@@ Autowired bean在静态方法中为null

Question

我有两个类名，分别是Bean类和Util类。在Util类中，我想从Bean类中调用该方法。但问题是，当我@Autowired将Bean类自动转换为Util类时。由于Util类使用静态方法，因此存在空指针异常。这是我的代码。

public class Util{

@Autowired
private static BaseServiceCommonPropertiesBean baseServiceCommonPropertiesBean;

private static String PASSPHRASE = baseServiceCommonPropertiesBean.getBassURL();
System.out.print(PASSPHRASE);

}

这里是BaseServiceCommonPropertiesBean类

public class BaseServiceCommonPropertiesBean {

@Value("#{baseServiceapplicationProperties['mobi.sc.travellers.amr.email.base.url']}")
    private String baseUrl;

public String getBaseUrl(){
        return baseUrl;
    }

}

[无论何时系统读取baseServiceCommonPropertiesBean.getPassPhrase（）方法。它熄灭并停止工作。我尝试了@Postconstruct批注，然后它不起作用。谢谢。

Answer 1

您不能@Autowired静态字段，请从BaseServiceCommonPropertiesBean删除静态或将您的Util重写为如下所示：

@Component
public class Util{

private static BaseServiceCommonPropertiesBean baseServiceCommonPropertiesBean;

@Autowired
    public void setBaseServiceCommonPropertiesBean(BaseServiceCommonPropertiesBean baseServiceCommonPropertiesBean){
        Util.baseServiceCommonPropertiesBean = baseServiceCommonPropertiesBean;
    }

private static String PASSPHRASE = baseServiceCommonPropertiesBean.getBassURL();
System.out.print(PASSPHRASE);

}

Answer 2

添加注释会很好用，它们可以是@Service或@Component之类的东西

@Service
public class BaseServiceCommonPropertiesBean {

  @Value("#{baseServiceapplicationProperties['mobi.sc.travellers.amr.email.base.url']}")
  private String baseUrl;

  public String getBaseUrl() { 
        return baseUrl;
  }
}