Spring IOC 容器可以自动装配Bean,需要做的是在<bean>的autowire属性里指定自动装配的模式
1）byType 根据类型自动装配，若IOC 容器中有多个目标Bean类型一致的Bean,Spring将无法判定哪个Bean最适合该属性，不能执行自动装配
2）byName 根据名称自动装配，必须将目标Bean名称和属性名设置的完全相同
配置方法：
Address.java
package com.spring.autowire;
public class Address {
private String city;
private String location;
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public String getLocation() {
return location;
}
public void setLocation(String location) {
this.location = location;
}
@Override
public String toString() {
return "Address [city=" + city + ", location=" + location + "]";
}
}
2、Car.java
package com.spring.autowire;
public class Car {
private String brand;
private String price;
public String getBrand() {
return brand;
}
public void setBrand(String brand) {
this.brand = brand;
}
public String getPrice() {
return price;
}
public void setPrice(String price) {
this.price = price;
}
@Override
public String toString() {
return "Car [brand=" + brand + ", price=" + price + "]";
}
}
3、Person.java
package com.spring.autowire;
public class Person {
private String name;
private String age;
private Address address;
@Override
public String toString() {
return "Person [address=" + address + ", age=" + age + ", car=" + car
+ ", name=" + name + "]";
}
private Car car;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
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;
}
}
4、配置文件bean-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:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> <bean id="car" class="com.spring.autowire.Car">
<property name="brand" value="Audi"></property>
<property name="price" value="300000"></property>
</bean> <bean id="address" class="com.spring.autowire.Address">
<property name="city" value="beijing"></property>
<property name="location" value="fangshan"></property>
</bean> <bean id="person" class="com.spring.autowire.Person" autowire="byName">
</bean>
</beans>
5、测试
package com.spring.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("bean-autowire.xml");
Person person = (Person)ctx.getBean("person");
System.out.println(person);
}
}
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
byType根据bean的类型和当前bean的属性类型进行自动装配，若 IOC 容器中有1个以上的类型的bean,则抛出异常