为其他用户更新我的解决方案:

Updating my solution for other users:

我找到了jsPDF的.output('datauristring')方法，该方法返回了BASE64字符串.

I found the .output('datauristring') method of the jsPDF which returns me a BASE64 String.

然后将字符串通过JSON发送到我支持的bean，并按照我的意愿进行转换.

Then the String is sent via JSON to my backed bean and converted as my will.