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这个例子是我参考JFreeChart Developer Guide做的.用Google搜一下,可以下载到.
1.Tomcat的安装不描述.现在假如Tomcat 安装目录为C:Tomcat 5.0,新建C: Tomcat 5.0 webapps myServlets目录.
安装JDK 安装目录C:j2sdk1.4.2_09 并将C:j2sdk1.4.2_09libjfreechart-1.0.0-rc1.jar加到CLASSPATH中.
3.新建index.html 放到C: Tomcat 5.0 webapps myServlets下
<HTML> <HEADER> <TITLE>JFreeChart 简单的例子</TITLE> </HEADER> <BODY> <H2>JFreeChart: 简单的例子</H2> <P> 下面有两个简单的例子,调用servlet,生成统计图. <ul> <li>条形统计图<a href="servlet/ServletDemo1">条形统计图</a>;</li> <li>可以选择统计图类型 <a href="chart.html">三种类型</a>. </li> </ul> </BODY> </HTML>
4.新建Chart.html 放到C: Tomcat 5.0 webapps myServlets下
<HTML> <HEADER> <TITLE>JFreeChart Servlet Demo 2</TITLE> </HEADER> <BODY> <H2>JFreeChart Servlet Demo</H2> <P> Please choose a chart type: <FORM ACTION="servlet/ServletDemo2" METHOD=POST> <INPUT TYPE="radio" NAME="chart" VALUE="pie" CHECKED> Pie Chart <INPUT TYPE="radio" NAME="chart" VALUE="bar"> Bar Chart <INPUT TYPE="radio" NAME="chart" VALUE="time"> Time Series Chart <P> <INPUT TYPE="submit" VALUE="Generate Chart"> </FORM> </BODY> </HTML>
5.新建ServletDemo1.java 并用JDK编译成class 文件,当然要将C: j2sdk1.4.2_09 lib jfreechart-1.0.0-rc1.jar加到CLASSPATH中,才能正确编译.
package com.jrefinery.chart.demo;
import java.io.IOException;
import java.io.OutputStream;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.category.DefaultCategoryDataset;
public class ServletDemo1 extends HttpServlet {
public ServletDemo1() {
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
OutputStream out = response.getOutputStream();
try {
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
dataset.addValue(10.0, "S1", "C1");
dataset.addValue(4.0, "S1", "C2");
dataset.addValue(15.0, "S1", "C3");
dataset.addValue(14.0, "S1", "C4");
dataset.addValue(-5.0, "S2", "C1");
dataset.addValue(-7.0, "S2", "C2");
dataset.addValue(14.0, "S2", "C3");
dataset.addValue(-3.0, "S2", "C4");
dataset.addValue(6.0, "S3", "C1");
dataset.addValue(17.0, "S3", "C2");
dataset.addValue(-12.0, "S3", "C3");
dataset.addValue( 7.0, "S3", "C4");
dataset.addValue(7.0, "S4", "C1");
dataset.addValue(15.0, "S4", "C2");
dataset.addValue(11.0, "S4", "C3");
dataset.addValue(0.0, "S4", "C4");
dataset.addValue(-8.0, "S5", "C1");
dataset.addValue(-6.0, "S5", "C2");
dataset.addValue(10.0, "S5", "C3");
dataset.addValue(-9.0, "S5", "C4");
dataset.addValue(9.0, "S6", "C1");
dataset.addValue(8.0, "S6", "C2");
dataset.addValue(null, "S6", "C3");
dataset.addValue(6.0, "S6", "C4");
dataset.addValue(-10.0, "S7", "C1");
dataset.addValue(9.0, "S7", "C2");
dataset.addValue(7.0, "S7", "C3");
dataset.addValue(7.0, "S7", "C4");
dataset.addValue(11.0, "S8", "C1");
dataset.addValue(13.0, "S8", "C2");
dataset.addValue(9.0, "S8", "C3");
dataset.addValue(9.0, "S8", "C4");
dataset.addValue(-3.0, "S9", "C1");
dataset.addValue(7.0, "S9", "C2");
dataset.addValue(11.0, "S9", "C3");
dataset.addValue(-10.0, "S9", "C4");
JFreeChart chart = ChartFactory.createBarChart(
