1.自动装配
beans-autowire.xml
<?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"
xmlns:p="http://www.springframework.org/schema/p"
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-4.0.xsd"> <bean id="address2" class="com.aff.spring.beans.autowire.Address" p:city="hefei" p:street="wanda"></bean>
<bean id="address" class="com.aff.spring.beans.autowire.Address" p:city="wuhu" p:street="wanda"></bean>
<bean id="car" class="com.aff.spring.beans.autowire.Car" p:brand="audi" p:price="250000"></bean>
<!-- 可以使用autowire 属性指定自动装配的方式
byName 根据bean 的名字和当前 bean 的setter 风格的属性名进行自动装配，若有匹配的， 则进行自动装配，
若没有匹配的， 则不装配
byType 根据 bean的类型 和当前bean 的属性的类型进行自动装配，
若IOC容器中有一个以上的类型匹配的bean， 则抛异常
-->
<bean id="person" class="com.aff.spring.beans.autowire.Person" p:name="Hxl" autowire="byName"></bean>
</beans>
Main.java
package com.aff.spring.beans.autowire; import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext; public class Main {
public static void main(String[] args) {
ApplicationContext ctx = new ClassPathXmlApplicationContext("beans-autowire.xml");
Person person = (Person) ctx.getBean("person");
System.out.println(person);
//Person [name=Hxl, addres=Address [city=hefei, street=wanda], car=Car [brand=audi, price=250000.0]] }
}
Person.java
package com.aff.spring.beans.autowire;
public class Person {
private String name;
private Address address;
private Car car;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Address getAddress() {
return address;
}
public void setAddress(Address address) {
this.address = address;
}
public Car getCar() {
return car;
}
public void setCar(Car car) {
this.car = car;
}
@Override
public String toString() {
return "Person [name=" + name + ", address=" + address + ", car=" + car + "]";
}
}
Address.java
package com.aff.spring.beans.autowire;
public class Address {
private String city;
private String street;
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public String getStreet() {
return street;
}
public void setStreet(String street) {
this.street = street;
}
@Override
public String toString() {
return "Address [city=" + city + ", street=" + street + "]";
}
public Address() {
super();
}
public Address(String city, String street) {
super();
this.city = city;
this.street = street;
}
}
Car.java
package com.aff.spring.beans.autowire;
public class Address {
private String city;
private String street;
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public String getStreet() {
return street;
}
public void setStreet(String street) {
this.street = street;
}
@Override
public String toString() {
return "Address [city=" + city + ", street=" + street + "]";
}
public Address() {
super();
}
public Address(String city, String street) {
super();
this.city = city;
this.street = street;
}
}
2.bean之间的关系：继承；依赖
beans-relation.xml
<?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:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- 抽象bean： bean 的abstract 属性为true 的bean ，
这样的bean 不能被IOC 容器实例化，只用来被继承配置 -->
<!--若一个bean的 class 属性都没有指定，则该bean 必须为一个抽象bean-->
<bean id="address" p:city="hefei" p:street="wanda" abstract="true"></bean> <!-- bean 配置的继承 ： 使用 bean 的parent 属性 指定继承 那个bean的配置 -->
<bean id="address2" class="com.aff.spring.beans.autowire.Address" p:street="buxinjie" parent="address"></bean> <bean id="car" class="com.aff.spring.beans.autowire.Car" p:brand="audi" p:price="260000"></bean> <!-- 要求再配置 Person 时 ， 必须有一个关联的Car 换句话说， Person 这个bean 依赖于Car这个bean-->
<bean id="person" class="com.aff.spring.beans.autowire.Person" p:name="Tom" p:address-ref="address2" depends-on="car"></bean>
</beans>
Main
package com.aff.spring.beans.relation; import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext; import com.aff.spring.beans.autowire.Address;
import com.aff.spring.beans.autowire.Person; public class Main {
public static void main(String[] args) {
ApplicationContext ctx = new ClassPathXmlApplicationContext("beans-relation.xml");
// Address address = (Address) ctx.getBean("address");
// System.out.println(address);
// Address [city=hefei, street=wanda] Address address2 = (Address) ctx.getBean("address2");
System.out.println(address2);
// Address [city=hefei, street=buxinjie] Person person = (Person) ctx.getBean("person");
System.out.println(person);
//Person [name=Tom, address=Address [city=hefei, street=buxinjie], car=null] }
}
3.bean 的作用域：singleton；prototype；
beans-scope.xml
<?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:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> <!-- 使用bean 的scope 属性来配置 bean 的作用域
singleton 默认的，容器初始化时创建bean实例， 在整个生命周期内只创建一个bean， 单例的
prototype : 原型的，容器初始化 不创建bean的实例，而在每次请求时都创建一个新的bean 实例，并返回
-->
<bean id="car" class="com.aff.spring.beans.autowire.Car" scope="singleton">
<property name="brand" value="audi"></property>
<property name="price" value="250000"></property>
</bean> </beans>
Main
package com.aff.spring.beans.scope;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext; import com.aff.spring.beans.autowire.Car; public class Main {
public static void main(String[] args) {
ApplicationContext ctx = new ClassPathXmlApplicationContext("beans-scope.xml"); Car car = (Car) ctx.getBean("car");
Car car2 = (Car) ctx.getBean("car");
System.out.println(car==car2);
//true
}
}
目录
