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‎javaframework/spring/第四节课/code/spring_annotation_study/.idea/compiler.xml‎

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‎javaframework/spring/第四节课/code/spring_annotation_study/.idea/misc.xml‎

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‎javaframework/spring/第四节课/code/spring_annotation_study/.idea/workspace.xml‎

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‎javaframework/spring/第四节课/code/spring_annotation_study/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.mashibing</groupId>
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<artifactId>spring_annotation_study</artifactId>
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<version>1.0-SNAPSHOT</version>
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<dependencies>
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<!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-context</artifactId>
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<version>5.2.3.RELEASE</version>
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</dependency>
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<!-- https://mvnrepository.com/artifact/junit/junit -->
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.12</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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</project>

‎javaframework/spring/第四节课/code/spring_annotation_study/spring_annotation_study.iml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<module type="JAVA_MODULE" version="4" />

‎javaframework/spring/第四节课/code/spring_annotation_study/src/main/java/com/mashibing/bean/Student.java‎

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package com.mashibing.bean;
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public class Student {
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}

‎javaframework/spring/第四节课/code/spring_annotation_study/src/main/java/com/mashibing/bean/Teacher.java‎

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package com.mashibing.bean;
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public class Teacher {
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}

‎javaframework/spring/第四节课/code/spring_annotation_study/src/main/java/com/mashibing/controller/PersonController.java‎

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package com.mashibing.controller;
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import com.mashibing.dao.PersonDao;
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import com.mashibing.service.PersonService;
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import com.mashibing.service.PersonService2;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.beans.factory.annotation.Qualifier;
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import org.springframework.stereotype.Controller;
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import javax.annotation.Resource;
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@Controller
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//@Scope(value = "prototype")
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public class PersonController {
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/**
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* 通过@AutoWired注解能够完成自动注入的功能
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* 是按照什么方式进行自动注入的呢？
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* 默认情况下是按照ByType来进行装配的,如果找到直接赋值，找不到报错
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* 如果有多个类型一样的bean对象，此时会按照id来进行查找，默认的id是类名首字符小写
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* 如果找到了直接注入，如果找不到那么就报错
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* <p>
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* 如果你想通过名字进行查找，可以自己规定名称，使用注解@Qualifier
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* <p>
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* 当@AutoWired添加到方法上的时候，此方法在创建对象的时候会默认调用，同时方法中的参数会进行自动装配
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*
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* @Qualifier注解也可以定义在方法的参数列表中,可以指定当前属性的id名称 使用@Resource可以完成跟@AutoWired相同的功能，但是要注意他们之间的区别
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* 1、@Resource是jdk提供的功能，@AutoWired是spring提供的功能
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* 2、@Resource可以在其他框架中使用，而@AutoWired只能在spring中使用
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* 换句话说：@Resource扩展性好，而@AutoWired支持的框架比较单一
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* 3、@Resource是按照名称进行装配的，如果名字找不到，那么就使用类型
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* 而@AutoWired是按照类型进行装配，如果类型找不到那么久使用名字进行查找
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*/
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@Resource
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// @Autowired
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// @Qualifier("personService")
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private PersonService personService;
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public void save() {
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personService.save();
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}
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// @Autowired
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// public void test(@Qualifier("personDao") PersonDao personDao123) {
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// System.out.println("test");
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// personDao123.update();
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// }
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}

‎javaframework/spring/第四节课/code/spring_annotation_study/src/main/java/com/mashibing/dao/BaseDao.java‎

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package com.mashibing.dao;
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public abstract class BaseDao<T> {
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public abstract void save();
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}

‎javaframework/spring/第四节课/code/spring_annotation_study/src/main/java/com/mashibing/dao/PersonDao.java‎

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package com.mashibing.dao;
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import org.springframework.stereotype.Repository;
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@Repository
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public class PersonDao {
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public void save(){
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System.out.println("保存成功");
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}
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public void update(){
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System.out.println("更新成功");
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}
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}

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