SpringBoot集成Netty4并实现JSON字符串的解析处理

一、maven配置

<parent>
    <groupId>org.springframework.bootgroupId>
    <artifactId>spring-boot-starter-parentartifactId>
    <version>1.5.9.RELEASEversion>
    <relativePath />
parent>


<properties>
    <project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8project.reporting.outputEncoding>
    
    <skipTests>trueskipTests>
    <fastjson.version>1.2.31fastjson.version>
    <netty.version>4.1.6.Finalnetty.version>
properties>


<dependencies>
    
    <dependency>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-starter-webartifactId>
    dependency>

    
    <dependency>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-devtoolsartifactId>
        <optional>trueoptional>
        <scope>truescope>
    dependency>

    
    <dependency>
        <groupId>com.alibabagroupId>
        <artifactId>fastjsonartifactId>
        <version>${fastjson.version}version>
    dependency>

    
    <dependency>
        <groupId>io.nettygroupId>
        <artifactId>netty-allartifactId>
        <version>${netty.version}version>
    dependency>
dependencies>

<build>
    <finalName>${project.artifactId}finalName>
    <plugins>
        
        <plugin>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-maven-pluginartifactId>
            <configuration>
                
                <fork>truefork>
            configuration>
        plugin>
    plugins>
build>

二、netty服务端编写

NettyServer

/**
 * netty服务端 . 

 * 
 * @author hkb
 */
@Component
public class NettyServer {

    /**
     * 日志
     */
    private Logger log = LoggerFactory.getLogger(getClass());

    /**
     * 端口号
     */
    @Value("${netty.port}")
    private int port;

    /**
     * 启动服务器方法
     * 
     * @param port
     */
    public void run() {
        EventLoopGroup bossGroup = new NioEventLoopGroup();
        EventLoopGroup workerGroup = new NioEventLoopGroup();
        try {
            ServerBootstrap serverBootstrap = new ServerBootstrap();
            serverBootstrap.group(bossGroup, workerGroup);
            serverBootstrap.channel(NioServerSocketChannel.class);
            serverBootstrap.option(ChannelOption.SO_BACKLOG, 1024);
            serverBootstrap.handler(new LoggingHandler(LogLevel.INFO));
            serverBootstrap.childOption(ChannelOption.TCP_NODELAY, true);
            serverBootstrap.childOption(ChannelOption.SO_KEEPALIVE, true);
            serverBootstrap.childHandler(new NettyServerInitializer());
            // 绑定端口,开始接收进来的连接
            ChannelFuture channelFuture = serverBootstrap.bind(port).sync();
            log.info("netty服务启动: [port:" + port + "]");
            // 等待服务器socket关闭
            channelFuture.channel().closeFuture().sync();
        } catch (Exception e) {
            log.error("netty服务启动异常-" + e.getMessage());
        } finally {
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }
    }

}

NettyServerInitializer

/**
 * 服务端初始化 . 

 * 
 * @author hkb
 */
public class NettyServerInitializer extends ChannelInitializer<SocketChannel> {

    /**
     * 初始化channel
     */
    @Override
    public void initChannel(SocketChannel ch) throws Exception {
        ChannelPipeline pipeline = ch.pipeline();
        pipeline.addLast(new DelimiterBasedFrameDecoder(8192, Delimiters.lineDelimiter()));
        pipeline.addLast(new StringDecoder(CharsetUtil.UTF_8));
        pipeline.addLast(new StringEncoder(CharsetUtil.UTF_8));
        pipeline.addLast(new NettyServerHandler());
    }

}

NettyServerHandler

/**
 * 服务端处理器 . 

