自己的模块中引用Spring源码

川长思鸟来 2022-10-29 09:23 188阅读 0赞

### 文章目录 ###

*   *   *  一. 新建自己的模块
         *  二. 学好Spring源码的建议

### 一. 新建自己的模块 ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzMjI5NjY5_size_16_color_FFFFFF_t_70][]  
接着写一个接口

package com.demo.service;
    
    /** * 类名称:WelcomeService * 类描述:TODO * * @author: https://javaweixin6.blog.csdn.net/ * 创建时间:2021/2/11 15:58 * Version 1.0 */
    public interface WelcomeService { 
    
    	public String sayHello(String name);
    
    }

编写接口的实现类

public class WelcomeServiceImpl implements WelcomeService { 
    
    	@Override
    	public String sayHello(String name) { 
    		System.out.println("欢迎你 "+ name);
    		return "success";
    	}
    }

编写配置文件, 把bean注入到容器中去 .  
![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzMjI5NjY5_size_16_color_FFFFFF_t_70 1][]

<?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">
    
        
    	<bean id="welcomeService" class="com.demo.service.Impl.WelcomeServiceImpl"> </bean>
    </beans>

在build.gradle 中, 引入依赖Sping的依赖. 注意此时引用的就是本地的依赖`compile(project(":spring-context"))`  
![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzMjI5NjY5_size_16_color_FFFFFF_t_70 2][]  
写一个运行函数.  
该main方法, 就是从xml中获取bean的定义, 再通过ApplicationContext ,获取Bean. 获取到bean后, 调用sayHello方法进行打印.

import com.demo.service.WelcomeService;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.FileSystemXmlApplicationContext;
    public class Entrance { 
    	public static void main(String[] args) { 
    		System.out.println(" Hello World ");
    		String xmlPath = "D:\\mycode\\spring_study\\spring-framework-5.2.0.RELEASE\\springdemo\\src\\main\\resources\\spring\\spring-config.xml";
    		ApplicationContext applicationContext = new FileSystemXmlApplicationContext(xmlPath);
    		WelcomeService welcomeService = (WelcomeService) applicationContext.getBean("welcomeService");
    		welcomeService.sayHello("spring hello world ");
    	}
    }

运行程序后, 打印结果如下.  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzMjI5NjY5_size_16_color_FFFFFF_t_70 3]

### 二. 学好Spring源码的建议 ###

1.  首先要熟练使用Spring框架. 多看官方文档.
2.  多调试代码
3.  多掌握设计模式, 和注解

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