"Bar Chart",
"Category",
"Value",
dataset,
PlotOrientation.VERTICAL,
true, true, false
);
response.setContentType("image/png");
ChartUtilities.writeChartAsPNG(out, chart, 400, 300);
}
catch (Exception e) {
System.err.println(e.toString());
}
finally {
out.close();
}
}
}
6.新建ServletDemo2 .java 并用JDK编译
package com.jrefinery.chart.demo; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class ServletDemo2 extends HttpServlet { public ServletDemo2() { } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { PrintWriter out = new PrintWriter(response.getWriter()); try { String param = request.getParameter("chart"); response.setContentType("text/html"); out.println("<HTML>"); out.println("<HEAD>"); out.println("<TITLE>JFreeChart Servlet Demo 2</TITLE>"); out.println("</HEAD>"); out.println("<BODY>"); out.println("<H2>JFreeChart Servlet Demo</H2>"); out.println("<P>"); out.println("Please choose a chart type:"); out.println("<FORM ACTION="ServletDemo2" METHOD=POST>"); String pieChecked = (param.equals("pie") ? " CHECKED" : ""); String barChecked = (param.equals("bar") ? " CHECKED" : ""); String timeChecked = (param.equals("time") ? " CHECKED" : ""); out.println("<INPUT TYPE="radio" NAME="chart" VALUE="pie""+ pieChecked + "> Pie Chart"); out.println("<INPUT TYPE="radio" NAME="chart" VALUE="bar""+ barChecked + "> Bar Chart"); out.println("<INPUT TYPE="radio" NAME="chart" VALUE="time""+ timeChecked + "> Time Series Chart"); out.println("<P>"); out.println("<INPUT TYPE="submit" VALUE="Generate Chart">"); out.println("</FORM>"); out.println("<P>"); out.println("<IMG SRC="ServletDemo2ChartGenerator?type="+ param + "" BORDER=1 WIDTH=800 HEIGHT=600/>"); out.println("</BODY>"); out.println("</HTML>"); out.flush(); out.close(); } catch (Exception e) { System.err.println(e.toString()); } finally { out.close(); } } }
7.新建ServletDemo2ChartGenerator .java 并用JDK编译.
package com.jrefinery.chart.demo;
import java.io.IOException;
import java.io.OutputStream;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.data.xy.*;
import org.jfree.data.general.*;
import org.jfree.data.time.*;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.category.DefaultCategoryDataset;
public class ServletDemo2ChartGenerator extends HttpServlet {
public ServletDemo2ChartGenerator() {
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
OutputStream out = response.getOutputStream();
try {
String type = request.getParameter("type");
JFreeChart chart = null;
if (type.equals("pie")) {
chart = createPieChart();
}
else if (type.equals("bar")) {
chart = createBarChart();
}
else if (type.equals("time")) {
chart = createTimeSeriesChart();
}
if (chart != null) {
response.setContentType("image/png");
ChartUtilities.writeChartAsPNG(out, chart, 800, 600);
}
}
catch (Exception e) {
System.err.println(e.toString());
}
finally {
out.close();
}
}
private JFreeChart createPieChart() {
// create a dataset...
DefaultPieDataset data = new DefaultPieDataset();
data.setValue("One", new Double(43.2));
data.setValue("Two", new Double(10.0));
data.setValue("Three", new Double(27.5));
data.setValue("Four", new Double(17.5));
data.setValue("Five", new Double(11.0));
data.setValue("Six", new Double(19.4));
JFreeChart chart = ChartFactory.createPieChart(
"Pie Chart",
data,
true, true, false
);
return chart;
}
private JFreeChart createBarChart() {
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
dataset.addValue(10.0, "S1", "C1");
dataset.addValue(4.0, "S1", "C2");
dataset.addValue(15.0, "S1", "C3");
dataset.addValue(14.0, "S1", "C4");
dataset.addValue(-5.0, "S2", "C1");
dataset.addValue(-7.0, "S2", "C2");
dataset.addValue(14.0, "S2", "C3");
dataset.addValue(-3.0, "S2", "C4");
dataset.addValue(6.0, "S3", "C1");
dataset.addValue(17.0, "S3", "C2");
dataset.addValue(-12.0, "S3", "C3");
dataset.addValue( 7.0, "S3", "C4");
dataset.addValue(7.0, "S4", "C1");
dataset.addValue(15.0, "S4", "C2");
dataset.addValue(11.0, "S4", "C3");
dataset.addValue(0.0, "S4", "C4");
dataset.addValue(-8.0, "S5", "C1");
dataset.addValue(-6.0, "S5", "C2");
dataset.addValue(10.0, "S5", "C3");
dataset.addValue(-9.0, "S5", "C4");
dataset.addValue(9.0, "S6", "C1");
dataset.addValue(8.0, "S6", "C2");
dataset.addValue(null, "S6", "C3");
dataset.addValue(6.0, "S6", "C4");
dataset.addValue(-10.0, "S7", "C1");
dataset.addValue(9.0, "S7", "C2");
dataset.addValue(7.0, "S7", "C3");
dataset.addValue(7.0, "S7", "C4");
dataset.addValue(11.0, "S8", "C1");
dataset.addValue(13.0, "S8", "C2");
dataset.addValue(9.0, "S8", "C3");
dataset.addValue(9.0, "S8", "C4");
dataset.addValue(-3.0, "S9", "C1");
dataset.addValue(7.0, "S9", "C2");
dataset.addValue(11.0, "S9", "C3");
dataset.addValue(-10.0, "S9", "C4");
JFreeChart chart = ChartFactory.createBarChart3D(
"Bar Chart",
"Category",
"Value",
dataset,
PlotOrientation.VERTICAL,
true,
true,
false
);
return chart;
}
private JFreeChart createTimeSeriesChart() {
// here we just populate a series with random data...
TimeSeries series = new TimeSeries("Random Data");
Day current = new Day(1, Month.JANUARY, 2001);
for (int i = 0; i < 100; i++) {
series.add(current, Math.random() * 100);
current = (Day) current.next();
}
XYDataset data = new TimeSeriesCollection(series);
JFreeChart chart = ChartFactory.createTimeSeriesChart(
"Time Series Chart",
"Date",
"Rate",
data,
true,
true,
false
);
return chart;
}
}
8,如果顺利,通过5.6.7步,我们手上有会有三个CLASS文件.我们将这三个CLASS文件拷到C: Tomcat 5.0 webapps myServlets WEB-INF classescom jrefinery chart demo目录下
9.新建WEB.XML拷贝到C: Tomcat 5.0 webapps myServlets WEB-INF下
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN" " http://java.sun.com/j2ee/dtds/web-app_2.2.dtd"> <web-app> <servlet> <servlet-name> ServletDemo1 </servlet-name> <servlet-class> com.jrefinery.chart.demo.ServletDemo1 </servlet-class> </servlet> <servlet> <servlet-name> ServletDemo2 </servlet-name> <servlet-class> com.jrefinery.chart.demo.ServletDemo2 </servlet-class> </servlet> <servlet> <servlet-name> ServletDemo2ChartGenerator </servlet-name> <servlet-class> com.jrefinery.chart.demo.ServletDemo2ChartGenerator </servlet-class> </servlet> <servlet-mapping> <servlet-name>ServletDemo1</servlet-name> <url-pattern>/servlet/ServletDemo1</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>ServletDemo2</servlet-name> <url-pattern>/servlet/ServletDemo2</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>ServletDemo2ChartGenerator</servlet-name> <url-pattern>/servlet/ServletDemo2ChartGenerator</url-pattern> </servlet-mapping> </web-app>
最后:小心上面的拷贝路径,不知道为什么斜杠出不来
我参考JFreeChart Developer Guide中的例子,我发现生成统计图真的很漂亮,由于我是JAVA初学者,其中的很多东西我也是直接拷贝过来,不过上面代码应该是没有问题的,能正常运行.
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