1.掌握spring的属性注入的方法：
1.1构造方法注入普通值---------<constructor-arg>标签的使用
首先新建一个类
package spring.day1.demo3;
public class car {
private String name;
private double price;
public car(String name, Double price) {
this.name = name;
this.price = price;
}
@Override
public String toString() {
return "car [name=" + name + ", price=" + price + "]";
}
}在编写applicationContext2.xml
<?xml version="1.0" encoding="UTF-8"?>
<!-- =======================引入spring的关于bean的约束 ========================= -->
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:p="http://www.springframework.org/schema/p"
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属性注入=============================== -->
<!-- 构造方法注入 -->
<bean id="car" class="spring.day1.demo3.car">
<constructor-arg name="name" value="宝马"></constructor-arg>
<constructor-arg name="price" value="500000"></constructor-arg>
</bean> </beans>
在编写测试类SpringDemo3
package spring.day1.demo3; import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext; public class springDemo3 { @Test
public void demo1() {
ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext2.xml");
car bean = (car) applicationContext.getBean("car");
System.out.println(bean);
}
}
运行结果如下
1.2set方法注入普通值和对象属性（ref的使用）------<property>标签的使用
新建一个类car2
package spring.day1.demo3;
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 + "]";
}
}新建一个Employee类
package spring.day1.demo3;
public class employee {
private String name;
private car2 car;
public void setName(String name) {
this.name = name;
}
public void setCar(car2 car) {
this.car = car;
}
@Override
public String toString() {
return "Employee [name=" + name + ", car=" + car + "]";
}
}在applicationContext2.xml中加入以下
<!-- set方法对car2注入普通值 -->
<bean id="car2" class="spring.day1.demo3.car2">
<property name="name" value="奔驰"></property>
<property name="price" value="600000"></property>
</bean> <!-- set方法注入对象 -->
<bean id="employee" class="spring.day1.demo3.employee">
<property name="name" value="张三"></property>
<property name="car" ref="car2"></property>
</bean>
在测试类SpringDemo3加入以下
@Test
public void demo2() {
ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext2.xml");
employee bean = (employee) applicationContext.getBean("employee");
System.out.println(bean);
}
运行截图如下
1.3SPEL方式注入普通值和对象值（Spring3.0以后）
SpEL：Spring Expression Language，Spring的表达式语言。
语法格式：#{SPEL}
新建一个类carInfo
package spring.day1.demo3;
public class carInfo {
private String name;
private double price;
public String getName() {
return "小三轮儿";
}
public double getPrice() {
return Math.random()*1000;
}
}修改applicationContext2.xml为如下
<?xml version="1.0" encoding="UTF-8"?>
<!-- =======================引入spring的关于bean的约束 ========================= -->
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:p="http://www.springframework.org/schema/p"
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属性注入=============================== -->
<!-- 构造方法注入 -->
<bean id="car" class="spring.day1.demo3.car">
<constructor-arg name="name" value="宝马"></constructor-arg>
<constructor-arg name="price" value="500000"></constructor-arg>
</bean> <!-- set方法对car2注入普通值 -->
<!-- <bean id="car2" class="spring.day1.demo3.car2">
<property name="name" value="奔驰"></property>
<property name="price" value="600000"></property>
</bean> --> <!-- set方法注入对象 -->
<!-- <bean id="employee" class="spring.day1.demo3.employee">
<property name="name" value="张三"></property>
<property name="car" ref="car2"></property>
</bean> --> <!-- SPEL方式 -->
<bean id="carInfo" class="spring.day1.demo3.carInfo"></bean> <bean id="car2" class="spring.day1.demo3.car2">
<property name="name" value="#{carInfo.name}"></property>
<property name="price" value="#{carInfo.getPrice()}"></property>
</bean> </beans>
在测试类SpringDemo3加入以下
@Test
public void demo3() {
ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext2.xml");
car2 bean = (car2) applicationContext.getBean("car2");
System.out.println(bean);
}
运行截图如下
1.4P名称空间方式注入普通值和对象(Spring2.5以后)了解
2.集合属性注入（了解）
1.新建CollectionBean类
2.在applicationContext2.xml中加入如下代码
3.新建测试类测试
<!-- =======================spring集合属性的注入============================ -->
<bean id="collectionBean" class="zcc.spring.demo5.CollectionBean">
<!-- 数组类型 -->
<property name="arrs">
<list>
<value>张三</value>
<value>李四</value>
<value>王麻子</value>
</list>
</property>
<!-- List集合类型 -->
<property name="list">
<list>
<value>一号</value>
<value>二号</value>
<value>三号</value>
</list>
</property>
<!-- Set集合类型 -->
<property name="set">
<set>
<value>a</value>
<value>b</value>
<value>c</value>
</set>
</property>
<!-- Map集合类型 -->
<property name="map">
<map>
<entry key="数字" value="1"></entry>
<entry key="性别" value="男"></entry>
</map>
</property>
</bean>
package zcc.spring.demo5; import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Set; /*
* 集合属性的注入
*/
public class CollectionBean {
private String []arrs;
private List<String> list;
private Set<String> set;
private Map<String,String> map;
public void setArrs(String[] arrs) {
this.arrs = arrs;
}
public void setList(List<String> list) {
this.list = list;
}
public void setSet(Set<String> set) {
this.set = set;
}
public void setMap(Map<String, String> map) {
this.map = map;
}
@Override
public String toString() {
return "CollectionBean [arrs=" + Arrays.toString(arrs) + ", list=" + list + ", set=" + set + ", map=" + map
+ "]";
} }
package zcc.spring.demo5; import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext; /*
* 集合类型的属性注入
*/
public class SpringDemo5 { @Test
public void demo1() {
//创建spring的工厂来实例化xml中所有的bean对象
ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
CollectionBean bean = (CollectionBean) applicationContext.getBean("collectionBean");
System.out.println(bean);
} }