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Spring学习--引用其他Bean , 内部Bean
引用其他Bean：
- 组成应用程序的 Bean 经常需要相互协作以完成应用程序的功能 , 要使 Bean 能够相互访问, 就必须在 Bean 配置文件中指定对 Bean 的引用。
- 在 Bean 的配置文件中 , 可以通过 <ref> 元素或 ref 属性为 Bean 的属性或者构造器参数指定对 Bean 的引用。
- 也可以在属性或者构造器里包含 Bean 的声明 , 这样的 Bean 称为内部 Bean。
1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> 5 6 <bean id="person" class="com.itdjx.spring.dependency.injection.Person"> 7 <property name="name" value="张三"/> 8 <property name="age" value="23"/> 9 <property name="sex" value="男"/> 10 <property name="car" ref="car3"/> 11 </bean> 12 13 <bean id="car3" class="com.itdjx.spring.dependency.injection.Car"> 14 <constructor-arg value="BaoMa" index="0"/> 15 <constructor-arg value="HuaChen" index="1"/> 16 <constructor-arg value="230000" index="2" type="double"/> 17 </bean> 18 19 <bean id="car4" class="com.itdjx.spring.dependency.injection.Car"> 20 <constructor-arg value="BaoMa" index="0"/> 21 <constructor-arg value="HuaChen" index="1"/> 22 <constructor-arg value="230" type="int"/> 23 </bean> 24 25 </beans>
1 package com.itdjx.spring.dependency.injection; 2 3 /** 4 * 属性注入 5 * 6 * @author Wáng Chéng Dá 7 * @create 2017-02-28 15:14 8 */ 9 public class Person { 10 11 private String name; 12 13 private String sex; 14 15 private int age; 16 17 private Car car; 18 19 public String getName() { 20 return name; 21 } 22 23 public void setName(String name) { 24 this.name = name; 25 } 26 27 public String getSex() { 28 return sex; 29 } 30 31 public void setSex(String sex) { 32 this.sex = sex; 33 } 34 35 public int getAge() { 36 return age; 37 } 38 39 public void setAge(int age) { 40 this.age = age; 41 } 42 43 44 public Car getCar() { 45 return car; 46 } 47 48 public void setCar(Car car) { 49 this.car = car; 50 } 51 52 @Override 53 public String toString() { 54 return "Person{" + 55 "name=‘" + name + ‘\‘‘ + 56 ", sex=‘" + sex + ‘\‘‘ + 57 ", age=" + age + 58 ", car=" + car + 59 ‘}‘; 60 } 61 }
1 package com.itdjx.spring.dependency.injection; 2 3 /** 4 * 构造器注入 5 * 6 * @author Wáng Chéng Dá 7 * @create 2017-02-28 15:32 8 */ 9 public class Car { 10 11 private String brand; 12 13 private String address; 14 15 private double price; 16 17 private int maxSpeed; 18 19 20 public Car(String brand, String address, double price) { 21 this.brand = brand; 22 this.address = address; 23 this.price = price; 24 } 25 26 public Car(String brand, String address, int maxSpeed) { 27 this.brand = brand; 28 this.address = address; 29 this.maxSpeed = maxSpeed; 30 } 31 32 public Car(String brand, double price, int maxSpeed) { 33 this.brand = brand; 34 this.price = price; 35 this.maxSpeed = maxSpeed; 36 } 37 38 public Car() { 39 } 40 41 @Override 42 public String toString() { 43 return "Car{" + 44 "brand=‘" + brand + ‘\‘‘ + 45 ", address=‘" + address + ‘\‘‘ + 46 ", price=" + price + 47 ", maxSpeed=" + maxSpeed + 48 ‘}‘; 49 } 50 }
1 package com.itdjx.spring.dependency.injection; 2 3 import org.springframework.context.ApplicationContext; 4 import org.springframework.context.support.ClassPathXmlApplicationContext; 5 6 /** 7 * 依赖注入main 8 * 9 * @author Wáng Chéng Dá 10 * @create 2017-02-28 15:16 11 */ 12 public class MainIOC { 13 14 public static void main(String[] args) { 15 ApplicationContext app = new ClassPathXmlApplicationContext("applicationConfig.xml"); 16 Person person = (Person) app.getBean("person"); 17 System.out.println(person); 18 19 } 20 }
控制台输出：
| Person{name=‘张三‘, sex=‘男‘, age=23, car=Car{brand=‘BaoMa‘, address=‘HuaChen‘, price=230000.0, maxSpeed=0}} |
内部Bean：
1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> 5 6 <bean id="person2" class="com.itdjx.spring.dependency.injection.Person"> 7 <property name="name" value="李玉"/> 8 <property name="age" value="23"/> 9 <property name="sex" value="女"/> 10 <property name="car" > 11 <bean class="com.itdjx.spring.dependency.injection.Car"> 12 <constructor-arg value="Ferrari" index="0"/> 13 <constructor-arg value="Italy" index="1"/> 14 <constructor-arg value="22500000" type="double"/> 15 </bean> 16 </property> 17 </bean> 18 19 </beans>
1 package com.itdjx.spring.dependency.injection; 2 3 import org.springframework.context.ApplicationContext; 4 import org.springframework.context.support.ClassPathXmlApplicationContext; 5 6 /** 7 * 依赖注入main 8 * 9 * @author Wáng Chéng Dá 10 * @create 2017-02-28 15:16 11 */ 12 public class MainIOC { 13 14 public static void main(String[] args) { 15 ApplicationContext app = new ClassPathXmlApplicationContext("applicationConfig.xml"); 16 17 Person person = (Person) app.getBean("person2"); 18 System.out.println(person); 19 20 } 21 }
控制台输出：
| Person{name=‘李玉‘, sex=‘女‘, age=23, car=Car{brand=‘Ferrari‘, address=‘Italy‘, price=2.25E7, maxSpeed=0}} |
Spring学习--引用其他Bean , 内部Bean
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