增加 spring 定时任务用例
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罗祥
61
spring/spring-scheduling-annotation/pom.xml
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61
spring/spring-scheduling-annotation/pom.xml
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.heibaiying</groupId>
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<artifactId>spring-scheduling-annotation</artifactId>
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<version>1.0-SNAPSHOT</version>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<configuration>
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<source>8</source>
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<target>8</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<properties>
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<spring-base-version>5.1.3.RELEASE</spring-base-version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-context</artifactId>
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<version>${spring-base-version}</version>
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</dependency>
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-beans</artifactId>
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<version>${spring-base-version}</version>
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</dependency>
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-core</artifactId>
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<version>${spring-base-version}</version>
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</dependency>
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-web</artifactId>
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<version>${spring-base-version}</version>
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</dependency>
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-webmvc</artifactId>
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<version>${spring-base-version}</version>
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</dependency>
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<dependency>
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<groupId>javax.servlet</groupId>
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<artifactId>javax.servlet-api</artifactId>
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<version>4.0.1</version>
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<scope>provided</scope>
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</dependency>
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</dependencies>
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</project>
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package com.heibaiying.config;
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import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
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/**
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* @author : heibaiying
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*/
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public class DispatcherServletInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
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protected Class<?>[] getRootConfigClasses() {
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return new Class[0];
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}
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protected Class<?>[] getServletConfigClasses() {
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return new Class[]{ServletConfig.class};
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}
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protected String[] getServletMappings() {
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return new String[]{"/"};
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}
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}
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package com.heibaiying.config;
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import org.springframework.aop.interceptor.AsyncUncaughtExceptionHandler;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.ComponentScan;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.scheduling.annotation.AsyncConfigurer;
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import org.springframework.scheduling.annotation.EnableAsync;
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import org.springframework.scheduling.annotation.EnableScheduling;
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import org.springframework.scheduling.annotation.SchedulingConfigurer;
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import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
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import org.springframework.scheduling.config.ScheduledTaskRegistrar;
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import org.springframework.web.servlet.config.annotation.EnableWebMvc;
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import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
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import javax.annotation.PreDestroy;
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import java.lang.reflect.Method;
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import java.util.concurrent.Executor;
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import java.util.concurrent.Executors;
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/**
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* @author : heibaiying
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* spring 主配置类
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*/
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@Configuration
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@EnableWebMvc
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@EnableScheduling //启用Spring的计划任务执行功能
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@EnableAsync //启用Spring的异步方法执行功能
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@ComponentScan(basePackages = {"com.heibaiying.task"})
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public class ServletConfig implements WebMvcConfigurer, AsyncConfigurer, SchedulingConfigurer {
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private ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
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// 任务执行器线程池配置
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@Override
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public Executor getAsyncExecutor() {
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executor.setCorePoolSize(5);
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executor.setMaxPoolSize(10);
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executor.setQueueCapacity(100);
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executor.setThreadNamePrefix("MyExecutor-");
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executor.initialize();
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return executor;
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}
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// 这个方法可以监听到异步程序发生的错误
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@Override
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public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
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return new AsyncUncaughtExceptionHandler() {
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@Override
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public void handleUncaughtException(Throwable ex, Method method, Object... params) {
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System.out.println(method.getName() + "发生错误:" + ex.getMessage());
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}
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};
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}
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// 如果程序结束，需要关闭线程池 不然程序无法完全退出 只能kill才能完全退出
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@PreDestroy
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public void destroy() {
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if (executor != null) {
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executor.shutdown();
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}
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}
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// 调度程序线程池配置
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@Override
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public void configureTasks(ScheduledTaskRegistrar taskRegistrar) {
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taskRegistrar.setScheduler(taskExecutor());
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}
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// 如果程序结束，需要关闭线程池
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@Bean(destroyMethod = "shutdown")
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public Executor taskExecutor() {
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return Executors.newScheduledThreadPool(50);
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}
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/*关于调度程序线程池作用说明
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*
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* 按照例子 我们有methodA 、 methodB 、methodC 三个方法 其中 methodB 是耗时的方法,且不支持异步
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* 如果不声明调度程序线程池 则methodB 会阻塞 methodA 、methodC 方法的执行 因为调度程序是单线程的
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*/
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/*关于任务执行线程池作用说明
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*
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* 按照例子 如果我们声明 methodB 是按照 fixedRate=5000 方法执行的 ，理论上不管任务耗时多久，任务都应该是
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* 每5秒执行一次，但是实际上任务是被加入执行队列，也不会立即被执行，因为默认执行任务是单线程的，这个时候需要开启
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* @EnableAsync 并指定方法是 @Async 异步的，并且配置执行任务线程池(如果不配置就使用默认的线程池配置)
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*/
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/*配置建议 如果不需要细粒度的控制 以上代码配置都不是必须的 但是建议耗时方法采用异步执行*/
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}
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@ -0,0 +1,43 @@
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package com.heibaiying.task;
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import org.springframework.scheduling.annotation.Async;
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import org.springframework.scheduling.annotation.Scheduled;
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import org.springframework.stereotype.Component;
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import java.time.LocalDateTime;
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/**
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* @author : heibaiying
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*/
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@Component
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public class Task {
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/**
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* 基于间隔的触发器，其中间隔是从上一个任务的 完成时间 开始计算, 时间单位值以毫秒为单位。
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*/
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@Scheduled(fixedDelay = 5000, initialDelay = 1000)
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public void methodA() {
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Thread thread = Thread.currentThread();
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System.out.println(String.format("线程名称：%s ; 线程ID：%s ; 调用方法：%s ; 调用时间：%s",
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thread.getName(), thread.getId(), "methodA方法执行", LocalDateTime.now()));
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}
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/**
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* 基于间隔的触发器，其中间隔是从上一个任务的 开始时间 开始测量的。
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*/
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@Scheduled(fixedRate = 5000)
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@Async
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public void methodB() throws InterruptedException {
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Thread thread = Thread.currentThread();
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System.out.println(String.format("线程名称：%s ; 线程ID：%s ; 调用方法：%s ; 调用时间：%s",
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thread.getName(), thread.getId(), "methodB方法执行", LocalDateTime.now()));
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Thread.sleep(10 * 1000);
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}
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@Scheduled(cron = "0/10 * * * * ?")
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public void methodC() {
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Thread thread = Thread.currentThread();
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System.out.println(String.format("线程名称：%s ; 线程ID：%s ; 调用方法：%s ; 调用时间：%s",
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thread.getName(), thread.getId(), "methodC方法执行", LocalDateTime.now()));
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}
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}
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