Spring 静态工厂实例

直接上代码，看注释。

创建实体类：

package com.spring.classs;

public class Test {
   private String name;
   private String age;


   public Test(String name, String age) {
       this.name = name;
       this.age = age;
   }
   public void setName(String name) {
       this.name = name;
   }
   public void setAge(String age) {
       this.age = age;
   }

   public void hellod(){
       System.out.println("hello:"+name+"年龄"+age);
   }
   @Override
   public String toString() {
       return "Test [name=" + name + ", age=" + age + "]";
   }

}

创建静态的工厂类

package com.spring.beansfactory;

import java.util.HashMap;
import java.util.Map;

import com.spring.classs.Test;

/**
*
* @author 周永发
*静态工厂方法：直接调用某一个类的静态方法就可以返回Bean 的实例
*/
public class StaticCarFactory {
   private static Map<String,Test> testMap = new HashMap<String,Test>();
   static{
       testMap.put("aud1", new Test("test1","32"));
       testMap.put("aud2", new Test("test2","15"));
   }
   //静态工厂方法
   public static Test getCar(String name){
       return testMap.get(name);
   }
}

在Spring的配置文件中配置

<?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
   http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
   http://www.springframework.org/schema/context
   http://www.springframework.org/schema/context/spring-context-3.0.xsd">



   
   <bean id="test1" class="com.spring.beansfactory.StaticCarFactory" factory-method="getCar">
   <constructor-arg value="aud1"></constructor-arg>
   </bean>

</beans>

在Main方法中调用

package com.spring.test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.spring.classs.Test;

public class Spring1 {
   public static void main(String[] args){
       //1.创建Spring的IOC容器对象
       //ApplicationContext 代表IOC容器，且必须要在创建BEAN实例之前
       ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext-Spring.xml");
       //2.从IOC容器中获取BEAN
       Test test =(Test)ctx.getBean("test1");
       //3.调用方法
       test.hellod();
       System.out.println(test);
   }

}

核心思想是在静态工厂中的对象不用实例化！

周永发