在bean中
public static String generatePieChart( HttpSession session, PrintWriter pw)
{
String filename = null;
Font font;
String title="发撒撒撒播";
try {
// 建立PieDataSet
DefaultPieDataset data = new DefaultPieDataset();
data.setValue("发包", 60);
data.setValue("usa", 10);
data.setValue("japan", 30); JFreeChart chart = ChartFactory.createPieChart(
title,
data,
true,
true,
false);
// 生成chart物件
PiePlot plot = new PiePlot(data);
plot.setToolTipGenerator(new StandardPieToolTipGenerator());
font=new Font("黑体",Font.CENTER_BASELINE,20);//这个地方是设置统计图标题的字体和大小
TextTitle tt=new TextTitle(title);
tt.setFont(font);
chart.setBackgroundPaint(java.awt.Color.white);//统计图片的底色
chart.setTitle(tt);
// 把生成的文件写入到临时的目录中
ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());
filename = ServletUtilities.saveChartAsPNG(chart, 500, 300,info, session);
//选择存储成png格式的文件,当然你也可以使用saveChartAsJPEG的方法生成jpg图片
// 把image map 写入到 PrintWriter
ChartUtilities.writeImageMap(pw, filename, info, false);
System.out.println("已完成图生成,filename=" + filename);
System.out.println(info);
System.out.println(pw);
pw.flush();
}
catch (Exception ex) {
System.out.println("error:"+ex.getMessage());
}
return filename;
}
}在jsp中
<%
String filename = Test.generatePieChart(session, new PrintWriter(out));
out.println(filename);
String graphURL = request.getContextPath() + "/servlet/DisplayChart?filename=" + filename;
out.println(graphURL);
%>
<img src="<%=graphURL%>" width=500 height=300 border=0 usemap="#<%= filename %>"></div></td>我写的对吗??为什么什么也不显示亚???
public static String generatePieChart( HttpSession session, PrintWriter pw)
{
String filename = null;
Font font;
String title="发撒撒撒播";
try {
// 建立PieDataSet
DefaultPieDataset data = new DefaultPieDataset();
data.setValue("发包", 60);
data.setValue("usa", 10);
data.setValue("japan", 30); JFreeChart chart = ChartFactory.createPieChart(
title,
data,
true,
true,
false);
// 生成chart物件
PiePlot plot = new PiePlot(data);
plot.setToolTipGenerator(new StandardPieToolTipGenerator());
font=new Font("黑体",Font.CENTER_BASELINE,20);//这个地方是设置统计图标题的字体和大小
TextTitle tt=new TextTitle(title);
tt.setFont(font);
chart.setBackgroundPaint(java.awt.Color.white);//统计图片的底色
chart.setTitle(tt);
// 把生成的文件写入到临时的目录中
ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());
filename = ServletUtilities.saveChartAsPNG(chart, 500, 300,info, session);
//选择存储成png格式的文件,当然你也可以使用saveChartAsJPEG的方法生成jpg图片
// 把image map 写入到 PrintWriter
ChartUtilities.writeImageMap(pw, filename, info, false);
System.out.println("已完成图生成,filename=" + filename);
System.out.println(info);
System.out.println(pw);
pw.flush();
}
catch (Exception ex) {
System.out.println("error:"+ex.getMessage());
}
return filename;
}
}在jsp中
<%
String filename = Test.generatePieChart(session, new PrintWriter(out));
out.println(filename);
String graphURL = request.getContextPath() + "/servlet/DisplayChart?filename=" + filename;
out.println(graphURL);
%>
<img src="<%=graphURL%>" width=500 height=300 border=0 usemap="#<%= filename %>"></div></td>我写的对吗??为什么什么也不显示亚???
代码:
ChartUtilities.writeChartAsJPEG(response.getOutputStream(), 1f, chart, IMGWIDTH, IMGHEIGHT, null);
代码:
ChartUtilities.writeChartAsJPEG(response.getOutputStream(), 1f, chart, IMGWIDTH, IMGHEIGHT, null);