Struts2+JFreeChart

struts2-showcase-2.0.6.war：这个是官方自带的Demo（struts-2.0.6-all.zip\struts-2.0.6\apps目录下），非常全面，直接部署就可以了（很多朋友Struts2能学很好我估计还是直接从这里学来的）。

(1)

实例一：

struts.xml

< struts >
         < package name ="jFreeChartDemonstration" extends ="struts-default"
                 namespace ="/jfreechart" >
                 < result-types >
                         < result-type name ="chart" class ="org.apache.struts2.dispatcher.ChartResult" > </ result-type >
                 </ result-types >
                 < action name ="JFreeChartAction" class ="com.tangjun.struts2.JFreeChartAction" >
                             < result type ="chart" >    
                                     < param name ="width" >400 </ param >
                                     < param name ="height" >300 </ param >
                         </ result >
                 </ action >
         </ package >
</ struts >

struts.properties

struts.ui.theme=simple

这里直接调用已经写好的类ChartResult，这个类是继承自com.opensymphony.xwork2.Result,传入生成图片大小的参数width和height就可以了。

2.

新建JFreeChartAction继承ActionSupport,生成JFreeChart对象并保存到chart中，注意这个名称是固定的。

public class JFreeChartAction extends ActionSupport {
//供ChartResult调用->ActionInvocation.getStack().findValue("chart")
         private JFreeChart chart;
        
        @Override
         public String execute() throws Exception {
                 //设置数据
                DefaultPieDataset data = new DefaultPieDataset();
                data.setValue( "Java", new Double(43.2));
                data.setValue( "Visual Basic", new Double(1.0));
                data.setValue( "C/C++", new Double(17.5));
                data.setValue( "tangjun", new Double(60.0));
                 //生成JFreeChart对象
                chart = ChartFactory.createPieChart( "Pie Chart", data, true, true, false);
                
                 return SUCCESS;
        }

         public JFreeChart getChart() {
                 return chart;
        }

         public void setChart(JFreeChart chart) {
                 this.chart = chart;
        }
}

显示结果如下：

(2)

实例二：

1、在struts2中，默认的struts-default.xml中，并没有包含chart的result-type，它是插件的形式使用的。把 struts2的解压包的lib里找到struts2-jfreechart-plugin-2.0.11.jar，拷贝到你的项目的 classpath里，同时在struts.xml里面增加一个chart的result-type。

<result-types>
  <result-type name= "chart" class= "org.apache.struts2.dispatcher.ChartResult"/>
</result-types>
<action name= "ListAllFruit4Bar2" class= "chart.ListAllFruit4Bar2Action">
  <result name= "success" type= "chart">
    <param name= "chart">chart</param>
    <param name= "height">400</param>
    <param name= "width">700</param>
  </result>
</action>
<action name= "ListAllFruit4Pie2" class= "chart.ListAllFruit4Pie2Action">
  <result name= "success" type= "chart">
    <param name= "chart">chart</param>
    <param name= "height">400</param>
    <param name= "width">700</param>
  </result>
</action>

2、需要再添加jfreechart-1.0.9.jar和jcommon-1.0.12.jar（JasperReports和JFreeChart都需要的）到你的classpath里面。
3、在你的action代码里，返回一个JFreeChart对象即可。

ListAllFruit4Bar2Action代码：

package chart;

import org.jfree.chart.JFreeChart;

import com.opensymphony.xwork2.ActionSupport;

public class ListAllFruit4Bar2Action extends ActionSupport {
   private static final long serialVersionUID = 1L;
         private JFreeChart chart;
    
  @Override
   public String execute() throws Exception {
    chart = FruitService.createBarChart();
     return SUCCESS;
  }
    
   public JFreeChart getChart() {
     return chart;
  }
}

ListAllFruit4Pie2Action代码：

package chart;

import org.jfree.chart.JFreeChart;

import com.opensymphony.xwork2.ActionSupport;

public class ListAllFruit4Pie2Action extends ActionSupport {
   private static final long serialVersionUID = 1L;
         private JFreeChart chart;
    
  @Override
   public String execute() throws Exception {
    chart = FruitService.createPaiChart();
     return SUCCESS;
  }
    
   public JFreeChart getChart() {
     return chart;
  }
}

FruitService代码：

package chart;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;

public class FruitService {

   public static JFreeChart createBarChart() {
    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)
         true,     // 是否生成工具
         true     // 是否生成URL链接
        );
     return chart;
  }

   private static CategoryDataset getDataSet2() {
    DefaultCategoryDataset dataset = new DefaultCategoryDataset();
    dataset.addValue(100, "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");
     return dataset;
  }
            
         public static JFreeChart createPaiChart() {
    DefaultPieDataset data = getDataSet();
    JFreeChart chart = ChartFactory.createPieChart3D( "水果产量图",     // 图表标题
    data,    
     true, // 是否显示图例
     false,
     false
    );
    PiePlot plot = (PiePlot) chart.getPlot();
    resetPiePlot(plot);
     return chart;
  }
    
   private static void resetPiePlot(PiePlot plot) {
    String unitSytle = "{0}={1}({2})";
    
    plot.setNoDataMessage( "无对应的数据，请重新查询。");
    plot.setNoDataMessagePaint(Color.red);
    
     //指定 section 轮廓线的厚度(OutlinePaint不能为null)
    plot.setOutlineStroke( new BasicStroke(0));
    
     //设置第一个 section 的开始位置，默认是12点钟方向
    plot.setStartAngle(90);        

    plot.setToolTipGenerator( new StandardPieToolTipGenerator(unitSytle,
        NumberFormat.getNumberInstance(),
         new DecimalFormat( "0.00%")));
    
     //指定图片的透明度
    plot.setForegroundAlpha(0.65f);
    
     //引出标签显示样式
    plot.setLabelGenerator( new StandardPieSectionLabelGenerator(unitSytle,
        NumberFormat.getNumberInstance(),
         new DecimalFormat( "0.00%")));
        
     //图例显示样式
    plot.setLegendLabelGenerator( new StandardPieSectionLabelGenerator(unitSytle,
        NumberFormat.getNumberInstance(),
         new DecimalFormat( "0.00%")));
  }

   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;
  }

}

4、同时在jsp页面里显示--柱图和饼图。
增加一个ListAllFruit4BarAndPie的action：

<action name= "ListAllFruit4BarAndPie" class="">
  <result name= "success" type= "dispatcher">/WEB-INF/chart/ListAllFruit4BarAndPie.jsp</result>
</action>

ListAllFruit4BarAndPie.jsp代码：

<%@ page contentType= "text/html; charset=UTF-8" %>
<html>
<head>
        <title>ListAllFruit4BarAndPie</title>
</head>
<body>
  <center><h2>使用柱图和饼图列取所有水果产量</h2></center>
  柱图:<img src= "chart/ListAllFruit4Bar2.action"><br/>
  饼图:<img src= "chart/ListAllFruit4Pie2.action">
</body>
</html>

生成的HTML的效果图如下：