Java实现MD5加密解密类(2)

public class Client {
 private static Map users = new HashMap();
 
 public static void main(String[] args){
  String userName = "zyg";
  String password = "123";
  registerUser(userName,password);
 
  userName = "changong";
  password = "456";
  registerUser(userName,password);
 
  String loginUserId = "zyg";
  String pwd = "1232";
  try {
   if(loginValid(loginUserId,pwd)){
    System.out.println("欢迎登陆！！！");
   }else{
    System.out.println("口令错误，请重新输入！！！");
   }
  } catch (NoSuchAlgorithmException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (UnsupportedEncodingException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
 }
 
 /**
  * 注册用户
  *
  * @param userName
  * @param password
  */
 public static void registerUser(String userName,String password){
  String encryptedPwd = null;
  try {
   encryptedPwd = MyMD5Util.getEncryptedPwd(password);
   
   users.put(userName, encryptedPwd);
   
  } catch (NoSuchAlgorithmException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (UnsupportedEncodingException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
 }
 
 /**
  * 验证登陆
  *
  * @param userName
  * @param password
  * @return
  * @throws UnsupportedEncodingException
  * @throws NoSuchAlgorithmException
  */
 public static boolean loginValid(String userName,String password)
    throws NoSuchAlgorithmException, UnsupportedEncodingException{
  String pwdInDb = (String)users.get(userName);
  if(null!=pwdInDb){ // 该用户存在
    return MyMD5Util.validPassword(password, pwdInDb);
  }else{
   System.out.println("不存在该用户！！！");
   return false;
  }
 }
}

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