package com.lxzn.framework.utils;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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/**
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* Created by admin on 2018/3/5.
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*/
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public class MD5Util {
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/**
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* The M d5.
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*/
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static MessageDigest MD5 = null;
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/**
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* The Constant HEX_DIGITS.
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*/
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private static final char HEX_DIGITS[] = {'0', '1', '2', '3', '4', '5',
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'6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
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static {
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try {
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MD5 = MessageDigest.getInstance("MD5");
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} catch (NoSuchAlgorithmException ne) {
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ne.printStackTrace();
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}
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}
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/**
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* 获取文件md5值.
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*
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* @param file the file
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* @return md5串
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* @throws IOException
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*/
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public static String getFileMD5String(File file) throws IOException {
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FileInputStream fileInputStream = null;
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try {
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fileInputStream = new FileInputStream(file);
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byte[] buffer = new byte[8192];
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int length;
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while ((length = fileInputStream.read(buffer)) != -1) {
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MD5.update(buffer, 0, length);
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}
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return new String(encodeHex(MD5.digest()));
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} catch (FileNotFoundException e) {
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throw e;
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} catch (IOException e) {
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throw e;
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} finally {
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try {
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if (fileInputStream != null)
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fileInputStream.close();
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} catch (IOException e) {
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throw e;
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}
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}
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}
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/**
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* 获取文件md5值.
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*
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* @param data the byte[] data
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* @return md5串
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* @throws IOException
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*/
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public static String getFileMD5String(byte[] data) throws IOException {
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MD5.update(data);
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return new String(encodeHex(MD5.digest()));
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}
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/**
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* Encode hex.
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*
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* @param bytes the bytes
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* @return the string
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*/
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public static String encodeHex(byte bytes[]) {
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return bytesToHex(bytes, 0, bytes.length);
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}
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/**
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* Bytes to hex.
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*
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* @param bytes the bytes
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* @param start the start
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* @param end the end
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* @return the string
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*/
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public static String bytesToHex(byte bytes[], int start, int end) {
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StringBuilder sb = new StringBuilder();
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for (int i = start; i < start + end; i++) {
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sb.append(byteToHex(bytes[i]));
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}
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return sb.toString();
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}
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/**
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* Byte to hex.
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*
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* @param bt the bt
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* @return the string
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*/
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public static String byteToHex(byte bt) {
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return HEX_DIGITS[(bt & 0xf0) >> 4] + "" + HEX_DIGITS[bt & 0xf];
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}
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/**
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* 获取md5值.
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*
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* @param str the string
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* @return md5串
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* @throws IOException
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*/
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public static String getStringMD5(String str) {
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StringBuilder sb = new StringBuilder();
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try {
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byte[] data = str.getBytes("utf-8");
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MessageDigest MD5 = MessageDigest.getInstance("MD5");
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MD5.update(data);
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data = MD5.digest();
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for (int i = 0; i < data.length; i++) {
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sb.append(HEX_DIGITS[(data[i] & 0xf0) >> 4] + "" + HEX_DIGITS[data[i] & 0xf]);
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}
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} catch (Exception e) {
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}
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return sb.toString();
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}
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/**
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* The main method.
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*
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* @param args the arguments
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*/
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public static void main(String[] args) {
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long beginTime = System.currentTimeMillis();
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File fileZIP = new File("D:\\BaiduNetdiskDownload\\test1.avi");
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String md5 = "";
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try {
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md5 = getFileMD5String(fileZIP);
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} catch (IOException e) {
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e.printStackTrace();
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}
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long endTime = System.currentTimeMillis();
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System.out.println("MD5:" + md5 + "\n time:" + ((endTime - beginTime)) + "ms");
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System.out.println(getStringMD5("111111"));
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}
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}
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