SpringBoot - 如何查看Spring上下文中加载的Bean

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);
    }
}