Spring-如何将Bean注入在运行时创建多次的类中？ [英] Spring - how to inject a bean into class which is created many times at runtime?

问题描述

我需要在应用程序启动时初始化bean，因此我在 applicationContext.xml 中进行了初始化。但是现在我需要将该bean注入到在运行时创建的对象中。示例：

I needed to initialize a bean at the application startup so I did that in applicationContext.xml. But now I need to inject that bean into an object which is created at runtime. Example:

Servlet

...
void doPost(...) {
    new Handler(request); 
}
...

处理程序

public class Handler {

    ProfileManager pm; // I need to inject this ???

    Handler(Request request) {
        handleRequest(request);
    }

    void handleRequest(Request request) {
        pm.getProfile(); // example
    }
}

推荐答案

更好的方法是也将Handler声明为Bean（假设已声明ProfileManager），然后如果在应用程序中使用批注，则使用注释@Autowired自动将Handler Bean中的ProfileManager进行连线，或者在应用程序内部applicationContext.xml。
如何在xml中执行此操作的示例可能是：

Better approach would be to declare the Handler as Bean as well - assuming that the ProfileManager is already declared - and then autowire the ProfileManager in the Handler bean either with the annotation @Autowired if you are using annotations in your apps, or inside the applicationContext.xml. An example of how to do it in the xml could be:

<bean id="profileManager" class="pckg.ProfileManager" />
<bean id="handler" class="pckg.Handler" >
 <property name="pm" ref="profileManager" />
</bean>

如果您不想像Bean那样注册Handler实例化，则从中获取pm实例春天的ApplicationContext。在此处

If you do NOT want to register Handler as bean instantiate it as you do and take the pm instance from spring's ApplicationContext. A way of how to get ApplicationContext inside a web app is shown here

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