spring4.1.8扩展实战之六：注册bean到spring容器(BeanDefinitionRegistryPostProcessor接口)
本章是《spring4.1.8扩展实战》系列的第六篇，目标是学习如何通过自己写代码的方式，向spring容器中注册bean；
原文地址：https://blog.csdn.net/boling_cavalry/article/details/82193692
关于注册bean到容器
我们开发的类，如果想注册到spring容器，让spring来完成实例化，常用方式如下：
1. xml中通过bean节点来配置；
2. 使用@Service、@Controller、@Conponent等注解；
其实，除了以上方式，spring还支持我们通过代码来将指定的类注册到spring容器中，也就是今天我们要实践的主要内容，接下来就从spring源码开始，先学习源码再动手实战；
本章概要
本章由以下几部分组成：
1. 了解BeanDefinitionRegistryPostProcessor接口；
2. 分析spring容器如何使用BeanDefinitionRegistryPostProcessor接口；
3. 实战，开发BeanDefinitionRegistryPostProcessor接口的实现类，验证通过代码注册bean的功能；
了解BeanDefinitionRegistryPostProcessor接口
实现注册bean功能的关键是BeanDefinitionRegistryPostProcessor接口，来看看这接口的继承关系，如下图：
BeanDefinitionRegistryPostProcessor继承了BeanFactoryPostProcessor接口，关于BeanFactoryPostProcessor我们在上一章《spring4.1.8扩展实战之五：改变bean的定义(BeanFactoryPostProcessor接口)》已做了详细的分析和实战，知道BeanFactoryPostProcessor的实现类在其postProcessBeanFactory方法被调用时，可以对bean的定义进行控制，因此BeanDefinitionRegistryPostProcessor的实现类一共要实现以下两个方法：
1. void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException：
该方法的实现中，主要用来对bean定义做一些改变，这些在上一章《spring4.1.8扩展实战之五：改变bean的定义(BeanFactoryPostProcessor接口)》有详细说明；
2. void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException：
该方法用来注册更多的bean到spring容器中，详细观察入参BeanDefinitionRegistry接口，看看这个参数能带给我们什么能力：
从上图可以看到，为了能让我们通过代码将bean注册到spring环境，BeanDefinitionRegistry提供了丰富的方法来操作bean定义，判断、注册、反注册等方法都准备好了，我们在编写postProcessBeanDefinitionRegistry方法的内容时，就能直接使用入参registry的这些方法来完成判断和注册、反注册等操作；
分析spring容器如何使用BeanDefinitionRegistryPostProcessor接口
来看看BeanDefinitionRegistryPostProcessor接口的实现类，是在哪里被spring容器使用的：
1. 如下图所示，红框中的invokeBeanFactoryPostProcessors方法用来找出所有beanFactory后置处理器，并且调用这些处理器来改变bean的定义：
2. 打开invokeBeanFactoryPostProcessors方法，如下所示，实际操作是委托PostProcessorRegistrationDelegate去完成的：
protected void invokeBeanFactoryPostProcessors(ConfigurableListableBeanFactory beanFactory) {
PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(beanFactory, getBeanFactoryPostProcessors());
}
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3. 继续看PostProcessorRegistrationDelegate类的invokeBeanFactoryPostProcessors方法，该方法内容太丰富，我们只看重点，第一个重点如下图红框所示，当前的beanFactory是否实现了接口BeanDefinitionRegistry：
为了搞清楚这个问题，我们应该看看当前beanFactory的继承和实现，以springboot中的应用为例，当前beanFactory的类型是DefaultListableBeanFactory，来看看它的类图：
从上图红框可见，beanFactory实现了BeanDefinitionRegistry接口，因此我们的关注点是if条件满足后的执行逻辑；
4. 继续看PostProcessorRegistrationDelegate类的invokeBeanFactoryPostProcessors方法，以下片段就是操作BeanDefinitionRegistryPostProcessor的核心逻辑：
boolean reiterate = true;
while (reiterate) {
reiterate = false;
//查出所有实现了BeanDefinitionRegistryPostProcessor接口的bean名称
postProcessorNames = beanFactory.getBeanNamesForType(BeanDefinitionRegistryPostProcessor.class, true, false);
for (String ppName : postProcessorNames) {
//前面的逻辑中，已经对实现了PriorityOrdered和Ordered的bean都处理过了，因此通过processedBeans过滤，processedBeans中没有的才会在此处理
if (!processedBeans.contains(ppName)) {
//根据名称和类型获取bean
BeanDefinitionRegistryPostProcessor pp = beanFactory.getBean(ppName, BeanDefinitionRegistryPostProcessor.class);
//把已经调用过postProcessBeanDefinitionRegistry方法的bean全部放在registryPostProcessors中
registryPostProcessors.add(pp);
//把已经调用过postProcessBeanDefinitionRegistry方法的bean的名称全部放在processedBeans中
processedBeans.add(ppName);
//执行此bean的postProcessBeanDefinitionRegistry方法
pp.postProcessBeanDefinitionRegistry(registry);
//改变退出while的条件
reiterate = true;
}
}
}
//registryPostProcessors中保存了所有执行过postProcessBeanDefinitionRegistry方法的bean，
//现在再来执行这些bean的postProcessBeanFactory方法
invokeBeanFactoryPostProcessors(registryPostProcessors, beanFactory);
//regularPostProcessors中保存的是所有入参中带来的BeanFactoryPostProcessor实现类，并且这里面已经剔除了BeanDefinitionRegistryPostProcessor的实现类，现在要让这些bean执行postProcessBeanFactory方法
invokeBeanFactoryPostProcessors(regularPostProcessors, beanFactory);
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如上述代码所示，所有实现了BeanDefinitionRegistryPostProcessor接口的bean，其postProcessBeanDefinitionRegistry方法都会调用，然后再调用其postProcessBeanFactory方法，这样一来，我们如果自定义了BeanDefinitionRegistryPostProcessor接口的实现类，那么我们开发的postProcessBeanDefinitionRegistry和postProcessBeanFactory方法都会被执行一次；
到这里，我们的源码学习部分就完成了，接下来看开始实战吧；
实战，开发BeanDefinitionRegistryPostProcessor接口的实现类
