package com.wgcloud.util;
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import org.apache.commons.lang3.StringUtils;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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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.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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/**
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* @version v3.3
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* @ClassName:MD5Utils.java
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* @author: http://www.wgstart.com
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* @date: 2021年1月16日
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* @Description: Md5加密处理
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* @Copyright: 2019-2021 wgcloud. All rights reserved.
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*/
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@SuppressWarnings("unused")
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public class MD5Utils {
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private static final Logger logger = LoggerFactory.getLogger(MD5Utils.class);
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// 全局数组
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private final static String[] strDigits = {"0", "1", "2", "3", "4", "5",
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"6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};
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/**
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* 16进制字符
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*/
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private final static char hexdigits[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8',
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'9', 'a', 'b', 'c', 'd', 'e', 'f'};
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/**
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* 对文件全文生成MD5摘要
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*
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* @param file 要加密的文件
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* @return MD5摘要码
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*/
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public static String getMD5ForFile(String filePath) {
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FileInputStream fis = null;
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MessageDigest md = null;
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try {
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md = MessageDigest.getInstance("MD5");
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File file = new File(filePath);
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if (!file.exists()) {
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return "";
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}
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fis = new FileInputStream(file);
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byte[] buffer = new byte[4096];
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int length = -1;
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while ((length = fis.read(buffer)) != -1) {
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md.update(buffer, 0, length);
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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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logger.error("获取MD5信息发生异常！" + ex.toString());
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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 e) {
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logger.error("获取MD5信息发生异常！" + e.toString());
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}
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}
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}
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/**
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* 把byte[]数组转换成十六进制字符串表示形式
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*
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* @param tmp 要转换的byte[]
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* @return 十六进制字符串表示形式
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*/
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private static String byteToHexString(byte[] tmp) {
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String s;
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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 < 16; i++) {
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byte byte0 = tmp[i];
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str[k++] = hexdigits[byte0 >>> 4 & 0xf];
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str[k++] = hexdigits[byte0 & 0xf];
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}
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s = new String(str);
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return s;
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}
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// 返回形式为数字跟字符串
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private static String byteToArrayString(byte bByte) {
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int iRet = bByte;
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// System.out.println("iRet="+iRet);
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if (iRet < 0) {
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iRet += 256;
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}
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int iD1 = iRet / 16;
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int iD2 = iRet % 16;
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return strDigits[iD1] + strDigits[iD2];
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}
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// 返回形式只为数字
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private static String byteToNum(byte bByte) {
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int iRet = bByte;
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System.out.println("iRet1=" + iRet);
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if (iRet < 0) {
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iRet += 256;
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}
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return String.valueOf(iRet);
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}
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// 转换字节数组为16进制字串
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private static String byteToString(byte[] bByte) {
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StringBuffer sBuffer = new StringBuffer();
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for (int i = 0; i < bByte.length; i++) {
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sBuffer.append(byteToArrayString(bByte[i]));
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}
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return sBuffer.toString();
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}
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/**
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* 返回md5小写字符串
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* @param strObj
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* @return
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*/
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public static String GetMD5Code(String strObj) {
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if (StringUtils.isEmpty(strObj)) {
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return "";
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}
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String resultString = null;
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try {
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resultString = new String(strObj);
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MessageDigest md = MessageDigest.getInstance("MD5");
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// md.digest() 该函数返回值为存放哈希值结果的byte数组
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resultString = byteToString(md.digest(strObj.getBytes()));
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} catch (NoSuchAlgorithmException ex) {
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ex.printStackTrace();
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}
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return resultString;
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}
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}
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