 * 
 * @author hkb
 */
public class NettyServerHandler extends SimpleChannelInboundHandler<String> {

    /**
     * 日志
     */
    private Logger log = LoggerFactory.getLogger(getClass());

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, String msg) {
        StringBuilder sb = null;
        Map result = null;
        try {
            // 报文解析处理
            sb = new StringBuilder();
            result = JSON.parseObject(msg);

            sb.append(result);
            sb.append("解析成功");
            sb.append("\n");
            ctx.writeAndFlush(sb);
        } catch (Exception e) {
            String errorCode = "-1\n";
            ctx.writeAndFlush(errorCode);
            log.error("报文解析失败: " + e.getMessage());
        }
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        InetSocketAddress insocket = (InetSocketAddress) ctx.channel().remoteAddress();
        String clientIp = insocket.getAddress().getHostAddress();
        log.info("收到客户端[ip:" + clientIp + "]连接");
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        // 当出现异常就关闭连接
        ctx.close();
    }

}

三、配置netty随tomcat启动

/**
 * netty服务监听器 . 

 * 
 * @author hkb
 */
@WebListener
public class NettyServerListener implements ServletContextListener {

    /**
     * 注入NettyServer
     */
    @Autowired
    private NettyServer nettyServer;

    @Override
    public void contextInitialized(ServletContextEvent sce) {
        Thread thread = new Thread(new NettyServerThread());
        // 启动netty服务
        thread.start();
    }

    @Override
    public void contextDestroyed(ServletContextEvent sce) {

    }

    /**
     * netty服务启动线程 . 

     * 
     * @author hkb
     */
    private class NettyServerThread implements Runnable {

        @Override
        public void run() {
            nettyServer.run();
        }
    }

}

四、netty客户端测试

NettyClient

/**
 * netty客户端 . 

 * 
 * @author hkb
 */
public class NettyClient {

    /**
     * 主机
     */
    private String host;

    /**
     * 端口号
     */
    private int port;

    /**
     * 构造函数
     * 
     * @param host
     * @param port
     */
    public NettyClient(String host, int port) {
        this.host = host;
        this.port = port;
    }

    /**
     * 连接方法
     */
    public void connect() {
        EventLoopGroup group = new NioEventLoopGroup();
        try {
            Bootstrap bootstrap = new Bootstrap();
            bootstrap.group(group).channel(NioSocketChannel.class);
            bootstrap.option(ChannelOption.TCP_NODELAY, true);
            // bootstrap.option(ChannelOption.SO_KEEPALIVE, true);
            bootstrap.handler(new NettyClientInitializer());
            Channel channel = bootstrap.connect(host, port).sync().channel();
            // 发送json字符串
            String msg = "{\"name\":\"admin\",\"age\":27}\n";
            channel.writeAndFlush(msg);
            channel.closeFuture().sync();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            group.shutdownGracefully();
        }
    }

    /**
     * 测试入口
     * 
     * @param args
     */
    public static void main(String[] args) {
        String host = "127.0.0.1";
        int port = 8088;
        NettyClient nettyClient = new NettyClient(host, port);
        nettyClient.connect();
    }

}

NettyClientInitializer

/**
 * 客户端初始化 . 

 * 
 * @author hkb
 */
public class NettyClientInitializer extends ChannelInitializer<SocketChannel> {

    /**
     * 初始化channel
     */
    @Override
    public void initChannel(SocketChannel ch) throws Exception {
        ChannelPipeline pipeline = ch.pipeline();
        pipeline.addLast(new DelimiterBasedFrameDecoder(8192, Delimiters.lineDelimiter()));
        pipeline.addLast(new StringDecoder(CharsetUtil.UTF_8));
        pipeline.addLast(new StringEncoder(CharsetUtil.UTF_8));
        pipeline.addLast(new NettyClientHandler());
    }
}

NettyClientHandler

/**
 * 客户端处理器 . 

 * 
 * @author hkb
 */
public class NettyClientHandler extends SimpleChannelInboundHandler<String> {

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, String msg) throws Exception {
        System.out.println("收到服务端消息: " + msg);
    }
}

五、运行结果

服务端

客户端