Spring学习--集合属性

集合属性

Spring 中可以通过一组内置的 xml 标签(例如: <list> , <set> 或 <map>) 来配置集合属性。

配置java.util.Set 需要使用 <set> 标签 , 定义元素的方法与 List 一样。

下面我们就以 List 和 Map 为例：

配置List属性

 <?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="person" class="com.itdoc.spring.beans.Person">
         <property name="name" value="华崽儿"/>
         <property name="sex" value="女"/>
         <property name="age" value="27"/>
         <property name="cars">
             <list>
                 <ref bean="car1"/>
                 <ref bean="car2"/>   <!--可引入 Bean , 也可用内部 Bean-->
                 <bean id="car3" class="com.itdoc.spring.beans.Car">
                     <property name="brand" value="Ferrari"/>
                     <property name="price" value="22500000"/>
                     <property name="maxSpeed" value="330"/>
                 </bean>
             </list>
         </property>
     </bean>

     <bean id="car1" class="com.itdoc.spring.beans.Car">
         <property name="brand" value="Lamborghini"/>
         <property name="price" value="27000000"/>
         <property name="maxSpeed" value="300"/>
     </bean>
     <bean id="car2" class="com.itdoc.spring.beans.Car">
         <property name="brand" value="Rolls-Royce"/>
         <property name="price" value="24500000"/>
         <property name="maxSpeed" value="310"/>
     </bean>

 </beans>

 package com.itdoc.spring.beans;

 /**
  * 集合中的对象
  * http://www.cnblogs.com/goodcheap
  *
  * @author: Wáng Chéng Dá
  * @create: 2017-02-28 19:56
  */
 public class Car {

     private String brand;

     private double price;

     private int maxSpeed;

     public String getBrand() {
         return brand;
     }

     public void setBrand(String brand) {
         this.brand = brand;
     }

     public double getPrice() {
         return price;
     }

     public void setPrice(double price) {
         this.price = price;
     }

     public int getMaxSpeed() {
         return maxSpeed;
     }

     public void setMaxSpeed(int maxSpeed) {
         this.maxSpeed = maxSpeed;
     }

     @Override
     public String toString() {
         return "Car{" +
                 "brand='" + brand + '\'' +
                 ", price=" + price +
                 ", maxSpeed=" + maxSpeed +
                 '}';
     }
 }

 package com.itdoc.spring.beans;

 import java.util.List;

 /**
  * 集合属性注入
  * http://www.cnblogs.com/goodcheap
  *
  * @author: Wáng Chéng Dá
  * @create: 2017-02-28 19:58
  */
 public class Person {

     private String name;

     private String sex;

     private int age;

     private List<Car> cars;

     public String getName() {
         return name;
     }

     public void setName(String name) {
         this.name = name;
     }

     public String getSex() {
         return sex;
     }

     public void setSex(String sex) {
         this.sex = sex;
     }

     public int getAge() {
         return age;
     }

     public void setAge(int age) {
         this.age = age;
     }

     public List<Car> getCars() {
         return cars;
     }

     public void setCars(List<Car> cars) {
         this.cars = cars;
     }

     @Override
     public String toString() {
         return "Person{" +
                 "name='" + name + '\'' +
                 ", sex='" + sex + '\'' +
                 ", age=" + age +
                 ", cars=" + cars +
                 '}';
     }
 }

 package com.itdoc.spring.beans;

 import org.springframework.context.ApplicationContext;
 import org.springframework.context.support.ClassPathXmlApplicationContext;

 /**
  * http://www.cnblogs.com/goodcheap
  *
  * @author: Wáng Chéng Dá
  * @create: 2017-02-28 20:12
  */
 public class Main {

     public static void main(String[] args) {

         ApplicationContext app = new ClassPathXmlApplicationContext("applicationConfig.xml");
         Person person = (Person) app.getBean("person");
         System.out.println(person);

     }
 }

控制台输出：

Person{name='华崽儿', sex='女', age=27, cars=[Car{brand='Lamborghini', price=2.7E7, maxSpeed=300}, Car{brand='Rolls-Royce', price=2.45E7, maxSpeed=310}, Car{brand='Ferrari', price=2.25E7, maxSpeed=330}]}

