zxing生成二维码
目前流行的三大国际标准
PDF417：不支持中文
DM：专利未公开，需支付专利费用
QR code：专利公开，支持中文
Quick Response Code
QR code比其他二维码相比，具有识读速度快，数据密度大，占用空间小的优势。
QR Code是有日本Demso公司于1994年研制的一种矩阵二维码符号码
纠错能力：
L级：约可纠错7%的数据码字
M级：约可纠错15%的数据码字
Q级：约可纠错25%的数据码字
H级：约可纠错30%的数据码字
纠错能力越高，存储的数据就越少
使用zxing生成二维码
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