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@doubledouble doubledouble/MD5Util
Created Jul 29, 2012

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MD5Util
/*
* Classname : MD5Util
* Create Date : Aug 15, 2006
*/
import java.security.MessageDigest;
/**
*
* JAVA MD5加密
*
* @author Larry
*
* @version 1.0
*/
public class MD5Util {
public MD5Util() {
}
private final static String[] hexDigits = { "0", "1", "2", "3", "4", "5",
"6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
/**
* 转换字节数组为16进制字串
* @param b 字节数组
* @return 16进制字串
*/
public static String byteArrayToString(byte[] b) {
StringBuffer resultSb = new StringBuffer();
for (int i = 0; i < b.length; i++) {
resultSb.append(byteToHexString(b[i]));//若使用本函数转换则可得到加密结果的16进制表示,即数字字母混合的形式
//resultSb.append(byteToNumString(b[i]));//使用本函数则返回加密结果的10进制数字字串,即全数字形式
}
return resultSb.toString();
}
private static String byteToNumString(byte b) {
int _b = b;
if (_b < 0) {
_b = 256 + _b;
}
return String.valueOf(_b);
}
private static String byteToHexString(byte b) {
int n = b;
if (n < 0) {
n = 256 + n;
}
int d1 = n / 16;
int d2 = n % 16;
return hexDigits[d1] + hexDigits[d2];
}
public static String MD5Encode(String origin) {
String resultString = null;
try {
resultString = new String(origin);
MessageDigest md = MessageDigest.getInstance("MD5");
resultString = byteArrayToString(md.digest(resultString.getBytes()));
} catch (Exception ex) {
}
return resultString;
}
/**
* 进行md5字符中的比较
* @param md5a String
* @param md5b String
* @return boolean
*/
public static boolean compareMD5(String md5a, String md5b) {
boolean flag = false;
if (md5a == md5b) {
return true;
}
try {
java.security.MessageDigest alga = java.security.MessageDigest.getInstance("MD5");
flag = alga.isEqual(md5a.getBytes(), md5b.getBytes());
} catch (Exception ex) {
}
return flag;
}
public static void main(String args[]) {
String m = MD5Util.MD5Encode("aisa100");
System.out.println(m);
String m1 = MD5Util.MD5Encode("fb271113cf95966bfc917a735d065ffa");
System.out.println(m1);
System.out.println(MD5Util.compareMD5(m1, m));
}
}
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