📅  最后修改于: 2020-12-04 07:43:10             🧑  作者: Mango
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,我们的场景是Employee HAS-A Address 。 Address类对象将称为从属对象。让我们首先看一下Address类:
此类包含四个属性,即setter和getter以及toString()方法。
package com.javatpoint;
public class Address {
private String addressLine1,city,state,country;
//getters and setters
public String toString(){
return addressLine1+" "+city+" "+state+" "+country;
}
它包含三个属性id,name和address(从属对象),带有setInfo和getter的displayInfo()方法。
package com.javatpoint;
public class Employee {
private int id;
private String name;
private Address address;
//setters and getters
void displayInfo(){
System.out.println(id+" "+name);
System.out.println(address);
}
}
属性元素的ref属性用于定义另一个bean的引用。
此类从applicationContext.xml文件获取Bean,然后调用displayInfo()方法。
package com.javatpoint;
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();
}
}