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