怎样查看 spring IoC 容器有哪些 bean

方法1：（可行）只能查看部分 getBeanDefinitionNames 中的Bean。

package com.itheima.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.Arrays;
import java.util.List;

@RestController
@RequestMapping
public class ViewAllBeans {

    @Autowired
    private ApplicationContext applicationContext;

    @GetMapping("/beanList")
    public List<String> beanList() {
        return Arrays.asList(applicationContext.getBeanDefinitionNames());
    }
}

方法2：

public static void main(String args[]) {
  ApplicationContext context=new ClassPathXmlApplicationContext("classpath:spring-applicationContext.xml");
  Object user= context.getBean("userController");
  String[] str=context.getBeanDefinitionNames();
  for (String string : str) {
  　　System.out.println("..."+string);
  }
  System.out.println("----"+user);

}
// REF https://blog.csdn.net/chengjunhua19890809/article/details/77981839

方法3：

import org.springframework.beans.BeansException;

import org.springframework.beans.factory.InitializingBean;

import org.springframework.context.ApplicationContext;

import org.springframework.context.ApplicationContextAware;

import org.springframework.stereotype.Component;


public class SpringContextHolder implements ApplicationContextAware {
 
    private static ApplicationContext applicationContext;
 
    public void setApplicationContext(ApplicationContext applicationContext)
            throws BeansException {
        SpringContextHolder.applicationContext = applicationContext;
    }
 
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }
 
    public static void printAllBeans() {
        String[] beans = SpringContextHolder.getApplicationContext()
                .getBeanDefinitionNames();
        for (String beanName : beans) {
            Class<?> beanType = SpringContextHolder.getApplicationContext()
                    .getType(beanName);
            System.out.println("BeanName:" + beanName);
            System.out.println("Bean的类型：" + beanType);
            System.out.println("Bean所在的包：" + beanType.getPackage());
            System.out.println("Bean：" + SpringContextHolder.getApplicationContext().getBean(
                    beanName));
        }
    }
 
}

方法4：

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
 
import java.util.Arrays;
import java.util.List;
 
@RestController
@RequestMapping
public class BeanController {
 
    @Autowired
    private ApplicationContext applicationContext;
 
    @GetMapping("/beanList")
    public List<String> beanList() {
        return Arrays.asList(applicationContext.getBeanDefinitionNames());
    }
}