java - 使用 Spring 读取属性会引发异常

Question

我正在尝试使用 Spring 从文件中读取属性。但是我不断得到 NullPointerExceptions。我不确定我做错了什么，因为我已经在RestController课堂上通过@Configuration注释完成了这项工作。

@Component
@PropertySource("classpath:recaptcha.properties")
public class RecaptchaProvider {

  @Value("${com.xxx.user.recaptcha.verify.secret}")
  private String secret;

  @Value("${com.xxx.user.recaptcha.verify.url}")
  private String serviceUrl;

  public RecaptchaProvider() {
    //do nothing
  }

  public String getSecret() {
    return secret;
  }

  public String getServiceUrl() {
    return serviceUrl;
  }
}

我的来电者类：

@Component
public class RecaptchaServiceImpl implements RecaptchaService {

  @Autowired
  RecaptchaProvider provider;

  @Override
  public boolean isCaptchaValid(String response) {
    String secret = provider.getSecret(); // Nullpointer here
    String serviceUrl = provider.getServiceUrl();

    CaptchaValidation captchaValidator = new CaptchaValidation();
    ReCaptchaVerfiyResponse result =
        captchaValidator.postForCaptchaValidation(secret, response, serviceUrl);

    return Boolean.valueOf(result.getSuccess());
  }
}

项目设置：

在我的属性文件中：

com.xxx.user.recaptcha.verify.url=https://www.google.com/recaptcha/api/siteverify
com.xxx.user.recaptcha.verify.secret=xxxxxxxxxxxx

例外：

java.lang.NullPointerException
    at com.xxx.user.recaptcha.impl.RecaptchaServiceImpl.isCaptchaValid(RecaptchaServiceImpl.java:24)
    at com.xxx.rest.user.impl.UserController.checkReCaptcha(UserController.java:135)
    at com.xxx.rest.user.impl.UserController.addUser(UserController.java:87)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136)

Answer 1

好的，感谢 M.Deinum “猜测”，我解决了这个问题。我没有意识到我将 bean 与组件混合并忘记了“新”搞砸了 spring lfc

现在看起来像这样

@Component
public class RecaptchaProvider {

  private String secret;

  private String serviceUrl;


  public RecaptchaProvider(String secret, String serviceUrl) {
    this.secret = secret;
    this.serviceUrl = serviceUrl;
  }

  public String getSecret() {
    return secret;
  }

  public String getServiceUrl() {
    return serviceUrl;
  }
}

财产提供者

@Configuration
@PropertySource("classpath:recaptcha.properties")
public class RecaptchaConfig {

  @Value("${com.xxx.user.recaptcha.verify.secret}")
  private String secret;

  @Value("${com.xxx.user.recaptcha.verify.url}")
  private String serviceUrl;

  @Bean
  public RecaptchaProvider getRecaptchaConfig() {
    return new RecaptchaProvider(secret,serviceUrl);
  }
}

服务

  @Autowired
  RecaptchaConfig config;

  @Override
  public boolean isCaptchaValid(String response) {
    RecaptchaProvider provider = config.getRecaptchaConfig();
    String secret = provider.getSecret();
      String serviceUrl = provider.getServiceUrl();
      CaptchaValidation captchaValidator = new CaptchaValidation();
      ReCaptchaVerfiyResponse result =
          captchaValidator.postForCaptchaValidation(secret, response, serviceUrl);

      return Boolean.valueOf(result.getSuccess());
  }
}

最后是我的控制器中的方法

  @Autowired
  protected RecaptchaServiceImpl recaptchaService;

  private boolean checkReCaptcha(String captchaResponse){
    return recaptchaService.isCaptchaValid(captchaResponse);
  }