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转载-通过ApplicationContext 去获取所有的Bean
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Spring Boot - 获取所有的Bean信息
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前言
通过ApplicationContext 去获取所有的Bean
前言
Spring Boot启动的时候需要加载许多Bean实现最小化配置,本文将尝试找出Spring启动后加载的所有Bean信息; 通过ApplicationContext 去获取所有的Bean
通过CommandLineRunner接口,可以实现在Spring Boot完全启动后执行一些代码逻辑,本文将执行的逻辑是打印所有Bean的信息;
1) 通过 ApplicationContext.getBeanDefinitionNames() 方法获取所有Bean的名称;
2) 通过 ApplicationContext.getBean(beanName)获取Bean的详细信息; 具体代码实现如下: package com.howtodoinjava.app.controller; import java.util.Arrays; 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.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.support.SpringBootServletInitializer;
import org.springframework.context.ApplicationContext; @SpringBootApplication
public class SpringBootWebApplication extends SpringBootServletInitializer implements CommandLineRunner { @Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(SpringBootWebApplication.class);
} public static void main(String[] args) throws Exception {
SpringApplication.run(SpringBootWebApplication.class, args);
} @Autowired
private ApplicationContext appContext; @Override
public void run(String... args) throws Exception
{
String[] beans = appContext.getBeanDefinitionNames();
Arrays.sort(beans);
for (String bean : beans)
{
System.out.println(bean + " of Type :: " + appContext.getBean(bean).getClass());
}
}
}
运行以上程序,控制台将打印如下信息: 2017-03-06 13:22:50 - Tomcat started on port(s): 8080 (http) basicErrorController of Type :: class org.springframework.boot.autoconfigure.web.BasicErrorController
beanNameHandlerMapping of Type :: class org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping
beanNameViewResolver of Type :: class org.springframework.web.servlet.view.BeanNameViewResolver
characterEncodingFilter of Type :: class org.springframework.boot.web.filter.OrderedCharacterEncodingFilter
conventionErrorViewResolver of Type :: class org.springframework.boot.autoconfigure.web.DefaultErrorViewResolver
defaultServletHandlerMapping of Type :: class org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport$EmptyHandlerMapping
defaultViewResolver of Type :: class org.springframework.web.servlet.view.InternalResourceViewResolver
dispatcherServlet of Type :: class org.springframework.web.servlet.DispatcherServlet
dispatcherServletRegistration of Type :: class org.springframework.boot.web.servlet.ServletRegistrationBean
duplicateServerPropertiesDetector of Type :: class org.springframework.boot.autoconfigure.web.ServerPropertiesAutoConfiguration$DuplicateServerPropertiesDetector
embeddedServletContainerCustomizerBeanPostProcessor of Type :: class org.springframework.boot.context.embedded.EmbeddedServletContainerCustomizerBeanPostProcessor
error of Type :: class org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration$SpelView
errorAttributes of Type :: class org.springframework.boot.autoconfigure.web.DefaultErrorAttributes
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