Md5加密

import java.security.MessageDigest;

public class Md5 {

public static String MD5(String s)
{
char hexDigits[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd','e', 'f','g','h','i','j','k','m'};

try
{
byte[] strTemp = s.getBytes("GBK");
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)
{
System.out.println("------------md5:"+e);
e.printStackTrace();
return null;
}
}

public static void main(String[] args) {

System.out.println(MD5("zhangjun"));

}

}