spring 自动装配在非 spring 托管类中不起作用 [英] spring autowiring not working from a non-spring managed class

问题描述

我有一个通过调用构造函数实例化的类(ABC 类).ABC 类又具有使用自动连线注入的辅助类(XYZ 类).

I have a class (Class ABC) that's instantiated by calling the constructor. Class ABC in turn has a helper class (Class XYZ) injected using auto-wired.

我们是一个基于 Spring MVC 的应用程序，我在服务器启动时没有看到任何异常.

Ours is a Spring MVC based application and I don't see any exception while server start-up.

但我仍然看到 XYZ 类为空.是不是因为Spring Container没有实例化ABC类?

But I still see Class XYZ coming as null. Is it because of the fact that Class ABC is not instantiated by Spring Container?

在这种情况下，如何使用自动布线?

In such scenarios, how do i make use of auto-wiring?

谢谢.

推荐答案

可以使用这种方式在非spring bean类中使用spring bean

You can use this way to use spring bean in non-spring bean class

import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

@Component
public class ApplicationContextUtils implements ApplicationContextAware {
     
      private static ApplicationContext ctx;
     
      @Override
      public void setApplicationContext(ApplicationContext appContext) {
        ctx = appContext;
      }
     
      public static ApplicationContext getApplicationContext() {
        return ctx;
      }
}

现在可以通过getApplicationContext()这个方法获取applicationcontext对象了.

now you can get the applicationcontext object by getApplicationContext() this method.

从 applicationcontext 你可以得到这样的 spring bean 对象:

from applicationcontext you can get spring bean objects like this:

ApplicationContext appCtx = ApplicationContextUtils.getApplicationContext();
String strFromContext = appCtx.getBean(beanName, String.class);

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