本次实战的内容是创建一个springboot工程，在里面自定义一个BeanDefinitionRegistryPostProcessor接口的实现类，如果您不想敲代码，也可以去github下载源码，地址和链接信息如下表所示：
名称 链接 备注
项目主页 https://github.com/zq2599/blog_demos 该项目在GitHub上的主页
git仓库地址(https) https://github.com/zq2599/blog_demos.git 该项目源码的仓库地址，https协议
git仓库地址(ssh) git@github.com:zq2599/blog_demos.git 该项目源码的仓库地址，ssh协议
这个git项目中有多个文件夹，本章源码在文件夹customizebeandefinitionregistrypostprocessor下，如下图红框所示：
接下来开始实战吧：
1. 基于maven创建一个springboot的web工程，名为customizebeandefinitionregistrypostprocessor，pom.xml如下：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.bolingcavalry</groupId>
<artifactId>customizebeandefinitionregistrypostprocessor</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>customizebeandefinitionregistrypostprocessor</name>
<description>Demo project for customize BeanDefinitionRegistryPostProcessor</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.15.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
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2. 定义一个服务接口CalculateService：
package com.bolingcavalry.customizebeandefinitionregistrypostprocessor.service;
public interface CalculateService {
/**
* 整数加法
* @param a
* @param b
* @return
*/
int add(int a, int b);
/**
* 返回当前实现类的描述信息
* @return
*/
String getServiceDesc();
}
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3. 创建CalculateService接口的实现类CalculateServiceImpl，注意，不要将其声明为spring的bean：
package com.bolingcavalry.customizebeandefinitionregistrypostprocessor.service.impl;
import com.bolingcavalry.customizebeandefinitionregistrypostprocessor.service.CalculateService;
public class CalculateServiceImpl implements CalculateService {
private String desc = "desc from class";
public void setDesc(String desc) {
this.desc = desc;
}
@Override
public int add(int a, int b) {
return a + b;
}
@Override
public String getServiceDesc() {
return desc;
}
}
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4. 创建工具类Utils，里面是些工具方法，例如在日志中打印出当前线程的执行堆栈：
package com.bolingcavalry.customizebeandefinitionregistrypostprocessor.util;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* @Description : 提供一些常用的工具方法
* @Author : zq2599@gmail.com
* @Date : 2018-08-14 05:51
*/
public class Utils {
private static final Logger logger = LoggerFactory.getLogger(Utils.class);
/**
* 打印当前线程堆栈信息
* @param prefix
*/
public static void printTrack(String prefix){
StackTraceElement[] st = Thread.currentThread().getStackTrace();
if(null==st){
logger.info("invalid stack");
return;
}
StringBuffer sbf =new StringBuffer();
for(StackTraceElement e:st){
if(sbf.length()>0){
sbf.append(" <- ");
sbf.append(System.getProperty("line.separator"));
}
sbf.append(java.text.MessageFormat.format("{0}.{1}() {2}"
,e.getClassName()
,e.getMethodName()
,e.getLineNumber()));
}
logger.info(prefix
+ "\n************************************************************\n"
+ sbf.toString()
+ "\n************************************************************");
}
}
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5. 创建Controller类，用于验证我们通过代码注册的bean，注意要给成员变量calculateService添加注解@Autowired(required = false)，否则有的IDEAL上会有红叉提示：
package com.bolingcavalry.customizebeandefinitionregistrypostprocessor.controller;
import com.bolingcavalry.customizebeandefinitionregistrypostprocessor.service.CalculateService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class HelloController {
@Autowired(required = false)
CalculateService calculateService;
@GetMapping("/add/{a}/{b}")
public String add(@PathVariable("a") int a, @PathVariable("b") int b){
return "add result : " + calculateService.add(a, b) + ", from [" + calculateService.getServiceDesc() + "]";
}
}
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6. 创建BeanDefinitionRegistryPostProcessor的实现类CustomizeBeanDefinitionRegistryPostProcessor：
@Component
public class CustomizeBeanDefinitionRegistryPostProcessor implements BeanDefinitionRegistryPostProcessor {
@Override
public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry beanDefinitionRegistry) throws BeansException {
//打印当前堆栈信息
Utils.printTrack("execute postProcessBeanDefinitionRegistry");
//创建一个bean的定义类的对象，bean类型是CalculateServiceImpl
RootBeanDefinition helloBean = new RootBeanDefinition(CalculateServiceImpl.class);
