Okhttp3 implements crawling verification code and an example of obtaining cookies

At present, I am working on my graduation project, an app about campus services. I will extract the completed relevant code and write it in the article. One is to benefit the community that has helped me. The other is to consolidate the memory of relevant knowledge while writing articles.

1、 Foreword

In the process of crawling the educational administration system, obtaining the verification code is very important: while generating the picture of the verification code, the server will return a cookie, which needs to be brought with all subsequent requests.

2、 Preparation before use

2.1 introduction

Okhttp is a fast and efficient network request library. For details, please refer to the official documents

2.2 Android studio configuration gradle

2.3 add networking permission in Android manifest

3、 Get verification code and cookie

After successfully obtaining the verification code, notify the UI through the handler to update the picture of the verification code

summary

Through this simple code, you have completed the crawling of verification codes and cookies, right? Okhttp is really a very powerful network request library. In the next chapter, I will introduce how to crawl the achievements of the educational administration system.

The above is the whole content of this article. I hope it will be helpful to your study, and I hope you can support programming tips.