JavaWeb實(shí)現(xiàn)圖形報(bào)表折線圖的方法

package com.mengya.util;
import java.awt.Color;
import java.awt.Font;
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.StandardLegend;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.entity.StandardEntityCollection;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.LineAndShapeRenderer;
import org.jfree.chart.servlet.ServletUtilities;
import org.jfree.data.DefaultCategoryDataset;
public class Line
{
  private DefaultCategoryDataset dataset = new DefaultCategoryDataset();
  public void setValue(int sum, String line, String wfield)
  {
   dataset.addValue(sum, line, wfield);
  }
  public String generateLineChart(String title,String wfield, String hfield, HttpSession session, PrintWriter pw,int wPhoto,int hPhoto)
  {
   String filename = null;
  try
   {
     final JFreeChart chart = ChartFactory.createLineChart
      (
       title, // 圖表標(biāo)題
       wfield, // 橫軸的顯示標(biāo)簽
       hfield, // 縱軸的顯示標(biāo)簽
       dataset, //數(shù)據(jù)集
       PlotOrientation.VERTICAL, // 圖表方向：水平、垂直
       true, // 是否顯示圖例
       true, // 是否生成提示工具 tooltips
       false // 是否生成URL鏈接
     );
     StandardLegend legend = (StandardLegend) chart.getLegend();//生成圖例
     legend.setDisplaySeriesShapes(true);//顯示圖例形狀
     legend.setShapeScaleX(1.5);//設(shè)置圖例X軸的大小
     legend.setShapeScaleY(1.5);//設(shè)置圖例Y軸的大小
     legend.setDisplaySeriesLines(true);//顯示圖示項(xiàng)的橫線
     //設(shè)置圖片的背景色
     chart.setBackgroundPaint(new java.awt.Color(189,235,255));
     CategoryPlot plot = (CategoryPlot) chart.getPlot();
     plot.setBackgroundPaint(new Color(239,251,255));//生成圖片中墻體的背景色
     plot.setRangeGridlinePaint(Color.black);//生成圖片中格子線的顏色
     // 沒有數(shù)據(jù)時(shí)顯示的消息
     plot.setNoDataMessage("沒有相關(guān)統(tǒng)計(jì)數(shù)據(jù)");
     plot.setNoDataMessageFont(new Font("黑體", Font.CENTER_BASELINE, 16));
     plot.setNoDataMessagePaint(Color.RED);
     NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
     rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());//設(shè)置圖中的刻度線的單位
     rangeAxis.setAutoRangeIncludesZero(true);//強(qiáng)制在自動(dòng)選擇的數(shù)據(jù)范圍中包含0
     LineAndShapeRenderer renderer = (LineAndShapeRenderer) plot.getRenderer();
     renderer.setDrawShapes(true);//折線的數(shù)據(jù)點(diǎn)根據(jù)分類使用不同的形狀
     renderer.setItemLabelsVisible(true);//顯示每個(gè)點(diǎn)上的數(shù)據(jù)值的提示工具,數(shù)據(jù)標(biāo)簽是否可見
     ChartRenderingInfo info = new ChartRenderingInfo(new
       StandardEntityCollection());
     //500是圖片長度，300是圖片高度
     filename = ServletUtilities.saveChartAsPNG(chart, wPhoto, hPhoto, info, session);
     ChartUtilities.writeImageMap(pw, filename, info);
     pw.flush();
   }
   catch(Exception e)
   {
   e.printStackTrace();
   }
   return filename;
  }
}

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>/DisplayChart/url-pattern>
/servlet-mapping>

%@ page language="java" import="java.util.*,com.mengya.util.Line,com.mengya.bean.StuBean" pageEncoding="gbk"%>
%@page import="java.io.PrintWriter;"%>
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
html>
 head>
 title>折線圖/title>
 /head>
 body>
 %
  Line tt = new Line();
  //第一條折線
  List ar = (ArrayList) request.getAttribute("arr1");
  for (int i = 0; i  ar.size(); i++) {
  StuBean bean = (StuBean) ar.get(i);
  tt.setValue((int) bean.getS_money(), "張明學(xué)個(gè)人消費(fèi)比例圖", bean.getS_month()+ "");
  }
  //條二條折線
  ar = (ArrayList) request.getAttribute("arr2");
  for (int i = 0; i  ar.size(); i++) {
  StuBean bean = (StuBean) ar.get(i);
  tt.setValue((int) bean.getS_money(), "夢(mèng)婭個(gè)人消費(fèi)比例圖", bean.getS_month()+ "");
  }
  //說明:tt.setValue(int a,String b,String c)
  //其中的第二個(gè)參數(shù)b是該條折線的名字,每條折線的名字最好不要一樣.
  String filename = tt.generateLineChart("個(gè)人消費(fèi)比例圖", "月   份",
   "費(fèi)   用", session, new PrintWriter(out), 800, 550);
  String graphURL = request.getContextPath()
   + "/DisplayChart?filename=" + filename;
 %>
 P ALIGN="CENTER">
 img src="%=graphURL %>" width=800 height=550 border=1 usemap="#%=filename%>">
 /body>
/html>