生成图像并在JSP中显示它以及其他内容 [英] Generate image and display it inside JSP along with other content

问题描述

我正在使用JFreeChart根据用户输入生成动态图表。我有一个带有一些文本框和组合框的JSP，用户进行输入并提交它，并且Action处理它，生成图表的图像。我需要在与文本框/组合框下面相同的JSP上显示此图像。

I'm using JFreeChart to generate a dynamic chart depending on the user input. I have a JSP with some textbox and combobox, the user makes the input and submits it, and the Action process it, generating an image of a chart. I need to display this image on the same JSP as before, below the textbox/combobox.

如果我使用 response.setContentType（image / jpeg）; 等...然后我得到一个单独包含图像的页面。我想将图像保存到文件然后使用< img> 访问它，但我不确定它是否可行（需要将其保存到WebContent和我可能无法一直访问它？）。

If I use response.setContentType("image/jpeg"); etc... then I get a page with the image alone. I thought of saving the image to a file and then access it with <img >, but I'm not sure that will work (need to save it to WebContent and I may not be able to access it always?).

有没有办法以某种方式缓存图像，然后通过< img> 还是什么？也许JFreeChart有一个简单的方法来做我想做的事情？

Is there a way to somehow cache the image and then access it inside the JSP through an <img> or something? Maybe JFreeChart has an easy way to do what I want?

如果重要的话，我也在我的webapp上使用struts和spring。

If it matters, I'm also using struts and spring on my webapp.

提前致谢。

推荐答案

我没试过，但你可能会看一下< a href =http://www.jfree.org/jfreechart/api/javadoc/org/jfree/chart/imagemap/package-summary.html =nofollow noreferrer> org.jfree .chart.imagemap 以及来自 org.jfree.chart.urls 。 此处说明了实现 PieURLGenerator 的概要。

I've not tried it, but you might look into org.jfree.chart.imagemap and a suitable URL generator from org.jfree.chart.urls. An outline of implementing a PieURLGenerator is illustrated here.

这篇关于生成图像并在JSP中显示它以及其他内容的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！