多线程操作UDP接收文件件包(一)

多线程操作UDP接收文件件包(一)

首先了解几个概念：

ThreadPoolTaskExecutor与ThreadPoolExecutor的区别：

ThreadPoolTaskExecutor是spring core包中的，而ThreadPoolExecutor是JDK中的JUC。ThreadPoolTaskExecutor是对ThreadPoolExecutor进行了封装处理

@Async

@Async注解使用条件：指定执行线程池，当其被标注在类或者方法上，用于实现方法的异步执行，当被标注在类上，表明类中的所有方法都被指定的异步执行器执行
@Async注解一般用在类的方法上，如果用在类上，那么这个类所有的方法都是异步执行的；
所使用的@Async注解方法的类对象应该是Spring容器管理的bean对象；
调用异步方法类上需要配置上注解@EnableAsync

① 我们先准备个线程池，供UDP调用：

属性类

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.NoArgsConstructor;
import org.springframework.boot.context.properties.ConfigurationProperties;
import java.util.concurrent.RejectedExecutionHandler;
import java.util.concurrent.ThreadPoolExecutor;
@Data
@EqualsAndHashCode
@NoArgsConstructor
@AllArgsConstructor
@ConfigurationProperties(prefix = "threadpool",ignoreInvalidFields = true)
public class ThreadPoolProperties {
     
    private int corePoolSize=5;
    private int keepAliveSeconds = 60;
    private int maxPoolSize=Runtime.getRuntime().availableProcessors();
    private int queueuCapacity=25;
    private String threadNamePrefix="dachao-";
    private Class<? extends RejectedExecutionHandler> rejectedExecutionHandler = ThreadPoolExecutor.CallerRunsPolicy.class;
}

线程池配置类

import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import java.util.concurrent.Executor;
import java.util.concurrent.RejectedExecutionHandler;

@Configuration
@EnableAsync
@EnableConfigurationProperties({
     ThreadPoolProperties.class})
public class ExecutorConfig {
     
    @Autowired
    private ThreadPoolProperties threadPoolProperties;
    public ExecutorConfig(){
     
    }
    @Bean("getasyncserviceexecutor")
    public Executor asyncServiceExecutor(){
     
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(this.threadPoolProperties.getCorePoolSize());
        executor.setKeepAliveSeconds(this.threadPoolProperties.getKeepAliveSeconds());
        executor.setMaxPoolSize(this.threadPoolProperties.getMaxPoolSize());
        executor.setThreadNamePrefix(this.threadPoolProperties.getThreadNamePrefix());
        RejectedExecutionHandler handler =
                (RejectedExecutionHandler) BeanUtils.instantiateClass(this.threadPoolProperties.getRejectedExecutionHandler());
        executor.setRejectedExecutionHandler(handler);
        return executor;
    }
}

② 我们正式进入UDP部分
一、我们先写一个类，在系统启动执行，多线程启动UDP服务端

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
@Slf4j
public class UdpRunner implements InitializingBean {
     
    @Autowired
    private UDPProcess udpProcess;
    @Override
    public void afterPropertiesSet() throws Exception {
     
        new Thread(udpProcess).start();
    }
}

二、写一个UDP服务器端（最主要的类）

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;

@Component
@Slf4j
public class UDPProcess implements Runnable {
     
	/***
	*这里的端口配置在yml里面（这个随项目需求而配置，非固定）
	*port 9999   maxudpdatasize  8192
	**/
    @Value("${udp.port}")
    private Integer port;
    @Value("${udp.maxudpdatasize}")
    private Integer maxUdpDataSize;
    private DatagramSocket socket;
    @Autowired
    private Process process;
    @Override
    public void run() {
     
        try {
     
            log.info("========当前启动线程：{}=========",Thread.currentThread().getName());
            this.socket = new DatagramSocket(port);
            log.info("=========UDP连接成功，占用端口:{}=========", socket.getLocalPort());
        } catch (SocketException e) {
     
            e.printStackTrace();
            log.error("=========UDP连接失败=========");
        }
        log.info("=========创建数据包，用于接收客户端数据=========");
        while (true) {
     
            byte[] buffer = new byte[maxUdpDataSize];
            DatagramPacket packet = new DatagramPacket(buffer, buffer.length);
            log.info("=========等待接收UDP数据包=========");
            try {
     
                socket.receive(packet);
                process.processRun(packet);
            } catch (IOException e) {
     
                log.info("=========接收UDP数据包失败！=========");
                e.printStackTrace();
            }
        }
    }
}

三、接收的数据处理类，这里使用@Async(“getasyncserviceexecutor”)获取多线程异步推送数据

package com.sinux.cete.socket.udp;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.sinux.cete.socket.socketio.entity.PushMessage;
import com.sinux.cete.socket.socketio.service.ISocketIOService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Component;

import java.io.UnsupportedEncodingException;
import java.net.DatagramPacket;
/**
 * @author Admin
 */
@Component
@Slf4j
public class Process {
     
    @Autowired
    private ISocketIOService socketIOService;
    @Async("getasyncserviceexecutor")
    public void processRun(DatagramPacket packet) {
     
        byte[] buffer = packet.getData();
        try {
     
            String jsonString = new String(buffer,"UTF-8");
            log.info("=====从{}:{}接收到UDP数据包:{}==================",packet.getAddress().getHostAddress(),packet.getPort(),jsonString);
            //TODO 使用SOCKET.IO推送数据
            //1.2 将json字符串转成Person对象
            //Person person = JSONArray.parseObject(json, Person.class);
            PushMessage pushMessage = JSONArray.parseObject(jsonString,PushMessage.class);
            socketIOService.pushMessageToUser(pushMessage);

        } catch (UnsupportedEncodingException e) {
     
            e.printStackTrace();
        }
    }
}

四、可以写个测试类，用于本地测试（也可不写，非必须）模拟发送数据，只要知道UDP服务端启动的ip和端口就可以发送数据过去

package com.sinux.cete.socket.udp;


import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.sinux.cete.socket.socketio.entity.PushMessage;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.util.concurrent.TimeUnit;


/**
 * @author Admin
 */
public class UdpClient {
     
    public static void main(String[] args) {
     
        try {
     
            DatagramSocket socket = new DatagramSocket();
            int i = 1;
            while(true){
     
                System.out.println("早安，中国"+i);
                PushMessage pushMessage = new PushMessage();
                pushMessage.setName("东方不败！");
                pushMessage.setAge(12);
                pushMessage.setBalance(2222L);
                pushMessage.setPhone("12312312312");
                pushMessage.setIp("23423");
                Object obj = JSONArray.toJSON(pushMessage);
                String s= obj.toString();
                byte[] buffer = (s).getBytes("UTF-8");
                DatagramPacket packet = new DatagramPacket(buffer,buffer.length, InetAddress.getByName("localhost"),9999);
                socket.send(packet);
                i++;
                TimeUnit.SECONDS.sleep(1);
            }
        } catch (Exception e) {
     
            e.printStackTrace();
        }
    }
}

注意：udp是启动在它自己的端口（例如我们设定为9999 ）而不是本项目的端口
结构图：