src/main/java/tech/mhuang/ext/springboot/context/SpringBootExtAutoConfiguration.java
/**
     * create context process tool
     *
     * @return SpringContextHolder
     */
create context process tool
@return SpringContextHolder
create context process tool @return SpringContextHolder
@Bean
    @ConditionalOnMissingBean
    public SpringContextHolder contextHolder() {
        return new SpringContextHolder();
    }
@ Bean @ ConditionalOnMissingBean public SpringContextHolder contextHolder ( ) { return new SpringContextHolder ( ) ; }
create context process tool
 @return SpringContextHolder
create context process tool @return SpringContextHolder