spring中bean 之间的关系（继承；依赖；引用）实例分析如下
People类
package com.java1234.entity;
public class People {
private int id;
private String name;
private int age;
private String className;
private Dog dog;
public People() {
System.out.println("初始化People");
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getClassName() {
return className;
}
public void setClassName(String className) {
this.className = className;
}
public Dog getDog() {
return dog;
}
public void setDog(Dog dog) {
this.dog = dog;
}
@Override
public String toString() {
return "People [id=" + id + ", name=" + name + ", age=" + age
+ ", className=" + className + ", dog=" + dog + "]";
}
}
Dog类
package com.java1234.entity;
public class Dog {
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
权限类Authority.java
package com.java1234.service;
public class Authority {
public Authority() {
System.out.println("获取权限");
}
}
beans.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"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="dog" class="com.java1234.entity.Dog">
<property name="name" value="jack"></property>
</bean>
<bean id="abstractPeople" class="com.java1234.entity.People" abstract="true">
<property name="className" value="高三5班"></property>
<property name="age" value="19"></property>
</bean>
<bean id="zhangsan" parent="abstractPeople" depends-on="autority">
<property name="id" value="1"></property>
<property name="name" value="张三"></property>
</bean>
<bean id="lisi" parent="abstractPeople">
<property name="id" value="2"></property>
<property name="name" value="李四"></property>
<property name="age" value="20"></property>
<property name="dog" ref="dog"></property>
</bean>
<bean id="autority" class="com.java1234.service.Authority"></bean>
</beans>
测试类
package com.java1234.test;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.java1234.entity.People;
public class T {
private ApplicationContext ac;
@Before
public void setUp() throws Exception {
ac=new ClassPathXmlApplicationContext("beans.xml");
}
@Test
public void test1() {
People zhangsan=(People)ac.getBean("zhangsan");
System.out.println(zhangsan);
People lisi=(People)ac.getBean("lisi");
System.out.println(lisi);
}
}
beans.xml中zhangsan和lisi继承"abstractPeople的属性
输出结果为
引用的话是people中引用dog这个bean
依赖解释：未加depends-on="autority"之前，输出中会先初始化zhangsan，再初始化autority，加了就会相反。
使zhangsan依赖与autority，得先加载autority，输出结果自然先打印获取权限，然后才是初始化People。