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
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;
}
@Override
protected 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;
}
@Override
protected 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;
@Override
public 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