问题描述

jsp 中用jfreechart 运行出错 求大神解答 或求折线例子

代码如下

     DefaultCategoryDataset linedataset = new DefaultCategoryDataset();//  各曲线名称String series1 = ""订单量与时间"";String series2 = ""发生金额与时间"";    //  DefaultCategoryDataset dataset = new DefaultCategoryDataset();     while(rs.next()){  //   dataset.addValue(rs.getInt(2)rs.getDate(1) "");  linedataset.addValue(rs.getInt(2) series1 rs.getDate(1));   linedataset.addValue(rs.getInt(3) series2 rs.getDate(1));     num=num+rs.getInt(2);     money=money+rs.getFloat(3);    %>     <tr>    <td width=45% align=""center""><%out.print(rs.getDate(1));%></td>    <td width=30% align=""center""><%out.print(rs.getInt(2));%></td>    <td width=30% align=""center""><%out.print(rs.getFloat(3));%></td>        </tr>      <%    }    //定义图表对象JFreeChart chart = ChartFactory.createLineChart(""""""linedatasetPlotOrientation.VERTICALfalsefalsefalse);CategoryPlot plot = chart.getCategoryPlot();/*字体乱码异常解决代码*/chart.getTitle().setFont(new Font(""宋体"" Font.BOLD 15));   chart.getLegend().setItemFont(new Font(""黑体"" Font.BOLD 15));   CategoryAxis domainAxis = plot.getDomainAxis();      /*------设置X轴坐标上的文字-----------*/    domainAxis.setTickLabelFont(new Font(""黑体"" Font.PLAIN 11));      /*------设置X轴的标题文字------------*/    domainAxis.setLabelFont(new Font(""宋体"" Font.PLAIN 12));      NumberAxis numberaxis = (NumberAxis) plot.getRangeAxis();      /*------设置Y轴坐标上的文字-----------*/    numberaxis.setTickLabelFont(new Font(""黑体"" Font.PLAIN 12));      /*------设置Y轴的标题文字------------*/    numberaxis.setLabelFont(new Font(""黑体"" Font.PLAIN 12));/*字体乱码异常解决代码*/  // 各种属性设置...NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());rangeAxis.setAutoRangeIncludesZero(true);rangeAxis.setUpperMargin(0.20);rangeAxis.setLabelAngle(Math.PI / 2.0); //String filename = ServletUtilities.saveChartAsPNG(chart 500 300 null session);String graphURL = request.getContextPath() + ""/DisplayChart?filename="" + filename;

 HTTP Status 500 -type Exception reportmessagedescription The server encountered an internal error () that prevented it from fulfilling this request.exceptionorg.apache.jasper.JasperException: Unable to compile class for JSP: An error occurred at line: 113 in the jsp file: /dingdanjieguo.jspThe method createLineChart(String String String CategoryDataset PlotOrientation boolean boolean boolean) in the type ChartFactory is not applicable for the arguments (String String String DefaultCategoryDataset PlotOrientation boolean boolean boolean)110:    <% 111:    } 112:    //瀹氫箟鍥捐〃瀵硅薄113: JFreeChart chart = ChartFactory.createLineChart(""""""linedatasetPlotOrientation.VERTICALfalsefalsefalse);114: CategoryPlot plot = chart.getCategoryPlot();115: /*瀛椾綋涔辩爜寮傚父瑙ｅ喅浠ｇ爜*/116: chart.getTitle().setFont(new Font(""瀹嬩綋"" Font.BOLD 15));An error occurred at line: 117 in the jsp file: /dingdanjieguo.jspThe method setItemFont(Font) is undefined for the type Legend114: CategoryPlot plot = chart.getCategoryPlot();115: /*瀛椾綋涔辩爜寮傚父瑙ｅ喅浠ｇ爜*/116: chart.getTitle().setFont(new Font(""瀹嬩綋"" Font.BOLD 15));117:    chart.getLegend().setItemFont(new Font(""榛戜綋"" Font.BOLD 15));118:    CategoryAxis domainAxis = plot.getDomainAxis();   119:    /*------璁剧疆X杞村潗鏍囦笂鐨勬枃瀛?----------*/ 120:    domainAxis.setTickLabelFont(new Font(""榛戜綋"" Font.PLAIN 11));   Stacktrace:    org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:92)    org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:330)    org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:423)    org.apache.jasper.compiler.Compiler.compile(Compiler.java:308)    org.apache.jasper.compiler.Compiler.compile(Compiler.java:286)    org.apache.jasper.compiler.Compiler.compile(Compiler.java:273)    org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:566)    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)    javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

解决方案

是你的Jasper Report的编译不通过，检查一个report的内容与格式，还有数据源等。