Springboot+Netty

目录

一、netty入门

二、启动方式

三、netty服务启动类

四、handler链

五、具体业务

六、 线程或者非spring管理的bean中获取spring管理的bean

七、效果

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一、netty入门

                   Netty-导学_哔哩哔哩_bilibili

                   入门视频量比较大，最主要是了解netty的架构

netty官网：

    Netty.docs: User guide for 4.x

对springboot有入门级别会启动项目设置bean基本就可以完成了

maven依赖

    <parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.6.7</version><relativePath/></parent>    
<properties><maven.compiler.source>8</maven.compiler.source><maven.compiler.target>8</maven.compiler.target><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding></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>4.1.95.Final</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><scope>provided</scope></dependency><dependency><groupId>com.google.code.gson</groupId><artifactId>gson</artifactId><version>2.10.1</version></dependency><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId></dependency><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-generator</artifactId><version>3.5.1</version></dependency><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-extension</artifactId><version>3.5.3.1</version></dependency><dependency><groupId>org.freemarker</groupId><artifactId>freemarker</artifactId><version>2.3.31</version></dependency><dependency><groupId>commons-io</groupId><artifactId>commons-io</artifactId><version>2.11.0</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-redis</artifactId></dependency><dependency><groupId>com.github.ben-manes.caffeine</groupId><artifactId>caffeine</artifactId></dependency><dependency><groupId>org.apache.commons</groupId><artifactId>commons-pool2</artifactId></dependency><dependency><groupId>commons-codec</groupId><artifactId>commons-codec</artifactId><version>1.15</version></dependency><dependency><groupId>org.apache.commons</groupId><artifactId>commons-lang3</artifactId><version>3.12.0</version></dependency><dependency><groupId>org.apache.commons</groupId><artifactId>commons-collections4</artifactId><version>4.4</version></dependency></dependencies></project>

二、启动方式

   以web方式启动，tomcat占用80端口    netty占用9002端口

import com.xnetty.config.NettyServer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;/*** description: 以web的方式进行项目启动*/
@SpringBootApplication
@Slf4j
public class XNettyApplication {public static void main(String[] args) throws Exception {ApplicationContext context = SpringApplication.run(XNettyApplication.class, args);NettyServer nettyServer = context.getBean(NettyServer.class);nettyServer.start();log.info("XNettyApplication finish start....");}
}

属性配置文件application.properties中配置

server.port=80
netty.server.port=9002

三、netty服务启动类

import io.netty.bootstrap.ServerBootstrap;
import io.netty.buffer.ByteBufAllocator;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelOption;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.stereotype.Component;/*** description:*/
@Component
@Slf4j
public class NettyServer {public void start() throws Exception {ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();executor.setCorePoolSize(8);executor.setMaxPoolSize(200);executor.setQueueCapacity(10000);executor.setKeepAliveSeconds(60);executor.setRejectedExecutionHandler((r, executor1) -> {try {executor1.getQueue().put(r);log.info("执行了拒绝策略.....");} catch (InterruptedException e) {log.error("加入队列异常:{}", e.getMessage());}});executor.setThreadGroupName("netty_request");executor.initialize();NioEventLoopGroup bossGroup = new NioEventLoopGroup(16);NioEventLoopGroup workGroup = new NioEventLoopGroup(16);try {ChannelFuture channelFuture = new ServerBootstrap().group(bossGroup, workGroup).channel(NioServerSocketChannel.class).handler(new LoggingHandler(LogLevel.INFO)).option(ChannelOption.ALLOCATOR, ByteBufAllocator.DEFAULT).childHandler(new ServerInit(executor)).bind("0.0.0.0", port).sync();Channel channel = channelFuture.channel();channel.closeFuture().sync();} finally {bossGroup.shutdownGracefully();workGroup.shutdownGracefully();}}@Value("${netty.server.port}")private int port;}

四、handler链

import com.xnetty.service.ReadRequestHandler;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpServerCodec;
import io.netty.handler.timeout.IdleStateHandler;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.stereotype.Service;import java.util.concurrent.TimeUnit;/*** description:*/
@Service
public class ServerInit extends ChannelInitializer<NioSocketChannel> {private ThreadPoolTaskExecutor executor;public ServerInit(ThreadPoolTaskExecutor executor) {this.executor = executor;}@Overrideprotected void initChannel(NioSocketChannel ch) throws Exception {ch.pipeline().addLast(new IdleStateHandler(0, 0, 30 * 3, TimeUnit.SECONDS)).addLast(new HttpServerCodec()).addLast(new HttpObjectAggregator(5 * 1024 * 1024)) //大小为10M.addLast(new MpHandler(executor));}
}

五、具体业务

import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.*;
import io.netty.util.CharsetUtil;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;/*** description:*/
public class MpHandler extends SimpleChannelInboundHandler<FullHttpRequest> {ThreadPoolTaskExecutor executor;public MpHandler(ThreadPoolTaskExecutor executor) {this.executor = executor;}@Overrideprotected void channelRead0(ChannelHandlerContext ctx, FullHttpRequest request) throws Exception {String uri = request.uri();if (uri.equals("/hello")) {executor.execute(()->{FullHttpResponse response = new DefaultFullHttpResponse(request.protocolVersion(), HttpResponseStatus.OK, Unpooled.copiedBuffer("hello word", CharsetUtil.UTF_8));   //  Unpooled.wrappedBuffer(responseJson)response.headers().set(HttpHeaderNames.CONTENT_TYPE, "application/json;charset=UTF-8");       // HttpHeaderValues.TEXT_PLAIN.toString()response.headers().set(HttpHeaderNames.CONTENT_LENGTH, response.content().readableBytes());if (HttpUtil.isKeepAlive(request)) {response.headers().set(HttpHeaderNames.CONNECTION, HttpHeaderValues.KEEP_ALIVE);}ctx.writeAndFlush(response);});} else {executor.execute(() -> {FullHttpResponse response = new DefaultFullHttpResponse(request.protocolVersion(), HttpResponseStatus.OK, Unpooled.copiedBuffer("请求成功....", CharsetUtil.UTF_8));   //  Unpooled.wrappedBuffer(responseJson)response.headers().set(HttpHeaderNames.CONTENT_TYPE, "application/json;charset=UTF-8");       // HttpHeaderValues.TEXT_PLAIN.toString()response.headers().set(HttpHeaderNames.CONTENT_LENGTH, response.content().readableBytes());if (HttpUtil.isKeepAlive(request)) {response.headers().set(HttpHeaderNames.CONNECTION, HttpHeaderValues.KEEP_ALIVE);}ctx.writeAndFlush(response);});}}
}

六、 线程或者非spring管理的bean中获取spring管理的bean

至于如何在非spring管理的bean中获取spring管理的对象或者在线程中获取spring管理的bean，则自定义一个beanutils获取

如下

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;@Component
public class SpringBeanUtils implements ApplicationContextAware {private static ApplicationContext context;@Overridepublic void setApplicationContext(ApplicationContext applicationContext) throws BeansException {context = applicationContext;}public static Object getBean(String name) {return context.getBean(name);}public static <T> T getBean(Class<T> clazz) {return context.getBean(clazz);}public static <T> T getBeanByName(String beanName, Class<T> clazz) {return context.getBean(beanName, clazz);}}

七、效果

七http://localhost:9002/hello