Base64是网络上最常见的用于传输8Bit字节代码的编码方式之一，大家可以查看RFC2045～RFC2049，上面有MIME的详细规范。Base64编码可用于在HTTP环境下传递较长的标识信息。再次运用java语言实现加密/解密、base64与图片互相转化。(Base64 is one of the most common coding methods used to transmit 8Bit byte code on the network. We can check RFC2045 ~ RFC2049, and there is a detailed specification of MIME. Base64 encoding can be used to deliver longer identification information in a HTTP environment. Thirdly, Java language is used to encrypt / decrypt, and Base64 and pictures are transformed into each other.)