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To add log4j to the existing engineering code and record the log information without destroying the original code structure, we need to download the package on the official website first. I downloaded apache-log4j-2.12.0-bin, download address: https://logging.apache.org/log4j/2.x/download.html 1. Fi ...

spring AOP - Implemented by Annotation Catalog Explain Configure applicationContext.xml Face class MyAspect.java Custom Annotation @Method summary Catalog Explain This example is not a web project. Configure applicationContext.xml Configuration file, code slice. <?xml version="1.0" enco ...

Above address: Spring Security OAuth 2 (1) (password,authorization_code,refresh_token,client_credentials) gets token The last blog wrote a simple token authentication server of OAuth2, which only implements four ways to acquire token. It does not deal with exception handling, unauthorized handling, data integrity checking before token generatio ...

Requirements: Files and folders under the specified path are filtered out and packaged for download. Note: The mvc structure of php can be downloaded by adding header header to the controller, but this method can not be used if the front-end Ajax request interface is used, because both json data and ...

I. THE CONCEPT OF POLYMORPHISM 1. What is polymorphism? A thing has a variety of forms, that is, to face the various states of the object. Official Interpretation: Multiple different classes of objects can respond to the same method and produce different results It is emphasized that polymorphism is not a special grammar, but a state and ch ...

polymorphic Concept: A thing has many different forms. For example, water is solid and gaseous. Bumblebee: Autobots, Cars, Airplanes Official Interpretation: Multiple different classes of objects can respond to the same method and produce different results First of all, it is emphasized that polymorphism is not a special grammar, but a state, a ...

Preface In this article, we will discuss the JWT VS Session. This problem is not too much to think about. When we see that comments and discussions are too heated, we spend a little time to research and summarize. By the way, this is the benefit of blogging. A blog may write with accumulated experience, or it may be learning to share, but it a ...

In order to better query the relevant information of enterprises, I crawled the enterprises in Anhui Province. The problems encountered and the technologies used are as follows: 1. Problems encountered: 1 > Enterprise Check PC version data only shows the first 500 pages. In order to maximize the crawl site data, this crawl is crawled accor ...

Brief introduction Routing plays a very important role in component engineering. How do two module s communicate without mutual reference? We can use EventBus, broadcast, class loading, reflection, scheme, implicit intention and so on. Each of these methods has its own advantages and disadvantages. In ...

1. Write in front As an active developer in Beijing, Tianjin and Hebei, we should take a look at some data of Shijiazhuang, an international metropolis. This blog crawls the rental information of Chain Home. The data can be used as data analysis material in the following blog. The website we need to c ...