md5加密算法的java实现

ztf880306

贡献于2011-08-04

字数:1207 关键词: Java开发

package other; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; /* * MD5 算法 */ public class MD5 { // 全局数组 private final static String[] strDigits = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" }; public MD5() { } // 返回形式为数字跟字符串 private static String byteToArrayString(byte bByte) { int iRet = bByte; // System.out.println("iRet="+iRet); if (iRet < 0) { iRet += 256; } int iD1 = iRet / 16; int iD2 = iRet % 16; return strDigits[iD1] + strDigits[iD2]; } // 返回形式只为数字 private static String byteToNum(byte bByte) { int iRet = bByte; System.out.println("iRet1=" + iRet); if (iRet < 0) { iRet += 256; } return String.valueOf(iRet); } // 转换字节数组为16进制字串 private static String byteToString(byte[] bByte) { StringBuffer sBuffer = new StringBuffer(); for (int i = 0; i < bByte.length; i++) { sBuffer.append(byteToArrayString(bByte[i])); } return sBuffer.toString(); } public static String GetMD5Code(String strObj) { String resultString = null; try { resultString = new String(strObj); MessageDigest md = MessageDigest.getInstance("MD5"); // md.digest() 该函数返回值为存放哈希值结果的byte数组 resultString = byteToString(md.digest(strObj.getBytes())); } catch (NoSuchAlgorithmException ex) { ex.printStackTrace(); } return resultString; } public static void main(String[] args) { MD5 getMD5 = new MD5(); System.out.println(getMD5.GetMD5Code("000000")); } }

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