springboot整合netty，多种启动netty的方式，展现bean得多种启动方法

首先讲解下，spring中初始化加载问题：

很多时候，我们自己写的线程池，还有bean对象，还有其他的服务类，都可以通过，相关注解进行交给spring去管理，那么我们如何让nettyserver初始化加载呢：

在springBean的生命周期中有

引入pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.</modelVersion>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>2.2..RELEASE</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

    <groupId>com.cxy</groupId>

    <artifactId>netty</artifactId>

    <version>0.0.-SNAPSHOT</version>

    <name>netty</name>

    <description>Demo project for Spring Boot</description>

    <properties>

        <java.version>1.8</java.version>

    </properties>

    <dependencies>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <dependency>

            <groupId>io.netty</groupId>

            <artifactId>netty-all</artifactId>

            <version>4.1..Final</version>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

            <exclusions>

                <exclusion>

                    <groupId>org.junit.vintage</groupId>

                    <artifactId>junit-vintage-engine</artifactId>

                </exclusion>

            </exclusions>

        </dependency>

    </dependencies>

    <build>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

            </plugin>

        </plugins>

    </build>

</project>

1 InitializingBean 在系统初始化之后加载

package com.cxy.netty.controller;

import org.springframework.beans.factory.InitializingBean;
import org.springframework.stereotype.Controller;

@Controller
public class DemoController implements InitializingBean {

    @Override
    public void afterPropertiesSet() throws Exception {
        System.out.println("系统加载");
    }
}

