java - 如何处理 ifPresent 内部的异常？

Question

在方法内部，需要一个条件来执行逻辑。我的 IDE 中出现未处理的异常警告消息。用 try-catch 包裹整个 block 不会让消息消失。

public void changePassword(String login, String currentClearTextPassword, String newPassword) {

    userRepository.findOneByLogin(login)
            .ifPresent(user -> {
                String currentEncryptedPassword = user.getUserSecret();
                String encryptedInputPassword = "";
                try {
                    encryptedInputPassword = authUtils.encrypt(currentClearTextPassword);
                } catch (Exception ex) {
                    System.err.println("Encryption exception: " + ex.getMessage());
                }
                if (!Objects.equals(encryptedInputPassword, currentEncryptedPassword)) {
                    throw new Exception("Invalid Password");  // <-- unhandled exception
                }
                String encryptedNewPassword = "";
                try {
                    encryptedNewPassword = authUtils.encrypt(newPassword);
                } catch (Exception ex) {
                    System.err.println("Encryption exception: " + ex.getMessage());
                }
                user.setUserSecret(encryptedNewPassword);
                userRepository.save(user);
                log.debug("Changed password for User: {}", user);
            });
}

如何处理这个警告信息？

Answer 1

在流操作中处理异常有点开销，我想分离操作并使其像这样:

public void changePassword(String login, String currentClearTextPassword, String newPassword) throws Exception {
    //get the user in Optional
    Optional<User> check = userRepository.findOneByLogin(login);

    //if the user is present 'isPresent()'
    if(check.isPresent()){

        //get the user from the Optional and do your actions
        User user = check.get();

        String currentEncryptedPassword = user.getUserSecret();
        String encryptedInputPassword = "";
        try {
            encryptedInputPassword = authUtils.encrypt(currentClearTextPassword);
        } catch (Exception ex) {
            throw new Exception("Encryption exception: " + ex.getMessage());
        }
        if (!Objects.equals(encryptedInputPassword, currentEncryptedPassword)) {
            throw new Exception("Invalid Password");  // <-- unhandled exception
        }
        String encryptedNewPassword = "";
        try {
            encryptedNewPassword = authUtils.encrypt(newPassword);
        } catch (Exception ex) {
            throw new Exception("Encryption exception: " + ex.getMessage());
        }
        user.setUserSecret(encryptedNewPassword);
        userRepository.save(user);
        log.debug("Changed password for User: {}", user);
    }
}

除了打印之外，还应该抛出异常。