Spring 基本配置

1.写一个 applicationContext.xml,  schema取自: ${spring}/docs/spring-framework-reference/htmlsingle/index.html

<?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">
    
    <!-- 配置 spring 的 bean -->
    <bean id="greetingService" class="service.GreetingService">
        <property name="greeting">
            <value>hello world</value>
        </property>
    </bean>

</beans> 

 

 

2.一个 POJO

public class GreetingService {

    /* 属性 */
    private String greeting;

    public String getGreeting() {
    
        return greeting;
    }
    public void setGreeting(String greeting) {
    
        this.greeting = greeting;
    }
}

 

3.使用

// 初始化 应用 上下文
ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");

// 获取 Bean
GreetingService gService = (GreetingService) ac.getBean("greetingService");

// 使用
System.out.println(gService.getGreeting());