springboot学习项目

package com.zzw.springboot; import com.zzw.springboot.bean.Cat; import com.zzw.springboot.bean.Dog; import com.zzw.springboot.bean.Monster; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.context.ApplicationContext; /** * @author 赵志伟 * @version 1.0 */ @SuppressWarnings({"all"}) /** * @SpringBootApplication: 表示这是一个springboot引用/项目 * @SpringBootApplication(scanBasePackages = "com.zzw") * 解读: scanBasePackages = "com.zzw" 指定SpringBoot要扫描的包和子包 * 如果有多个包, 可以这样指定: 用数组 scanBasePackages = {"com.zzw","xxx.yyy.zzz"} */ @SpringBootApplication(scanBasePackages = "com.zzw") public class MainApp { public static void main(String[] args) { //启动springboot应用程序/项目 ApplicationContext ioc = SpringApplication.run(MainApp.class, args); //如何查看容器中注入的组件 //① 打断点 //② 写代码 //String[] beanDefinitionNames = ioc.getBeanDefinitionNames(); //for (String beanDefinitionName : beanDefinitionNames) { // System.out.println("beanDefinitionName=" + beanDefinitionName); //} //演示Spring中传统的注解依然可以使用 @controler @service @repository //A aBean = ioc.getBean(A.class); //System.out.println("aBean=" + aBean); //=====演示在springboot项目，依然可以使用spring的配置bean/注入bean/获取bean方式 start=== //ApplicationContext ac = // new ClassPathXmlApplicationContext("beans.xml"); //Monster monster = ac.getBean("monster" , Monster.class); //System.out.println("monster=" + monster); //=====演示在springboot项目，依然可以使用spring的配置bean/注入bean/获取bean方式 end===== //=====演示在springboot项目中，@Configuration的使用 start=== //Monster monster01 = ioc.getBean("monster01" , Monster.class); //Monster monster02 = ioc.getBean("monster01" , Monster.class); //System.out.println("monster01=" + monster01 + " " + monster01.hashCode()); //System.out.println("monster02=" + monster02 + " " + monster02.hashCode()); //=====演示在springboot项目中，@Configuration的使用 end===== //=====演示 配置类-bean也会注入到容器 start=== //BeanConfig beanConfig = ioc.getBean("beanConfig", BeanConfig.class); //System.out.println("beanConfig=" + beanConfig + " " + beanConfig.hashCode());//beanConfig=com.zzw.springboot.config.BeanConfig$$EnhancerBySpringCGLIB$$ff5fd0e4@45cec376 1171178358 //=====演示 配置类-bean也会注入到容器 end===== //=====演示 @Configuration(proxyBeanMethods = xxx) start=== //1.先得到BeanConfig组件 //BeanConfig beanConfig = ioc.getBean("beanConfig", BeanConfig.class); //Monster monster_01 = beanConfig.monster01(); //Monster monster_02 = beanConfig.monster01(); //System.out.println("monster_01--" + monster_01 + " " + monster_01.hashCode()); //System.out.println("monster_02--" + monster_02 + " " + monster_02.hashCode()); //特别说明: proxyBeanMethods 是在 调用@Bean方法 才生效. 因此, 需要先获取BeanConfig 组件, 再调用方法 //1. 而不是直接通过 SpringBoot 主程序得到的容器来获取bean, 注意观察直接通过ioc.getBean() 获取Bean, proxyBeanMethods 值并没有生效 //Monster monster01 = ioc.getBean("monster01", Monster.class); //Monster monster02 = ioc.getBean("monster01", Monster.class); //System.out.println("monster01--" + monster01 + " " + monster01.hashCode()); //System.out.println("monster02--" + monster02 + " " + monster02.hashCode()); //=====演示 @Configuration(proxyBeanMethods = xxx) end=== //=====测试可以有多个配置类 start=== //两个配置类注入的Bean都生效 //Monster monster02 = ioc.getBean("monster02", Monster.class); //Monster monster01 = ioc.getBean("monster01", Monster.class); //System.out.println("monster02--" + monster02); //System.out.println("monster01--" + monster01); //=====测试可以有多个配置类 end=== //=====测试@Import 使用 start=== //Dog dogBean = ioc.getBean(Dog.class); //Cat catBean = ioc.getBean(Cat.class); //System.out.println("dogBean---" + dogBean); //System.out.println("catBean---" + catBean); //=====测试@Import 使用 end=== //=====测试@ConditionalOnBean 使用 start=== //Dog dog01 = ioc.getBean("dog01", Dog.class); //System.out.println("dog01---" + dog01); //=====测试@ConditionalOnBean 使用 end=== //=====演示@ImportResource 使用 start=== Monster monster = ioc.getBean("monster", Monster.class); System.out.println("monster---" + monster); System.out.println("monster bean 是否存在-" + ioc.containsBean("monster")); Monster monster03 = ioc.getBean("monster03", Monster.class); System.out.println("monster03---" + monster03); System.out.println("monster03 bean 是否存在-" + ioc.containsBean("monster03")); //=====演示@ImportResource 使用 end=== } }