自动装配
新建person类:
package com.spring.bean.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 + "]";
} }
新建Car类:
package com.spring.bean.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 + "]";
}
}
Address类:
package com.spring.bean.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 + "]";
}
}
配置文件:
<bean id="address" class="com.spring.bean.autowire.Address"
p:city="北京" p:street="芙蓉观"></bean> <bean id="car" class="com.spring.bean.autowire.Car"
p:brand="奥迪" p:price="3000"></bean> <bean id="person" class="com.spring.bean.autowire.Person"
p:name="汤姆" p:address-ref="address" p:car-ref="car"></bean>
使用:
ApplicationContext ctx=new ClassPathXmlApplicationContext("beans-autowire.xml");
Person person=(Person) ctx.getBean("person");
System.out.print(person);
运行:
改成自动装配:
byName:可以使用autowire属性自动装配的方式,byName根据bean的名字和当前bean的setter风格的属性名自动装配。
<bean id="address" class="com.spring.bean.autowire.Address"
p:city="北京" p:street="芙蓉观"></bean> <bean id="car" class="com.spring.bean.autowire.Car"
p:brand="奥迪" p:price="3000"></bean> <!-- 可以使用autowire属性自动装配的方式,byName根据bean的名字和当前bean的setter风格的属性名自动装配 ,
若有匹配的,则进行自动装配,若没有匹配的不装配-->
<bean id="person" class="com.spring.bean.autowire.Person"
p:name="汤姆" autowire="byName"></bean>
byType:
可以使用autowire属性自动装配的方式,byName根据bean的类型和当前bean的setter风格的类型进行自动装配 ,
但是,如果IOC容器中有一个以上的类型匹配的bean,则抛异常。
<!-- 可以使用autowire属性自动装配的方式,byName根据bean的类型和当前bean的setter风格的类型进行自动装配 ,
但是,如果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.spring.bean.autowire.Person"
p:name="汤姆" autowire="byType"></bean>