//bean的定义注册到spring环境
beanDefinitionRegistry.registerBeanDefinition("calculateService", helloBean);
}
@Override
public void postProcessBeanFactory(ConfigurableListableBeanFactory configurableListableBeanFactory) throws BeansException {
//打印当前堆栈信息
Utils.printTrack("execute postProcessBeanFactory");
}
}
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上面CustomizeBeanDefinitionRegistryPostProcessor就是我们扩展出来的BeanDefinitionRegistryPostProcessor实现类，用来将CalculateServiceImpl注册到spring容器，名称为calculateService；
7. 启动类CustomizebeandefinitionregistrypostprocessorApplication：
package com.bolingcavalry.customizebeandefinitionregistrypostprocessor;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class CustomizebeandefinitionregistrypostprocessorApplication {
public static void main(String[] args) {
SpringApplication.run(CustomizebeandefinitionregistrypostprocessorApplication.class, args);
}
}
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8. 启动应用，在启动日志中可以看到CustomizeBeanDefinitionRegistryPostProcessor的方法被调用时的堆栈情况：
2018-08-30 18:55:40.323 INFO 14880 --- [ main] c.b.c.util.Utils : execute postProcessBeanDefinitionRegistry
************************************************************
java.lang.Thread.getStackTrace() 1,556 <-
com.bolingcavalry.customizebeandefinitionregistrypostprocessor.util.Utils.printTrack() 20 <-
com.bolingcavalry.customizebeandefinitionregistrypostprocessor.registrypostprocessor.CustomizeBeanDefinitionRegistryPostProcessor.postProcessBeanDefinitionRegistry() 21 <-
org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors() 272 <-
org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors() 122 <-
org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors() 687 <-
org.springframework.context.support.AbstractApplicationContext.refresh() 525 <-
org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh() 122 <-
org.springframework.boot.SpringApplication.refresh() 693 <-
org.springframework.boot.SpringApplication.refreshContext() 360 <-
org.springframework.boot.SpringApplication.run() 303 <-
org.springframework.boot.SpringApplication.run() 1,118 <-
org.springframework.boot.SpringApplication.run() 1,107 <-
com.bolingcavalry.customizebeandefinitionregistrypostprocessor.CustomizebeandefinitionregistrypostprocessorApplication.main() 10
************************************************************
2018-08-30 18:55:40.542 INFO 14880 --- [ main] c.b.c.util.Utils : execute postProcessBeanFactory
************************************************************
java.lang.Thread.getStackTrace() 1,556 <-
com.bolingcavalry.customizebeandefinitionregistrypostprocessor.util.Utils.printTrack() 20 <-
com.bolingcavalry.customizebeandefinitionregistrypostprocessor.registrypostprocessor.CustomizeBeanDefinitionRegistryPostProcessor.postProcessBeanFactory() 31 <-
org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors() 283 <-
org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors() 127 <-
org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors() 687 <-
org.springframework.context.support.AbstractApplicationContext.refresh() 525 <-
org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh() 122 <-
org.springframework.boot.SpringApplication.refresh() 693 <-
org.springframework.boot.SpringApplication.refreshContext() 360 <-
org.springframework.boot.SpringApplication.run() 303 <-
org.springframework.boot.SpringApplication.run() 1,118 <-
org.springframework.boot.SpringApplication.run() 1,107 <-
com.bolingcavalry.customizebeandefinitionregistrypostprocessor.CustomizebeandefinitionregistrypostprocessorApplication.main() 10
************************************************************
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9. 在浏览器输入：http://localhost:8080/add/1/2，如下图可以看到网页正常响应，controller可以正常使用calculateService实例：
10. 去掉CustomizeBeanDefinitionRegistryPostProcessor的注释@Component，重启应用，再去访问http://localhost:8080/add/1/2，可以看到网页提示错误如下图：
11. 看后台日志，是因为calculateService这个bean为空，导致HelloController在响应请求的时候出现了空指针异常，这也再次证明了CustomizeBeanDefinitionRegistryPostProcessor的注册操作是有效的：
2018-08-30 19:00:01.186 ERROR 2760 --- [nio-8080-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause
