I am using JFreeChart, and I want to implement tooltips using servlet/JSP
Code : servlet
doPost() {
XYDataset xyDataset = Chart.createDataset(chartType, getServletContext());
JFreeChart chart = Chart.createChart(xyDataset, chartType);
final ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());
final File file1 = new File("D:\\graph\\test.png");
ChartUtilities.saveChartAsPNG(file1, chart, 600, 400, info);
// write an HTML page incorporating the image with an image map
final File file2 = new File("D:\\graph\\multipiechart100.html");
final OutputStream out = new BufferedOutputStream(new FileOutputStream(file2));
final PrintWriter writer = new PrintWriter(out);
writer.println("<HTML>");
writer.println("<HEAD><TITLE>JFreeChart Image Map Demo</TITLE></HEAD>");
writer.println("<BODY>");
// ChartUtilities.writeImageMap(writer, "chart", info);
writer.println("<IMG SRC=\"multipiechart100.png\" "
+ "WIDTH=\"600\" HEIGHT=\"400\" BORDER=\"0\" USEMAP=\"#imageMap\">");
writer.println("</BODY>");
writer.println("</HTML>");
writer.close();
BufferedImage buf = chart.createBufferedImage(800, 450, info);
ChartUtilities.writeImageMap(writer, "imageMap", info, true);
// ChartUtilities.writeBufferedImageAsPNG(out,buf);
ChartUtilities.writeChartAsPNG(out, chart, 700, 250, info);
}
JSP :
<img alt="" id="monthchart" usemap="#imageMap"
src='<%=url+"/TimeChart/servlet/ChartServlet?CHARTTYPE="+ChartConstant.MONTH_CHART%>'></img>
But I am not getting any chart, and I get an error like this:
java.io.IOException: Write error
at java.io.FileOutputStream.writeBytes(Native Method)
at java.io.FileOutputStream.write(FileOutputStream.java:260)
at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:123)
at javax.imageio.stream.FileCacheImageOutputStream.close(FileCacheImageOutputStream.java:213)
at javax.imageio.ImageIO.write(ImageIO.java:1567)
at org.jfree.chart.encoders.SunPNGEncoderAdapter.encode(SunPNGEncoderAdapter.java:127)
at org.jfree.chart.encoders.EncoderUtil.writeBufferedImage(EncoderUtil.java:134)
at org.jfree.chart.ChartUtilities.writeChartAsPNG(ChartUtilities.java:185)
at com.chart.ChartServlet.doPost(ChartServlet.java:138)
at com.chart.ChartServlet.doGet(ChartServlet.java:60)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:291)
at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:877)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:594)
at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1675)
at java.lang.Thread.run(Thread.java:619)
