我有一封嵌入的 HTML 电子邮件,其中使用了
base64
编码图像。通过 Chrome 访问时,图像不会在 Gmail 中显示。但当通过邮件客户端(Mac 上的邮件应用程序)访问相同的邮件时,它工作正常。我已正确设置标题。有什么想法吗?
我的代码
<html>
<body>Hi
<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAREAAAALCAYAAABYrrnHAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAABANpVFh0WE1MOmNvbS5hZG9iZS54bXAAAAAAADw/eHBhY2tldCBiZWdpbj0i77u/IiBpZD0iVzVNME1wQ2VoaUh6cmVTek5UY3prYzlkIj8+IDx4OnhtcG1ldGEgeG1sbnM6eD0iYWRvYmU6bnM6bWV0YS8iIHg6eG1wdGs9IkFkb2JlIFhNUCBDb3JlIDUuNi1jMTM4IDc5LjE1OTgyNCwgMjAxNi8wOS8xNC0wMTowOTowMSAgICAgICAgIj4gPHJkZjpSREYgeG1sbnM6cmRmPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5LzAyLzIyLXJkZi1zeW50YXgtbnMjIj4gPHJkZjpEZXNjcmlwdGlvbiByZGY6YWJvdXQ9IiIgeG1sbnM6eG1wTU09Imh0dHA6Ly9ucy5hZG9iZS5jb20veGFwLzEuMC9tbS8iIHhtbG5zOnN0UmVmPSJodHRwOi8vbnMuYWRvYmUuY29tL3hhcC8xLjAvc1R5cGUvUmVzb3VyY2VSZWYjIiB4bWxuczp4bXA9Imh0dHA6Ly9ucy5hZG9iZS5jb20veGFwLzEuMC8iIHhtbG5zOmRjPSJodHRwOi8vcHVybC5vcmcvZGMvZWxlbWVudHMvMS4xLyIgeG1wTU06T3JpZ2luYWxEb2N1bWVudElEPSJ1dWlkOjVEMjA4OTI0OTNCRkRCMTE5MTRBODU5MEQzMTUwOEM4IiB4bXBNTTpEb2N1bWVudElEPSJ4bXAuZGlkOjVGMjU1MzZBQUVGQjExRTc5NUQyQTc1MzA0RERGMTVGIiB4bXBNTTpJbnN0YW5jZUlEPSJ4bXAuaWlkOjVGMjU1MzY5QUVGQjExRTc5NUQyQTc1MzA0RERGMTVGIiB4bXA6Q3JlYXRvclRvb2w9IkFkb2JlIElsbHVzdHJhdG9yIENDIDIwMTcgKE1hY2ludG9zaCkiPiA8eG1wTU06RGVyaXZlZEZyb20gc3RSZWY6aW5zdGFuY2VJRD0idXVpZDpiNDQ5NzVjYy00YmI1LTRmNzAtODRiZi0zMGU2NjFkYmY3ZDMiIHN0UmVmOmRvY3VtZW50SUQ9InhtcC5kaWQ6ZDc1MTVmZDQtMjkzZS00ZWI5LWFiMjQtOTMzYzRkZjNmOTY4Ii8+IDxkYzp0aXRsZT4gPHJkZjpBbHQ+IDxyZGY6bGkgeG1sOmxhbmc9IngtZGVmYXVsdCI+bXRrYV9hY3RpdmF0aW9uX2NhcmQ8L3JkZjpsaT4gPC9yZGY6QWx0PiA8L2RjOnRpdGxlPiA8L3JkZjpEZXNjcmlwdGlvbj4gPC9yZGY6UkRGPiA8L3g6eG1wbWV0YT4gPD94cGFja2V0IGVuZD0iciI/Pr6AOtYAAABESURBVHja7NZBDQAwCARB2tS/m6qoKIoGvswkGNjHhQgAAACAeVbdkwHoOnVXBqD9iWSmCkDblgAwIoARAYwIMNAXYACy9wSMWMVdzAAAAABJRU5ErkJggg==" width="273" height="11" alt="">
</body>
</html>
标题
Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: quoted-printable
base64 编码的图像在电子邮件中不受良好支持。 大多数网络电子邮件客户端(包括 Gmail)不支持它们,并且在 Outlook 中被完全阻止。 Apple Mail 是少数几个支持它们的客户端之一,这就是为什么您可以在那里看到它们,但在其他地方看不到它们。
<img src="http://www.website.com/image.png">
不计入电子邮件的文件大小,但使用 Base64 编码的图像do,并且可以快速使电子邮件的文件大小超过 102KB 限制。还有其他需要考虑的事情。
<img src="cid:123456">
- 更多详细信息这里
function convert() {
let base64 = imageBase64.value.split('base64,')[1];
let hex = [...atob(base64)].map(c => c.charCodeAt(0).toString(16).padStart(2, 0));
let img = 'data:image/png,%' + hex.join('%');
pic.src = img;
msg.innerText = img;
}
Put your img base64 data uri here<br>
<input style="width:200px" id='imageBase64' value="data:image/bmp;base64,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">
<button onclick="convert()">Convert</button><br> Result
<br>
<textarea id='msg' rows="4" cols="50"></textarea><br>
<img id='pic'>
在您的模板中,具有如下所示的图像标签。
<img src="cid:header-logo">
然后,在您的电子邮件逻辑中,将附件添加为内联。
helper.addInline("header-logo", new ClassPathResource("mail/images/header-logo.png"));