使用jfreechart在weblogic下运行的问题

Question

你需要看一下org.jfree.chart.encoders.KeypointPNGEncoderAdapter这个代码

Answer 1

程序的相关代码如下：
请大家帮忙！这是我用java写的生成chart的类：
package com.huiton.SCM.logis.inv;import java.awt.*;
import java.util.TimeZone;
import org.jfree.chart.*;
import org.jfree.chart.axis.PeriodAxis;
import org.jfree.chart.axis.PeriodAxisLabelInfo;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.StandardXYItemRenderer;
import org.jfree.data.time.*;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.*;
import org.jfree.chart.entity.StandardEntityCollection;
import org.jfree.chart.servlet.ServletUtilities;
import javax.servlet.http.HttpSession;
import java.io.PrintWriter;
import java.awt.Font;
import org.jfree.chart.title.TextTitle;public class PeriodXYChart {
  protected  String filename="";
   protected  String title="";
  protected  int chartHight=0;
  protected  int chartWidth=0;  public PeriodXYChart(String title,int chartWidth,int chartHight) {
    this.chartHight=chartHight;
    this.chartWidth=chartWidth;
    this.title=title;
  }
   public String generateXYChart(HttpSession session, PrintWriter pw,XYDataset xydataset)
{
  try
  {
    JFreeChart jfreechart=PeriodXYChart.createChart(title,xydataset);
     System.out.println("--------------- create jfreechart---------");
    ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());
    filename = ServletUtilities.saveChartAsPNG(jfreechart, chartWidth, chartHight, info, session);
    //把image map 写入到 PrintWriter
    ChartUtilities.writeImageMap(pw, filename, info);
            pw.flush();
  }
  catch(Exception ex)
  {
    System.out.println("error:" + ex.getMessage());  }
  return  filename;
}   static JFreeChart createChart(String title,XYDataset xydataset)
    {
        Font font;
        JFreeChart jfreechart = ChartFactory.createTimeSeriesChart(title, "日期", "零件用量", xydataset, true, true, false);
        jfreechart.setBackgroundPaint(Color.white);
        jfreechart.setTitle(new TextTitle(title, new Font("黑体", Font.BOLD, 17), Color.black));        StandardLegend standardlegend = (StandardLegend)jfreechart.getLegend();
        standardlegend.setDisplaySeriesShapes(true);
        XYPlot xyplot = jfreechart.getXYPlot();
        font = new Font("黑体", Font.CENTER_BASELINE, 20);
        xyplot.setBackgroundPaint(Color.white);
        xyplot.setDomainGridlinePaint(Color.lightGray);
        xyplot.setRangeGridlinePaint(Color.lightGray);
        xyplot.setAxisOffset(new Spacer(1, 5D, 5D, 5D, 5D));
        xyplot.setDomainCrosshairVisible(true);
        xyplot.setRangeCrosshairVisible(true);
        org.jfree.chart.renderer.xy.XYItemRenderer xyitemrenderer = xyplot.getRenderer();
        if(xyitemrenderer instanceof StandardXYItemRenderer)
        {
            StandardXYItemRenderer standardxyitemrenderer = (StandardXYItemRenderer)xyitemrenderer;
            standardxyitemrenderer.setPlotShapes(true);
            standardxyitemrenderer.setShapesFilled(true);
            standardxyitemrenderer.setItemLabelsVisible(true);
        }
        PeriodAxis periodaxis = new PeriodAxis("日期");
        periodaxis.setTimeZone(TimeZone.getDefault());
        periodaxis.setAutoRangeTimePeriodClass(org.jfree.data.time.Day.class);
        periodaxis.setLabelFont(new Font("黑体", Font.BOLD, 15));
        PeriodAxisLabelInfo aperiodaxislabelinfo[] = new PeriodAxisLabelInfo[3];
        aperiodaxislabelinfo[0] = new PeriodAxisLabelInfo(org.jfree.data.time.Day.class, "d");
        aperiodaxislabelinfo[1] = new PeriodAxisLabelInfo(org.jfree.data.time.Month.class, "MMM", new Spacer(1, 2D, 2D, 2D, 2D), new Font("黑体", 1, 10), Color.black, false, null, null);
        aperiodaxislabelinfo[2] = new PeriodAxisLabelInfo(org.jfree.data.time.Year.class, "yyyy");
        periodaxis.setLabelInfo(aperiodaxislabelinfo);
        xyplot.setDomainAxis(periodaxis);
        return jfreechart;
    }
}
下面在jsp网页中调用该类画图：
其中，timeseriescollection在另外一个文件中生成，传到jsp页面
下面是include进去的画图页面<%@ page contentType="text/html;charset=GBK"%>
<%@page import="com.huiton.SCM.pub.util.functions.*"%>
<%@page import="com.huiton.SCM.logis.inv.PeriodXYChart"%>
<%@ page contentType="text/html;charset=gb2312"%><%@ page import = "java.io.PrintWriter" %>
<%@ page import = "java.text.SimpleDateFormat" %>
<%@ page import = "java.text.ParseException" %>
       <% 
      
       PeriodXYChart XYChart=new PeriodXYChart("零件用量统计图",500,300);
       String filename=XYChart.generateXYChart(session,new PrintWriter(out),timeseriescollection);
        //System.out.println("22222222222222222222222");
       String graphURL = request.getContextPath() + "/servlet/DisplayChart?filename=" + filename;    
       
%>
<script language="javascript">function closeMe()
{
self.close();
}</script><table>
<tr>
<td>
<img src="<%= graphURL %>" width=500 height=300 border=0 usemap="#<%= filename %>"> 
       </body>
       </html>
</td>
</tr><tr></tr></table>