Spring的属性注入
给Bean当中的属性设置值:
一、普通类型的注入
1、构造方法的方式的属性注入
<?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">
<!-- Spring的属性注入的方式 -->
<!-- 构造方法的方式 -->
<bean id="car" class="com.itzheng.spring.demo4.Car">
<constructor-arg name="name" value="宝马"/>
<constructor-arg name="price" value="800000"/>
</bean>
</beans>
package com.itzheng.spring.demo4;
public class Car {
private String name;
private Double price;
public Car(String name, Double price) {
super();
this.name = name;
this.price = price;
}
@Override
public String toString() {
return "Car [name=" + name + ", price=" + price + "]";
}
}
package com.itzheng.spring.demo4;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/*
* 属性注入的方式
*/
public class SpringDemo4 {
@Test
public void demo1() {
// 创建工程
ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
// 获得到对应XML当中的对象
Car car = (Car) applicationContext.getBean("car");
System.out.println(car);
}
}
2、Set方法的方式的属性注入
<?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">
<!-- Spring的属性注入的方式 -->
<!-- 构造方法的方式 -->
<!-- set方法方式符注入 -->
<bean id="car2" class="com.itzheng.spring.demo4.Car2">
<property name="name" value="奔驰"></property>
<property name="price" value="1000000"></property>
</bean>
</beans>
package com.itzheng.spring.demo4;
/*
* set方法的属性注入
*/
public class Car2 {
private String name;
private Double price;
public void setName(String name) {
this.name = name;
}
public void setPrice(Double price) {
this.price = price;
}
@Override
public String toString() {
return "Car2 [name=" + name + ", price=" + price + "]";
}
}
/*
set方法注入
*/
@Test
public void demo2() {
// 创建工程
ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
// 获得到对应XML当中的对象
Car2 car2 = (Car2) applicationContext.getBean("car2");
System.out.println(car2);
}
二、对象类型注入
1、set方法来注入对象
创建类和对应的set方法
package com.itzheng.spring.demo4;
public class Employee {
private String name;
private Car2 car2;
public void setName(String name) {
this.name = name;
}
public void setCar2(Car2 car2) {
this.car2 = car2;
}
@Override
public String toString() {
return "Employee [name=" + name + ", car2=" + car2 + "]";
}
}
设置XML属性配置
<?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">
<!-- Spring的属性注入的方式 -->
<!-- 构造方法的方式 -->
<bean id="car" class="com.itzheng.spring.demo4.Car">
<constructor-arg name="name" value="宝马"/>
<constructor-arg name="price" value="800000"/>
</bean>
<!-- set方法方式符注入 -->
<bean id="car2" class="com.itzheng.spring.demo4.Car2">
<property name="name" value="奔驰"></property>
<property name="price" value="1000000"></property>
</bean>
<!-- set方法去注入对象类型的属性 -->
<bean id="employee" class="com.itzheng.spring.demo4.Employee">
<!-- value是用来设置普通类型的值。ref是用来设置其他类的id 或者name -->
<property name="name" value="张三"/>
<property name="car2" ref="car2"/>
</bean>
</beans>
value是用来设置普通类型的值。
ref是用来设置其他类的id 或者name ref是另外一个普通类型
2、构造方法来注入对象
创建类和对应的构造方法
package com.itzheng.spring.demo4;
public class Boos {
private String name;
private Car car;
public Boos(String name, Car car) {
super();
this.name = name;
this.car = car;
}
@Override
public String toString() {
return "Boos [name=" + name + ", car=" + car + "]";
}
}
<?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">
<!-- Spring的属性注入的方式 -->
<!-- 构造方法的方式 -->
<bean id="car" class="com.itzheng.spring.demo4.Car">
<constructor-arg name="name" value="宝马"/>
<constructor-arg name="price" value="800000"/>
</bean>
<bean id="boos" class="com.itzheng.spring.demo4.Boos">
<constructor-arg name="name" value="李四"/>
<constructor-arg name="car" ref="car"/>
</bean>
</beans>
ref设置对应的类
@Test
public void demo3() {
// 创建工程
ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
// 获得到对应XML当中的对象
Boos boos = (Boos) applicationContext.getBean("boos");
System.out.println(boos);
}