java.lang.NullPointerException: null
at com.bolingcavalry.customizebeandefinitionregistrypostprocessor.controller.HelloController.add(HelloController.java:18) ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_111]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_111]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_111]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_111]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) ~[spring-web-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133) ~[spring-web-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97) ~[spring-webmvc-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827) ~[spring-webmvc-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738) ~[spring-webmvc-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) ~[spring-webmvc-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967) ~[spring-webmvc-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901) ~[spring-webmvc-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) ~[spring-webmvc-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) ~[spring-webmvc-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:635) ~[tomcat-embed-core-8.5.32.jar:8.5.32]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) ~[spring-webmvc-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) ~[tomcat-embed-core-8.5.32.jar:8.5.32]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-8.5.32.jar:8.5.32]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.32.jar:8.5.32]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) ~[tomcat-embed-websocket-8.5.32.jar:8.5.32]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.32.jar:8.5.32]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.32.jar:8.5.32]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.32.jar:8.5.32]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.32.jar:8.5.32]
at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109) ~[spring-web-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.32.jar:8.5.32]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.32.jar:8.5.32]
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) ~[spring-web-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.32.jar:8.5.32]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.32.jar:8.5.32]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) ~[spring-web-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.32.jar:8.5.32]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.32.jar:8.5.32]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) ~[tomcat-embed-core-8.5.32.jar:8.5.32]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-8.5.32.jar:8.5.32]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493) [tomcat-embed-core-8.5.32.jar:8.5.32]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [tomcat-embed-core-8.5.32.jar:8.5.32]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) [tomcat-embed-core-8.5.32.jar:8.5.32]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [tomcat-embed-core-8.5.32.jar:8.5.32]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) [tomcat-embed-core-8.5.32.jar:8.5.32]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:800) [tomcat-embed-core-8.5.32.jar:8.5.32]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-8.5.32.jar:8.5.32]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:800) [tomcat-embed-core-8.5.32.jar:8.5.32]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1471) [tomcat-embed-core-8.5.32.jar:8.5.32]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-8.5.32.jar:8.5.32]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_111]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_111]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.5.32.jar:8.5.32]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_111]
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至此，自定义bean注册的实战就结束了，其实除了注册bean，我们还能利用BeanDefinitionRegistry这个入参做些其他事情，例如查找bean，反注册bean等，帮助我们实现一些bean操作的业务需求；
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作者：博陵精骑
来源：CSDN
原文：https://blog.csdn.net/boling_cavalry/article/details/82193692
版权声明：本文为博主原创文章，转载请附上博文链接！
