Springboot integrates Zxing to generate QR code

Foreword:

Requirement description: The user knows the link address, but does not want to click on the link, and wants to access the designated website by scanning the code; then the user only gives me a url address and let me generate a QR code for him!

Understanding of Zxing:
　　ZXing, a library that supports decoding and generating barcodes (such as QR codes, PDF 417, EAN, UPC, Aztec, Data Matrix, Codabar) in images. ZXing ("zebra crossing") is an open source, multi-format, 1D/2D barcode image processing library implemented in Java, with ports to other languages.

First look at the implementation effect:

Code implementation process:

1. Introduce Google's zxing dependency

    <!--引入生成二维码的依赖-->
        <!-- https://mvnrepository.com/artifact/com.google.zxing/core -->
        <dependency>