content: package org.springblade.mng.config.util;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.text.DecimalFormat;
  
  public class FileSizeUtil {
  	private static final String TAG=FileSizeUtil.class.getSimpleName();
  
  	public static final int SIZETYPE_B = 1;//获取文件大小单位为B的double值
  	public static final int SIZETYPE_KB = 2;//获取文件大小单位为KB的double值
  	public static final int SIZETYPE_MB = 3;//获取文件大小单位为MB的double值
  	public static final int SIZETYPE_GB = 4;//获取文件大小单位为GB的double值
  
  	/**
  	 * 获取文件指定文件的指定单位的大小
  	 *
  	 * @param filePath 文件路径
  	 * @param sizeType 获取大小的类型1为B、2为KB、3为MB、4为GB
  	 * @return double值的大小
  	 */
  	public static double getFileOrFilesSize(String filePath, int sizeType) {
  		File file = new File(filePath);
  		long blockSize = 0;
  		try {
  			if (file.isDirectory()) {
  				blockSize = getFileSizes(file);
  			} else {
  				blockSize = getFileSize(file);
  			}
  		} catch (Exception e) {
  			e.printStackTrace();
  		}
  		return FormetFileSize(blockSize, sizeType);
  	}
  
  	/**
  	 * 调用此方法自动计算指定文件或指定文件夹的大小
  	 *
  	 * @param filePath 文件路径
  	 * @return 计算好的带B、KB、MB、GB的字符串
  	 */
  	public static String getAutoFileOrFilesSize(String filePath) {
  		File file = new File(filePath);
  		long blockSize = 0;
  		try {
  			if (file.isDirectory()) {
  				blockSize = getFileSizes(file);
  			} else {
  				blockSize = getFileSize(file);
  			}
  		} catch (Exception e) {
  			e.printStackTrace();
  		}
  		return formatFileSize(blockSize);
  	}
  
  	/**
  	 * 获取指定文件大小
  	 */
  	private static long getFileSize(File file) throws Exception {
  		long size = 0;
  		if (file.exists()) {
  			FileInputStream fis = null;
  			fis = new FileInputStream(file);
  			size = fis.available();
  		} else {
  			file.createNewFile();
  		}
  		return size;
  	}
  
  	/**
  	 * 获取指定文件夹
  	 */
  	private static long getFileSizes(File f) throws Exception {
  		long size = 0;
  		File flist[] = f.listFiles();
  		assert flist != null;
  		for (File file : flist) {
  			if (file.isDirectory()) {
  				size = size + getFileSizes(file);
  			} else {
  				size = size + getFileSize(file);
  			}
  		}
  		return size;
  	}
  
  	/**
  	 * 转换文件大小
  	 */
  	public static String formatFileSize(long fileS) {
  		DecimalFormat df = new DecimalFormat("#.00");
  		String fileSizeString = "";
  		String wrongSize = "0B";
  		if (fileS == 0) {
  			return wrongSize;
  		}
  		if (fileS < 1024) {
  			fileSizeString = df.format((double) fileS) + "B";
  		} else if (fileS < 1048576) {
  			fileSizeString = df.format((double) fileS / 1024) + "KB";
  		} else if (fileS < 1073741824) {
  			fileSizeString = df.format((double) fileS / 1048576) + "MB";
  		} else {
  			fileSizeString = df.format((double) fileS / 1073741824) + "GB";
  		}
  		return fileSizeString;
  	}
  
  	/**
  	 * 转换文件大小,指定转换的类型
  	 */
  	private static double FormetFileSize(long fileS, int sizeType) {
  		DecimalFormat df = new DecimalFormat("#.00");
  		double fileSizeLong = 0;
  		switch (sizeType) {
  			case SIZETYPE_B:
  				fileSizeLong = Double.valueOf(df.format((double) fileS));
  				break;
  			case SIZETYPE_KB:
  				fileSizeLong = Double.valueOf(df.format((double) fileS / 1024));
  				break;
  			case SIZETYPE_MB:
  				fileSizeLong = Double.valueOf(df.format((double) fileS / 1048576));
  				break;
  			case SIZETYPE_GB:
  				fileSizeLong = Double.valueOf(df.format((double) fileS / 1073741824));
  				break;
  			default:
  				break;
  		}
  		return fileSizeLong;
  	}
  }
  