Spring boot 多线程两种方式

最简单的Runnable 之类的不再赘述。

第一种：spring封装的线程池

• 首先定义配置类，这个配置类需要实现AsyncConfiguer接口，并实现它的方法

1. 异步线程的执行者，在里面配置自动执行的东西，比如线程池参数
2. 线程异常处理

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.aop.interceptor.AsyncUncaughtExceptionHandler;
import org.springframework.aop.interceptor.SimpleAsyncUncaughtExceptionHandler;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.AsyncConfigurer;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;

/**
 * Created with IntelliJ IDEA.
 * http://ichenqiang.com
 *
 * @author iChenQiang
 * @version 1.0
 * @Date: 2019/7/16 14:18
 * @Description:
 */
@Configuration
@EnableAsync
public class ExecutorConfig implements AsyncConfigurer {

    private static final Logger logger = LoggerFactory.getLogger(ExecutorConfig.class);

    /**
     * TODO: 此方法名称为asyncPromiseExecutor，即在spring中注入了一个名字为asyncPromiseExecutor的bean
     * 方法名只要在项目中唯一性，可以适当任意取（最好遵循一定的规则）
     * 使用方法：在需要加入线程池的方法上增加注解@Async("asyncPromiseExecutor")就可以加入此线程池异步执行
     */
    @Bean
    public Executor asyncPromiseExecutor() {
        logger.info("Starting AsyncPromiseExecutor!");
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        //配置核心线程数
        executor.setCorePoolSize(Runtime.getRuntime().availableProcessors());
        //最大线程数量
        executor.setMaxPoolSize(Runtime.getRuntime().availableProcessors() * 5);
        //线程池的队列容量
        executor.setQueueCapacity(Runtime.getRuntime().availableProcessors() * 5);
//        executor.setCorePoolSize(5);
//        executor.setMaxPoolSize(20);
//        executor.setQueueCapacity(30);
        executor.setThreadNamePrefix("fastcloud-kingdm-");
        /**
         * rejection-policy：当pool已经达到max size的时候，如何处理新任务
         * CALLER_RUNS：不在新线程中执行任务，而是有调用者所在的线程来执行
         */
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        //初始化执行器
        executor.initialize();
        return executor;
    }

    /*异步任务中异常处理*/
    @Override
    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
        return new SimpleAsyncUncaughtExceptionHandler();
    }
}

• 创建线程任务执行类

import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Component;

@Component
public class TreadTasks {
    @Async
    public void startMyTreadTask() {
        System.out.println("this is my async task");
    }
}

• 调用异步线程任务

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;

import ds.watsons.app.label.service.TreadTasks;

@Controller
public class AsyncTaskUse {
    @Autowired
    private TreadTasks treadTasks;
    @GetMapping("/startMysync")
    public void useMySyncTask() {
        treadTasks.startMyTreadTask();
    }
}

第二种：异步处理最简单的代码

public void test(){
     new Thread(()->doReplace(replaceLog)).start();
} 

public void doReplace(String replaceLog){
    //异步处理的业务 
}