struts2+JfreeChart实现饼状图，柱状图，线形图

1.基本原理:Jfreechart类生成图片(在tomcat-->temp目录下)，再在页面中用<img src="路径"/>输出

2.导入jar包

commons-logging-1.0.4.jar,freemarker-2.3.8.jar,ognl-2.6.11.jar,struts2-core-2.0.12.jar,xwork-2.0.6.jar

jcommon-1.0.16.jar,jfreechart-1.0.13.jar

3.定义web.xml

<filter>
 <filter-name>struts2</filter-name>
 <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
 </filter>

<filter-mapping>
 <filter-name>struts2</filter-name>
 <url-pattern>/*</url-pattern>
 </filter-mapping>


 <servlet>
 <servlet-name>display</servlet-name>
 <servlet-class>org.jfree.chart.servlet.DisplayChart</servlet-class>

 </servlet>
 <servlet-mapping>
 <servlet-name>display</servlet-name>
 <url-pattern>/servlet/displaychart</url-pattern>
 </servlet-mapping>

 
 <listener>
 <listener-class>org.jfree.chart.servlet.ChartDeleter</listener-class>

 </listener>

4.定义JFreechartFactory类，用来生成饼状,柱状，线性JreeChart对象

package com.jfreechart;

import java.awt.Color;
import java.awt.Font;

import org.jfree.chart.*;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PiePlot;
import org.jfree.chart.title.LegendTitle;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.data.general.DefaultPieDataset;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.general.DatasetUtilities;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.ui.RectangleInsets;
import org.jfree.ui.TextAnchor;
import org.jfree.util.Rotation;

import org.jfree.chart.axis.AxisLocation;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.renderer.category.BarRenderer3D;
import org.jfree.chart.renderer.xy.XYItemRenderer;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.chart.labels.*;
import org.jfree.chart.plot.*;
import org.jfree.data.time.*;

public class JFreeChartFactory {

public static JFreeChart CreateBarChart()
{
  // 生成普通饼图
   JFreeChart chart = ChartFactory.createBarChart3D
("", "肉类", "销量",
     getBarDateSet(),
     PlotOrientation.VERTICAL, true, false, false);
   // 重新设置图表标题，改变字体
   chart.setTitle(new TextTitle("肉量销售图"
    , new Font("黑体", Font.ITALIC , 22)));
   // 取得统计图表的第一个图例
   LegendTitle legend = chart.getLegend(0);
   // 修改图例的字体(解决乱码)
   legend.setItemFont(new Font("宋体", Font.BOLD, 14));
   // 获得饼图的 Plot 对象
   CategoryPlot plot = chart.getCategoryPlot();

   ValueAxis valueAxis=plot.getRangeAxis();

   valueAxis.setLabelFont(new Font("楷体", Font.BOLD, 14));//设置y轴的标题(解决乱码问题)
   valueAxis.setTickLabelFont(new Font("楷体", Font.BOLD, 14));//设置y轴上的文字(解决乱码问题)

   //valueAxis.setAutoRange(true);
   //valueAxis.setFixedAutoRange(50);
   valueAxis.setAutoRangeMinimumSize(50);
   valueAxis.setLowerBound(0);
   valueAxis.setUpperBound(700);

   plot.getDomainAxis().setLabelFont(new Font("楷体", Font.BOLD, 14));//设置x轴的标题(解决乱码问题)
   plot.getDomainAxis().setTickLabelFont(new Font("楷体", Font.BOLD, 14));//设置x轴上的文字(解决乱码问题)

   //设置背景色
   plot.setBackgroundPaint(Color.white);

   //设置y轴的线条颜色
   plot.setDomainGridlinePaint(Color.PINK);
  //设置x轴的线条颜色
   plot.setRangeGridlinePaint(Color.PINK);


   BarRenderer3D renderer=new BarRenderer3D();
   renderer.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());
   renderer.setBaseItemLabelsVisible(true);

   //注意：此句很关键，若无此句，那数字的显示会被覆盖，给人数字没有显示出来的问题
   renderer.setBasePositiveItemLabelPosition(new ItemLabelPosition(ItemLabelAnchor.OUTSIDE12,TextAnchor.BASELINE_LEFT));
   renderer.setItemLabelAnchorOffset(10D);

   plot.setRenderer(renderer);

   //将下方的“肉类”放到上方
  // plot.setDomainAxisLocation(AxisLocation.TOP_OR_RIGHT);
   //将默认放在左边的“销量”放到右方
   plot.setRangeAxisLocation(AxisLocation.BOTTOM_OR_RIGHT);


