Tomcat下使用Jfreechart 简单例子(servlet)

　　这个例子是我参考JFreeChart Developer Guide做.用Google搜一下,可以下载到.

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　　1.Tomcat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.

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　　2.去http://www.jfree.org/jfreechart/index.php下载jfreechart-1.0.0-rc1,后解压缩,将jfreechart-1.0.0-rc1.jar,jcommon-1.0.0-rc1.jar,gnujaxp.jar,放到C: Tomcat 5.0webapps　 myServletsWEB-INFlib下 和 C:　j2sdk1.4.2_09lib下. 字串6

　　3.新建index.html 放到C:　Tomcat 5.0　 webapps　 myServlets下

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　　下面有两个简单例子,调用servlet,生成统计图.

• 条形统计图href="servlet/ServletDemo1">条形统计图;


• 可以选择统计图类型 href="chart.html">三种类型.
  

　　4.新建Chart.html 放到C:　Tomcat 5.0　 webapps　　myServlets下 字串3

　　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. 字串7

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　　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");

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　　6.新建ServletDemo2 .java 并用JDK编译 字串2

　　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("");
out.println("");
out.println("");
out.println("");
out.println("");
out.println("

JFreeChart Servlet Demo

");
out.println("");
out.println("");
out.println("");
out.flush();
out.close();
}
catch (Exception e) {
System.err.println(e.toString());
}
finally {
out.close();
}
}
}

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　　7.新建ServletDemo2ChartGenerator .java 并用JDK编译.

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　　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(); 字串2
}
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");

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　　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 字串5

　　
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
"http://java.sun.com/j2ee/dtds/web-app_2.2.dtd">



ServletDemo1


com.jrefinery.chart.demo.ServletDemo1




ServletDemo2


com.jrefinery.chart.demo.ServletDemo2




ServletDemo2ChartGenerator


com.jrefinery.chart.demo.ServletDemo2ChartGenerator



ServletDemo1
/servlet/ServletDemo1


ServletDemo2
/servlet/ServletDemo2


ServletDemo2ChartGenerator

　　10.重启TOMCAT http://172.25.49.1:8080/myServlets/　 . 字串8

　　最后:小心上面拷贝路径,不知道为什么斜杠出不来 字串4

　　我参考JFreeChart Developer Guide中例子,我发现生成统计图真很漂亮,由于我是JAVA初学者,其中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,能正常运行. 字串7