struts2整合JFreeChart带热点的实例

试验了一下午，终于找到图片不能显示的原因，struts2是一个拦截器，把servlet拦截了，故不能找到配置的DisplayChart，通过在strus.xml里配置
<constant name="struts.action.extension" value="do,action"/>让struts2不拦截servlet,就可以显示map了。

注：此带热点的Action没有使用struts2的jfreechart插件。、

导入包：
       struts2-jfreechart-plugin-2.1.8.1.jar
       jfreechart-1.0.13.jar
       jcommon-1.0.16.jar

1.ChartAction（带热点的Action）

package com.cs.struts2.helloworld;

import java.awt.Color;
import java.awt.Font;
import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartRenderingInfo;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.entity.StandardEntityCollection;
import org.jfree.chart.labels.StandardPieToolTipGenerator;
import org.jfree.chart.plot.PiePlot;
import org.jfree.chart.servlet.ServletUtilities;
import org.jfree.chart.title.LegendTitle;
import org.jfree.chart.title.TextTitle;
import org.jfree.chart.urls.StandardPieURLGenerator;
import org.jfree.data.general.DefaultPieDataset;

import com.opensymphony.xwork2.ActionSupport;

public class ChartAction extends ActionSupport implements ServletRequestAware, ServletResponseAware{
	private HttpServletRequest request;
	private HttpServletResponse response; 
	private String mapMessage;
	private String src;
	 
	public String getChart() throws IOException {
		//生成饼图
		JFreeChart chart = ChartFactory.createPieChart(
				"图书销售统计表",     //图表标题
				getDateSet(),      //数据
				true,             //是否显示图例
				true,            //是否显示工具提示
				true             //是否生成URL
		);
		//设置标题及标题字体
		chart.setTitle(new TextTitle("图书销售统计图",new Font("黑体",Font.ITALIC,22)));
		//建一个图例
		LegendTitle legendTitle = chart.getLegend(0);
		//设置图例字体
		legendTitle.setItemFont(new Font("宋体",Font.BOLD,14));
		//获取饼图plot对象
		PiePlot plot = (PiePlot) chart.getPlot();
		//根据key指定各个数据饼图的颜色
		plot.setSectionPaint("JAVA教程", Color.RED);
		plot.setSectionPaint("c++教程", Color.BLUE);
		plot.setSectionPaint("C#教程", Color.GREEN);
		plot.setSectionPaint("VC++教程", Color.ORANGE);
		//设置plot字体
		plot.setLabelFont(new Font("宋体",Font.BOLD,18));
		//设置背景透明度（0~1）
		plot.setBackgroundAlpha(0.9f);
//-------------------热点设置分割线----------------------------			
		//设定链接
		plot.setNoDataMessage("No data available");
		String str =request.getContextPath()+"/first/bchart.action"; 
		//StandardPieURLGenerator（）不设置第二个参数"type"默认为category
		plot.setURLGenerator(new StandardPieURLGenerator(str,"type"));
		plot.setToolTipGenerator(new StandardPieToolTipGenerator()); 
		StandardEntityCollection sec = new StandardEntityCollection();
		//生成RenderingInfo实例,info参数就是图片的热点信息
		ChartRenderingInfo info = new ChartRenderingInfo(sec); 
        response.setCharacterEncoding("GBK");
        String filename = null;
        try {
         filename = ServletUtilities.saveChartAsJPEG(chart, 700, 500, info, request.getSession());
        } catch (IOException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
        }
         mapMessage = ChartUtilities.getImageMap("map0", info);
         src = request.getContextPath()+"/servletDisplayChart?filename=" + filename;
        
        return "first";
	}
	
	private static DefaultPieDataset getDateSet() {
		//提供生成饼图的数据
		DefaultPieDataset dataset = new DefaultPieDataset();
		dataset.setValue("JAVA教程", 47);
		dataset.setValue("c++教程", 23);
		dataset.setValue("C#教程", 20);
		dataset.setValue("VC++教程", 10);
		return dataset;
	}

	public void setServletRequest(HttpServletRequest request) {
		this.request = request;
	}

	public void setServletResponse(HttpServletResponse response) {
		this.response = response;
	}

	public String getMapMessage() {
		return mapMessage;
	}

	public void setMapMessage(String mapMessage) {
		this.mapMessage = mapMessage;
	}

	public String getSrc() {
		return src;
	}

	public void setSrc(String src) {
		this.src = src;
	}
}

2.ChartActionB（热点目标Action）

package com.cs.struts2.helloworld;

import java.awt.Color;
import java.awt.Font;
import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import org.apache.struts2.interceptor.ServletRequestAware;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;


import com.opensymphony.xwork2.ActionSupport;

public class ChartActionB extends ActionSupport implements ServletRequestAware {
	private HttpServletRequest request;

