springboot2.0以上开启异步执行和自定义线程池配置

springboot2.0 以上项目开启异步支持 以下是关键代码

package com.xsrt.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.ThreadPoolExecutor;

@Configuration
@EnableAsync
public class AsyncConfig {
          
   

    @Bean("threadPoolTaskExecutor")
    public ThreadPoolTaskExecutor threadPoolTaskExecutor(){
          
   
        ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
        taskExecutor.setCorePoolSize(Runtime.getRuntime().availableProcessors()*2);
        taskExecutor.setMaxPoolSize(60);
        taskExecutor.setQueueCapacity(20000);
        taskExecutor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        taskExecutor.setThreadGroupName("Task-");
        taskExecutor.setThreadNamePrefix("Async-");
        taskExecutor.setBeanName("threadPoolTaskExecutor");
        return taskExecutor;
    }
}

如果代码中需要多个线程池，可以按照如下方式配置

package com.xsrt.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.ThreadPoolExecutor;

@Configuration
@EnableAsync
public class AsyncConfig {
          
   

    @Bean("threadPoolTaskExecutor")
    @Primary //指定当前线程池为主线程池
    public ThreadPoolTaskExecutor threadPoolTaskExecutor(){
          
   
        ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
        taskExecutor.setCorePoolSize(Runtime.getRuntime().availableProcessors()*2);
        taskExecutor.setMaxPoolSize(60);
        taskExecutor.setQueueCapacity(2000);
        taskExecutor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        taskExecutor.setThreadGroupName("Task-");
        taskExecutor.setThreadNamePrefix("Async-");
        taskExecutor.setBeanName("threadPoolTaskExecutor");
        return taskExecutor;
    }


    @Bean("threadPool")//其他线程池
    public ThreadPoolTaskExecutor threadPool(){
          
   
        ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
        taskExecutor.setCorePoolSize(Runtime.getRuntime().availableProcessors()*2);
        taskExecutor.setMaxPoolSize(60);
        taskExecutor.setQueueCapacity(200);
        taskExecutor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        taskExecutor.setThreadGroupName("Task-");
        taskExecutor.setThreadNamePrefix("Pool-");
        taskExecutor.setBeanName("threadPoolTaskExecutor");
        return taskExecutor;
    }
}

异步方法调用如下

package com.ccbobe.websocket.async;

import lombok.extern.slf4j.Slf4j;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Service;
@Slf4j
@Service
public class AsyncService {
          
   

    @Async
    public String asyncPrimary(){
          
   
      log.info("执行 Primary 异步......");
      return null;
    }

    @Async("threadPool")
    public String asyncPools(){
          
   
        log.info("执行 threadPool 异步......");
        return null;
    }
}

注意事项:使用@Async 注解时，需要注意一下几点 1 当项目中只有一个线程池时，我们只需要写 @Async 即可将需要异步的方法进行异步； 2 当项目中存在多个线程池，我们在写异步时，需要注意如果只写@Async注解没有任何属性则将此方法的执行异步到带有 @Primary 注解修饰的线程池中执行。 3 还可以将方法异步到指定的线程池中，如 @Async(“threadPool”)则是将此方法异步到threadPool 线程池中执行。