String classpath = this.getClass().getResource("/").getPath().replaceFirst("/", "");
String fileDir = classpath.replaceAll("WEB-INF/classes/", "upload");
upload为目标文件夹,fileDir 为路径
String fileDir = classpath.replaceAll("WEB-INF/classes/", "upload");
upload为目标文件夹,fileDir 为路径