	public JFreeChart getChart() throws IOException {
//---------------------逻辑判断分割线-------------------------------		
		CategoryDataset dataset;
		String queryString = request.getQueryString();
		queryString = java.net.URLDecoder.decode(queryString , "UTF-8");
		System.out.println(queryString);
		String type = null;
		for(String param : queryString.split("&"))
		{
		String[] nameValue = param.split("=");
		type = nameValue[0].equals("type") ? nameValue[1] : type;
		}
		String subTitle = "";
		if(type.equals("JAVA教程"))
		{
		dataset = getDateSet1();
		subTitle="JAVA教程";
		}
		else if(type.equals("c++教程"))
		{
		dataset = getDateSet4();
		subTitle="c++教程";
		}
		else if(type.equals("C#教程"))
		{
		dataset = getDateSet2();
		subTitle="C#教程";
		}
		else
		{
		dataset = getDateSet3();
		subTitle="VC++教程";
		}
		//String title = subTitle + "图书的销售情况";
//-------------------------生成图片分割线---------------------
		//生成柱状图
		JFreeChart chart = ChartFactory.createBarChart (
				"图书销售统计表",     //图表标题
				"月份",             //目录轴的显示标签
				"销量",             //数值轴的显示标签
				dataset,      //数据
				//PlotOrientation.HORIZONTAL, //图表方向水平
				PlotOrientation.VERTICAL,    //图表方向垂直
				false,             //是否显示图例
				false,            //是否显示工具提示
				false             //是否生成URL
		);
		//设置标题及标题字体
		chart.setTitle(new TextTitle("<<"+subTitle+">>销售统计图",new Font("黑体",Font.ITALIC,22)));
		//建一个图例
		//LegendTitle legendTitle = chart.getLegend(0);
		//设置图例字体
		//legendTitle.setItemFont(new Font("宋体",Font.BOLD,14));
		//获取柱状图plot对象
		CategoryPlot plot = (CategoryPlot) chart.getPlot();
		//设置柱型的颜色
		plot.getRenderer().setSeriesPaint(0, Color.blue);
		//取得横轴
		CategoryAxis categoryAxis = plot.getDomainAxis();
		//设置横轴的字体
		categoryAxis.setLabelFont(new Font("宋体",Font.BOLD,22));
		//设置分类标签以45度倾斜
		//categoryAxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45);
		//设置分类标签字体
		categoryAxis.setTickLabelFont(new Font("宋体",Font.BOLD,22));
		//取得纵轴
		NumberAxis numberAxis = (NumberAxis) plot.getRangeAxis();
		//设置纵轴的字体
		numberAxis.setLabelFont(new Font("宋体",Font.BOLD,22));
		//设置背景透明度（0~1）
		plot.setBackgroundAlpha(0.9f);
		
		return chart; 
		
	}
//------------------------提供数据分割线--------------------
	private static DefaultCategoryDataset getDateSet4() {
		System.out.println("c++");
		//提供生成柱形图的数据
		DefaultCategoryDataset dataset = new DefaultCategoryDataset();
		dataset.addValue(47,"c++教程", "06年10月");
		dataset.addValue(60,"c++教程", "06年11月");
		dataset.addValue(20,"c++教程","06年12月" );
		dataset.addValue(50,"c++教程","07年1月");
		return dataset;
	}
	private static DefaultCategoryDataset getDateSet1() {
		System.out.println("java");
		//提供生成柱形图的数据
		DefaultCategoryDataset dataset1 = new DefaultCategoryDataset();
		dataset1.addValue(47,"JAVA教程", "06年10月");
		dataset1.addValue(23,"JAVA教程", "06年11月");
		dataset1.addValue(20,"JAVA教程","06年12月" );
		dataset1.addValue(10,"JAVA教程", "07年1月");
		return dataset1;
	}
	private static DefaultCategoryDataset getDateSet2() {
		System.out.println("C#");
		//提供生成柱形图的数据
		DefaultCategoryDataset dataset2 = new DefaultCategoryDataset();
		dataset2.addValue(27,"C#教程", "06年10月");
		dataset2.addValue(23,"C#教程", "06年11月");
		dataset2.addValue(40,"C#教程","06年12月" );
		dataset2.addValue(70,"C#教程", "07年1月");
		return dataset2;
	}
	private static DefaultCategoryDataset getDateSet3() {
		System.out.println("VC++");
		//提供生成柱形图的数据
		DefaultCategoryDataset dataset3 = new DefaultCategoryDataset();
		dataset3.addValue(48,"VC++教程", "06年10月");
		dataset3.addValue(63,"VC++教程", "06年11月");
		dataset3.addValue(29,"VC++教程","06年12月" );
		dataset3.addValue(49,"VC++教程","07年1月");
		return dataset3;
	}

	public void setServletRequest(HttpServletRequest request) {
		this.request = request;
	}
}

3.struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
    <constant name="struts.action.extension" value="do,action"/>
    <package name="first" extends="struts-default" namespace="/first"> 
    	<action name="chart" class="com.cs.struts2.helloworld.ChartAction" method="getChart">
    		<result name="first">first.jsp</result>
    	</action>
    </package>
    
    <package name="b" namespace="/first" extends="jfreechart-default">
    	<action name="bchart"  class="com.cs.struts2.helloworld.ChartActionB">
    		<result type="chart">
    			<param name="width">700</param>
    			<param name="height">400</param>
    		</result>
    	</action>
    </package>
</struts>

4.first.jsp

<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
 <P ALIGN="CENTER">
     <s:property value="mapMessage" escape="false"/>
  <img src="<s:property value='src'/>" border=0 usemap="#map0">
 </P> 

5.web.xml

<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>/servletDisplayChart</url-pattern>
  </servlet-mapping>