Spring：为每次调用get方法创建bean的新实例 [英] Spring: Create new instance of bean for each call of get method

问题描述

我有下一种情况：
连接管理器每次都应该有一个 ConnectionServer 的对象和新的 DataBean的对象
因此，我创建了这些bean并将其配置为spring xml。

I have next situation: Connection manager should have each time one object of ConnectionServer and new objects of DataBean So, I have created these beans and configured out it spring xml.

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

    <bean id="dataBena" class="com.test.DataBean" scope="prototype"/>
    <bean id="servCon" class="com.test.ServerCon"/>
    <!--<bean id="test" class="com.test.Test"/>-->
     <context:component-scan base-package="com.test"/>
</beans>

并为<$ c添加范围 prototype $ c> DataBean

and added scope prototype for DataBean

在此之后我创建了名为Test的简单的util / component类

After this I've created simple util/component class called Test

@Component
public class Test {

    @Autowired
    private DataBean bean;
    @Autowired
    private ServerCon server;

    public DataBean getBean() {
        return bean.clone();
    }

    public ServerCon getServer() {
        return server;
    }

}

但是，每次调用getBean （）方法我正在克隆这个bean，这对我来说是个问题。
我可以从spring配置执行此操作而不使用克隆方法吗？
谢谢。

BUT, Each time of calling getBean() method I am cloning this bean, and this is the problem to me. Can I do it from spring configuration without usning clone method? Thanks.

推荐答案

您正在寻找查找方法功能。这个想法是你提供这样的抽象方法：

You are looking for lookup method functionality in Spring. The idea is that you provide an abstract method like this:

@Component
public abstract class Test {
  public abstract DataBean getBean();
}

告诉Spring它应该在运行时实现它：

And tell Spring that it should implement it at runtime:

<bean id="test" class="com.test.Test">
  <lookup-method name="getBean" bean="dataBean"/>
</bean>

现在每次调用 Test.getBean 你实际上会调用Spring生成的方法。此方法将为 DataBean 实例请求 ApplicationContext 。如果这个bean是 prototype -scoped，那么每次调用它时都会得到新实例。

Now every time you call Test.getBean you will actually call Spring-generated method. This method will ask ApplicationContext for DataBean instance. If this bean is prototype-scoped, you will get new instance each time you call it.

我写的关于此功能此处。

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