Spring入门

IMessage.java

package com.umgsai.spring;
public interface IMessage {//定义接口
    public abstract String getMessage();
}

Message.java

package com.umgsai.spring;
public class Message implements IMessage {
    public String getMessage() {
        return "Hello world!";
    }
}

Hello.java

package com.umgsai.spring;
public class Hello implements IMessage{
    public String getMessage() {
        return "你好！";
    }
}

类路径下applicationContext.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-3.0.xsd">
                                
    <bean id="a1" class="com.umgsai.spring.Message"/>
    <bean id="a2" class="com.umgsai.spring.Hello"/>
</beans>

MainClass.java

MainClass.java
package com.umgsai.spring;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class MainClass {
    public static void main(String[] args) {
        //IMessage message = MessageFactory.create("1");
        //创建spring Bean工厂
        BeanFactory factory = new ClassPathXmlApplicationContext("applicationContext.xml");
        //BeanFactory factory = new ClassPathXmlApplicationContext("app*.xml");通配符
        IMessage message = (IMessage)factory.getBean("a1");
        System.out.println(message.getMessage());
        message = (IMessage)factory.getBean("a2");    
        System.out.println(message.getMessage());
    }
}

运行，控制台输出结果

Hello world!

你好！

applicationContext.xml模板

<?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:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx"
    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/tx
  http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
  http://www.springframework.org/schema/context
  http://www.springframework.org/schema/context/spring-context-3.0.xsd
  http://www.springframework.org/schema/aop
  http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
                     
    <bean id="a1" class="com.umgsai.spring.Message"/>
</beans>