要导入两个jar包：jfreechart.jar jcommon.jar
Servlet：
package com.jxnu.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.servlet.ServletUtilities;
import org.jfree.data.category.DefaultCategoryDataset;
public class BarChartServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
response.setContentType("text/html;chartSet=UTF-8");
HttpSession session = request.getSession();
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
dataset.addValue(3, "", "优秀");
dataset.addValue(8, "", "良好");
dataset.addValue(15, "", "中等");
dataset.addValue(12, "", "及格");
dataset.addValue(8, "", "不及格");
JFreeChart chart = ChartFactory.createBarChart("考试成绩统计图", "成绩", "人数",
dataset, PlotOrientation.HORIZONTAL, false, false, false);
String filename = ServletUtilities.saveChartAsPNG(chart, 300, 200,
session);//一般保存在Session范围内
String graphURL = "/Prj28/DisplayChart?filename=" + filename;
//session.setAttribute("graphURL", graphURL);下面代码也能实现同样功能
request.setAttribute("graphURL", graphURL);
request.getRequestDispatcher("/barChart1.jsp").forward(request,
response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}
JSP页面：
<%@ page language="java" pageEncoding="UTF-8"%>
<html>
<body>
<img src="${requestScope.graphURL}" alt="图片不存在"/>
</body>
</html>
访问地址：http://127.0.0.1:8080/Prj28/servlet/BarChartServlet
用JFreeChart开发图片报表,码迷,mamicode.com
原文地址：http://blog.csdn.net/tangliuqing/article/details/24843599
