package com.hdl.photovoltaic.utils;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.UnsupportedEncodingException;
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import java.math.BigInteger;
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import java.nio.charset.StandardCharsets;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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public class HDLMD5Utils {
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/**
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* MD5转字符串
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*/
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public static String encodeMD5(String s) {
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try {
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MessageDigest digest = MessageDigest.getInstance("MD5");
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digest.update(s.getBytes(StandardCharsets.UTF_8));
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byte[] messageDigest = digest.digest();
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return toHexString(messageDigest);
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} catch (NoSuchAlgorithmException e) {
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e.printStackTrace();
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}
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return "";
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}
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private static String toHexString(byte[] keyData) {
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if (keyData == null) {
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return null;
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}
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int expectedStringLen = keyData.length * 2;
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StringBuilder sb = new StringBuilder(expectedStringLen);
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for (byte keyDatum : keyData) {
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String hexStr = Integer.toString(keyDatum & 0x00FF, 16);
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if (hexStr.length() == 1) {
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hexStr = "0" + hexStr;
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}
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sb.append(hexStr);
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}
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return sb.toString();
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}
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/**
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* MD5转字符串
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* 额外值
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*/
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public static String encodeMD52(String s) {
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char[] hexDigits = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
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try {
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byte[] btInput = s.getBytes(StandardCharsets.UTF_8);
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MessageDigest digest = MessageDigest.getInstance("MD5");
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digest.update(btInput);
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byte[] md = digest.digest();
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int j = md.length;
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char[] str = new char[j * 2];
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int k = 0;
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for (byte byte0 : md) {
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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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return new String(str);
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} catch (Exception e) {
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e.printStackTrace();
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return null;
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}
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}
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/**
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* MD5文件转字符串
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*/
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public static String encodeMD5(File f) {
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if (!f.isFile()) {
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return null;
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}
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MessageDigest digest;
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byte[] buffer = new byte[1024];
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int len;
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try {
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digest = MessageDigest.getInstance("MD5");
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FileInputStream in = new FileInputStream(f);
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while ((len = in.read(buffer, 0, 1024)) != -1) {
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digest.update(buffer, 0, len);
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}
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in.close();
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} catch (Exception e) {
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e.printStackTrace();
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return null;
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}
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BigInteger bigInt = new BigInteger(1, digest.digest());
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return bigInt.toString(16);
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}
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/**
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* MD5文件转字符串
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*/
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public static String encodeMD5(byte[] f) {
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MessageDigest digest;
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try {
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digest = MessageDigest.getInstance("MD5");
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digest.update(f);
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} catch (Exception e) {
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e.printStackTrace();
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return null;
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}
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BigInteger bigInt = new BigInteger(1, digest.digest());
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return bigInt.toString(16);
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}
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public final static String md5(String plainText) {
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// 返回字符串
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String md5Str = null;
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try {
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// 操作字符串
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StringBuffer buf = new StringBuffer();
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MessageDigest md =
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MessageDigest.getInstance("MD5");
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// 添加要进行计算摘要的信息,使用 plainText 的 byte
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md.update(plainText.getBytes());
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// 计算出摘要,完成哈希计算。
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byte b[] = md.digest();
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int i;
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for (int offset = 0; offset < b.length; offset++) {
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i = b[offset];
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if (i < 0) {
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i += 256;
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}
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if (i < 16) {
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buf.append("0");
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}
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// 将整型 十进制 i
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buf.append(Integer.toHexString(i));
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}
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// 32位的加密
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md5Str = buf.toString();
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// 16位的加密
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// md5Str = buf.toString().md5Strstring(8,24);
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} catch (Exception e) {
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e.printStackTrace();
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}
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return md5Str;
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}
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}
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