<bean id="address" class="com.wul.spring.beans.autowire.Address" p:city="Beijing" p:street="HuiLongGuan"> </bean> <bean id="car" class="com.wul.spring.beans.autowire.Car" p:brand="car" p:price="300000"> </bean> <!-- 1.可以使用autowire属性指定自动装配方式，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 , 2.若有匹配的则进行自动装配，若没有匹配的，则不装配,值为null，不会出错. 3.上面的address和carid名必须和Person类中的属性名相同 --> <bean id="person" class="com.wul.spring.beans.autowire.Person" p:name="wul" autowire="byName"></bean>
<!-- 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1个以上的类型匹配的bean， 即其下假设还有一个Address类型的bean的话，其将无法分辨， 会出错 <bean id="address2" class="com.wul.spring.beans.autowire.Address" p:city="Beijing" p:street="HuiLongGuan"> </bean> --> <bean id="person2" class="com.wul.spring.beans.autowire.Person" p:name="wul2" autowire="byType"></bean>3.construction（通过构造器自动装配）：当Bean中存在多个构造器时，此种自动装配方式将会很复杂，不推荐使用
<bean id="address" class="com.wul.spring.beans.autowire.Address" p:city="Beijiang^" p:street="WuDaoKou"> </bean> <!-- bean配置的继承：使用bean的parent属性指定继承哪个bean的配置 --> <bean id="address2" parent="address"></bean>
<bean id="address" class="com.wul.spring.beans.autowire.Address" p:city="Beijiang^" p:street="WuDaoKou"> </bean> <!-- bean配置的继承：使用bean的parent属性指定继承哪个bean的配置 --> <bean id="address2" p:city="Beijing" p:street="DaZhongSi" parent="address"></bean>address2里对应的bean中city和street属性会覆盖父类bean中的属性为Beijing和DaZhongSi。
<!-- 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，只能用来被继承配置, 若某一个bean的class属性没有指定，则该bean必须是一个抽象bean --> <bean id="address" class="com.wul.spring.beans.autowire.Address" p:city="Beijiang^" p:street="WuDaoKou" abstract="true"> </bean> <bean id="address2" parent="address"></bean>
<bean id="address" p:city="Beijiang^" p:street="WuDaoKou" abstract="true"> </bean> <bean id="address2" class="com.wul.spring.beans.relations.Address2" parent="address"></bean>
<!-- 要求在配置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="car" class="com.wul.spring.beans.autowire.Car" p:brand="Audi" p:price="300000"></bean> <bean id="addressdepend" class="com.wul.spring.beans.autowire.Address" p:city="shanghai" p:street="nanjinglu"></bean> <bean id="person" class="com.wul.spring.beans.autowire.Person" p:name="wul" p:address-ref="addressdepend" depends-on="car"></bean> </beans>
<bean id="person" class="com.wul.spring.beans.autowire.Person" p:name="wul" p:address-ref="addressdepend" p:car-ref="car" depends-on="car"></bean>
package com.wul.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 + "]";
}
}package com.wul.spring.beans.autowire;
public class Car {
private String brand;
private double price;
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;
}
@Override
public String toString() {
return "Car [brand=" + brand + ", price=" + price + "]";
}
}
package com.wul.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
+ "]";
}
}
<?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="address" class="com.wul.spring.beans.autowire.Address" p:city="Beijing" p:street="HuiLongGuan"> </bean> <bean id="car" class="com.wul.spring.beans.autowire.Car" p:brand="car" p:price="300000"> </bean> <!-- <bean id="person" class="com.wul.spring.beans.autowire.Person" p:name="wul" p:address-ref="address" p:car-ref="car"></bean> --> <!-- 可以使用autowire属性指定自动装配方式，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,值为null，不会出错. 上面的address和carid名必须和Person类中的属性名相同--> <bean id="person" class="com.wul.spring.beans.autowire.Person" p:name="wul" autowire="byName"></bean> <!-- 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1个以上的类型匹配的bean， 即其下假设还有一个Address类型的bean的话，其将无法分辨， 会出错 <bean id="address2" class="com.wul.spring.beans.autowire.Address" p:city="Beijing" p:street="HuiLongGuan"> </bean> --> <bean id="person2" class="com.wul.spring.beans.autowire.Person" p:name="wul2" autowire="byType"></bean> </beans>
package com.wul.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("applicationContext.xml");
Person person = (Person) ctx.getBean("person");
System.out.println(person);
Person person2 = (Person) ctx.getBean("person2");
System.out.println(person2);
}
}
<?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"
xmlns:util="http://www.springframework.org/schema/util"
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="address" class="com.wul.spring.beans.autowire.Address"
p:city="Beijiang^" p:street="WuDaoKou">
</bean>
bean配置的继承：使用bean的parent属性指定继承哪个bean的配置
<bean id="address2" p:city="Beijing" p:street="DaZhongSi" parent="address"></bean>
-->
<!-- 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，只能用来被继承配置,
若某一个bean的class属性没有指定，则该bean必须是一个抽象bean
<bean id="address" class="com.wul.spring.beans.autowire.Address"
p:city="Beijiang^" p:street="WuDaoKou" abstract="true">
</bean>
<bean id="address2" parent="address"></bean>
-->
<!-- 也可以忽略父Bean的class属性，让子Bean指定自己的类，而共享相同的属性配置，但此时abstract必须为true -->
<bean id="address"
p:city="Beijiang^" p:street="WuDaoKou" abstract="true">
</bean>
<bean id="address2" class="com.wul.spring.beans.relations.Address2"
parent="address"></bean>
<!-- 要求在配置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="car" class="com.wul.spring.beans.autowire.Car"
p:brand="Audi" p:price="300000"></bean>
<bean id="addressdepend" class="com.wul.spring.beans.autowire.Address"
p:city="shanghai" p:street="nanjinglu"></bean>
<!-- <bean id="person" class="com.wul.spring.beans.autowire.Person"
p:name="wul" p:address-ref="addressdepend" depends-on="car"></bean> -->
<bean id="person" class="com.wul.spring.beans.autowire.Person"
p:name="wul" p:address-ref="addressdepend" p:car-ref="car" depends-on="car"></bean>
</beans>
package com.wul.spring.beans.relations;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.wul.spring.beans.autowire.Address;
import com.wul.spring.beans.autowire.Car;
import com.wul.spring.beans.autowire.Person;
public class MainRelations {
public static void main(String[] args) {
ApplicationContext ctx = new ClassPathXmlApplicationContext("beans-relation.xml");
// Address address = (Address) ctx.getBean("address");
// System.out.println(address);
// Address address2 = (Address) ctx.getBean("address2");
// System.out.println(address2);
Address2 address3 = (Address2) ctx.getBean("address2");
System.out.println(address3);
Person person = (Person) ctx.getBean("person");
System.out.println(person);
}
}
原文：http://blog.csdn.net/mrwuyi/article/details/51576603