Spring配置中的bean直接引用其它bean的属性值

水深无声 2022-04-03 06:16 231阅读 0赞

pring配置中的bean直接引用其它bean的属性值来赋值给当前bean的属性，也可以直接调用其它bean的方法获取返回值来赋值给当前bean的属性，并且可以进行参数传递，这样可以省去在bean中注入需要获取属性值的bean。

以下是一个完整的示例：

1、需要JAVA类：

Spring配置中的bean直接引用其它bean的属性值
    
    package com.service.test;
    public class Bean1 {
    	int v1 = 1;
    	public int getV1() {
    		return v1;
    	}
    	public void setV1(int v1) {
    		this.v1 = v1;
    	}
    	public int getTestValue(int v1) {
    		return v1;
    	}
    	public String getTestValue2(String str) {
    		return str;
    	}	
    }
    
    package com.service.test;
    public class Bean2 {
    	int v1;
    	int v2;
    	int v3;
    	String v4Str;
    	public int getV1() {
    		return v1;
    	}
    	public void setV1(int v1) {
    		this.v1 = v1;
    	}
    	public int getV2() {
    		return v2;
    	}
    	public void setV2(int v2) {
    		this.v2 = v2;
    	}	
    	public int getV3() {
    		return v3;
    	}
    	public void setV3(int v3) {
    		this.v3 = v3;
    	}
    	public String getV4Str() {
    		return v4Str;
    	}
    	public void setV4Str(String str) {
    		v4Str = str;
    	}	
    }
    package com.service.test;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    public class Test {
    	/**
    	 * @param args
    	 */
    	public static void main(String[] args) {
    		// TODO Auto-generated method stub
    		ApplicationContext context = new ClassPathXmlApplicationContext("testBean.xml");
    		Bean2 bean2 = (Bean2)context.getBean("bean2");
    		System.out.println(bean2.getV1());
    		System.out.println(bean2.getV2());
    		System.out.println(bean2.getV3());
    		System.out.println(bean2.getV4Str());
    	}
    }

2、需要XML配置：

<?xml version="1.0" encoding="UTF-8"?>
    <beans
    	xmlns="http://www.springframework.org/schema/beans"
    	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    	xsi:schemaLocation="
    		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd">
    			
    	<bean id="bean1" class="com.service.test.Bean1">
    	</bean>
    	<bean id="bean2" class="com.service.test.Bean2">
    		<property name="v1" value="#{bean1.v1}"/>
    		<property name="v2" value="#{bean1.getV1()}"/>
    		<property name="v3" value="#{bean1.getTestValue(3)}"/>
    		<property name="v4Str" value="#{'Hello '+bean1.getTestValue2('baby')}"/>
    	</bean>
    </beans>