思路:
1.实现Spring的ApplicationContextAware接口,重写setApplicationContext方法,将得到的ApplicationContext对象保存到一个静态变量中,有了这个上下文对象,就可以在项目的任意地方用它来得到任意Bean;
2.调用applicationContext.getBeanDefinitionNames()方法就可以拿到Spring容器中所有的Bean名称;这里为了测试方便就直接在InitializingBean 接口的afterPropertiesSet方法中打印所有Bean名称;启动Spring容器,观察控制台即可看到打印结果,打印Spring容器中所有bean在项目调试的时候很有用。
1 import org.springframework.beans.BeansException; 2 import org.springframework.beans.factory.InitializingBean; 3 import org.springframework.context.ApplicationContext; 4 import org.springframework.context.ApplicationContextAware; 5 import org.springframework.stereotype.Component; 6 7 /** 8 * 打印Spring容器所有的Bean名称 9 *10 * @author syj11 */12 @Component13 public class ApplicationContextBean implements ApplicationContextAware, InitializingBean {14 15 public static ApplicationContext applicationContext;16 17 /**18 * 获取 ApplicationContext19 *20 * @param applicationContext21 * @throws BeansException22 */23 @Override24 public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {25 ApplicationContextBean.applicationContext = applicationContext;26 }27 28 /**29 * 打印IOC容器中所有的Bean名称30 *31 * @throws Exception32 */33 @Override34 public void afterPropertiesSet() throws Exception {35 String[] names = applicationContext.getBeanDefinitionNames();36 for (String name : names) {37 System.out.println(">>>>>>" + name);38 }39 System.out.println("------\nBean 总计:" + applicationContext.getBeanDefinitionCount());40 }41 }
还有一种更简单的方式,直接使用@Autowired注入ApplicationContext对象:
1 import org.springframework.beans.factory.annotation.Autowired; 2 import org.springframework.context.ApplicationContext; 3 import org.springframework.web.bind.annotation.GetMapping; 4 import org.springframework.web.bind.annotation.RequestMapping; 5 import org.springframework.web.bind.annotation.RestController; 6 7 import java.util.Arrays; 8 import java.util.List; 9 10 @RestController11 @RequestMapping12 public class BeanController {13 14 @Autowired15 private ApplicationContext applicationContext;16 17 @GetMapping("/beanList")18 public ListbeanList() {19 return Arrays.asList(applicationContext.getBeanDefinitionNames());20 }21 }