Spring带有依赖对象的Setter注入示例 _SpringBean

有依赖对象的Setter注入

像构造函数注入一样, 我们可以使用setter注入另一个bean的依赖项。在这种情况下, 我们使用property元素。在这里, 我们的方案是员工HAS-A地址。 Address类对象将称为从属对象。让我们首先看一下Address类：
Address.java
此类包含四个属性, 即setter和getter以及toString()方法。

package com.srcmini; public class Address { private String addressLine1, city, state, country; //getters and setterspublic String toString(){ return addressLine1+" "+city+" "+state+" "+country; }

【Spring带有依赖对象的Setter注入示例】Employee.java
它包含三个属性id, name和address(相关对象), 带有setInfo和getter的displayInfo()方法。

package com.srcmini; public class Employee { private int id; private String name; private Address address; //setters and gettersvoid displayInfo(){ System.out.println(id+" "+name); System.out.println(address); } }

applicationContext.xml
属性元素的ref属性用于定义另一个bean的引用。

< ?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-3.0.xsd"> < bean id="address1" class="com.srcmini.Address"> < property name="addressLine1" value="http://www.srcmini.com/51, Lohianagar"> < /property> < property name="city" value="http://www.srcmini.com/Ghaziabad"> < /property> < property name="state" value="http://www.srcmini.com/UP"> < /property> < property name="country" value="http://www.srcmini.com/India"> < /property> < /bean> < bean id="obj" class="com.srcmini.Employee"> < property name="id" value="http://www.srcmini.com/1"> < /property> < property name="name" value="http://www.srcmini.com/Sachin Yadav"> < /property> < property name="address" ref="address1"> < /property> < /bean> < /beans>

Test.java
此类从applicationContext.xml文件获取Bean, 然后调用displayInfo()方法。

package com.srcmini; import org.springframework.beans.factory.BeanFactory; import org.springframework.beans.factory.xml.XmlBeanFactory; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import org.springframework.core.io.ClassPathResource; import org.springframework.core.io.Resource; public class Test { public static void main(String[] args) { Resource r=new ClassPathResource("applicationContext.xml"); BeanFactory factory=new XmlBeanFactory(r); Employee e=(Employee)factory.getBean("obj"); e.displayInfo(); } }

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