Spring入门注解版

时间：2018-03-07 18:53:52 阅读：213 评论：0 收藏：0 [点我收藏+]

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参照博文Spring入门一，以理解注解的含义。

项目结构：

技术分享图片

实现类：SpringHelloWorld

package com.yibai.spring.helloworld.impl;

import org.springframework.stereotype.Component;

import com.yibai.spring.helloworld.HelloWorld;

@Component
public class SpringHelloWorld implements HelloWorld{

    @Override
    public void sayHello() {
        System.out.println("spring hello world");
        
    }

}

实现类：strutsHelloWorld

package com.yibai.spring.helloworld.impl;

import org.springframework.stereotype.Component;

import com.yibai.spring.helloworld.HelloWorld;

@Component
public class StrutsHelloWorld implements HelloWorld{

    @Override
    public void sayHello() {
        System.out.println("struts hello world");
    }

}

service类：

package com.yibai.spring.helloworld;

import javax.annotation.Resource;
import org.springframework.stereotype.Service;
import com.yibai.spring.helloworld.impl.SpringHelloWorld;
import com.yibai.spring.helloworld.impl.StrutsHelloWorld;

@Service
public class HelloWorldService {

    @Resource
    private SpringHelloWorld helloWorld;
    
    @Resource
    private StrutsHelloWorld helloWorld2;
    
    public HelloWorldService(){
        
    }

    public void show(){
        helloWorld.sayHello();
        helloWorld2.sayHello();
    }
    
    
}

主方法类：

package com.yibai.spring;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.yibai.spring.helloworld.HelloWorldService;

public class HelloProgram {

    public static void main(String[] args) {
        
        // 创建上下文对象
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        
        HelloWorldService service = (HelloWorldService) context.getBean("helloWorldService");
        
        service.show();
        
    }
}

配置类：web.xml不变，spring配置applocationContext.xml改为支持注解

<?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:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd">
 -->
<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-2.5.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-2.5.xsd">

    <context:component-scan base-package="com.yibai.spring"/>


</beans>