网站域名 空间 是每年都要缴费吗,做刀模线网站,长白山开发建设集团网站,网站建设维护公司资质Highcharts是一个用纯JavaScript编写的图表库#xff0c;提供了一个交互式的图表添加到您的网站或Web应用程序的简单方法。Highcharts目前支持线#xff0c;样条#xff0c;面积#xff0c;areaspline#xff0c;柱形图#xff0c;条形图#xff0c;饼图和散点图类型。同…Highcharts是一个用纯JavaScript编写的图表库提供了一个交互式的图表添加到您的网站或Web应用程序的简单方法。Highcharts目前支持线样条面积areaspline柱形图条形图饼图和散点图类型。同时Highcharts提供将图表导出为图片或者PDF格式文件只需要在页面中载入exporting.js文件。由于生成的图表是SVG格式所以导出时需要将数据发送到服务器端来进行转换。在exporting.js中默认导出地址是http://export.highcharts.com/另外在demo中也提供了php版本。本文是介绍如何在java web application中来实现导出功能。首选需要在lib中加入batik jar包如果是使用maven来管理项目则在库中只能找到1.6的版本同时需要另外下载一个包(xml-apis-ext.jar)。public class ExportHighFreqChartServlet extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {public ExportHighFreqChartServlet() {super();}protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {doPost(request, response);}protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServerException, IOException {String type request.getParameter(type);String svg request.getParameter(svg);String filename request.getParameter(filename);filename filenamenull?chart:filename;ServletOutputStream out response.getOutputStream();if (null ! type null ! svg) {svg svg.replaceAll(:rect, rect);String ext ;Transcoder t null;if (type.equals(image/png)) {ext png;t new PNGTranscoder();} else if (type.equals(image/jpeg)) {ext jpg;t new JPEGTranscoder();} else if (type.equals(application/pdf)) {ext pdf;t new PDFTranscoder();}response.addHeader(Content-Disposition, attachment; filename filename .ext);response.addHeader(Content-Type, type);if (null ! t) {TranscoderInput input new TranscoderInput(new StringReader(svg));TranscoderOutput output new TranscoderOutput(out);try {t.transcode(input, output);} catch (TranscoderException e) {out.print(Problem transcoding stream. See the web logs for more details.);e.printStackTrace();}} else if (ext.equals(svg)) {out.print(svg);} else {out.print(Invalid type: type);}} else {response.addHeader(Content-Type, text/html);out.println(Usage:\n\tParameter [svg]: The DOM Element to be converted.\n\tParameter [type]: The destination MIME type for the elment to be transcoded.);}out.flush();out.close();}}
