功能

在spring-boot项目启动时，将会打印项目的基本信息：服务名称，pom中的项目版本，以及jar包构建的时间,方便检测服务是否更新到正确的版本，也可以提供接口访问

实现步骤(steps 2)

step 1 添加服务启动的前置执行代码

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.env.Environment;

import javax.annotation.PostConstruct;

/**
 * 初始化bean之前执行即服务启动的前置代码
 */
@Configuration
@Slf4j
public class BeanPostConfig implements BeanPostProcessor {
    @Value("${project.version}")
    private String serviceVersion;
    @Value("${project.builddate}")
    private String serviceBuildDate;
    @Value("${spring.application.name}")
    private String serviceName;

    @Autowired
    private Environment environment;

    @PostConstruct
    public void  projectInfo(){
        StringBuffer projectInfo = new StringBuffer();
        projectInfo.append("\n=================project=================\n");
        projectInfo.append(String.format("\nservice name:%s\n",serviceName));
        projectInfo.append(String.format("\nservice version:%s\n",serviceVersion));
        projectInfo.append(String.format("\nservice build date:%s\n",serviceBuildDate));
        projectInfo.append("\n=================project=================\n");
        log.info(projectInfo.toString());

    }

}

step 2 application.yml配置变量

project:
  version: @project.version@
  builddate: @maven.build.timestamp@

注意获取maven的变量是使用@@，并且在@Value中使用@@是无效的,bootstrap.yml也无效,具体原理以后在了解一下