Programmer Group

POI is often used to export excel, but if you have to write your own every time you export, it will be more troublesome, and the code is basically repeated. So recently, I spent a little time and studied. According to the annotation and reflection technology, I wrote a tool class for POI to export ex ...

Automatic assembly of beans can simplify our code. Here is an example. First, create three entity classes package com.zhiying.pojo; public class Cat { public void shout() { System.out.println("miao~"); } } package com.zhiying.pojo; public class Dog { public void shout() { ...

Reprinted from: https://www.jianshu.com/p/2fc92a929e8e Narration In order to prevent the API without token access from being called infinitely, some services need to be API restricted. It's like taking some interfaces for registration or sending verification codes. If they are called maliciously an ...

Catalog 1 define data structure by mapping of es Default data type of Es The mapping structure of es is defined as follows 2 import Jest dependency 3. Import mysql data for es Configure application.properties Define the java class corresponding to es data structure Insert mysql data into es ...

200104 spring web series tutorialresttemplate 4xx / 5xx exception information capture Recently, when using RestTemplate to access external resources, an interesting problem was found. Because the permission verification fails, the http code of 401 returned by the other party will also contain some exception prompt information in the returned ...

According to the different levels of abstraction, factory pattern can be divided into three types: simple factory pattern (also known as static factory pattern), factory method pattern described in this paper, and abstract factory pattern. Advantages of factory mode: It can make the code structure cle ...

Article Directory 1 Source Entry Interpretation of core source code of 2 sqlSession.getMapper(...) method 2.1 What should be analyzed without looking at the source code 2.2 [Source Code Analysis] Get the MapperProxyFactory object corresponding to TUserMapper 2.3 [Source Code Analysis] Use dynamic pr ...

Catalog 1. A brief overview of the important role of RabbitMQ 2. A brief overview of important RabbitMQ concepts 3. Spring Boot Integration RabbitMQ Preface RabbitMQ is a message queue that is used to asynchronize and decouple applications, as well as to buffer and distribute messages.The most impor ...

Preface DefaultListableBeanFactory is the last subclass of beanFactory system, the only operation class and the only implementation. DefaultListableBeanFactory inherits AbstractAutowireCapableBeanFactory and implements the ConfigurableListableBeanFactory interface. Interpreting variables allowBeanDefinitionOverriding variable allowBeanDefini ...

Spring boot integrates redis + spring cache for caching github source code: https://github.com/xivinChen/SpringBoot 1, Cache user 1. First, create the springboot redis cache module and copy the contents of the springboot restful API. 2. Modify the three-tier architecture, that is, add the service tier Add the service.UserService interface, ...