1)增加pom配置
<dependency> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-starter-web</artifactid> <exclusions> <exclusion> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-starter-tomcat</artifactid> </exclusion> </exclusions> </dependency> <dependency> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-starter-undertow</artifactid> </dependency>
2)增加相关配置
server: undertow: direct-buffers: true io-threads: 4 worker-threads: 160

1)pom依赖 一般springboot引入web相关依赖就行
<dependency> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-starter-web</artifactid> </dependency>
2)在启动类中增加@EnableAsync注解
@EnableAsync @SpringBootApplication public class AppApplication { public static void main(String[] args) { SpringApplication.run(AppApplication.class, args); } }
3)需要时在指定方法中增加@Async注解,如果是需要等待返回值,则demo如下
@Async public Future<string> doReturn(int i){ try { // 这个方法需要调用500毫秒 Thread.sleep(500); } catch (InterruptedException e) { e.printStackTrace(); } // 消息汇总 return new AsyncResult<>("异步调用"); }
4)如果有线程变量或者logback中的mdc,可以增加传递
import org.slf4j.MDC; import org.springframework.context.annotation.Configuration; import org.springframework.core.task.TaskDecorator; import org.springframework.scheduling.annotation.AsyncConfigurerSupport; import org.springframework.scheduling.annotation.EnableAsync; import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor; import java.util.Map; import java.util.concurrent.Executor; /** * @Description: */ @EnableAsync @Configuration public class AsyncConfig extends AsyncConfigurerSupport { @Override public Executor getAsyncExecutor() { ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor(); executor.setTaskDecorator(new MdcTaskDecorator()); executor.initialize(); return executor; } } class MdcTaskDecorator implements TaskDecorator { @Override public Runnable decorate(Runnable runnable) { Map<string, string> contextMap = MDC.getCopyOfContextMap(); return () -> { try { MDC.setContextMap(contextMap); runnable.run(); } finally { MDC.clear(); } }; } }
5)有时候异步需要增加阻塞
import lombok.extern.slf4j.Slf4j; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor; import java.util.concurrent.Executor; import java.util.concurrent.ThreadPoolExecutor; @Configuration @Slf4j public class TaskExecutorConfig { @Bean("localDbThreadPoolTaskExecutor") public Executor threadPoolTaskExecutor() { ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor(); taskExecutor.setCorePoolSize(5); taskExecutor.setMaxPoolSize(200); taskExecutor.setQueueCapacity(200); taskExecutor.setKeepAliveSeconds(100); taskExecutor.setThreadNamePrefix("LocalDbTaskThreadPool"); taskExecutor.setRejectedExecutionHandler((Runnable r, ThreadPoolExecutor executor) -> { if (!executor.isShutdown()) { try { Thread.sleep(300); executor.getQueue().put(r); } catch (InterruptedException e) { log.error(e.toString(), e); Thread.currentThread().interrupt(); } } } ); taskExecutor.initialize(); return taskExecutor; } }