Java netty发送接收（TCP、UDP）
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依赖
<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-all</artifactId>
</dependency>yml配置
gps:
netty:
tcp:
port: 8888
read-timeout: 15 #读超时 15分钟
udp:
port: 7777
threads:
boss: 1
worker: 4
business:
num: 1 #业务线程数量
max-pending: 100000配置类
@Configuration
public class EventLoopGroupConfig {
@Value("${gps.netty.threads.boss}")
private int bossNum;
@Value("${gps.netty.threads.worker}")
private int workerNum;
@Value("${gps.netty.threads.business.num}")
private int businessNum;
@Value("${gps.netty.threads.business.max-pending}")
private int maxPending;
/** * TCP连接处理
* @return
*/
@Bean(name = "bossGroup")
public NioEventLoopGroup bossGroup() {
return new NioEventLoopGroup(bossNum);
}
/** * Socket数据读写
* @return
*/
@Bean(name = "workerGroup")
public NioEventLoopGroup workerGroup() {
return new NioEventLoopGroup(workerNum);
}
/** * Handler业务处理
* @return
*/
@Bean(name = "businessGroup")
public EventExecutorGroup businessGroup() {
return new DefaultEventExecutorGroup(businessNum,new BusinessThreadFactory(),maxPending, RejectedExecutionHandlers.reject());
}
static class BusinessThreadFactory implements ThreadFactory {
private final ThreadGroup group;
private final AtomicInteger threadNumber = new AtomicInteger(1);
private final String namePrefix;
BusinessThreadFactory() {
SecurityManager s = System.getSecurityManager();
group = (s != null) ? s.getThreadGroup() :
Thread.currentThread().getThreadGroup();
namePrefix = "business-thread-";
}
@Override
public Thread newThread(Runnable r) {
Thread t = new Thread(group, r,
namePrefix + threadNumber.getAndIncrement(),
0);
if (t.isDaemon()){
t.setDaemon(false);
}
if (t.getPriority() != Thread.NORM_PRIORITY){
t.setPriority(Thread.NORM_PRIORITY);
}
return t;
}
}
}TcpServer
@Slf4j
@Component
public class NettyTcpServer implements ApplicationListener<ApplicationStartedEvent> {
@Value("${gps.netty.tcp.port}")
private int port;
@Value("${gps.netty.tcp.read-timeout}")
private int readTimeOut;
@Autowired
@Qualifier("bossGroup")
private NioEventLoopGroup bossGroup;
@Autowired
@Qualifier("workerGroup")
private NioEventLoopGroup workerGroup;
@Autowired
@Qualifier("businessGroup")
private EventExecutorGroup businessGroup;
@Autowired
private TcpServerHandler tcpServerHandler;
/** * 启动Server
* */
@Override
public void onApplicationEvent(ApplicationStartedEvent event) {
try {
ServerBootstrap serverBootstrap = new ServerBootstrap();
serverBootstrap.group(bossGroup, workerGroup)
.channel(NioServerSocketChannel.class)
.childHandler(new ChannelInitializer<SocketChannel>() { //
@Override
public void initChannel(SocketChannel ch) throws Exception {
ch.pipeline().addLast(new IdleStateHandler(readTimeOut, 0, 0, TimeUnit.MINUTES));
// 1024表示单条消息的最大长度，解码器在查找分隔符的时候，达到该长度还没找到的话会抛异常
ch.pipeline().addLast(
new DelimiterBasedFrameDecoder(1024, Unpooled.copiedBuffer(new byte[] { MsgUtil.DELIMITER }),
Unpooled.copiedBuffer(new byte[] { MsgUtil.DELIMITER, MsgUtil.DELIMITER })));
ch.pipeline().addLast(businessGroup,tcpServerHandler);
}
})