我们可以看下日志：

"C:\Program Files\Java\jdk1.8.0_191\bin\java.exe" -XX:TieredStopAtLevel= -noverify -Dspring.output.ansi.enabled=always -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port= -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Djava.rmi.server.hostname=localhost -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true "-javaagent:D:\Program Files\JetBrains\ideaIU-2018.1.2.win\lib\idea_rt.jar=9136:D:\Program Files\JetBrains\ideaIU-2018.1.2.win\bin" -Dfile.encoding=UTF- -classpath "C:\Program Files\Java\jdk1.8.0_191\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\rt.jar;D:\工作\idea\netty\target\classes;D:\java\maven\org\springframework\boot\spring-boot-starter-web\2.2.1.RELEASE\spring-boot-starter-web-2.2.1.RELEASE.jar;D:\java\maven\org\springframework\boot\spring-boot-starter\2.2.1.RELEASE\spring-boot-starter-2.2.1.RELEASE.jar;D:\java\maven\org\springframework\boot\spring-boot\2.2.1.RELEASE\spring-boot-2.2.1.RELEASE.jar;D:\java\maven\org\springframework\boot\spring-boot-autoconfigure\2.2.1.RELEASE\spring-boot-autoconfigure-2.2.1.RELEASE.jar;D:\java\maven\org\springframework\boot\spring-boot-starter-logging\2.2.1.RELEASE\spring-boot-starter-logging-2.2.1.RELEASE.jar;D:\java\maven\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;D:\java\maven\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;D:\java\maven\org\apache\logging\log4j\log4j-to-slf4j\2.12.1\log4j-to-slf4j-2.12.1.jar;D:\java\maven\org\apache\logging\log4j\log4j-api\2.12.1\log4j-api-2.12.1.jar;D:\java\maven\org\slf4j\jul-to-slf4j\1.7.29\jul-to-slf4j-1.7.29.jar;D:\java\maven\jakarta\annotation\jakarta.annotation-api\1.3.5\jakarta.annotation-api-1.3.5.jar;D:\java\maven\org\yaml\snakeyaml\1.25\snakeyaml-1.25.jar;D:\java\maven\org\springframework\boot\spring-boot-starter-json\2.2.1.RELEASE\spring-boot-starter-json-2.2.1.RELEASE.jar;D:\java\maven\com\fasterxml\jackson\core\jackson-databind\2.10.0\jackson-databind-2.10.0.jar;D:\java\maven\com\fasterxml\jackson\core\jackson-annotations\2.10.0\jackson-annotations-2.10.0.jar;D:\java\maven\com\fasterxml\jackson\core\jackson-core\2.10.0\jackson-core-2.10.0.jar;D:\java\maven\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.10.0\jackson-datatype-jdk8-2.10.0.jar;D:\java\maven\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.10.0\jackson-datatype-jsr310-2.10.0.jar;D:\java\maven\com\fasterxml\jackson\module\jackson-module-parameter-names\2.10.0\jackson-module-parameter-names-2.10.0.jar;D:\java\maven\org\springframework\boot\spring-boot-starter-tomcat\2.2.1.RELEASE\spring-boot-starter-tomcat-2.2.1.RELEASE.jar;D:\java\maven\org\apache\tomcat\embed\tomcat-embed-core\9.0.27\tomcat-embed-core-9.0.27.jar;D:\java\maven\org\apache\tomcat\embed\tomcat-embed-el\9.0.27\tomcat-embed-el-9.0.27.jar;D:\java\maven\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.27\tomcat-embed-websocket-9.0.27.jar;D:\java\maven\org\springframework\boot\spring-boot-starter-validation\2.2.1.RELEASE\spring-boot-starter-validation-2.2.1.RELEASE.jar;D:\java\maven\jakarta\validation\jakarta.validation-api\2.0.1\jakarta.validation-api-2.0.1.jar;D:\java\maven\org\hibernate\validator\hibernate-validator\6.0.18.Final\hibernate-validator-6.0.18.Final.jar;D:\java\maven\org\jboss\logging\jboss-logging\3.4.1.Final\jboss-logging-3.4.1.Final.jar;D:\java\maven\com\fasterxml\classmate\1.5.1\classmate-1.5.1.jar;D:\java\maven\org\springframework\spring-web\5.2.1.RELEASE\spring-web-5.2.1.RELEASE.jar;D:\java\maven\org\springframework\spring-beans\5.2.1.RELEASE\spring-beans-5.2.1.RELEASE.jar;D:\java\maven\org\springframework\spring-webmvc\5.2.1.RELEASE\spring-webmvc-5.2.1.RELEASE.jar;D:\java\maven\org\springframework\spring-aop\5.2.1.RELEASE\spring-aop-5.2.1.RELEASE.jar;D:\java\maven\org\springframework\spring-context\5.2.1.RELEASE\spring-context-5.2.1.RELEASE.jar;D:\java\maven\org\springframework\spring-expression\5.2.1.RELEASE\spring-expression-5.2.1.RELEASE.jar;D:\java\maven\io\netty\netty-all\4.1.25.Final\netty-all-4.1.25.Final.jar;D:\java\maven\org\slf4j\slf4j-api\1.7.29\slf4j-api-1.7.29.jar;D:\java\maven\org\springframework\spring-core\5.2.1.RELEASE\spring-core-5.2.1.RELEASE.jar;D:\java\maven\org\springframework\spring-jcl\5.2.1.RELEASE\spring-jcl-5.2.1.RELEASE.jar" com.cxy.netty.NettyApplication

  .   ____          _            __ _ _

 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \

( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \

 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )

  '  |____| .__|_| |_|_| |_\__, | / / / /

 =========|_|==============|___/=/_/_/_/

 :: Spring Boot ::        (v2.2.1.RELEASE)

-- ::49.749  INFO  --- [           main] com.cxy.netty.NettyApplication           : Starting NettyApplication on LAPTOP-MEIVCU3E with PID  (started by cxy in D:\工作\idea\netty)

-- ::49.752  INFO  --- [           main] com.cxy.netty.NettyApplication           : No active profile set, falling back to default profiles: default

-- ::50.606  INFO  --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s):  (http)

-- ::50.623  INFO  --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]

-- ::50.623  INFO  --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.]

