spring中的idref标签详解

2023-07-22 15:41:04

spring中的idref元素

idref元素是一个简单的对容器中存在的另外一个bean的检错途径（通过id）;

<idref
bean="someBeanId"/> ，不同于<ref/>
someBeanId注入的是一个字符串，相当于：

如果"someBeanId"不是其中一个bean的ID，将会报BeanDefinitionStoreException

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详细代码如下：

配置文件：idref_check.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:p="http://www.springframework.org/schema/p"

       xsi:schemaLocation="http://www.springframework.org/schema/beans

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

    <bean id="shihaofengqiu"

          class="beans.Song"

          p:title="十号风球"/>

    <bean id="xiaoming"

          class="beans.Singer">

        <property name="name" value="xiaoming"/>

        <!--<property name="song" value="mrfanl"/>-->

        <property name="song">

            <!--<idref bean="mrfanl"/>--><!--报错-->

            <idref bean="shihaofengqiu"/><!--通过-->

        </property>

    </bean>

</beans>

performer.java

package beans;

public interface Performer {

    public void play();

}

Singer.java

package beans;

public class Singer implements Performer {

    private String name;

    private String song;

    public Singer() {

    }

    public void setName(String name) {

        this.name = name;

    }

    public void setSong(String song) {

        this.song = song;

    }

    @Override

    public void play() {

        System.out.println("my name is:"+this.name);

        System.out.println("my song is:"+this.song);

    }

}

Song.java

package beans;

public class Song {

    private String title;

    public Song(){}

    public String getTitle() {

        return title;

    }

    public void setTitle(String title) {

        this.title = title;

    }

}

test.java

package main;

import beans.Performer;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class test {

    public static void main(String[] args){

        ApplicationContext ctx = new ClassPathXmlApplicationContext("idref_check.xml");

        Performer xiaoming = (Performer) ctx.getBean("xiaoming");

        xiaoming.play();

    }

}

结果：

码农公寓

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