Spring实战——byType规则

痛定思痛。 2021-07-25 02:54 296阅读 0赞

**一 配置**

<?xml version="1.0" encoding="GBK"?>
    <beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://www.springframework.org/schema/beans"
         xsi:schemaLocation="http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans-4.0.xsd">
         
         <bean id="chinese"  class="org.crazyit.app.service.impl.Chinese"
               autowire="byType"/>
         <bean id="gunDog"  class="org.crazyit.app.service.impl.GunDog">
               <property name="name" value="wangwang"/>
         </bean>
         
         <bean id="petDog"  class="org.crazyit.app.service.impl.PetDog"
               autowire-candidate="false">
               <property name="name" value="ohoh"/>
         </bean>
    </beans>

**二 接口**

Dog

package org.crazyit.app.service;
    
    public interface Dog
    {
         public String run();
    }

Person

package org.crazyit.app.service;
    
    public interface Person
    {
         public void test();
    }

**三 实现类**

Chinese

package org.crazyit.app.service.impl;
    import org.crazyit.app.service.*;
    
    public class Chinese implements Person
    {
         private Dog dog;
         // dog的setter方法
         public void setGunDog(Dog dog)
         {
               this.dog = dog;
         }
         public Dog getDog()
         {
               return this.dog;
         }
         public void test()
         {
               System.out.println("我是一个普通人,养了一条狗："
                    + getDog().run());
         }
    }

Gundog

package org.crazyit.app.service.impl;
    import org.crazyit.app.service.*;
    
    public class GunDog implements Dog
    {
         private String name;
         public void setName(String name)
         {
               this.name = name;
         }
         public String getName()
         {
               return name;
         }
         public String run()
         {
               return "我是一只叫" + getName()
                    + "的猎犬，奔跑迅速..." ;
         }
    }

PetDog

package org.crazyit.app.service.impl;
    import org.crazyit.app.service.*;
    
    public class PetDog implements Dog
    {
         private String name;
         public void setName(String name)
         {
               this.name = name;
         }
         public String getName()
         {
               return name;
         }
         public String run()
         {
               return "我是一只叫" + getName()
                    + "的宠物狗，很可爱..." ;
         }
    }

**四 测试类**

package lee;
    
    
    import org.springframework.context.*;
    import org.springframework.context.support.*;
    
    
    import org.crazyit.app.service.*;
    
    public class SpringTest
    {
        public static void main(String[] args)
        {
            // 以类加载路径下的beans.xml作为配置文件，创建Spring容器
            ApplicationContext ctx = new
                ClassPathXmlApplicationContext("beans.xml");
            Person p = ctx.getBean("chinese" , Person.class);
            p.test();
        }
    }

**五 测试结果**

我是一个普通人,养了一条狗：我是一只叫wangwang的猎犬，奔跑迅速...