Case study of spring framework setting injection operation

This article describes the spring framework set value injection operation with an example. Share with you for your reference, as follows:

One configuration

<?xml version="1.0" encoding="GBK"?>
<!-- Spring配置文件的根元素，使用spring-beans-4.0.xsd语义约束 -->
<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">
   <!-- 配置chinese实例，其实现类是Chinese类 -->
   <bean id="chinese" class="org.crazyit.app.service.impl.Chinese">
      <!-- 驱动调用chinese的setAxe()方法，将容器中stoneAxe作为传入参数 -->
      <property name="axe" ref="stoneAxe"/>
   </bean>
   <!-- 配置stoneAxe实例，其实现类是StoneAxe -->
   <bean id="stoneAxe" class="org.crazyit.app.service.impl.StoneAxe"/>
   <!-- 配置steelAxe实例，其实现类是SteelAxe -->
   <bean id="steelAxe" class="org.crazyit.app.service.impl.SteelAxe"/>
</beans>

Second interface

Axe

package org.crazyit.app.service;
public interface Axe
{
   // Axe接口里有个砍的方法
   public String chop();
}

Person

package org.crazyit.app.service;
public interface Person
{
   // 定义一个使用斧子的方法
   public void useAxe();
}

Three realization

Chinese

package org.crazyit.app.service.impl;
import org.crazyit.app.service.*;
public class Chinese implements Person
{
   private Axe axe;
   // 设值注入所需的setter方法
   public void setAxe(Axe axe)
   {
      this.axe = axe;
   }
   // 实现Person接口的useAxe方法
   public void useAxe()
   {
      // 调用axe的chop()方法，
      // 表明Person对象依赖于axe对象
      System.out.println(axe.chop());
   }
}

StoneAxe

package org.crazyit.app.service.impl;
import org.crazyit.app.service.*;
public class StoneAxe implements Axe
{
   public String chop()
   {
      return "石斧砍柴好慢";
   }
}

SteelAxe

package org.crazyit.app.service.impl;
import org.crazyit.app.service.*;
public class SteelAxe implements Axe
{
   public String chop()
   {
      return "钢斧砍柴真快";
   }
}

Four test categories

package lee;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.crazyit.app.service.*;
public class BeanTest
{
  public static void main(String[] args)throws Exception
  {
    // 创建spring容器
    ApplicationContext ctx = new
      ClassPathXmlApplicationContext("beans.xml");
    // 获取chinese 实例
    Person p = ctx.getBean("chinese",Person.class);
    // 调用useAxe()方法
    p.useAxe();
  }
}

V. operation

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