MD5數據簡單加密算法

import java.security.*;
import java.security.spec.*;

/**
* <p>Title:java的MD5加密算法實現 </p>
* <p>Description: </p>
* <p>Copyright: Copyright (c) 2007</p>
* <p>Company: </p>
* @author not attributable
* @version 1.0
*/
class MD5_Test {
public final static String MD5(String s) {
char hexDigits[] = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd',
'e', 'f'};//裏面的字符是不可以隨便改的，因爲這是一個16進制的字符，它是按照16進制去轉碼的
try {
byte[] strTemp = s.getBytes();
MessageDigest mdTemp = MessageDigest.getInstance("MD5");
mdTemp.update(strTemp);
byte[] md = mdTemp.digest();
int j = md.length;
char str[] = new char[j * 2];
int k = 0;
for (int i = 0; i < j; i++) {
byte byte0 = md[i];
str[k++] = hexDigits[byte0 >>> 4 & 0xf];
str[k++] = hexDigits[byte0 & 0xf];
}
return new String(str);
}
catch (Exception e) {
return null;
}
}

public static void main(String[] args) {
System.out.print("加密後的數據爲:"+MD5_Test.MD5("XX"));
}
}