以静态方法访问spring bean [英] Accessing spring beans in static method

问题描述

我有一个带有静态方法的Util类。在我的Util类中，我想使用spring bean，所以我将它们包含在我的util类中。
据我所知，将spring bean用作静态字段并不是一个好习惯。
但是有没有办法以静态方法访问spring bean？

I have a Util class with static methods. Inside my Util class, I want to use spring beans so I included them in my util class. As far as I know it's not a good practice to use spring beans as static fields. But is there any way to access spring beans in a static method?

我的例子：

public class TestUtils {

   private static TestBean testBean;

   public void setTestBean(TestBean testBean) {
     TestUtils.testBean = testBean;
   }

  public static String getBeanDetails() {
    return beanName = testBean.getDetails();
  }
}

我在很多论坛上看到这不是最佳实践。有人能告诉我如何处理这种情况吗？

I have seen in many forums that this is not a best practice. Can someone show me how I can handle this type of scenario?

我的配置文件：

<bean id="testUtils" class="com.test.TestUtils">
 <property name="testBean" ref="testBean" />
</bean>

推荐答案

我的方法是针对想要访问的bean实现 InitializingBean 或使用 @PostConstruct ，并包含对自身的静态引用。

My approach is for the bean one wishes to access to implement InitializingBean or use @PostConstruct, and containing a static reference to itself.

例如：

@Service
public class MyBean implements InitializingBean {
    private static MyBean instance;

    @Override
    public void afterPropertiesSet() throws Exception {
        instance = this;
    }

    public static MyBean get() {
        return instance;
    }
}

因此，静态类中的用法只是：

Usage in your static class would therefore just be:

MyBean myBean = MyBean.get();

这样，不需要XML配置，你不需要将bean作为一个传递来构造函数参数，并且调用者不需要知道或关心bean是否使用Spring连接（即，不需要凌乱的 ApplicationContext 变量）。

This way, no XML configuration is required, you don't need to pass the bean in as a constructor argument, and the caller doesn't need to know or care that the bean is wired up using Spring (i.e., no need for messy ApplicationContext variables).

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