Spring 使用 @Async 捕获异常

版权声明：“假装、是个有灵魂的程序员” —— Go Big Or Go Home https://blog.csdn.net/u011663149/article/details/88788259

---

前言：

    在使用Spring项目使用@Async注释时捕获异常。 当多个线程进行任务异步调用出现异常时，解决方案非常简单，需要注入自己的Exception处理程序，以便在执行@Async方法时捕获到异常。

1. AsyncConfigurer : AsyncConfigurer是Spring提供的接口，它提供了两种方法，一种是覆盖TaskExecutor（Threadpool），另一种是异常处理程序，你可以在其中注入异常处理程序，以便捕获未捕获的异常。您可以创建自己的类并直接实现该类。但我不会这样做，作为替代方案，我将使用Spring AsyncConfigurerSupport类，它由@Configuration和@EnableAsync注释，并提供默认实现。

import java.lang.reflect.Method;
import java.util.concurrent.Executor;

import org.springframework.aop.interceptor.AsyncUncaughtExceptionHandler;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.task.SimpleAsyncTaskExecutor;
import org.springframework.lang.Nullable;
import org.springframework.scheduling.annotation.AsyncConfigurerSupport;
import org.springframework.scheduling.annotation.EnableAsync;


/**
*自定义ExceptionHandler配置
*/
@Configuration
@EnableAsync
public class CustomConfiguration extends AsyncConfigurerSupport {

    @Override
    public Executor getAsyncExecutor() {
        return new SimpleAsyncTaskExecutor();
    }


    @Override
    @Nullable
    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
    //lambda表达式用作异常处理程序
        return (throwable, method, obj)->{
            System.out.println("Exception Caught in Thread - " +         Thread.currentThread().getName());
            System.out.println("Exception message - " + throwable.getMessage());
            System.out.println("Method name - " + method.getName());
        for (Object param : obj) {
            System.out.println("Parameter value - " + param);
        }
};
}

}

    2.创建一个抛出异常的异步方法。

import java.util.Map;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Component;

/*定义异常捕获触发*/
@Component
public class AsyncMailTrigger {

    @Async
    public void sendMailwithException() throws Exception{
        throw new Exception("SMTP Server not found :: orginated from Thread :: " +         Thread.currentThread().getName());

    }

}

3.创建一个调用Caller。

import java.util.HashMap;
import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Component;

@Component
public class AsyncCaller {

    @Autowired
    AsyncMailTrigger asyncMailTriggerObject;

    public void rightWayToCall() throws Exception {
    System.out.println("Calling From rightWayToCall Thread " +     Thread.currentThread().getName());
    asyncMailTriggerObject.senMailwithException();

    }

}

4.创建运行主类：

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.scheduling.annotation.EnableAsync;
import com.example.ask2shamik.springAsync.demo.AsyncCaller;

@SpringBootApplication
public class DemoApplication {

    @Autowired
    AsyncCaller caller;

    public static void main(String[] args) {
    SpringApplication.run(DemoApplication.class, args);

    }
     @Bean
     public CommandLineRunner commandLineRunner(ApplicationContext ctx) {
            return args -> {
                caller.rightWayToCall();
             };
        }
}

//输出结果：
//Calling From rightWayToCall Thread main
//Exception Caught in Thread - SimpleAsyncTaskExecutor-1
//Exception message - SMTP Server not found:: originated from Thread:: //SimpleAsyncTaskExecutor-1
//Method name - senMailwithException

Spring-@Async 使用参考：https://blog.csdn.net/u011663149/article/details/88561868

---