发布的jar包，启动时读取version文件，打印版本信息

import lombok.extern.slf4j.Slf4j;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.nio.charset.StandardCharsets;

/**
 * 打印发布包中【version文件】里面的版本信息
 *
 * @author jiuyan
 * @since 2023/11/28
 */
@Slf4j
public class VersionTools {
    /**
     * 使用springboot封装的classpath查找工具。
     * * @param path
     */
    public static void versionInfoPrint_spring(String path) {
        if (path == null || path.isEmpty()) {
            path = "version";
        }
        try {
            ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();
            Resource[] resources = resourcePatternResolver.getResources("classpath*:" + path);
            for (Resource resource : resources) {
                System.out.println("----------------------------------");
                //获取文件名
                //System.out.println(resource.getFilename());
                System.out.println("START---version file: "+resource.getURL());

                BufferedReader bfreader = new BufferedReader(new InputStreamReader(resource.getInputStream(), StandardCharsets.UTF_8));
                //打印前30行
                //bfreader.lines().limit(20).forEach(System.out::println);
                bfreader.lines().limit(20).forEach(log::info);
                bfreader.close();
            }
            System.out.println("START---versionInfo: 版本号信息获取结束");
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("START---versionInfo: 版本号信息获取异常");
        }
    }

    /**
     * 使用java的classloader查找包内文件
     * @param path
     */
    public static void versionInfoPrint(String path) {
        if (path == null || path.isEmpty()) {
            path = "version";
        }
        try {
            ClassLoader classLoader = VersionTools.class.getClassLoader();
            System.out.println(classLoader.toString());

            URL resource = classLoader.getResource(path);
            if (resource == null) {
                System.out.println("START---versionInfo: 版本号文件获取为空");
                return;
            }
            System.out.println("START---version file: "+resource);
            InputStream inputStream = resource.openStream();


            BufferedReader bfreader = new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.UTF_8));
            //打印前30行
            //bfreader.lines().limit(20).forEach(System.out::println);
            bfreader.lines().limit(20).forEach(log::info);
            bfreader.close();

            System.out.println("START---versionInfo: 版本号信息获取结束");
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("START---versionInfo: 版本号信息获取异常");
        }

    }

}

参考文章：

【SpringBoot】三种方式，教你读取 jar 包中的 resources 目录下的文件_jar包获取resource下的文件路径-优快云博客

Springboot读取Jar包内文件_springboot读取jar包中的文件-优快云博客