Java的MD5实现

rfcs:http://www.faqs.org/rfcs/rfc1321.html

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

public class MD5{
public String convert(String s){
char hexChars[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
try {
byte[] bytes = s.getBytes();
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(bytes);
bytes = md.digest();
int j = bytes.length;
char[] chars = new char[j * 2];
int k = 0;
for (int i = 0; i < bytes.length; i++) {
byte b = bytes[i];
chars[k++] = hexChars[b >>> 4 & 0xf];
chars[k++] = hexChars[b & 0xf];
}
return new String(chars);
}
catch (Exception e){
return null;
}
}

public static void main(String[] args){
System.out.println(new MD5().convert("0123456789"));
}