03-spring学习-自动装配

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>

 

posted @ 2017-11-23 00:19  美好的明天  阅读(297)  评论(0编辑  收藏  举报