网站建设的静态网页作业,怎么建自己的网站?,做电商需要学哪些基础,抖音seo软件工具SpringBoot系列之启动成功后执行业务逻辑。在Springboot项目中经常会遇到需要在项目启动成功后#xff0c;加一些业务逻辑的#xff0c;比如缓存的预处理#xff0c;配置参数的加载等等场景#xff0c;下面给出一些常有的方法
实验环境
JDK 1.8SpringBoot 2.2.1Maven 3.2…SpringBoot系列之启动成功后执行业务逻辑。在Springboot项目中经常会遇到需要在项目启动成功后加一些业务逻辑的比如缓存的预处理配置参数的加载等等场景下面给出一些常有的方法
实验环境
JDK 1.8SpringBoot 2.2.1Maven 3.2Mysql 8.0.26开发工具 IntelliJ IDEA smartGit
动手实践
ApplicationRunner和CommandLineRunner
比较常有的使用Springboot框架提供的ApplicationRunner和CommandLineRunner这两种Runner可以实现在Springboot项目启动后执行我们自定义的业务逻辑然后执行的顺序可以通过Order进行排序参数值越小越早执行
写个测试类实现ApplicationRunner接口注意加上Component才能被Spring容器扫描到
package com.example.jedis.runner;import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;Order(1)
Component
Slf4j
public class TestApplicationRunner implements ApplicationRunner {Overridepublic void run(ApplicationArguments args) throws Exception {log.info(TestApplicationRunner);}
} 实现CommandLineRunner接口
package com.example.jedis.runner;import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.CommandLineRunner;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;Order(2)
Component
Slf4j
public class TestCommandLineRunner implements CommandLineRunner {Overridepublic void run(String... args) throws Exception {log.info(TestCommandLineRunner);}
} ApplicationListener加ApplicationStartedEvent
SpringBoot基于Spring框架的事件监听机制提供ApplicationStartedEvent可以对SpringBoot启动成功后的监听基于事件监听机制我们可以在SpringBoot启动成功后做一些业务操作
package com.example.jedis.listener;import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.context.event.ApplicationStartedEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.stereotype.Component;Component
Slf4j
public class TestApplicationListener implements ApplicationListenerApplicationStartedEvent {Overridepublic void onApplicationEvent(ApplicationStartedEvent applicationStartedEvent) {log.info(onApplicationEvent);}
} SpringApplicationRunListener
如果要在启动的其它阶段做业务操作可以实现SpringApplicationRunListener接口例如要实现打印swagger的api接口文档url可以在对应方法进行拓展即可
package com.example.jedis.listener;import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.SpringApplicationRunListener;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.core.env.ConfigurableEnvironment;import java.net.InetAddress;Slf4j
public class TestSpringApplicationRunListener implements SpringApplicationRunListener {private final SpringApplication application;private final String[] args;public TestSpringApplicationRunListener(SpringApplication application, String[] args) {this.application application;this.args args;}Overridepublic void starting() {log.info(starting...);}Overridepublic void environmentPrepared(ConfigurableEnvironment environment) {log.info(environmentPrepared...);}Overridepublic void contextPrepared(ConfigurableApplicationContext context) {log.info(contextPrepared...);}Overridepublic void contextLoaded(ConfigurableApplicationContext context) {log.info(contextLoaded...);}Overridepublic void started(ConfigurableApplicationContext context) {log.info(started...);}SneakyThrowsOverridepublic void running(ConfigurableApplicationContext context) {log.info(running...);ConfigurableEnvironment environment context.getEnvironment();String port environment.getProperty(server.port);String contextPath environment.getProperty(server.servlet.context-path);String docPath port contextPath /doc.html;String externalAPI InetAddress.getLocalHost().getHostAddress();log.info(\n Swagger API: Local-API: \t\thttp://127.0.0.1:{}\n\t External-API: \thttp://{}:{}\n\t,docPath, externalAPI, docPath);}Overridepublic void failed(ConfigurableApplicationContext context, Throwable exception) {log.info(failed...);}
}
在/META-INF/spring.factories配置文件配置
org.springframework.boot.SpringApplicationRunListener\com.example.jedis.listener.TestSpringApplicationRunListener源码分析
在Springboot的run方法里找到如下的源码大概看一下就可以知道里面是封装了对Runner和SpringApplicationRunListener的调用
public ConfigurableApplicationContext run(String... args) {StopWatch stopWatch new StopWatch();stopWatch.start();ConfigurableApplicationContext context null;CollectionSpringBootExceptionReporter exceptionReporters new ArrayList();this.configureHeadlessProperty();SpringApplicationRunListeners listeners this.getRunListeners(args);// SpringApplicationRunListener调用listeners.starting();Collection exceptionReporters;try {ApplicationArguments applicationArguments new DefaultApplicationArguments(args);ConfigurableEnvironment environment this.prepareEnvironment(listeners, applicationArguments);this.configureIgnoreBeanInfo(environment);Banner printedBanner this.printBanner(environment);context this.createApplicationContext();exceptionReporters this.getSpringFactoriesInstances(SpringBootExceptionReporter.class, new Class[]{ConfigurableApplicationContext.class}, context);this.prepareContext(context, environment, listeners, applicationArguments, printedBanner);this.refreshContext(context);this.afterRefresh(context, applicationArguments);stopWatch.stop();if (this.logStartupInfo) {(new StartupInfoLogger(this.mainApplicationClass)).logStarted(this.getApplicationLog(), stopWatch);}// SpringApplicationRunListener startlisteners.started(context);// 调用所有的Runnerthis.callRunners(context, applicationArguments);} catch (Throwable var10) {this.handleRunFailure(context, var10, exceptionReporters, listeners);throw new IllegalStateException(var10);}try {// SpringApplicationRunListener running执行listeners.running(context);return context;} catch (Throwable var9) {this.handleRunFailure(context, var9, exceptionReporters, (SpringApplicationRunListeners)null);throw new IllegalStateException(var9);}}
