SpringBoot - 如何查看Spring上下文中加载的Bean

清疚 2023-10-08 14:48 12阅读 0赞

## 方法一： ##

import lombok.extern.slf4j.Slf4j;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.boot.CommandLineRunner;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.context.ApplicationContext;
    import java.util.Arrays;
    
    /**
     * @author ROCKY
     */
    
    @SpringBootApplication
    @Slf4j
    public class DroolsxApplication implements CommandLineRunner {
        
        public static void main(String[] args) {
        
            SpringApplication.run(DroolsxApplication.class, args);
            log.info("规则引擎测试服务启动成功, 正在监听中...");
        }
    
        @Autowired
        private ApplicationContext context;
    
        @Override
        public void run(String... args) throws Exception {
        
    
            String[] beans = context.getBeanDefinitionNames();
            Arrays.sort(beans);
            for (String bean : beans) {
        
                log.info(bean);
            }
        }
    }

--------------------

## 方法二： ##

import lombok.extern.slf4j.Slf4j;
    import org.springframework.boot.CommandLineRunner;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.annotation.Bean;
    import java.util.Arrays;
    
    /**
     * @author ROCKY
     */
    
    @SpringBootApplication
    @Slf4j
    public class DroolsxApplication {
        
        public static void main(String[] args) {
        
            SpringApplication.run(DroolsxApplication.class, args);
            log.info("规则引擎测试服务启动成功, 正在监听中...");
        }
    
        @Bean
        public CommandLineRunner run(ApplicationContext context) {
        
            return args -> {
        
                String[] beans = context.getBeanDefinitionNames();
                Arrays.stream(beans).sorted().forEach(System.out::println);
            };
        }
    }

--------------------

## 方法三： ##

import lombok.extern.slf4j.Slf4j;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.context.ConfigurableApplicationContext;
    import java.util.Arrays;
    
    /**
     * @author ROCKY
     */
    @SpringBootApplication
    @Slf4j
    public class DroolsxApplication{
        
        public static void main(String[] args) {
        
            ConfigurableApplicationContext context = SpringApplication.run(DroolsxApplication.class, args);
            String[] beans = context.getBeanDefinitionNames();
            Arrays.stream(beans).sorted().forEach(System.out::println);
            log.info("规则引擎测试服务启动成功, 正在监听中...");
        }
    }

--------------------

## 方法四： ##

> 自定义工具类 SpringUtils，实现 ApplicationContextAware接口。Spring容器会检测容器中的所有Bean，如果发现某个Bean实现了ApplicationContextAware接口，Spring容器会在创建该Bean之后，自动调用该Bean的setApplicationContext(ApplicationContext applicationContext)方法，并将容器本身作为参数传给该方法。  
> 调用方法：String beanNames\[\] = SpringUtils.getApplicationContext().getBeanDefinitionNames();  
>

package com.hadoopx.drools.util;
    
    import org.springframework.beans.BeansException;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.ApplicationContextAware;
    import org.springframework.stereotype.Component;
    
    /**
     * @author ROCKY
     */
    
    @Component
    public class SpringUtils implements ApplicationContextAware {
        
    
        private static ApplicationContext applicationContext;
    
        @Override
        public void setApplicationContext(ApplicationContext applicationContext)
                throws BeansException {
        
            if (SpringUtils.applicationContext == null) {
        
                SpringUtils.applicationContext = applicationContext;
            }
        }
    
        // 获取ApplicationContext
        public static ApplicationContext getApplicationContext() {
        
            return applicationContext;
        }
    
        // 根据NAME获取Bean
        public static Object getBean(String name) {
        
            return getApplicationContext().getBean(name);
        }
    
        // 根据CLASS获取Bean
        public static <T> T getBean(Class<T> clazz) {
        
            return getApplicationContext().getBean(clazz);
        }
    
        // 根据NAME,CLASS获取Bean
        public static <T> T getBean(String name, Class<T> clazz) {
        
            return getApplicationContext().getBean(name, clazz);
        }
    }