密码加密代码

public class MD5 {
    public static String md5(String str) {
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            byte[] b1 = md.digest(str.getBytes());
            BASE64Encoder encoder = new BASE64Encoder();
            return encoder.encode(b1);
        } catch(Exception e) {
            return null;
        }
    }
     
    public static void main(String[] args) {
        System.out.println(md5("abc"));
    }
}