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 is the most common on the network for transmission 8Bit encoding of byte code, we can see RFC2045 ~ RFC2049, the above detailed specifications have MIME. Base64 encoding can be used to pass in the HTTP environment, the longer identifying information. For example, in Java Persistence Hibernate in the system to use the Base64 to be a long unique identifier (typically a 128-bit UUID) is encoded as a string for HTTP form and the parameters in the HTTP GET URL . In other applications, they often need to encode binary data to fit on the URL (including hidden form fields) in the form. At this point, the use of Base64 encoding is not only relatively brief, but also has non-readable, encoded data that will not be directly seen with the naked eye.