配置Map属性

 <?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="person" class="com.itdoc.spring.map.Person">
         <property name="name" value="华崽儿"/>
         <property name="sex" value="女"/>
         <property name="age" value="28"/>
         <property name="cars">
             <map>
                 <entry key="Lamborghini" value-ref="car1"/>
                 <entry key="Rolls-Royce" value-ref="car2"/> <!--可以引入 Bean , 也可用内部 Bean-->
                 <entry key="Ferrari">
                     <bean id="car3" class="com.itdoc.spring.beans.Car">
                         <property name="brand" value="Ferrari"/>
                         <property name="price" value="22500000"/>
                         <property name="maxSpeed" value="330"/>
                     </bean>
                 </entry>
             </map>
         </property>
     </bean>

     <bean id="car1" class="com.itdoc.spring.beans.Car">
         <property name="brand" value="Lamborghini"/>
         <property name="price" value="27000000"/>
         <property name="maxSpeed" value="300"/>
     </bean>

     <bean id="car2" class="com.itdoc.spring.beans.Car">
         <property name="brand" value="Rolls-Royce"/>
         <property name="price" value="24500000"/>
         <property name="maxSpeed" value="310"/>
     </bean>

 </beans>

 package com.itdoc.spring.map;

 import com.itdoc.spring.beans.Car;

 import java.util.Map;

 /**
  * 集合属性注入
  * http://www.cnblogs.com/goodcheap
  *
  * @author: Wáng Chéng Dá
  * @create: 2017-02-28 19:58
  */
 public class Person {

     private String name;

     private String sex;

     private int age;

     private Map<String, Car> cars;

     public String getName() {
         return name;
     }

     public void setName(String name) {
         this.name = name;
     }

     public String getSex() {
         return sex;
     }

     public void setSex(String sex) {
         this.sex = sex;
     }

     public int getAge() {
         return age;
     }

     public void setAge(int age) {
         this.age = age;
     }

     public Map<String, Car> getCars() {
         return cars;
     }

     public void setCars(Map<String, Car> cars) {
         this.cars = cars;
     }

     @Override
     public String toString() {
         return "Person{" +
                 "name='" + name + '\'' +
                 ", sex='" + sex + '\'' +
                 ", age=" + age +
                 ", cars=" + cars +
                 '}';
     }
 }

控制台输出：

Person{name='华崽儿', sex='女', age=28, cars={Lamborghini=Car{brand='Lamborghini', price=2.7E7, maxSpeed=300}, Rolls-Royce=Car{brand='Rolls-Royce', price=2.45E7, maxSpeed=310}, Ferrari=Car{brand='Ferrari', price=2.25E7, maxSpeed=330}}}

<props>标签

 <?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="dataSource" class="com.itdjx.spring.dependency.injection.DataSource">
         <property name="properties" >
             <props>
                 <prop key="user">root</prop>
                 <prop key="possword">123456</prop>
                 <prop key="jdbcUrl">jdbc:mysql:///test</prop>
                 <prop key="driverClass">com.mysql.jdbc.Driver</prop>
             </props>
         </property>
     </bean>

 </beans>

 package com.itdjx.spring.dependency.injection;

 import java.util.Properties;

 /**
  * @author Wáng Chéng Dá
  * @create 2017-03-01 10:21
  */
 public class DataSource {

     private Properties properties;

     public Properties getProperties() {
         return properties;
     }

     public void setProperties(Properties properties) {
         this.properties = properties;
     }

     @Override
     public String toString() {
         return "DataSource{" +
                 "properties=" + properties +
                 '}';
     }
 }

 package com.itdjx.spring.dependency.injection;

 import org.springframework.context.ApplicationContext;
 import org.springframework.context.support.ClassPathXmlApplicationContext;

 /**
  * 依赖注入main
  *
  * @author Wáng Chéng Dá
  * @create 2017-02-28 15:16
  */
 public class MainIOC {

     public static void main(String[] args) {

         ApplicationContext app = new ClassPathXmlApplicationContext("applicationConfig.xml");
         DataSource dataSource = (DataSource) app.getBean("dataSource");
         System.out.println(dataSource);

     }
 }

控制台输出：

DataSource{properties={driverClass=com.mysql.jdbc.Driver, user=root, jdbcUrl=jdbc:mysql:///test, possword=123456}}