使用JFreeChart制作报表的详细例子

package demo;

import java.awt.Color;
import java.awt.Font;
import java.awt.GradientPaint;
import java.awt.RenderingHints;
import java.io.PrintWriter;

import javax.servlet.http.HttpSession;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartRenderingInfo;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.CategoryLabelPositions;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.StandardEntityCollection;
import org.jfree.chart.labels.CategoryItemLabelGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.category.BarRenderer;
import org.jfree.chart.renderer.category.CategoryItemRenderer;
import org.jfree.chart.servlet.ServletUtilities;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;

public class CategoryItemChart {
 public static String generateBarChart(
         HttpSession session,
         PrintWriter pw,
         int w, int h) {
 String filename = null;
 try {
 CategoryDataset dataset=createDataset();
 JFreeChart chart=ChartFactory.createBarChart(
 "世界傻瓜大奖赛",//图表标题
 "比赛场次",//X轴标题
 "傻瓜程度",//Y轴标题
 dataset,//数据集合
 PlotOrientation.VERTICAL,//图表显示方向（水平、垂直）
 true,//是否使用图例
 false,//是否使用工具提示
 false//是否为图表增加URL
 );
 
 /*------------配置图表属性--------------*/
 // 1,设置整个图表背景颜色
 chart.setBackgroundPaint(Color.yellow);
 
 
 /*------------设定Plot参数-------------*/
 CategoryPlot plot=chart.getCategoryPlot();
 // 2,设置详细图表的显示细节部分的背景颜色
 plot.setBackgroundPaint(Color.PINK);
 // 3,设置垂直网格线颜色
 plot.setDomainGridlinePaint(Color.black);
 //4,设置是否显示垂直网格线
 plot.setDomainGridlinesVisible(true);
 //5,设置水平网格线颜色
 plot.setRangeGridlinePaint(Color.yellow);
 //6,设置是否显示水平网格线
 plot.setRangeGridlinesVisible(true);
 
 /*---------将所有数据转换为整数形式---------*/
 final NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
 rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
 
 /*---------设置是否在柱图的状态条上显示边框----*/
 CategoryItemRenderer renderer = (CategoryItemRenderer) plot.getRenderer();
 BarRenderer  render=(BarRenderer) plot.getRenderer();
 render.setItemMargin(0.1);
 
 /*---------设置状态条颜色的深浅渐变-----------*/
    GradientPaint gp0 = new GradientPaint(
            0.0f, 0.0f, new Color(255,200,80),
            0.0f, 0.0f, new Color(255,255,40)
            );
    GradientPaint gp1 = new GradientPaint(
            0.0f, 0.0f, new Color(50,255,50),
            0.0f, 0.0f, new Color(100,255,100)
            );
    GradientPaint gp2 = new GradientPaint(
            0.0f, 0.0f, Color.red,
            0.0f, 0.0f, new Color(255,100,100)
            );
    GradientPaint gp3 = new GradientPaint(
                0.0f, 0.0f, new Color(108,108,255),
                0.0f, 0.0f, new Color(150, 150, 200)
                );
              
    renderer.setSeriesPaint(0, gp0);
    renderer.setSeriesPaint(1, gp1);
    renderer.setSeriesPaint(2, gp2);
    renderer.setSeriesPaint(3, gp3);

    /*
     * 
     * 解决柱状体与图片边框的间距问题
     * 
     * 
     * */                 
    /*------设置X轴标题的倾斜程度----*/
    CategoryAxis domainAxis = plot.getDomainAxis();
    domainAxis.setCategoryLabelPositions(
    CategoryLabelPositions.createUpRotationLabelPositions(Math.PI / 6.0)
    );
    /*------设置柱状体与图片边框的左右间距--*/
    domainAxis.setLowerMargin(0.01);
    domainAxis.setUpperMargin(0.01);

    /*------设置柱状体与图片边框的上下间距---*/
    ValueAxis rAxis = plot.getRangeAxis();
    rAxis.setUpperMargin(0.15);
    rAxis.setLowerMargin(0.15);
    
    /*---------设置每一组柱状体之间的间隔---------*/
    render.setItemMargin(0.0); 
    /*
     * 
     * 解决柱状体与图片边框的间距问题
     * 
     * 
     * */  
    
    
    
    
    
    /*
     * 
     * 
     * 解决JFREECHART的中文显示问题
     * 
     * 
     * */
    
    /*----------设置消除字体的锯齿渲染（解决中文问题）--------------*/
    chart.getRenderingHints().put(
            RenderingHints.KEY_TEXT_ANTIALIASING,RenderingHints.VALUE_TEXT_ANTIALIAS_OFF
            );
    /*----------设置标题字体--------------------------*/
    TextTitle textTitle = chart.getTitle();
    textTitle.setFont(new Font("黑体", Font.PLAIN, 20));        
    /*------设置X轴坐标上的文字-----------*/
    domainAxis.setTickLabelFont(new Font("sans-serif",Font.PLAIN,11));
    /*------设置X轴的标题文字------------*/
    domainAxis.setLabelFont(new Font("宋体",Font.PLAIN,12));         
    /*------设置Y轴坐标上的文字-----------*/
    rAxis.setTickLabelFont(new Font("sans-serif",Font.PLAIN,12));
    /*------设置Y轴的标题文字------------*/
    rAxis.setLabelFont(new Font("黑体",Font.PLAIN,12)); 
    
