Java ermittelt, ob eine Datei in einem Ordner vorhanden ist

 /**
  * 读取某个文件夹下的所有文件
  */
 public static boolean hasfile(String filepath) throws FileNotFoundException, IOException {
     try {
         File file = new File(filepath);
         if (!file.isDirectory()) {
             System.out.println("请输入一个目录");
             return false;
         } else if (file.isDirectory()) {
             String[] filelist = file.list();
             if (filelist.length) {
                 System.out.println("该目录下存在文件");
             }
         }
     } catch (FileNotFoundException e) {
         System.out.println("readfile()   Exception:" + e.getMessage());
     }
     return true;
 }

System.out.println( hasfile("c:/users/admin/desktop") ? "存在文件" : "不存在文件" );