Spring依赖注入简单实现

左手的ㄟ右手 2023-05-29 02:34 28阅读 0赞

### 代码已上传，[GitHub地址][GitHub] ###

> 目标：已知InitSpring1和InitSpring2两个类，spring1中有spring2的引用，用spring框架实现spring2的注入。

1.  创建InitSpring1

public class InitSpring1 { 
        private InitSpring2 initSpring2;
        // a setter method to inject the dependency.
        public void setInitSpring2(InitSpring2 initSpring2) { 
            System.out.println("init Spring1."+"\n");
            this.initSpring2 = initSpring2;
        }
        // a getter method to return spellChecker
        public InitSpring2 getInitSpring2() { 
            return initSpring2;
        }
        public void logOut() { 
            initSpring2.logOut();
        }
    }

1.  创建InitSpring2

public class InitSpring2 { 
        public InitSpring2(){ 
            System.out.println("init Spring2."+"\n");
        }
        public void logOut() { 
            System.out.println("log out Spring2."+"\n");
        }
    }

1.  创建testSpring.xml`注意位置`

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaHVhaW9ubGluZQ_size_16_color_FFFFFF_t_70]

<?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-3.0.xsd">
        <bean id="spring1" class="yang.shuai.ysservice.entity.InitSpring1">
            <property name="initSpring2" ref="spring2"/>
        </bean>
        <bean id="spring2" class="yang.shuai.ysservice.entity.InitSpring2">
        </bean>
    </beans>

1.  创建SpringController`注意xml文件的引用路径`

@RestController//controller标识
    @RequestMapping("/spring")//请求路径
    public class SpringController { 
        @GetMapping("/getSpring")//请求路径
        public void getSpring(){ 
            //放在src目录下
            ApplicationContext context =
                    new FileSystemXmlApplicationContext("classpath:inject/testSpring.xml");
            InitSpring1 te = (InitSpring1) context.getBean("spring1");
            te.logOut();
        }
    }

1.  输出结果  
    ![在这里插入图片描述][20191101152609767.png]

[GitHub]: https://github.com/yangshuaionline/YsService
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaHVhaW9ubGluZQ_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20191101152453834.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaHVhaW9ubGluZQ==,size_16,color_FFFFFF,t_70
[20191101152609767.png]: https://img-blog.csdnimg.cn/20191101152609767.png