spring之配置单例的集合bean,以供多个bean进行引用
发布时间:2020-12-15 01:13:22 所属栏目:大数据 来源:网络整理
导读:?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.s
<?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() { } Car(String name) { this.name = name; } private String name; String getName() { return name; } void setName(String name) { name; } @Override String toString() { return "Car [name=" + name + "]"; } } Student.java com.gong.spring.beans; import java.util.List; java.util.Map; Student { String name; private int age; double score; private List<Car> cars; getAge() { age; } void setAge( age) { this.age = getScore() { score; } void setScore( score) { this.score =public List<Car> getCars() { cars; } void setCars(List<Car> cars) { this.cars = cars; } @Override return "Student [name=" + name + ",age=" + age + ",score=" + score + ",cars=" + cars + "]"; } } Main.java org.springframework.context.ApplicationContext; org.springframework.context.support.ClassPathXmlApplicationContext; Main { static 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。? (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |