Question

这是我的代码：

package foo.bar;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class SpringTest {

    public static void main(String[] args){
        AbstractApplicationContext kontekst = new ClassPathXmlApplicationContext("spring.xml");
        kontekst.registerShutdownHook();
        Shape trojkat = (Shape) kontekst.getBean("Circle");
        trojkat.draw();
    }
}

Circle.class

package foo.bar;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.annotation.Resource;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Required;
import org.springframework.stereotype.Component;

@Component
public class Circle implements Shape{

        private Point center;

        @Override
        public void draw() {
                System.out.println("Drawin circle");
                System.out.println("the point is x:"+center.getX()+", y="+center.getY());

        }
        public Point getCenter() {
                return center;
        }

        @Resource
        public void setCenter(Point center) {
                this.center = center;
        }
        @PostConstruct
        public void initalizeCircle(){
                System.out.println("init of circle");
        }
        @PreDestroy
        public void destroyCricle(){
                System.out.println("destroying circle");
        }

}

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-3.0.xsd
          http://www.springframework.org/schema/context
          http://www.springframework.org/schema/context/spring-context-3.0.xsd">

   <context:annotation-config/>
   <context:component-scan base-package="foo.bar"/>

   <bean id="pointA" class="foo.bar.Point">
       <qualifier value="test"/>
           <property name="x" value="0"/>
           <property name="y" value="0"/>
   </bean>

    <bean id="pointB" class="foo.bar.Point">
        <property name="x" value="60"/>
        <property name="y" value="40"/>
    </bean>    

    <bean id="center" class="foo.bar.Point">
        <property name="x" value="20"/>
        <property name="y" value="30"/>
    </bean>  
</beans>

我尝试过多种方式，更改源名称。

当我将xml更改为

时

<bean id="Circle" class="foo.bar.Circle">
</bean>

Eveyrthing很好，但我想知道为什么，我是Spring的新手。我在stackoverflow上寻找类似的主题，但我无法解决我的问题。

Answer 1

默认情况下，bean的名称将是以小写字母开头的类的名称。所以，你没有"Circle" bean，你有一个"circle" bean。试试这个：

Shape trojkat = (Shape) kontekst.getBean("circle");

context：component -scan无法正常工作

1 个答案: