如何在jsp页面中显示饼图？ [英] How can i display pie chart in jsp page?
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问题描述
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<%@ page import="java.awt.*"%>
<%@ page import="java.io.*"%>
<%@ page import="org.jfree.chart.*"%>
<%@ page import="org.jfree.chart.entity.*"%>
<%@ page import="org.jfree.data.general.*"%>
<%
DefaultPieDataset pieDataset = new DefaultPieDataset();
pieDataset.setValue("JavaWorld", new Integer(75));
pieDataset.setValue("Other", new Integer(25));
JFreeChart chart = ChartFactory.createPieChart("Sample Pie Chart",pieDataset,true,true,false);
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Pie Chart</title>
</head>
<body>
<IMG SRC="piechart.png" WIDTH="600" HEIGHT="400" BORDER="0"
USEMAP="#chart">
</body>
</html>
此输出为空白屏幕，不会抛出任何异常..
Output for this is a blank screen, It not thrown any exception..
如何在此页面中显示饼图？
How can i display pie chart in this page?
提前致谢。
推荐答案
最后我得到了答案....
Finally i got the answer....
.....在servlet ....
.....In servlet....
public void getPieChart() {
DefaultPieDataset pieDataset = new DefaultPieDataset();
pieDataset.setValue("JavaWorld", new Integer(75));
pieDataset.setValue("Other", new Integer(25));
JFreeChart chart = ChartFactory.createPieChart("Discounts Used by Category ", data, true, true, false);
//chart.setBackgroundPaint(new Color(222, 222, 255));
final PiePlot plot = (PiePlot) chart.getPlot();
plot.setBackgroundPaint(Color.white);
plot.setCircular(true);
try {
final ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());
final File file1 = new File(getServletContext().getRealPath(".") + "/images/charts/piechart.png");
ChartUtilities.saveChartAsPNG(file1, chart, 600, 400, info);
} catch (Exception e) {
System.out.println(e);
}
}
..... in html页面......
.....in html page......
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Pie Chart</title>
</head>
<body>
<IMG SRC="piechart.png" WIDTH="600" HEIGHT="400" BORDER="0"
USEMAP="#chart">
</body>
</html>
..................... .................................................. .....
............................................................................
......................或仅使用jsp页面... .....
......................Or using only jsp page........
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<%@ page import="java.awt.*"%>
<%@ page import="java.io.*"%>
<%@ page import="org.jfree.chart.*"%>
<%@ page import="org.jfree.chart.entity.*"%>
<%@ page import="org.jfree.data.general.*"%>
<%
DefaultPieDataset pieDataset = new DefaultPieDataset();
pieDataset.setValue("JavaWorld", new Integer(75));
pieDataset.setValue("Other", new Integer(25));
JFreeChart chart = ChartFactory.createPieChart("Discounts Used by Category ", data, true, true, false);
//chart.setBackgroundPaint(new Color(222, 222, 255));
final PiePlot plot = (PiePlot) chart.getPlot();
plot.setBackgroundPaint(Color.white);
plot.setCircular(true);
try {
final ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());
final File file1 = new File(getServletContext().getRealPath(".") + "/images/charts/piechart.png");
ChartUtilities.saveChartAsPNG(file1, chart, 600, 400, info);
} catch (Exception e) {
System.out.println(e);
}
}
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Pie Chart</title>
</head>
<body>
<IMG SRC="piechart.png" WIDTH="600" HEIGHT="400" BORDER="0"
USEMAP="#chart">
</body>
</html>
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