.option(ChannelOption.SO_BACKLOG, 1024) //服务端可连接队列数,对应TCP/IP协议listen函数中backlog参数
.childOption(ChannelOption.TCP_NODELAY, true)//立即写出
.childOption(ChannelOption.SO_KEEPALIVE, true);//长连接
ChannelFuture channelFuture = serverBootstrap.bind(port).sync();
if (channelFuture.isSuccess()) {
log.info("TCP服务启动完毕,port={}", port);
}
}catch(Exception e) {
log.info("TCP服务启动失败", e);
}
}
/** * 销毁资源
*/
@PreDestroy
public void destroy() {
bossGroup.shutdownGracefully().syncUninterruptibly();
workerGroup.shutdownGracefully().syncUninterruptibly();
log.info("TCP服务关闭成功");
}
}UdpServer
@Slf4j
@Configuration
public class NettyUdpServer implements ApplicationListener<ApplicationStartedEvent> {
@Value("${gps.netty.udp.port}")
private int port;
@Resource
private UdpServerHandler udpServerHandler;
private EventLoopGroup group = null;
@Override
public void onApplicationEvent(@NonNull ApplicationStartedEvent event) {
try {
Bootstrap b = new Bootstrap();
String osName= SystemPropertyUtil.get("os.name").toLowerCase();
if("linux".equals(osName)) {
group = new EpollEventLoopGroup();
b.group(group)
.channel(EpollDatagramChannel.class);
}else {
group = new NioEventLoopGroup();
b.group(group)
.channel(NioDatagramChannel.class);
}
//广播
b.option(ChannelOption.SO_BROADCAST, true)
//接收缓存区 10M
.option(ChannelOption.SO_RCVBUF, 1024 * 1024 * 10 )
//发送缓存区 10M
.option(ChannelOption.SO_SNDBUF, 1024 * 1024 * 10 )
.handler(udpServerHandler);
ChannelFuture channelFuture = b.bind(port).sync();
if (channelFuture.isSuccess()) {
log.info("UDP服务启动完毕,port={}", port);
}
} catch (InterruptedException e) {
log.info("UDP服务启动失败", e);
}
}
/** * 销毁资源
*/
@PreDestroy
public void destroy() {
if(group!=null) {
group.shutdownGracefully();
}
log.info("UDP服务关闭成功");
}
}TcpHandler
@Slf4j
@ChannelHandler.Sharable
@Component
public class TcpServerHandler extends SimpleChannelInboundHandler<ByteBuf> {
@Autowired
private KafkaSender kafkaSender;
@Autowired
@Qualifier("businessGroup")
private EventExecutorGroup businessGroup;
/** * 使用
* @param ctx
* @param byteBuf
* @throws Exception
*/
@Override
protected void channelRead0(ChannelHandlerContext ctx, ByteBuf byteBuf) {
String content = byteBuf.toString(StandardCharsets.UTF_8);
log.info("TCP服务端接收到消息：{}", content);
ByteBuf buf = Unpooled.copiedBuffer("TCP已经接收到消息：".getBytes(StandardCharsets.UTF_8));
businessGroup.execute(()->{
try {
kafkaSender.sendMessage("hello", content);
send2client(ctx,buf.array());
}catch(Throwable e) {
log.error("TCP数据接收处理出错",e);
ByteBuf err = Unpooled.copiedBuffer("系统错误：".getBytes(StandardCharsets.UTF_8));
send2client(ctx,err.array());
}
});
}
@Override
public void channelReadComplete(ChannelHandlerContext ctx) {
ctx.flush();
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
log.error("TCP数据接收处理出错：",cause);
}
/** * 返回消息给客户端
* @param ctx
* @param msg
*/
void send2client(ChannelHandlerContext ctx, byte[] msg) {
ByteBuf buf= Unpooled.buffer(msg.length+1);
buf.writeBytes(msg);
buf.writeByte(MsgUtil.DELIMITER);
ctx.writeAndFlush(buf).addListener(future->{
if(!future.isSuccess()) {
log.error("TCP发送给客户端消息失败");
}
});
}
}UdpHandler
@ChannelHandler.Sharable
