自动装配Bean

环境搭建

public class person {
    private Dog dog;
    private Cat cat;
    private String name;
 
    public Dog getDog() {
        return dog;
    }
 
    public void setDog(Dog dog) {
        this.dog = dog;
    }
 
    public Cat getCat() {
        return cat;
    }
 
    public void setCat(Cat cat) {
        this.cat = cat;
    }
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    @Override
    public String toString() {
        return "person{" +
                "dog=" + dog +
                ", cat=" + cat +
                ", name='" + name + '\'' +
                '}';
    }
}

显式装配

<?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:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
    <bean id="cat" class="com.Google.pojo.Cat"/>
    <bean id="dog" class="com.Google.pojo.Dog"/>
    <bean id="person" class="com.Google.pojo.person">
        <property name="cat" ref="cat"/>
        <property name="dog" ref="dog"/>
        <property name="name" value="Spring"/>
    </bean>
</beans>
 

这里person类的属性，都有对应的值。全都显式的配置好了

ByName自动装配

ByName：在Spring上下文中，person类的set方法后面的属性要与Bean id相同，才能自动装配

 
    <bean id="cat" class="com.Google.pojo.Cat"/>
    <bean id="dog" class="com.Google.pojo.Dog"/>
    <!--ByName：在Spring上下文中，person类的set方法后面的属性要与Bean id相同，才能自动装配-->
    <bean id="person" class="com.Google.pojo.person" autowire="byName">
        <property name="name" value="Spring"/>
    </bean>

ByType自动装配

ByType：在Spring上下文中，person类的属性的类型与Bean class一致，才能实现自动装配。适用于全局类型唯一的环境

<bean id="cat" class="com.Google.pojo.Cat"/>
    <bean id="dog" class="com.Google.pojo.Dog"/>
    <!--ByType：在Spring上下文中，person类的属性的类型与Bean class一致，才能实现自动装配-->
    <bean id="person" class="com.Google.pojo.person" autowire="byType">
        <property name="name" value="Spring"/>
    </bean>