spring的静态工厂和实例工厂方法

直接上代码吧，好理解

package com.norelax.www.factory;

/**
* 新闻实体类
*
* @author wusong
* @create 2017-05-29 上午10:29
**/
public class News {
String title;
String content;

public News(String title, String content) {
this.title = title;
this.content = content;
}

public String getTitle() {
return title;
}

public void setTitle(String title) {
this.title = title;
}

public String getContent() {
return content;
}

public void setContent(String content) {
this.content = content;
}

@Override
public String toString() {
return "News{" +
"title='" + title + '\'' +
", content='" + content + '\'' +
'}';
}
}
静态工厂方法实体类：
package com.norelax.www.factory;

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

/**
* 静态工厂
*
* @author wusong
* @create 2017-05-29 上午10:30
**/
public class StaticFactory {
private static Map<String, News> newsMap = new HashMap<String, News>();
static{
newsMap.put("news1", new News("标题1", "内容1"));
newsMap.put("news2", new News("标题2", "内容2"));
}

public static News getNews(String name){
return newsMap.get(name);
}
}
实例工厂：

package com.norelax.www.factory;

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

/**
* 实例工厂方法
*
* @author wusong
* @create 2017-05-29 上午10:51
**/
public class InstanceFactory {
Map<String,News> newsMap=new HashMap<String, News>();

public InstanceFactory() {
newsMap.put("news1",new News("标题1","内容1"));
newsMap.put("news2",new News("标题2","内容2"));
}

public News getNews(String name){
return newsMap.get(name);
}
}


静态工厂和实例工厂方法配置：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<!--静态工厂方法 工厂不需要实例化-->
<bean id="news1" class="com.norelax.www.factory.StaticFactory" factory-method="getNews">
<constructor-arg value="news1"/>
</bean>

<!--实例工厂方法是先将工厂实例化-->
<bean id="instanceFactory" class="com.norelax.www.factory.InstanceFactory"/>

<bean id="news2" factory-bean="instanceFactory" factory-method="getNews">
<constructor-arg value="news2"/>
</bean>

</beans>

测试类：
package com.norelax.www.factory;

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

/**
* 测试方法
*
* @author wusong
* @create 2017-05-29 上午10:39
**/
public class FactoryTest {
public static void main(String[] args) {
ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring-factory.xml");
News news1 = (News) applicationContext.getBean("news1");
System.out.println(news1);

News news2 = (News) applicationContext.getBean("news2");
System.out.println(news2);

}

}


测试结果：
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@69d0a921: startup date [Mon May 29 11:01:30 CST 2017]; root of context hierarchy
五月 29, 2017 11:01:30 上午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [spring-factory.xml]
News{title='标题1', content='内容1'}
News{title='标题2', content='内容2'}

Process finished with exit code 0