jfreeChart生成图片的保存

最新推荐文章于 2022-06-30 16:37:24 发布

aijun1982

最新推荐文章于 2022-06-30 16:37:24 发布

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分类专栏： java 文章标签： jfreechart Java Tomcat Apache C

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跟踪一下源代码:

程序代码

String filename=ServletUtilities.saveChartAsJPEG(chart1,600,400,session);

    public static String saveChartAsJPEG(JFreeChart chart, int width,
            int height, ChartRenderingInfo info, HttpSession session)
            throws IOException {

        if (chart == null) {
            throw new IllegalArgumentException("Null 'chart' argument.");
        }

        ServletUtilities.createTempDir();
        String prefix = ServletUtilities.tempFilePrefix;
        if (session == null) {
            prefix = ServletUtilities.tempOneTimeFilePrefix;
        }
        File tempFile = File.createTempFile(prefix, ".jpeg",
                new File(System.getProperty("java.io.tmpdir")));
        ChartUtilities.saveChartAsJPEG(tempFile, chart, width, height, info);
        if (session != null) {
            ServletUtilities.registerChartForDeletion(tempFile, session);
        }
        return tempFile.getName();

    }

System.getProperty("java.io.tmpdir")得到的路径为:
C:\Program Files\Apache Software Foundation\Tomcat 6.0\temp