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深入学习Spring组件注册
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‎50.Spring-Regist-Bean/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" 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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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>2.1.0.RELEASE</version>
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<relativePath/> <!-- lookup parent from repository -->
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</parent>
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<groupId>cc.mrbird</groupId>
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<artifactId>demo</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<name>demo</name>
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<description>Demo project for Spring Boot</description>
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<properties>
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<java.version>1.8</java.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter</artifactId>
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</dependency>
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<dependency>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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<optional>true</optional>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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</plugin>
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</plugins>
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</build>
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</project>

‎50.Spring-Regist-Bean/src/main/java/cc/mrbird/DemoApplication.java‎

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package cc.mrbird;
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import cc.mrbird.demo.config.WebConfig;
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import cc.mrbird.demo.service.CalculateService;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.WebApplicationType;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.boot.builder.SpringApplicationBuilder;
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import org.springframework.context.ApplicationContext;
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import org.springframework.context.ConfigurableApplicationContext;
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import org.springframework.context.annotation.AnnotationConfigApplicationContext;
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import java.util.Arrays;
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@SpringBootApplication
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public class DemoApplication {
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public static void main(String[] args) {
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ConfigurableApplicationContext context1 = new SpringApplicationBuilder(DemoApplication.class)
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.web(WebApplicationType.NONE)
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.profiles("java7")
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.run(args);
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// 返回 IOC 容器，使用注解配置，传入配置类
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ApplicationContext context = new AnnotationConfigApplicationContext(WebConfig.class);
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System.out.println("容器创建完毕");
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// User user = context.getBean(User.class);
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// System.out.println(user);
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// 查看 User 这个类在 Spring 容器中叫啥玩意
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// String[] beanNames = context.getBeanNamesForType(User.class);
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// Arrays.stream(beanNames).forEach(System.out::println);
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// 查看基于注解的 IOC容器中所有组件名称
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String[] beanNames = context.getBeanDefinitionNames();
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Arrays.stream(beanNames).forEach(System.out::println);
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// 组件的作用域
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// Object user1 = context.getBean("user");
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// Object user2 = context.getBean("user");
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// System.out.println(user1 == user2);
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// 测试懒加载
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// Object user1 = context.getBean("user");
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// Object user2 = context.getBean("user");
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// 测试 Profile
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CalculateService service = context1.getBean(CalculateService.class);
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System.out.println("求合结果： " + service.sum(1, 2, 3, 4, 5, 6, 7, 8, 9, 10));
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// FactoryBean测试
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Object cherry = context.getBean("cherryFactoryBean");
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System.out.println(cherry.getClass());
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Object cherryFactoryBean = context.getBean("&cherryFactoryBean");
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System.out.println(cherryFactoryBean.getClass());
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}
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}
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‎50.Spring-Regist-Bean/src/main/java/cc/mrbird/demo/condition/MyCondition.java‎

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package cc.mrbird.demo.condition;
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import org.springframework.context.annotation.Condition;
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import org.springframework.context.annotation.ConditionContext;
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import org.springframework.core.type.AnnotatedTypeMetadata;
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/**
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* @author MrBird
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*/
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public class MyCondition implements Condition {
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@Override
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public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {
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String osName = context.getEnvironment().getProperty("os.name");
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return osName != null && osName.contains("Windows");
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}
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}

‎50.Spring-Regist-Bean/src/main/java/cc/mrbird/demo/config/WebConfig.java‎

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package cc.mrbird.demo.config;
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import cc.mrbird.demo.condition.MyCondition;
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import cc.mrbird.demo.domain.Hello;
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import cc.mrbird.demo.domain.User;
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import cc.mrbird.demo.factory.CherryFactoryBean;
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import cc.mrbird.demo.filter.MyTypeFilter;
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import cc.mrbird.demo.register.MyImportBeanDefinitionRegistrar;
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import cc.mrbird.demo.selector.MyImportSelector;
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import lombok.Builder;
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import org.springframework.context.annotation.*;
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import org.springframework.context.annotation.ComponentScan.Filter;
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import org.springframework.stereotype.Controller;
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import org.springframework.stereotype.Repository;
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import org.springframework.stereotype.Service;
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/**
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* @author MrBird
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*/
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@Configuration
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// @ComponentScan(value = "cc.mrbird.demo"
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// , excludeFilters = {
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// @Filter(type = FilterType.ANNOTATION,
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// classes = {Controller.class, Repository.class}),
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// @Filter(type = FilterType.ASSIGNABLE_TYPE, classes = User.class)
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// @Filter(type = FilterType.CUSTOM, classes = MyTypeFilter.class)
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// }
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// includeFilters = {
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// @Filter(type = FilterType.ANNOTATION, classes = Service.class)
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// }, useDefaultFilters = false
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// )
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@Import({Hello.class, MyImportSelector.class, MyImportBeanDefinitionRegistrar.class})
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public class WebConfig {
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@Bean
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// @Conditional(MyCondition.class)
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// @Lazy
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// @Scope("prototype")
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public User user() {
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System.out.println("往IOC容器中注册user bean");
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return new User("mrbird", 18);
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}
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@Bean
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public CherryFactoryBean cherryFactoryBean() {
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return new CherryFactoryBean();
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}
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}

‎50.Spring-Regist-Bean/src/main/java/cc/mrbird/demo/controller/UserController.java‎

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package cc.mrbird.demo.controller;
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import org.springframework.stereotype.Controller;
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/**
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* @author MrBird
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*/
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@Controller
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public class UserController {
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}

‎50.Spring-Regist-Bean/src/main/java/cc/mrbird/demo/dao/UserMapper.java‎

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package cc.mrbird.demo.dao;
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import org.springframework.stereotype.Repository;
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/**
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* @author MrBird
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*/
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@Repository
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public class UserMapper {
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}

‎50.Spring-Regist-Bean/src/main/java/cc/mrbird/demo/domain/Apple.java‎

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package cc.mrbird.demo.domain;
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/**
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* @author MrBird
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*/
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public class Apple {
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}

‎50.Spring-Regist-Bean/src/main/java/cc/mrbird/demo/domain/Banana.java‎

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package cc.mrbird.demo.domain;
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/**
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* @author MrBird
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*/
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public class Banana {
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}

‎50.Spring-Regist-Bean/src/main/java/cc/mrbird/demo/domain/Cherry.java‎

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package cc.mrbird.demo.domain;
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/**
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* @author MrBird
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*/
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public class Cherry {
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}

‎50.Spring-Regist-Bean/src/main/java/cc/mrbird/demo/domain/Hello.java‎

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package cc.mrbird.demo.domain;
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/**
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* @author MrBird
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*/
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public class Hello {
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}

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