将画布的内容发送到Java服务器并将其保存为图像 [英] Sending the contents of a canvas to a Java server and saving it as an image

问题描述

好吧，基本上我已经开发了一个简单的图像上传系统。用户选择本地图像（使用HTML5文件/ FileReader API），并且能够在确认结果之前裁剪它。

最终结果在画布中查看所以将其发送到服务器我使用toDataURL。后端服务器是一个NodeJS服务器，然后需要对Java服务器进行REST调用，该服务器将根据数据创建一个映像文件并将其保存到磁盘。

toDataURL的结果是以下形式：data：image / png; base64，ENCODED DATA。

我需要在Java服务器上将字符串转换为正确的二进制 c

;

$ c>部分并基本64解码其余部分。

Okay, basically I've developed a simple image upload system. The user selects a local image (using the HTML5 File / FileReader API) and has the ability to crop it before confirming the result.

The final result is viewed in a canvas so to send it to the server I'm using toDataURL. The backend server is a NodeJS server which then needs to make a REST call to a Java server which will create an image file from the data and save it to disk.

The results of toDataURL are in the form: data:image/png;base64, ENCODED DATA.

What would I need on the Java server to convert the string into it's proper binary representation?

解决方案

You need to remove the data:image/png;base64, part and base 64 decode the rest.

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