   // 设定背景透明度（0-1.0 之间）
   plot.setBackgroundAlpha(0.9f);

   return chart;
}

private static CategoryDataset getBarDateSet()
{
  double da[][]=new double[][]{{200,340,400},
    {300,640,200},
    {400,340,100}};
  String row[]={"猪肉","狗肉","羊肉"};
  String colu[]={"广州","深圳","上海"};

  return DatasetUtilities.createCategoryDataset(row, colu, da);

}

public static JFreeChart CreateLineChart()
{


  JFreeChart chart = ChartFactory.createTimeSeriesChart("访问量统计时间线","月份",
    "访问量",getLineDateSet(),true,true,true);





  //设置子标题
  TextTitle subtitle=new TextTitle("2007年度",new Font("黑体",Font.BOLD,12));
  chart.addSubtitle(subtitle);
  //设置主标题
  chart.setTitle(new TextTitle("阿蜜果blog访问量统计",new Font("隶书",Font.ITALIC,15)));


  // 取得统计图表的第一个图例
   LegendTitle legend = chart.getLegend(0);
   // 修改图例的字体(解决乱码)
   legend.setItemFont(new Font("宋体", Font.BOLD, 14));

   XYPlot plot = chart.getXYPlot();

   ValueAxis valueAxis=plot.getRangeAxis();

   valueAxis.setLabelFont(new Font("楷体", Font.BOLD, 14));//设置y轴的标题(解决乱码问题)
   valueAxis.setTickLabelFont(new Font("楷体", Font.BOLD, 14));//设置y轴上的文字(解决乱码问题)

   plot.getDomainAxis().setLabelFont(new Font("楷体", Font.BOLD, 14));//设置x轴的标题(解决乱码问题)
   plot.getDomainAxis().setTickLabelFont(new Font("楷体", Font.BOLD, 14));//设置x轴上的文字(解决乱码问题)



  //设置网格背景颜色
   plot.setBackgroundPaint(Color.white);
   //设置网格竖线颜色
   plot.setDomainGridlinePaint(Color.BLUE);
   //设置网格横线颜色
   plot.setRangeGridlinePaint(Color.pink);
   //设置曲线图与xy轴的距离
   plot.setAxisOffset(new RectangleInsets(0D, 0D, 0D, 10D));

  // XYLineAndShapeRenderer xylineandshaperenderer = (XYLineAndShapeRenderer)plot.getRenderer();
   //xylineandshaperenderer.setBaseItemLabelsVisible(true);

  //设置曲线显示各数据点的值
   XYItemRenderer xyitem = plot.getRenderer();
   xyitem.setBaseItemLabelsVisible(true);
    xyitem.setBasePositiveItemLabelPosition(
     new ItemLabelPosition(ItemLabelAnchor.OUTSIDE12,
       TextAnchor.BASELINE_LEFT));
   xyitem.setBaseItemLabelGenerator(new
     StandardXYItemLabelGenerator());
   xyitem.setBaseItemLabelFont(new Font("Dialog", 1, 14));
   plot.setRenderer(xyitem);

  chart.setAntiAlias(true);
  return chart;
}

private static TimeSeriesCollection getLineDateSet()
{
  //访问量统计时间线
  TimeSeries timeSeries1=new TimeSeries("2010",Month.class);
  TimeSeries timeSeries2=new TimeSeries("2011",Month.class);
  //时间曲线数据集合
  TimeSeriesCollection lineDataset=new TimeSeriesCollection();
  //构造数据集合
  timeSeries1.add(new Month(1,2011), 11200);
  timeSeries1.add(new Month(2, 2011), 9000);
  timeSeries1.add(new Month(3, 2011), 6200);
  timeSeries1.add(new Month(4, 2011), 8200);
  timeSeries1.add(new Month(5, 2011), 8200);
  timeSeries1.add(new Month(6, 2011), 12200);
  timeSeries1.add(new Month(7, 2011), 13200);

  timeSeries2.add(new Month(1,2011), 1120);
  timeSeries2.add(new Month(2, 2011), 800);
  timeSeries2.add(new Month(3, 2011), 3200);
  timeSeries2.add(new Month(4, 2011), 2200);
  timeSeries2.add(new Month(5, 2011), 1200);
  timeSeries2.add(new Month(6, 2011), 62200);
  timeSeries2.add(new Month(7, 2011), 3200);

