package com.xu.utlis; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.nio.MappedByteBuffer; import java.nio.channels.FileChannel; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; /** * @FileName MD5Helper.java * @Description: * MD5加密解密 * @author * @version 1.0 * */ public class MD5Helper { private final static String KEY_MD5 = "MD5"; private final static String KEY_SHA = "SHA-512"; private static char hexChars[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' }; public static void main(String[] args) { String password="123456"; String encryPasswordStr = encrypt32MD5(password); System.out.println(encryPasswordStr); } /** * 返回32位MD5加密密码 * * @param value * 加密串 * @return */ public static String encrypt32MD5(String value) { try { byte[] bytes = value.getBytes(); MessageDigest md = MessageDigest.getInstance(KEY_MD5); md.update(bytes); bytes = md.digest(); int j = bytes.length; char[] chars = new char[j * 2]; int k = 0; for (int i = 0; i < bytes.length; i++) { byte b = bytes[i]; chars[k++] = hexChars[b >>> 4 & 0xf]; chars[k++] = hexChars[b & 0xf]; } return new String(chars); } catch (NoSuchAlgorithmException e) { return null; } } /** * 返回16位MD5加密密码 * * @param value * 加密串 * @return */ public static String encrypt16MD5(String value) { try { byte[] bytes = value.getBytes(); MessageDigest md = MessageDigest.getInstance(KEY_MD5); md.update(bytes); bytes = md.digest(); int j = bytes.length; char[] chars = new char[j * 2]; int k = 0; for (int i = 0; i < bytes.length; i++) { byte b = bytes[i]; chars[k++] = hexChars[b >>> 4 & 0xf]; chars[k++] = hexChars[b & 0xf]; } return new String(chars).substring(8, 24); } catch (NoSuchAlgorithmException e) { return null; } } /** * 返回32位SHA加密密码(注:SHA比md5安全) * * @param value * 加密串 * @return */ public static String encrypt32SHA(String value) { try { byte[] bytes = value.getBytes(); MessageDigest md = MessageDigest.getInstance(KEY_SHA); md.update(bytes); bytes = md.digest(); int j = bytes.length; char[] chars = new char[j * 2]; int k = 0; for (int i = 0; i < bytes.length; i++) { byte b = bytes[i]; chars[k++] = hexChars[b >>> 4 & 0xf]; chars[k++] = hexChars[b & 0xf]; } return new String(chars); } catch (NoSuchAlgorithmException e) { return null; } } /** * 返回16位SHA加密密码(SHA比md5安全) * * @param value * 加密串 * @return */ public static String encrypt16SHA(String value) { try { byte[] bytes = value.getBytes(); MessageDigest md = MessageDigest.getInstance(KEY_SHA); md.update(bytes); bytes = md.digest(); int j = bytes.length; char[] chars = new char[j * 2]; int k = 0; for (int i = 0; i < bytes.length; i++) { byte b = bytes[i]; chars[k++] = hexChars[b >>> 4 & 0xf]; chars[k++] = hexChars[b & 0xf]; } return new String(chars).substring(8, 24); } catch (NoSuchAlgorithmException e) { return null; } } /** * 获取文件的MD5值 * * @param file 文件 * @return * @throws IOException */ public static String fileMD5(File file) throws IOException { MessageDigest messagedigest; try { messagedigest = MessageDigest.getInstance(KEY_MD5); FileInputStream in = new FileInputStream(file); FileChannel ch = in.getChannel(); MappedByteBuffer byteBuffer = ch.map(FileChannel.MapMode.READ_ONLY, 0, file.length()); messagedigest.update(byteBuffer); return bufferToHex(messagedigest.digest()); } catch (NoSuchAlgorithmException e) { return null; } } private static String bufferToHex(byte bytes[]) { return bufferToHex(bytes, 0, bytes.length); } private static String bufferToHex(byte bytes[], int m, int n) { StringBuffer stringbuffer = new StringBuffer(2 * n); int k = m + n; for (int l = m; l < k; l++) { appendHexPair(bytes[l], stringbuffer); } return stringbuffer.toString(); } private static void appendHexPair(byte bt, StringBuffer stringbuffer) { char c0 = hexChars[(bt & 0xf0) >> 4]; char c1 = hexChars[bt & 0xf]; stringbuffer.append(c0); stringbuffer.append(c1); } }
MD5工具类
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转载自weifengxuxu.iteye.com/blog/2230651
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