对比新文件 |
| | |
| | | package com.yssh.utils; |
| | | |
| | | import java.io.File; |
| | | import java.io.FileInputStream; |
| | | import java.io.IOException; |
| | | import java.nio.ByteBuffer; |
| | | import java.nio.channels.FileChannel; |
| | | import java.security.MessageDigest; |
| | | |
| | | public class FileUtils { |
| | | public final static int SIXTEEN = 16; |
| | | |
| | | public static final char[] HEX_DIGITS = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'}; |
| | | |
| | | @SuppressWarnings("unused") |
| | | public static String getFileMd5(String filePath) { |
| | | FileInputStream fis = null; |
| | | try { |
| | | MessageDigest md = MessageDigest.getInstance("MD5"); |
| | | |
| | | fis = new FileInputStream(new File(filePath)); |
| | | FileChannel fChannel = fis.getChannel(); |
| | | ByteBuffer buffer = ByteBuffer.allocateDirect(1024 * 1024); |
| | | |
| | | while (fChannel.read(buffer) != -1) { |
| | | buffer.flip(); |
| | | md.update(buffer); |
| | | buffer.compact(); |
| | | } |
| | | byte[] b = md.digest(); |
| | | |
| | | return byteToHexString(b); |
| | | } catch (Exception ex) { |
| | | ex.printStackTrace(); |
| | | return null; |
| | | } finally { |
| | | try { |
| | | if (null != fis) { |
| | | fis.close(); |
| | | } |
| | | } catch (IOException ex) { |
| | | ex.printStackTrace(); |
| | | } |
| | | } |
| | | } |
| | | |
| | | public static String byteToHexString(byte[] tmp) { |
| | | char[] str = new char[16 * 2]; |
| | | |
| | | int k = 0; |
| | | for (int i = 0; i < SIXTEEN; i++) { |
| | | byte byte0 = tmp[i]; |
| | | str[k++] = HEX_DIGITS[byte0 >>> 4 & 0xf]; |
| | | str[k++] = HEX_DIGITS[byte0 & 0xf]; |
| | | } |
| | | |
| | | return new String(str); |
| | | } |
| | | } |