java5以后，线程有了很大的变化，在使用上更加方便功能更佳强大，Springboot里面进行了进一步的封装。

    我们来看一个例子

   package com.executor;

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

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import org.springframework.aop.interceptor.AsyncUncaughtExceptionHandler;

import org.springframework.context.annotation.Configuration;
import
org.springframework.scheduling.annotation.AsyncConfigurer;
import org.springframework.scheduling.annotation.EnableAsync;

import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

@Configuration@EnableAsync
br/>@EnableAsync

@Override
public Executor getAsyncExecutor() {
    ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
    executor.setCorePoolSize(5);
    executor.setMaxPoolSize(15);
    executor.setThreadNamePrefix("Anno-Executor");
    executor.setQueueCapacity(25);
    executor.initialize();
    System.out.println("initialize complete ..");
    // 设置拒绝策略
    executor.setRejectedExecutionHandler(new RejectedExecutionHandler() {
        @Override
        public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
            // .....
            System.out.println("do somethings by myself ...");
        }
    });
    // 使用预定义的异常处理类
    // executor.setRejectedExecutionHandler(new
    // ThreadPoolExecutor.CallerRunsPolicy());

    return executor;
}

@Override
public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
    return null;
}

}

package com.executor;

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

import org.springframework.aop.interceptor.AsyncUncaughtExceptionHandler;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.Async;
import org.springframework.scheduling.annotation.AsyncConfigurer;
import org.springframework.scheduling.annotation.AsyncResult;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.stereotype.Service;

@Service
public class SyncService {@Async
br/>@Async
System.out.println("进入service。。。");
try {
Thread.sleep(3000);
System.out.println("3S后数据开始处理中。。");
} catch (InterruptedException e) {
e.printStackTrace();
}
}

@Async
public Future asyncInvokeReturnFuture(int i) {
    System.out.println("进入asyncInvokeReturnFuture..." + Thread.currentThread().getName());
    Future future;
    try {
        Thread.sleep(3000);
        System.out.println("3S后asyncInvokeReturnFuture数据开始处理中。。");
        future = new AsyncResult("success:" + i);
    } catch (InterruptedException e) {
        future = new AsyncResult("error");
    }
    return future;
}

}

运行一下看看

package com.executor;
import java.util.Date;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.scheduling.annotation.Async;
import org.springframework.scheduling.annotation.AsyncResult;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;@EnableAutoConfiguration
br/>@EnableAutoConfiguration
br/>@SpringBootApplication
br/>@EnableAsync

private final static Logger logger = LoggerFactory.getLogger(ExampleSync.class);
@Autowired
SyncService asyncService;

public static void main(String[] args) throws Exception {
    SpringApplication.run(ExampleSync.class, args);
}

 @GetMapping("/hello")
    public String hello(){
        System.out.println("进入Controller。。。");
        asyncService.hello();
        Future future=asyncService.asyncInvokeReturnFuture(300);
        String s = null;
        try {
            s = future.get();
        } catch (Exception e){
            e.printStackTrace();
        }
        System.out.println("异步方法返回值 ： "+s);
        return s;
    }

}

进入Controller。。。
进入service。。。
进入asyncInvokeReturnFuture...Anno-Executor2
3S后数据开始处理中。。
3S后asyncInvokeReturnFuture数据开始处理中。。
异步方法返回值 ： success:300
进入Controller。。。
进入service。。。
进入asyncInvokeReturnFuture...Anno-Executor3
3S后数据开始处理中。。
3S后asyncInvokeReturnFuture数据开始处理中。。
异步方法返回值 ： success:300

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