JAVA 的MD5加密算法源代码-JSP教程,Java技巧及代码

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"));

}