Spring XML 配置里的bean 的自定装配
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Spring IOC 容器可以自动装配Bean,需要在<Bean> 的autowire 属性里指定自动装配模式
1. byType ( 根据类型自动装配 ):若IOC 容器中有多个与目标Bean 类型一致的Bean,在这种情况下,
Spring将无法判定哪个bean 最适合该属性,所以不能执行自动装配
2. byName ( 根据名称自动装配 ) 必须将目标Bean 的名称和属性名设置的完全相同
3. constructor(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
Xml 配置里的Bean 自动装配的缺点
1. 在Bean配置文件里设置autowire属性进行自动装配将会装配Bean的所有属性,然而,若只希望装配个别属性时
autowire 就不都灵活了
2.autowire 属性要么根据类型自动装配,要么根据名称自动装配,不能两者兼容。
3.一般情况下,在实际的项目中很少使用自动装配功能。因为和自动装配功能所带来的好处比起来,明确清晰的配置
文档更有说服力
package com.zcjy.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 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.zcjy.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 + "]";
}
}
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.zcjy.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
+ "]";
}
}
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: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-3.1.xsd">
<bean id="Address1" class="com.zcjy.spring.beans.autowire.Address"
p:city="上海" p:street="南京路"></bean>
<!-- 这里的car跟 setter 方法里面的car 一样,所以可以装配上 -->
<bean id="car" class="com.zcjy.spring.beans.autowire.Car"
p:brand="BMW" p:price="50"></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
-->
<bean id="Person1" class="com.zcjy.spring.beans.autowire.Person"
p:name="Tom" autowire="byName">
<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-3.1.xsd">
<bean id="Address1" class="com.zcjy.spring.beans.autowire.Address"
p:city="上海" p:street="南京路"></bean>
<!-- 这里的car跟 setter 方法里面的car 一样,所以可以装配上 -->
<bean id="car" class="com.zcjy.spring.beans.autowire.Car"
p:brand="BMW" p:price="50"></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
-->
<bean id="Person1" class="com.zcjy.spring.beans.autowire.Person"
p:name="Tom" autowire="byName">
<!-- 可以把ByName 改成 ByType -->
</bean>
</beans>
</bean>
</beans>
package com.zcjy.spring.beans.autowire;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Test {
public static void main(String[] args) {
ApplicationContext act = new ClassPathXmlApplicationContext("beans-autowire.xml");
Person person1 = (Person)act.getBean("Person1");
System.out.println(person1);
Person person2 = (Person)act.getBean("Person2");
System.out.println(person2);
}
}
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Test {
public static void main(String[] args) {
ApplicationContext act = new ClassPathXmlApplicationContext("beans-autowire.xml");
Person person1 = (Person)act.getBean("Person1");
System.out.println(person1);
Person person2 = (Person)act.getBean("Person2");
System.out.println(person2);
}
}
控制台打印结果 :
Person [name=Tom, address=null, car=Car [brand=BMW, price=50.0]]
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