@Component
@Slf4j
public class UdpServerHandler extends SimpleChannelInboundHandler<DatagramPacket> {
@Autowired
@Qualifier("businessGroup")
private EventExecutorGroup businessGroup;
@Autowired
private KafkaSender kafkaSender;
@Override
protected void channelRead0(ChannelHandlerContext ctx, DatagramPacket packet) throws Exception {
String content = packet.content().toString(StandardCharsets.UTF_8);
log.info("UDP服务端接收到消息：{}", content);
ByteBuf buf = Unpooled.copiedBuffer("UDP已经接收到消息：".getBytes(StandardCharsets.UTF_8));
businessGroup.execute(()->{
try {
kafkaSender.sendMessage("hello", content);
ctx.writeAndFlush(new DatagramPacket(buf, packet.sender()));
}catch(Throwable e) {
log.info("UDP数据接收处理出错{}", e);
}
});
}Tcp消息发送
@Slf4j
@RestController
public class TcpClientController {
@Value("${gps.netty.tcp.port}")
private int port;
@PostMapping("sendTcp")
public String send(String msg){
EventLoopGroup group = new NioEventLoopGroup();
Bootstrap b = new Bootstrap();
Channel ch =null;
TcpServerHandler handler=new TcpServerHandler();
try {
b.group(group)
.channel(NioSocketChannel.class)
.handler(new ChannelInitializer<NioSocketChannel>() {
@Override
protected void initChannel(NioSocketChannel ch) throws Exception {
ch.pipeline().addLast(
new DelimiterBasedFrameDecoder(1024, Unpooled.copiedBuffer(new byte[] { 0x7e }),
Unpooled.copiedBuffer(new byte[] { 0x7e, 0x7e })));
ch.pipeline().addLast(handler);
}});
ch =b.connect("localhost", port).sync().channel();
} catch (Exception e) {
e.printStackTrace();
}
ByteBuf tcpMsg = Unpooled.copiedBuffer(msg.getBytes(StandardCharsets.UTF_8));
ByteBuf buf= Unpooled.buffer(msg.length() + 1);
try{
log.info("TCP客户端发送消息：{}", msg);
buf.writeBytes(tcpMsg);//消息体
buf.writeByte(MsgUtil.DELIMITER);//消息分割符
ch.writeAndFlush(buf).sync();
}catch (Exception e){
log.info("TCP客户端发送消息失败：{}", e);
}
//关闭链接
group.shutdownGracefully();
return "success";
}Udp消息发送
@Slf4j
@RestController
public class UdpClientController {
@Value("${gps.netty.udp.port}")
private int port;
@PostMapping("sendUdp")
public String send(String msg){
EventLoopGroup group = new NioEventLoopGroup();
Bootstrap b = new Bootstrap();
Channel ch =null;
UdpServerHandler handler=new UdpServerHandler();
try {
b.group(group)
.channel(NioDatagramChannel.class)
.option(ChannelOption.SO_BROADCAST, true)
.handler(new ChannelInitializer<NioDatagramChannel>() {
@Override
protected void initChannel(NioDatagramChannel ch) throws Exception {
ch.pipeline().addLast(handler.getClass().getSimpleName(),handler);
}});
ch =b.bind(0).sync().channel();
} catch (Exception e) {
e.printStackTrace();
}
ByteBuf buf = Unpooled.copiedBuffer(msg.getBytes(StandardCharsets.UTF_8));
try{
log.info("UDP客户端发送消息：{}", msg);
ch.writeAndFlush(new DatagramPacket(
Unpooled.copiedBuffer(buf.array()),
SocketUtils.socketAddress("localhost", port))).sync();
}catch (Exception e){
log.info("UDP客户端发送消息失败：{}", e);
}
//关闭链接
group.shutdownGracefully();
return "success";
}
}[项目地址
https://gitee.com/x-n/m-g/netty_kafka](https://gitee.com/x-n/m-g/netty_kafka "此项目具体位置")
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