  lineDataset.addSeries(timeSeries1);
  lineDataset.addSeries(timeSeries2);
  return lineDataset;
}

public static JFreeChart CreatePieChart()
{
  // 生成普通饼图
   JFreeChart chart = ChartFactory.createPieChart3D(
   "", // 图表标题
   getPieDataSet(), // 数据
    true, // 是否显示图例
    true, // 是否显示工具提示
    false // 是否生成 URL
   );
   // 重新设置图表标题，改变字体
   chart.setTitle(new TextTitle("图书销量统计图"
    , new Font("黑体", Font.ITALIC , 14)));
   // 取得统计图表的第一个图例
   LegendTitle legend = chart.getLegend(0);
   // 修改图例的字体
   legend.setItemFont(new Font("宋体", Font.BOLD, 12));
   // 获得饼图的 Plot 对象
   PiePlot plot = (PiePlot)chart.getPlot();
   // 设置饼图各部分的标签字体
   plot.setLabelFont(new Font("楷体", Font.BOLD, 12));




  //设置开始角度
   plot.setStartAngle(150D);
   //设置方向为”顺时针方向“
   plot.setDirection(Rotation.CLOCKWISE);
   //设置透明度，0.5F为半透明，1为不透明，0为全透明
   plot.setForegroundAlpha(0.5F);

   // 设定背景透明度（0-1.0 之间）
   plot.setBackgroundAlpha(0.9f);

   return chart;
}

private static DefaultPieDataset getPieDataSet()
{
   // 提供生成饼图的数据
   DefaultPieDataset dataset = new DefaultPieDataset();
   dataset.setValue("疯狂 Java 讲义",47000);
   dataset.setValue("轻量级 Java EE 企业实战",38000);
   dataset.setValue("疯狂 Ajax 讲义",31000);
   dataset.setValue("Struts 2 权威指南",29000);
   dataset.setValue("疯狂 XML 讲义",25000);
   return dataset;
}

}

5.定义Action类(定义3个属性，分别用来存储饼状,柱状，线性图片的输出路径)

package com.test.action;

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;

import com.opensymphony.xwork2.ActionSupport;

import com.jfreechart.*;

import org.apache.struts2.ServletActionContext;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.servlet.ServletUtilities;
import org.jfree.chart.servlet.DisplayChart;

public class LoginAction extends ActionSupport {

/**
*
*/

private String username;
private String pwd;

private String barchart;
private String linechart;
private String piechart;
public String getUsername() {
  return username;
}
public void setUsername(String username) {
  this.username = username;
}
public String getPwd() {
  return pwd;
}
public void setPwd(String pwd) {
  this.pwd = pwd;
}

public String ForwardLogin()
{
  return "input";
}

public String execute() throws Exception
{
  CreatePie();
  CreateLine();
  CreateBar();
  //System.out.println("execute");
  return "first";
}

public String getBarchart() {
  return barchart;
}
public void setBarchart(String barchart) {
  this.barchart = barchart;
}
public String getLinechart() {
  return linechart;
}
public void setLinechart(String linechart) {
  this.linechart = linechart;
}
public String getPiechart() {
  return piechart;
}
public void setPiechart(String piechart) {
  this.piechart = piechart;
}

/**
* 创建饼形
* @throws IOException
*/
private void CreatePie() throws IOException
{
  HttpServletRequest request=ServletActionContext.getRequest();

  JFreeChart chart=JFreeChartFactory.CreatePieChart();
  String st=ServletUtilities.saveChartAsJPEG(chart,500,400,request.getSession());

  piechart=new StringBuffer(request.getContextPath()).append("/servlet/displaychart?filename="+st).toString();

}

/**
* 创建线性
* @throws IOException
*/
private void CreateLine() throws IOException
{
  HttpServletRequest request=ServletActionContext.getRequest();

  JFreeChart chart=JFreeChartFactory.CreateLineChart();
  String st=ServletUtilities.saveChartAsJPEG(chart,500,400,request.getSession());

  linechart=new StringBuffer(request.getContextPath()).append("/servlet/displaychart?filename="+st).toString();

}

/**
* 创建柱形
* @throws IOException
*/
private void CreateBar() throws IOException
{
  HttpServletRequest request=ServletActionContext.getRequest();

  JFreeChart chart=JFreeChartFactory.CreateBarChart();
  String st=ServletUtilities.saveChartAsJPEG(chart,500,400,request.getSession());

  barchart=new StringBuffer(request.getContextPath()).append("/servlet/displaychart?filename="+st).toString();

}

}