Spring实战——让Bean获取Spring容器

古城微笑少年丶 2021-07-24 12:00 412阅读 0赞

**一 配置**

<?xml version="1.0" encoding="GBK"?>
    <beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://www.springframework.org/schema/beans"
         xsi:schemaLocation="http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans-4.0.xsd">
         
         <bean id="messageSource"
         class="org.springframework.context.support.ResourceBundleMessageSource">
               <property name="basenames">
                    <list>
                         <value>message</value>
                    </list>
               </property>
         </bean>
         
         <bean id="person" class="org.crazyit.app.service.Person"/>
    </beans>

**二 资源文件**

hello=\u6b22\u8fce\u4f60\uff0c{0}
    now=\u73b0\u5728\u65f6\u95f4\u662f\uff1a{0}

**三 Bean**

package org.crazyit.app.service;
    
    import org.springframework.context.*;
    import org.springframework.beans.BeansException;
    import java.util.Locale;
    
    
    public class Person implements ApplicationContextAware
    {
        // 将BeanFactory容器以成员变量保存
        private ApplicationContext ctx;
    
        /* Spring容器会检测容器中所有Bean，如果发现某个Bean实现了ApplicationContextAware接口，
        Spring容器会在创建该Bean之后，自动调用该方法，调用该方法时，
        会将容器本身作为参数传给该方法。*/
        public void setApplicationContext(ApplicationContext ctx)
            throws BeansException
        {
            this.ctx = ctx;
        }
        public void sayHi(String name)
        {
            System.out.println(ctx.getMessage("hello" , new String[]{name}
                , Locale.getDefault(Locale.Category.FORMAT)));
        }
    }

**四 测试类**

package lee;
    
    import java.io.*;
    import org.springframework.context.*;
    import org.springframework.context.support.*;
    
    import org.crazyit.app.service.*;
    
    public class SpringTest
    {
        public static void main(String[] args)throws Exception
        {
            ApplicationContext ctx = new
                ClassPathXmlApplicationContext("beans.xml");
            Person p = ctx.getBean("person" , Person.class);
            p.sayHi("孙悟空");
        }
    }

**五 测试结果**

欢迎你，孙悟空