Springboot 启动之后初始化资源的几种方法

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.erbadagang.setup.init</groupId>
    <artifactId>setup-init</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>setup-init</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <spring-boot.version>2.3.0.RELEASE</spring-boot.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.8</version>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

spring.application.name=setup-init
management.endpoints.jmx.exposure.include=*
management.endpoints.web.exposure.include=*
management.endpoint.health.show-details=always
# spring cloud access&secret config
# 可以访问如下地址查看: https://usercenter.console.aliyun.com/#/manage/ak
alibaba.cloud.access-key=****
alibaba.cloud.secret-key=****
# 应用服务 WEB 访问端口
server.port=8080
# Actuator Web 访问端口
management.server.port=8081

package com.erbadagang.setup.init.setupinit;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SetupInitApplication {

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

}

package com.erbadagang.setup.init.setupinit.service;

import org.springframework.stereotype.Service;

/**
 * MyService作用是：模拟一个service被springboot初始化代码调用。
 *
 * @ClassName: MyService
 * @author: 郭秀志 jbcode@126.com
 * @date: 2020/6/26 16:42
 * @Copyright:
 */
@Service
public class MyService {
    public String getName() {
        return "guoxiuzhi";
    }
}

package com.erbadagang.setup.init.setupinit.init;

import com.erbadagang.setup.init.setupinit.service.MyService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.event.ApplicationReadyEvent;
import org.springframework.context.annotation.Bean;
import org.springframework.context.event.EventListener;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;

/**
 * StartUpInit作用是：演示如下几种初始化方法
 *
 * @ClassName: StartUpInit
 * @author: 郭秀志 jbcode@126.com
 * @date: 2020/6/26 17:14
 * @Copyright:
 */
@Slf4j
@Component
public class SetupInit {

    @Autowired
    private MyService service;

    @PostConstruct
    public void init() {
        log.info(">>>>>分割线>>>>>");
        log.info(" @PostConstruct 初始化开始");
        log.info(service.getName() + " from PostConstruct");
    }

    /**
     * ApplicationReadyEvent 事件监听当ApplicationReady后执行。
     *
     * @param event
     */
    @EventListener
    public void handleApplicationReady(ApplicationReadyEvent event) {
        log.info(">>>>>分割线>>>>>");
        log.info("The application is ready, 初始化开始");
        log.info(service.getName() + " from ApplicationReadyEvent");
    }

    @Bean(initMethod = "init")
    public InitMethodBean initMethodBean() {
        return new InitMethodBean();
    }

    class InitMethodBean {
        @Autowired
        private MyService service;

        void init() {
            log.info(">>>>>分割线>>>>>");
            log.info(service.getName() + " from InitMethodBean");
        }

        public String getServiceName() {
            return service.getName() + " from the method 'getServiceName' of autowired Bean";
        }
    }
}

package com.erbadagang.setup.init.setupinit.init;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.core.Ordered;
import org.springframework.stereotype.Component;
import org.springframework.util.CollectionUtils;

import java.util.List;

/**
 * @description 应用启动时读取传入参数
 * @ClassName: DefaultApplicationRunner
 * @author: 郭秀志 jbcode@126.com
 * @date: 2020/6/26 19:27
 * @Copyright:
 */
@Slf4j
@Component
public class DefaultApplicationRunner implements ApplicationRunner, Ordered {

    @Autowired
    private SetupInit.InitMethodBean initMethodBean;

    @Override
    public void run(ApplicationArguments args) throws Exception {

        log.info("i am applicationRunner! invoke the bean method:" + initMethodBean.getServiceName());

        args.getOptionNames().forEach(System.out::println);
        System.out.println(">>>>>>>>>>>>>>>>>>>>>>>>>>");
        String[] sourceArgs = args.getSourceArgs();

        if (sourceArgs != null) {
            for (String sourceArg : sourceArgs) {
                System.out.println("sourceArg = " + sourceArg);
            }
        }


        log.info("<<<<<<<<<<<KV对参数<<<<<<<<<<<<<<");
        List<String> foo = args.getOptionValues("dev.name");
        if (!CollectionUtils.isEmpty(foo)) {
            foo.forEach(System.out::println);
        }

        log.info("++++++单身狗参数++++++");
        List<String> nonOptionArgs = args.getNonOptionArgs();
        log.info("nonOptionArgs.size() = " + nonOptionArgs.size());
        nonOptionArgs.forEach(System.out::println);
    }

    @Override
    public int getOrder() {
        return Ordered.HIGHEST_PRECEDENCE + 65;
    }
}