利用JFreeChart实现Java中饼状图、柱状图等图表并在Jsp中显示
本例是利用myEclipse + tomcat编译运行的,利用JfreeChart(从网上可下载的java的Jar包)编写的将数据以柱状图、饼状图等图表的形式显示在Jsp页面中
代码片段和文件信息
属性 大小 日期 时间 名称
----------- --------- ---------- ----- ----
文件 589 2009-09-04 07:26 jFreeChart.classpath
文件 303 2009-09-04 07:26 jFreeChart.mymetadata
文件 1228 2009-09-03 17:31 jFreeChart.project
文件 3988 2009-09-04 09:01 jFreeChartsrcjfcservletServletDemo1.java
文件 3481 2009-09-04 09:50 jFreeChartsrcjfcservletServletDemo2.java
文件 5543 2009-09-04 10:14 jFreeChartsrcjfcservletServletDemo2ChartGenerator.java
文件 755 2009-09-03 17:09 jFreeChartsrcjfc estJfreeChartTest.java
文件 1409 2009-09-04 10:13 jFreeChartWebRootChart.jsp
文件 615 2009-09-04 09:23 jFreeChartWebRootindex.jsp
文件 39 2009-09-03 16:26 jFreeChartWebRootmeta-INFMANIFEST.MF
文件 3319 2009-09-04 09:01 jFreeChartWebRootWEB-INFclassesjfcservletServletDemo1.class
文件 1795 2009-09-04 09:50 jFreeChartWebRootWEB-INFclassesjfcservletServletDemo2.class
文件 5346 2009-09-04 10:14 jFreeChartWebRootWEB-INFclassesjfcservletServletDemo2ChartGenerator.class
文件 1290 2009-09-04 07:26 jFreeChartWebRootWEB-INFclassesjfc estJfreeChartTest.class
文件 231445 2009-04-20 10:23 jFreeChartWebRootWEB-INFlibgnujaxp.jar
文件 309293 2009-04-20 10:23 jFreeChartWebRootWEB-INFlibjcommon-1.0.16.jar
文件 1425744 2009-04-20 10:23 jFreeChartWebRootWEB-INFlibjfreechart-1.0.13.jar
文件 2083 2009-09-03 17:21 jFreeChartWebRootWEB-INFweb.xml
目录 0 2009-09-22 14:20 jFreeChartWebRootWEB-INFclassesjfcservlet
目录 0 2009-09-22 14:20 jFreeChartWebRootWEB-INFclassesjfc est
目录 0 2009-09-22 14:20 jFreeChartWebRootWEB-INFclassesjfc
目录 0 2009-09-22 14:20 jFreeChartsrcjfcservlet
目录 0 2009-09-22 14:20 jFreeChartsrcjfc est
目录 0 2009-09-22 14:20 jFreeChartWebRootWEB-INFclasses
目录 0 2009-09-22 14:20 jFreeChartWebRootWEB-INFlib
目录 0 2009-09-22 14:20 jFreeChartsrcjfc
目录 0 2009-09-22 14:20 jFreeChartWebRootmeta-INF
目录 0 2009-09-22 14:20 jFreeChartWebRootWEB-INF
目录 0 2009-09-22 14:20 jFreeChart.myeclipse
目录 0 2009-09-22 14:20 jFreeChartsrc
............此处省略5个文件信息
package jfc.servlet;
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 {
/**
* Constructor of the object.
*/
public ServletDemo1() {
super();
}
/**
* Destruction of the servlet.
*/
public void destroy() {
super.destroy(); // Just puts “destroy“ string in log
// Put your code here
}
/**
* The doGet method of the servlet.
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request HttpServletResponse response)
throws ServletException IOException {
OutputStream out = response.getOutputStream();
try {
response.setContentType(“image/png“);
ChartUtilities.writeChartAsPNG(out createBarChart() 400 300);
}
catch (Exception e) {
System.err.println(e.toString());
}
finally {
out.close();
}
}
/**
* The doPost method of the servlet.
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request HttpServletResponse response)
throws ServletException IOException {
}
/**
* Initialization of the servlet.
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
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
属性 大小 日期 时间 名称
----------- --------- ---------- ----- ----
文件 589 2009-09-04 07:26 jFreeChart.classpath
文件 303 2009-09-04 07:26 jFreeChart.myme
文件 1228 2009-09-03 17:31 jFreeChart.project
文件 3988 2009-09-04 09:01 jFreeChartsrcjfcservletServletDemo1.java
文件 3481 2009-09-04 09:50 jFreeChartsrcjfcservletServletDemo2.java
文件 5543 2009-09-04 10:14 jFreeChartsrcjfcservletServletDemo2ChartGenerator.java
文件 755 2009-09-03 17:09 jFreeChartsrcjfc estJfreeChartTest.java
文件 1409 2009-09-04 10:13 jFreeChartWebRootChart.jsp
文件 615 2009-09-04 09:23 jFreeChartWebRootindex.jsp
文件 39 2009-09-03 16:26 jFreeChartWebRootme
文件 3319 2009-09-04 09:01 jFreeChartWebRootWEB-INFclassesjfcservletServletDemo1.class
文件 1795 2009-09-04 09:50 jFreeChartWebRootWEB-INFclassesjfcservletServletDemo2.class
文件 5346 2009-09-04 10:14 jFreeChartWebRootWEB-INFclassesjfcservletServletDemo2ChartGenerator.class
文件 1290 2009-09-04 07:26 jFreeChartWebRootWEB-INFclassesjfc estJfreeChartTest.class
文件 231445 2009-04-20 10:23 jFreeChartWebRootWEB-INFlibgnujaxp.jar
文件 309293 2009-04-20 10:23 jFreeChartWebRootWEB-INFlibjcommon-1.0.16.jar
文件 1425744 2009-04-20 10:23 jFreeChartWebRootWEB-INFlibjfreechart-1.0.13.jar
文件 2083 2009-09-03 17:21 jFreeChartWebRootWEB-INFweb.xm
目录 0 2009-09-22 14:20 jFreeChartWebRootWEB-INFclassesjfcservlet
目录 0 2009-09-22 14:20 jFreeChartWebRootWEB-INFclassesjfc est
目录 0 2009-09-22 14:20 jFreeChartWebRootWEB-INFclassesjfc
目录 0 2009-09-22 14:20 jFreeChartsrcjfcservlet
目录 0 2009-09-22 14:20 jFreeChartsrcjfc est
目录 0 2009-09-22 14:20 jFreeChartWebRootWEB-INFclasses
目录 0 2009-09-22 14:20 jFreeChartWebRootWEB-INFlib
目录 0 2009-09-22 14:20 jFreeChartsrcjfc
目录 0 2009-09-22 14:20 jFreeChartWebRootme
目录 0 2009-09-22 14:20 jFreeChartWebRootWEB-INF
目录 0 2009-09-22 14:20 jFreeChart.myeclipse
目录 0 2009-09-22 14:20 jFreeChartsrc
............此处省略5个文件信息
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