帮助从 Servlet 获取图像到 JSP 页面 [英] Help getting image from Servlet to JSP page

问题描述

我目前必须生成一个显示字符串文本的图像，我需要在 Servlet 上制作这个图像，然后以某种方式将图像传递给 JSP 页面，以便它可以显示它.我试图避免保存图像，而是以某种方式将图像流式传输到 JSP.

I currently have to generate an image that displays the text of a string, i need to make this image on a Servlet and then somehow pass the image to a JSP page so that it can display it. I'm trying to avoid saving the image, and instead somehow stream the image to the JSP.

自从我开始寻找如何将图像从 Servlet 传递到 JSP 之后，我还没有找到生成图像的方法，但卡住了.

I haven't found a way of generating the image since i started with finding how to pass an image from the Servlet to the JSP adn got stuck.

jsp 页面已经创建，不是由 servlet 创建的，我必须将图像传递到已经存在的 jsp 中

The jsp page is already made and isn't created by the servlet, i have to pass the image into an already existing jsp

感谢任何帮助.

推荐答案

您需要将图像作为字节数组写入响应的输出流.像这样:

You need to write the image as a byte array to the response's output stream. Something like this:

byte[] imageBytes = getImageAsBytes();

response.setContentType("image/jpeg");
response.setContentLength(imageBytes.length);

response.getOutputStream().write(imageBytes);

然后在您的 JSP 中您只需使用标准的 img 元素:

Then in you JSP you just use a standard img element:

<img src="url to your servlet">

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