删除文件夹(前提:文件夹为空以及InputStream和OutputStream等一些数据文件流关掉【close()】,否则文件无法删除)

//删除文件夹  
public static void delFolder(String folderPath) {  
     try {  
        delAllFile(folderPath); //删除完里面所有内容  
        String filePath = folderPath;  
        filePath = filePath.toString();  
        java.io.File myFilePath = new java.io.File(filePath);  
        myFilePath.delete(); //删除空文件夹  
     } catch (Exception e) {  
       e.printStackTrace();   
     }  
}
//删除指定文件夹下的所有文件

public static boolean delAllFile(String path) {  
       boolean flag = false;  
       File file = new File(path);  
       if (!file.exists()) {  
         return flag;  
       }  
       if (!file.isDirectory()) {  
         return flag;  
       }  
       String[] tempList = file.list();  
       File temp = null;  
       for (int i = 0; i < tempList.length; i++) {  
          if (path.endsWith(File.separator)) {  
             temp = new File(path + tempList[i]);  
          } else {  
              temp = new File(path + File.separator + tempList[i]);  
          }  
          if (temp.isFile()) {  
             temp.delete();  
          }  
          if (temp.isDirectory()) {  
             delAllFile(path + "/" + tempList[i]);//先删除文件夹里面的文件  
             delFolder(path + "/" + tempList[i]);//再删除空文件夹  
             flag = true;  
          }  
       }  
       return flag;  
  }