-- ::50.736  INFO  --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext

-- ::50.737  INFO  --- [           main] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in  ms

系统加载

-- ::50.894  INFO  --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'

-- ::51.029  INFO  --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s):  (http) with context path ''

-- ::51.032  INFO  --- [           main] com.cxy.netty.NettyApplication           : Started NettyApplication in 1.689 seconds (JVM running for 4.137)

打印出了系统加载，这个适合有时候系统停机导致内存中的数据会有少部分丢失，必须要在重启之后才调用相关服务才可以调用，才可以加载缓存，那么这个方法可以很有效的加载在jvm内存的数据

2 注解@PostConstruct

package com.cxy.netty.controller;

import io.netty.bootstrap.ServerBootstrap;

import io.netty.channel.ChannelFuture;

import io.netty.channel.ChannelInitializer;

import io.netty.channel.EventLoopGroup;

import io.netty.channel.nio.NioEventLoopGroup;

import io.netty.channel.socket.SocketChannel;

import io.netty.channel.socket.nio.NioServerSocketChannel;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.boot.autoconfigure.web.ServerProperties;

import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;

import javax.annotation.PreDestroy;

import java.net.InetSocketAddress;

@Component

public class NettyServer {

    private  int port =;

    EventLoopGroup boss = new NioEventLoopGroup();

    EventLoopGroup work = new NioEventLoopGroup();

    @PostConstruct

    public void start() throws Exception {

        System.out.println("启动记载netty");

        ServerBootstrap b = new ServerBootstrap();

        b.group(boss,work)

                .channel(NioServerSocketChannel.class)

                .localAddress(new InetSocketAddress(port))

                .childHandler(new ChannelInitializer<SocketChannel>() {

                    @Override

                    protected void initChannel(SocketChannel ch) throws Exception {

                        ch.pipeline().addLast(new EchoServerHandler());

                    }

                });

        System.out.println("启动加载netty2");

        ChannelFuture channelFuturef = b.bind().sync();

        if (channelFuturef.isSuccess()){

        System.out.println("启动成功");

        }

    }

    @PreDestroy

   private void destory() throws Exception{

        boss.shutdownGracefully();

        work.shutdownGracefully();

        System.out.println("关闭server");

        }

}

启动类：

package com.cxy.netty;

import com.cxy.netty.controller.InitListener;

import com.cxy.netty.controller.NettyServer;

import org.springframework.boot.CommandLineRunner;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.web.servlet.ServletListenerRegistrationBean;

import org.springframework.context.annotation.Bean;

@SpringBootApplication

public class NettyApplication {

    public static void main(String[] args) {

        SpringApplication.run(NettyApplication.class, args);

    }

}

看打印日志：

从这里代码又可以应征笔者之前说的，netty的使用只需要自己写好那个助手类就可以了；

package com.cxy.netty.controller;

import io.netty.buffer.ByteBuf;

import io.netty.channel.ChannelFutureListener;

import io.netty.channel.ChannelHandlerContext;

import io.netty.channel.ChannelInboundHandlerAdapter;

import io.netty.util.CharsetUtil;

public class EchoServerHandler extends ChannelInboundHandlerAdapter {

    @Override

    public void channelRead(ChannelHandlerContext ctx, Object msg){

        ByteBuf in = (ByteBuf) msg;

        System.out.println("Server received: " + in.toString(CharsetUtil.UTF_8));

        ctx.write(in);

    }

    @Override

    public void channelReadComplete(ChannelHandlerContext ctx){

        ctx.writeAndFlush(ChannelFutureListener.CLOSE);

    }

    @Override

    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause){

        cause.printStackTrace();

        ctx.close();

    }

}

@PostConstruct 这个注解，到底是怎么样著有这么神奇的功效呢：

/**

 * The PostConstruct annotation is used on a method that needs to be executed

 * after dependency injection is done to perform any initialization. This

 * method MUST be invoked before the class is put into service. This

 * annotation MUST be supported on all classes that support dependency

 * injection. The method annotated with PostConstruct MUST be invoked even

 * if the class does not request any resources to be injected. Only one

 * method can be annotated with this annotation. The method on which the

 * PostConstruct annotation is applied MUST fulfill all of the following

 * criteria:

看到，表示，某个方法需要初始化的时候，可以使用这个注解：

是作用到方法上面的，使用这个整合时候，需要注意问题，就是，我们需要将整个类交给spring去管理，这样，才可以进行初始化，这个类是在spring的包中，所以需要整合必须要用这个二注解。

3 基础类实现 CommandLineRunner

package com.cxy.netty;

import com.cxy.netty.controller.NettyServer;

import org.springframework.boot.CommandLineRunner;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication

public class NettyApplication implements CommandLineRunner {

    public static void main(String[] args) {

        SpringApplication.run(NettyApplication.class, args);

