java下编写QRCode源程序，有二维码生成方法、解读方法及测试demo，不需修改，可直接运行。,java source QRCode prepared, there are two-dimensional code generation method, reading method and test demo, no changes can be directly run.

java程序生成qrcode，二维编码图片-java program to generate qrcode, two-dimensional coding pictures