初学Spring（1）

新建问候接口

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package com.shunwang.spring;public interface GreetingService {public void sayGreeting();}

接口的实现类

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package com.shunwang.spring;public class GreetingServiceImpl implements GreetingService{private String greeting;public String getGreeting() {return greeting;}public void setGreeting(String greeting) {this.greeting = greeting;}public void sayGreeting(){System.out.println(greeting);}public GreetingServiceImpl(){}public GreetingServiceImpl(String greeting){this.greeting = greeting;}}

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spring配置文件 hello.xml放在src目录下

在<bean>元素中，<property>元素表示设置属性值。? 例如此处：使用<property>,告诉Spring容器通过Bean的setGreeting()方法来设置其属性值.

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN""http://www.springframework.org//dtd/spring-beans.dtd"><!--通过set方法注入--><beans><bean id="greetingService"name="code">package com.shunwang.spring;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;public class HelloApp {public static void main(String[] args) throws Exception{ApplicationContext context = new ClassPathXmlApplicationContext("hello.xml");GreetingService greetingService = (GreetingService)context.getBean("greetingService");greetingService.sayGreeting();}}