spring - 静态工厂

常规用法，没什么好说的，一看就懂

注解和Xml配置混用

public class BeanFactory {
    public Object getInstance(int a) throws Exception {
        if(a==1){
            return new HelloWorld1();
        }else{
            return new HelloWorld2();
        }
    }
}

public class HelloWorld1 {
    public  HelloWorld1(){
        System.out.println("new instance: HelloWorld1");
    }
    public void sayHello(){
        System.out.println("hello");
    }
}

public class HelloWorld2 {
    public  HelloWorld2(){
        System.out.println("new instance: HelloWorld2");
    }
    public void sayHello(){
        System.out.println("hello");
    }
}

 

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
public class TestBean {
    @Autowired
    HelloWorld1 helloWorld1;

    @Autowired
    HelloWorld2 helloWorld2;

    public HelloWorld1 getHelloWorld1() {
        return helloWorld1;
    }

    public HelloWorld2 getHelloWorld2() {
        return helloWorld2;
    }
}

Xml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"
    xmlns:cache="http://www.springframework.org/schema/cache"
    xsi:schemaLocation="
     http://www.springframework.org/schema/beans
     http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
     http://www.springframework.org/schema/context
     http://www.springframework.org/schema/context/spring-context-4.2.xsd
     http://www.springframework.org/schema/cache 
     http://www.springframework.org/schema/cache/spring-cache.xsd">

    <bean id="beanFactory" class="com.client.bean.BeanFactory"/>
        
    <bean id="helloWorld1" factory-bean="beanFactory" factory-method="getInstance">
        <constructor-arg type="int"><value>1</value></constructor-arg>           
    </bean>

    <bean id="helloWorld2" factory-bean="beanFactory" factory-method="getInstance">
        <constructor-arg type="int"><value>2</value></constructor-arg>           
    </bean>
        
    <context:component-scan base-package="com.client.bean" />
</beans>