    }

    @Override

    public void run(String... args) throws Exception {

        NettyServer echoServer = new NettyServer();

        echoServer.start();

    }

}

package com.cxy.netty.controller;

import io.netty.bootstrap.ServerBootstrap;

import io.netty.channel.ChannelFuture;

import io.netty.channel.ChannelInitializer;

import io.netty.channel.EventLoopGroup;

import io.netty.channel.nio.NioEventLoopGroup;

import io.netty.channel.socket.SocketChannel;

import io.netty.channel.socket.nio.NioServerSocketChannel;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.boot.autoconfigure.web.ServerProperties;

import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;

import javax.annotation.PreDestroy;

import java.net.InetSocketAddress;

public class NettyServer {

    private  int port;

    public int getPort() {

        return port;

    }

    public void setPort(int port) {

        this.port = port;

    }

    public NettyServer(int port) {

        this.port = port;

    }

    public void start() throws Exception {

        System.out.println("启动记载netty");

        EventLoopGroup boss = new NioEventLoopGroup();

        EventLoopGroup work = new NioEventLoopGroup();

        ServerBootstrap b = new ServerBootstrap();

        b.group(boss,work)

                .channel(NioServerSocketChannel.class)

                .localAddress(new InetSocketAddress(port))

                .childHandler(new ChannelInitializer<SocketChannel>() {

                    @Override

                    protected void initChannel(SocketChannel ch) throws Exception {

                        ch.pipeline().addLast(new EchoServerHandler());

                    }

                });

        System.out.println("启动加载netty2");

        ChannelFuture channelFuturef = b.bind().sync();

        if (channelFuturef.isSuccess()){

        System.out.println("启动成功");

        }

    }

}

给他初始化的时候，添加启动方法，

看启动日志：

注意事项,在nettyServer上不要加component注解

4 利用 ApplicationListener 上下文监听器

package com.cxy.netty;

import com.cxy.netty.controller.NettyServer;

import org.springframework.context.ApplicationListener;

import org.springframework.context.event.ContextRefreshedEvent;

import org.springframework.stereotype.Component;

@Component

public class NettyBooter implements ApplicationListener<ContextRefreshedEvent> {

    @Override

    public void onApplicationEvent(ContextRefreshedEvent event) {

        NettyServer nettyServer = new NettyServer();

        try {

            nettyServer.start();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

}

package com.cxy.netty;

import com.cxy.netty.controller.NettyServer;

import org.springframework.boot.CommandLineRunner;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication

public class NettyApplication {

    public static void main(String[] args) {

        SpringApplication.run(NettyApplication.class, args);

    }

}

看启动日志：

可以看server也启动了。

5 利用监听器启动：

package com.cxy.netty.controller;

import javax.servlet.ServletContextEvent;

import javax.servlet.ServletContextListener;

/**

 * 系统初始化监听器

 * @author Administrator

 *

 */

public class InitListener implements ServletContextListener {

    @Override

    public void contextInitialized(ServletContextEvent sce) {

        NettyServer nettyServer = new NettyServer();

        try {

            nettyServer.start();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

    @Override

    public void contextDestroyed(ServletContextEvent sce) {

    }

}

package com.cxy.netty;

import com.cxy.netty.controller.InitListener;

import com.cxy.netty.controller.NettyServer;

import org.springframework.boot.CommandLineRunner;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.web.servlet.ServletListenerRegistrationBean;

import org.springframework.context.annotation.Bean;

@SpringBootApplication

public class NettyApplication {

    /**

     * 注册监听器

     * @return

     */

    @SuppressWarnings({ "rawtypes", "unchecked" })

    @Bean

    public ServletListenerRegistrationBean servletListenerRegistrationBean() {

        ServletListenerRegistrationBean servletListenerRegistrationBean =

                new ServletListenerRegistrationBean();

        servletListenerRegistrationBean.setListener(new InitListener());

        return servletListenerRegistrationBean;

    }

    public static void main(String[] args) {

        SpringApplication.run(NettyApplication.class, args);

    }

}

看日志：

springboot整合netty，多种启动netty的方式，展现bean得多种启动方法的更多相关文章

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