1.自动装配

beans-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: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="address2" class="com.aff.spring.beans.autowire.Address" p:city="hefei"  p:street="wanda"></bean>

<bean id="address" class="com.aff.spring.beans.autowire.Address" p:city="wuhu"  p:street="wanda"></bean>

<bean id="car" class="com.aff.spring.beans.autowire.Car" p:brand="audi" p:price="250000"></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，若有匹配的， 则进行自动装配，
               若没有匹配的， 则不装配

        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容器中有一个以上的类型匹配的bean， 则抛异常

 -->

<bean id="person" class="com.aff.spring.beans.autowire.Person"   p:name="Hxl" autowire="byName"></bean>

</beans>

Main.java

package com.aff.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("beans-autowire.xml");

     Person person = (Person) ctx.getBean("person");

     System.out.println(person);

     //Person [name=Hxl, addres=Address [city=hefei, street=wanda], car=Car [brand=audi, price=250000.0]]

}

}

Person.java

package com.aff.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 + "]";

    }

}

Address.java

package com.aff.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 Address() {

        super();

    }

    public Address(String city, String street) {

        super();

        this.city = city;

        this.street = street;

    }

}

Car.java

package com.aff.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 Address() {

        super();

    }

    public Address(String city, String street) {

        super();

        this.city = city;

        this.street = street;

    }

}

2.bean之间的关系：继承；依赖

beans-relation.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.xsd">

    <!-- 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，只用来被继承配置 -->

    <!--若一个bean的 class  属性都没有指定，则该bean 必须为一个抽象bean-->

    <bean id="address" p:city="hefei" p:street="wanda" abstract="true"></bean>

    <!-- bean 配置的继承 ： 使用 bean 的parent 属性 指定继承 那个bean的配置 -->

    <bean id="address2" class="com.aff.spring.beans.autowire.Address"  p:street="buxinjie" parent="address"></bean>

    <bean id="car" class="com.aff.spring.beans.autowire.Car" p:brand="audi" p:price="260000"></bean>

     <!-- 要求再配置 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="person" class="com.aff.spring.beans.autowire.Person" p:name="Tom" p:address-ref="address2" depends-on="car"></bean>

</beans>

Main

package com.aff.spring.beans.relation;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.aff.spring.beans.autowire.Address;

import com.aff.spring.beans.autowire.Person;

public class Main {

    public static void main(String[] args) {

        ApplicationContext ctx = new ClassPathXmlApplicationContext("beans-relation.xml");

        // Address address = (Address) ctx.getBean("address");

        // System.out.println(address);

        // Address [city=hefei, street=wanda]

        Address address2 = (Address) ctx.getBean("address2");

        System.out.println(address2);

        // Address [city=hefei, street=buxinjie]

        Person person = (Person) ctx.getBean("person");

        System.out.println(person);

        //Person [name=Tom, address=Address [city=hefei, street=buxinjie], car=null]

    }

}

3.bean 的作用域：singleton；prototype；

beans-scope.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.xsd">

    <!-- 使用bean 的scope 属性来配置 bean 的作用域

           singleton 默认的，容器初始化时创建bean实例， 在整个生命周期内只创建一个bean， 单例的

           prototype : 原型的，容器初始化 不创建bean的实例，而在每次请求时都创建一个新的bean 实例，并返回

     -->

    <bean id="car" class="com.aff.spring.beans.autowire.Car" scope="singleton">

    <property name="brand" value="audi"></property>

    <property name="price" value="250000"></property>

    </bean>

</beans>

Main

package com.aff.spring.beans.scope;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.aff.spring.beans.autowire.Car;

public class Main {

    public static void main(String[] args) {

        ApplicationContext ctx = new ClassPathXmlApplicationContext("beans-scope.xml");

        Car car = (Car) ctx.getBean("car");

        Car car2 = (Car) ctx.getBean("car");

        System.out.println(car==car2);

        //true

    }

}

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