JAVA 的MD5加密算法源代码

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

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@#};
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){
//MD5_Test aa = new MD5_Test();

System.out.print(MD5_Test.MD5("XX"));
}

原文转自：http://www.ltesting.net