JFreeChart 饼型 柱状图 servlet输出 简单案例

//创建饼型servlet
import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServlet;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.data.general.DefaultPieDataset;
/**  
  *   演示通过servlet直接输出图表  
  *   @author   Winter   Lau  
  */  
public   class   ChartDemoServlet   extends   HttpServlet   {  
 
public   void   service(ServletRequest   req,   ServletResponse   res)throws ServletException,   IOException{  
res.setContentType("image/jpeg");  
DefaultPieDataset   data   =   getDataSet();  
JFreeChart   chart   =   ChartFactory.createPieChart3D("水果产量图",  
data,  
true,  
false,  
false  
);  
 
ChartUtilities.writeChartAsJPEG(res.getOutputStream(),  
100,chart,400,300,null);  
}  
/**  
  *   获取一个演示用的简单数据集对象  
  *   @return  
  */  
private   static   DefaultPieDataset   getDataSet()   {  
DefaultPieDataset   dataset   =   new   DefaultPieDataset();  
dataset.setValue("苹果",100);  
dataset.setValue("梨子",200);  
dataset.setValue("葡萄",300);  
dataset.setValue("香蕉",400);  
dataset.setValue("荔枝",500);  
return   dataset;  
}  
}  

//创建柱型servlet
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;

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.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.data.general.DefaultPieDataset;

public class postservlet extends HttpServlet {

/**
* Constructor of the object.
*/
public postservlet() {
super();
}

/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}

/**
* The doGet method of the servlet. <br>
*
* 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 {

response.setContentType("image/jpeg");  

CategoryDataset dataset = getDataSet2();
JFreeChart chart = ChartFactory.createBarChart3D(
"水果产量图", // 图表标题
"水果", // 目录轴的显示标签
"产量", // 数值轴的显示标签
dataset, // 数据集
PlotOrientation.VERTICAL, // 图表方向：水平、垂直
true, // 是否显示图例(对于简单的柱状图必须是false)
false, // 是否生成工具
false // 是否生成URL链接
); 
 
ChartUtilities.writeChartAsJPEG(response.getOutputStream(),  
100,chart,400,300,null);  
}  
/** * 获取一个演示用的组合数据集对象 * @return */
private static CategoryDataset getDataSet2() {
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
dataset.addValue(500, "北京", "苹果");
dataset.addValue(100, "上海", "苹果");
dataset.addValue(100, "广州", "苹果");
dataset.addValue(200, "北京", "梨子");
dataset.addValue(200, "上海", "梨子");
dataset.addValue(200, "广州", "梨子");
dataset.addValue(300, "北京", "葡萄");
dataset.addValue(300, "上海", "葡萄");
dataset.addValue(300, "广州", "葡萄");
dataset.addValue(400, "北京", "香蕉");
dataset.addValue(400, "上海", "香蕉");
dataset.addValue(400, "广州", "香蕉");
dataset.addValue(500, "北京", "荔枝");
dataset.addValue(500, "上海", "荔枝");
dataset.addValue(500, "广州", "荔枝");
dataset.addValue(320, "山东", "蔬菜");
return dataset;
}

/**
* The doPost method of the servlet. <br>
*
* 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 {
doGet(request,response);
}

/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}

}


//别忘记把3个jfreechart的jar包引入
//创建index.jsp演示
<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
   
    <title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">   
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
  </head>
 
  <body>
    This is my JSP page. <br>
    <img src="./ChartDemoServlet"/>
    <img src="./postservlet"/>
  </body>
</html>

评论

1 楼 afasdfasdf 2008-07-07  

这个就不必，jc自带的例子已经很全了。