
//当web客户端连接后, 触发方法
@Override
public void ChannelActive(ChannelHandlerContext ctx) throws Exception {
//id 表示唯一的值,LongText 是唯一的 ShortText 不是唯一
System.out.println("handlerAdded 被调用" + ctx.channel().id().asLongText());
System.out.println("handlerAdded 被调用" + ctx.channel().id().asShortText());
}
@Override
public void ChannelInActive(ChannelHandlerContext ctx) throws Exception {
System.out.println("handlerRemoved 被调用" + ctx.channel().id().asLongText());
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
System.out.println("异常发生 " + cause.getMessage());
ctx.close(); //关闭连接
}
}
public class YzxServer {
public static void main(String[] args) throws Exception{
//创建两个线程组
EventLoopGroup bossGroup = new NioEventLoopGroup(1);
EventLoopGroup workerGroup = new NioEventLoopGroup(); //8个NioEventLoop
try {
ServerBootstrap serverBootstrap = new ServerBootstrap();
serverBootstrap.group(bossGroup, workerGroup);
serverBootstrap.channel(NioServerSocketChannel.class);
serverBootstrap.handler(new LoggingHandler(LogLevel.INFO));
serverBootstrap.childHandler(new ChannelInitializer() {
@Override
protected void initChannel(SocketChannel ch) throws Exception {
ChannelPipeline pipeline = ch.pipeline();
//因为基于http协议,使用http的编码和解码器
pipeline.addLast(new HttpServerCodec());
//是以块方式写,添加ChunkedWriteHandler处理器
pipeline.addLast(new ChunkedWriteHandler());
//http数据在传输过程中是分段, HttpObjectAggregator就是可以将多个段聚合,所以当浏览器发送大量数据时,就会发出多次http请求
pipeline.addLast(new HttpObjectAggregator(8192));
//WebSocketServerProtocolHandler 核心功能是通过状态码 101将 http协议升级为 ws协议 , 保持长连接
//浏览器请求时 ws://localhost:7000/hello 表示请求的uri
pipeline.addLast(new WebSocketServerProtocolHandler("/hello"));
//自定义的handler ,处理业务逻辑
pipeline.addLast(new YzxServerHandler ());
}
});
//启动服务器
ChannelFuture channelFuture = serverBootstrap.bind(7000).sync();
channelFuture.channel().closeFuture().sync();
}finally {
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
}
}
}