<?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:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.3.xsd">
<bean id="car1" class="com.gong.spring.beans.Car">
<property name="name" value="baoma"></property>
</bean>
<bean id="car2" class="com.gong.spring.beans.Car">
<property name="name" value="benchi"></property>
</bean>
<bean id="car3" class="com.gong.spring.beans.Car">
<property name="name" value="binli"></property>
</bean>
<bean id="student" class="com.gong.spring.beans.Student">
<property name="name" value="tom"></property>
<property name="age" value="12"></property>
<property name="score" value="98.00"></property>
<property name="cars">
<!-- 使用List节点为List集合属性赋值
<list>
<ref bean="car1"/>
<ref bean="car2"/>
<ref bean="car3"/>
</list>
</property>
</bean>
</beans>
这种情况下,是在一个bean的里面进行配置的,假设现在我们有另外一个bean,也需要使用List集合里的bean,那么应该怎么做呢?
首先,引入命名空间util,在applicationContext.xml下方的namespace里面,勾选下即可。如果没有,则需要安装Spring Tool Suite(STS) for Eclipse,具体装法可百度。
然后配置一个公用集合bean:
<util:list id="cars">
<ref bean="car1"/>
<ref bean="car2"/>
<ref bean="car3"/>
</util:list>
此时可去掉上述代码中的红色部分,并这样使用:
<property name="cars" ref="cars">
补充其它代码:
Car.java
package com.gong.spring.beans;
public class Car {
public Car() {
}
public Car(String name) {
this.name = name;
}
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "Car [name=" + name + "]";
}
}
Student.java
package com.gong.spring.beans;
import java.util.List;
import java.util.Map;
public class Student {
private String name;
private int age;
private double score;
private List<Car> cars;
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 double getScore() {
return score;
}
public void setScore(double score) {
this.score = score;
}
public List<Car> getCars() {
return cars;
}
public void setCars(List<Car> cars) {
this.cars = cars;
}
@Override
public String toString() {
return "Student [name=" + name + ", age=" + age + ", score=" + score + ", cars=" + cars + "]";
}
}
Main.java
package com.gong.spring.beans;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Main {
public static void main(String[] args) {
//1.创建spring的IOC容器对象
ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
//2.从容器中获取Bean实例
Student student = (Student) ctx.getBean("student");
System.out.println(student.toString());
}
}
输出:
顺便看一下util中都有什么:
对于不同的集合,按照其相应的语法进行配置即可。