Spring 工厂方法配置

java

User.java

package com.spring.factory;

public class User {
	private String name;
	private String address;
	
	public User() {
		System.out.println("create user...");
	}
	public User(String name, String address) {
		super();
		this.name = name;
		this.address = address;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getAddress() {
		return address;
	}
	public void setAddress(String address) {
		this.address = address;
	}
	@Override
	public String toString() {
		return "User [name=" + name + ", address=" + address + "]";
	}
	
	
	
}

UserStaticFactory.java

package com.spring.factory;

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

//静态工厂类
public class UserStaticFactory {

	private static Map<String, User> users = new HashMap<String ,User>();
	
	static{
		users.put("matt", new User("matt","SH"));
		users.put("joy", new User("joy","SH"));
	}
	
	
	public static User getUser(String name){
		
		return users.get(name);
	}
}

 UserInstaceFactory.java

 

package com.spring.factory;

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

//实例工厂类
public class UserInstaceFactory {

	private Map<String,User> users = null;

	public UserInstaceFactory() {
		users = new HashMap<String, User>();
		users.put("matt", new User("matt","SH"));
		users.put("joy", new User("joy","SH"));
	}
	
   public User getUser(String name){
		
		return users.get(name);
	}
	
}

 SpringUserFactory.java

package com.spring.factory;

import org.springframework.beans.factory.FactoryBean;

//继承Spring FactoryBean的实例
public class SpringUserFactory implements FactoryBean<User>{
	private String name;
	
	public void setName(String name) {
		this.name = name;
	}

	//返回bean的对象
	public User getObject() throws Exception {
		
		return new User(name,"SH");
	}

	//返回bean的类型
	public Class<?> getObjectType() {
		return User.class;
	}

	public boolean isSingleton() {
		return true;
	}

}

 Main.java

package com.spring.factory;

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

public class Main {

	public static void main(String[] args) {
		ApplicationContext ext = new ClassPathXmlApplicationContext("factory.xml");
		
		//通过工厂静态方法
		User user = (User) ext.getBean("staticFactory");
		System.out.println(user);
		
		//通过工厂实例方法
		User user1 = (User) ext.getBean("user1");
		System.out.println(user1);
		
		
		//通过spring factorybean
		User user2 = (User) ext.getBean("user2");
		System.out.println(user2);

	}

}

 

xml

<?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">

<!--静态工厂方法配置-->
<bean id="staticFactory" class="com.spring.factory.UserStaticFactory" factory-method="getUser">
 <constructor-arg value="matt"></constructor-arg>
</bean>


<!-- 实例工厂方法配置 -->
<bean id="instaceFactory" class="com.spring.factory.UserInstaceFactory"></bean>
<bean id="user1" factory-bean="instaceFactory" factory-method="getUser">
<constructor-arg value="joy"></constructor-arg>
</bean>

<!-- 通过继承Spring的factory -->
<bean id ="user2" class="com.spring.factory.SpringUserFactory">
<property name="name" value="shire"></property>
</bean>
</beans>