    /*---------设置柱状体上的显示的字体---------*/         
    renderer.setItemLabelGenerator(new LabelGenerator(0.0));
    renderer.setItemLabelFont(new Font("宋体",Font.PLAIN,12));
    renderer.setItemLabelsVisible(true);
    
    /*
     * 
     * 
     * 解决JFREECHART的中文显示问题
     * 
     * 
     * */     

 /*------得到chart的保存路径----*/
    ChartRenderingInfo info = new ChartRenderingInfo(new
            StandardEntityCollection());
 filename = ServletUtilities.saveChartAsPNG(chart, w, h, info, session);
 
 /*------使用printWriter将文件写出----*/
 ChartUtilities.writeImageMap(pw, filename, info,true);
 pw.flush();
 
 }
 catch (Exception e) {
 System.out.println("Exception - " + e.toString());
 e.printStackTrace(System.out);
 filename = "public_error_500x300.png";
 }
 return filename;
 }
 
 
 /*-------------设置柱状体顶端的数据显示--------------*/
 static class LabelGenerator implements CategoryItemLabelGenerator {
 
 private double threshold;
 
 public LabelGenerator(double threshold) {
 this.threshold = threshold;
 }
 
 public String generateLabel(CategoryDataset dataset,
 int row,int column) {
 String result = null;
 final Number value = dataset.getValue(row, column);
 if (value != null) {
 final double v = value.doubleValue();
 if (v > this.threshold) {
 result = value.toString(); 
 }
 }
 return result;
 }
 
 public String generateRowLabel(CategoryDataset dataset,
 int row){
 return null;
 
 }
 public String generateColumnLabel(CategoryDataset dataset,
 int column){
 return null;
 }
 
 
 
 }
 /*-----------数据集合封装-------------*/
 private static CategoryDataset createDataset(){
 String s1="笨笨";
 String s2="蛋蛋";
 String s3="傻傻";
 String s4="瓜瓜";
 
 String c1="第一场";
 String c2="第二场";
 String c3="第三场";
 String c4="第四场";
 String c5="第五场";
 
 /*-------------封装图表使用的数据集-------------*/
 DefaultCategoryDataset dataset=new DefaultCategoryDataset();
 dataset.setValue(1.0,s1,c1);
 dataset.setValue(2.0,s1,c2);
 dataset.setValue(3.0,s1,c3);
 dataset.setValue(4.0,s1,c4);
 dataset.setValue(5.0,s1,c5);
 
 dataset.setValue(5.0,s2,c1);
 dataset.setValue(4.0,s2,c2);
 dataset.setValue(3.0,s2,c3);
 dataset.setValue(2.0,s2,c4);
 dataset.setValue(1.0,s2,c5);
 
 dataset.setValue(1.0,s3,c1);
 dataset.setValue(2.0,s3,c2);
 dataset.setValue(3.0,s3,c3);
 dataset.setValue(2.0,s3,c4);
 dataset.setValue(1.0,s3,c5);
 
 dataset.setValue(1.0,s4,c1);
 dataset.setValue(2.0,s4,c2);
 dataset.setValue(3.0,s4,c3);
 dataset.setValue(4.0,s4,c4);
 dataset.setValue(5.0,s4,c5);
 
 
 return dataset;
 }
     
 }

 

<%@ page contentType="text/html;charset=GBK"%>
<%@ page import="demo.CategoryItemChart"%>
<%@ page import="java.io.PrintWriter"%>

<html>
<head>
<title>
</title>
<%
//以下部分为图象输出

String fileName=CategoryItemChart.generateBarChart(session,new PrintWriter(out),580,250);
String graphURL = request.getContextPath() + "/servlet/DisplayChart?filename=" + fileName;

%>

</head>
<body bgcolor="#ffffff">
<table  width="580" border="0" cellspacing="0" cellpadding="0">
  <tr>
    <td>
      <img src="<%= graphURL %>" width=580 height=250 border=0
         >
    </td>
  </tr>
</table>
</body>
</html>

 

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" 
	xmlns="http://java.sun.com/xml/ns/j2ee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
	http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
  <servlet>
<servlet-name>DisplayChart</servlet-name>
<servlet-class>org.jfree.chart.servlet.DisplayChart</servlet-class>
</servlet>
<servlet-mapping> 
<servlet-name>DisplayChart</servlet-name>
<url-pattern>/servlet/DisplayChart</url-pattern>
</servlet-mapping> 
  
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

  效果如附件：