java中md5加密算法_MD5加密算法的java实现详解

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"));

}

}