public class Constants {public static String getUploadDir() {// 获取 JAR 包所在目录ApplicationHome home = new ApplicationHome(Constants.class);File jarDir = home.getDir();// 构建上传文件存储路径（JAR 同级目录下的 uploads 文件夹）File uploadDir = new File(jarDir, "uploads");if (!uploadDir.exists()) {uploadDir.mkdirs();}return uploadDir.getAbsolutePath();}public final static   String UploadDir = getUploadDir();}

public static String getUploadDir() 方法为获取路径 在java - jar 启动方式目录如下

打印即可看到绝对路径