java后台很多场景是需要异步去处理的,比如耗时比较的大的,以及当前任务关系不是很依赖的推送、发送短信、赠送卡券优惠券、打包zip等等。这个时候异步执行器会很方便。
1、定义多线程池
启用异步注解:@EnableAsync
ExecutorConfig.java
import lombok.extern.slf4j.Slf4j;
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;
@Configuration
@EnableAsync
@Slf4j
public class ExecutorConfig {
String executors = "10";//可以从配置文件中获取
@Bean
public Executor asyncServiceExecutor() {
log.debug("开始配置 --> asyncServiceExecutor 异步线程执行器");
ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
//配置核心线程数
executor.setCorePoolSize(Integer.parseInt(executors));
//配置最大线程数
executor.setMaxPoolSize(Integer.parseInt(executors));
//配置队列大小
executor.setQueueCapacity(0);
//配置线程池中的线程的名称前缀
executor.setThreadNamePrefix("async-service-");
// 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());
//执行初始化
executor.initialize();