Java---文件夹及文件操作

/**  
     * 获取文件夹大小  
     * @param file File实例  
     * @return long     
     */   
    public static long getFolderSize(java.io.File file){  
 
        long size = 0;  
        try {
            java.io.File[] fileList = file.listFiles();   
            for (int i = 0; i < fileList.length; i++)   
            {   
                if (fileList[i].isDirectory())   
                {   
                    size = size + getFolderSize(fileList[i]);  
 
                }else{   
                    size = size + fileList[i].length();  
 
                }   
            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }   
       //return size/1048576;  
        return size;  
    }  
    
    /**  
     * 删除指定目录下文件及目录   
     * @param deleteThisPath  
     * @param filepath  
     * @return   
     */   
    public void deleteFolderFile(String filePath, boolean deleteThisPath) {   
        if (!TextUtils.isEmpty(filePath)) {   
            try {
                File file = new File(filePath);   
                if (file.isDirectory()) {// 处理目录   
                    File files[] = file.listFiles();   
                    for (int i = 0; i < files.length; i++) {   
                        deleteFolderFile(files[i].getAbsolutePath(), true);   
                    }    
                }   
                if (deleteThisPath) {   
                    if (!file.isDirectory()) {// 如果是文件，删除   
                        file.delete();   
                    } else {// 目录   
                   if (file.listFiles().length == 0) {// 目录下没有文件或者目录，删除   
                            file.delete();   
                        }   
                    }   
                }
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }   
        }   
    }  
    /**
     * 格式化单位
     * @param size
     * @return
     */
    public static String getFormatSize(double size) {
        double kiloByte = size/1024;
        if(kiloByte < 1) {
            return size + "Byte(s)";
        }
        
        double megaByte = kiloByte/1024;
        if(megaByte < 1) {
            BigDecimal result1 = new BigDecimal(Double.toString(kiloByte));
            return result1.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "KB";
        }
        
        double gigaByte = megaByte/1024;
        if(gigaByte < 1) {
            BigDecimal result2  = new BigDecimal(Double.toString(megaByte));
            return result2.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "MB";
        }
        
        double teraBytes = gigaByte/1024;
        if(teraBytes < 1) {
            BigDecimal result3 = new BigDecimal(Double.toString(gigaByte));
            return result3.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "GB";
        }
        BigDecimal result4 = new BigDecimal(teraBytes);
        return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "TB";
    }