Jfreechart与Tapestry4.0 结合实现(下)

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5)Java类文件:
    5-1)StatChartServic.java类:

java 代码

package com.ce.jfreechart.service;

import java.awt.Color;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

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

import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.engine.IEngineService;
import org.apache.tapestry.engine.ILink;
import org.apache.tapestry.services.Infrastructure;
import org.apache.tapestry.services.LinkFactory;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PiePlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
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.urls.StandardPieURLGenerator;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.data.general.DefaultPieDataset;
import org.jfree.data.time.Day;
import org.jfree.data.time.Hour;
import org.jfree.data.time.Minute;
import org.jfree.data.time.Month;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.ui.RectangleInsets;
import com.ce.jfreechart.vo.PieChartVO;

/**
 * 功能描述：生成统计结果图的服务类（现主要针对胼图）
 */
public class StatChartService implements IEngineService {
    private HttpServletRequest request;

    private HttpServletResponse response;

    private LinkFactory linkFactory;

    private Infrastructure infrastructure;

    private final static String SERVICE_NAME = "chart";

    public final static String CHART_PARAS_OBJ_NAME = "pcVo";

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

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

    public void setLinkFactory(LinkFactory linkFactory) {
        this.linkFactory = linkFactory;
    }

    public ILink getLink(boolean post, Object parameter) {
        Map parameters = new HashMap();
        return linkFactory.constructLink(this, post, parameters, false);
    }

    public void setInfrastructure(Infrastructure infrastructure) {
        this.infrastructure = infrastructure;
    }

    public String getName() {
        return SERVICE_NAME;
    }

    public void service(IRequestCycle cycle) throws IOException {
        PieChartVO pcVo = (PieChartVO) request.getSession()
                .getAttribute(CHART_PARAS_OBJ_NAME);
        if (pcVo == null) {
            return;
        }

        Chart chart = new Chart();

        try {
            chart.getPieChart3D(request, response, pcVo);
        } finally {
            request.getSession().removeAttribute(CHART_PARAS_OBJ_NAME);
        }
    }
}

/**
 * 功能描述：输出JFreeChart图的类
 */
class Chart {

    /**
     * 方法描述：生成3D胼状图的方法
     *
     * @param request
     *            ：HttpServletRequest
     * @param response
     *            ：HttpServletResponse
     * @param PieChartVO
     *            ：参数传递vo
     * @throws IOException
     */
    public void getPieChart3D(HttpServletRequest request,
            HttpServletResponse response, PieChartVO pcVo) throws IOException {
        response.setDateHeader("Expires", 0);
        response.setContentType("image/jpeg");

        String title = pcVo.getTitle();

        String[] name = pcVo.getName();

        double[] value = pcVo.getValue();

        int width = pcVo.getWidth();

        int hight = pcVo.getHight();

        if (title == null || "".equals(title)) {
            title = " ";
        }
        if (name == null || name.length == 0 || value == null
                || value.length == 0) {
            return;
        }
        if (width <= 0) {
            width = 400;
        }
        if (hight <= 0) {
            hight = 400;
        }

        DefaultPieDataset defaultpiedataset = new DefaultPieDataset();
        int j = name.length <= value.length ? name.length : value.length;
        for (int i = 0; i < j; i++) {
            defaultpiedataset.setValue(name[i], value[i]);
        }

        JFreeChart chart = ChartFactory.createPieChart3D(title,
                defaultpiedataset, true, true, false);

        chart.setBackgroundPaint(Color.WHITE);
        PiePlot plot = (PiePlot) chart.getPlot();
        plot.setNoDataMessage("No data available");
        ChartUtilities.writeChartAsJPEG(response.getOutputStream(), chart,
                width, hight);
    }

}

PieChartPage.java页面类

java 代码

package com.ce.jfreechart.page;

import javax.servlet.http.HttpServletRequest;

import org.apache.tapestry.annotations.InjectObject;
import org.apache.tapestry.event.PageBeginRenderListener;
import org.apache.tapestry.event.PageEvent;

import com.ce.jfreechart.service.StatChartService;
import com.ce.jfreechart.vo.PieChartVO;

/**
 * 功能描述：公司人员统计页
 */
public abstract class PieChartPage extends org.apache.tapestry.html.BasePage implements PageBeginRenderListener{
    private final String title  = "公司人员统计饼状图";

    @InjectObject("service:tapestry.globals.HttpServletRequest)
    public abstract HttpServletRequest getRequest();

    /**
     * 页面开始表现时触发，或form重表现时也会触发
    */
    public void pageBeginRender(PageEvent event) {

        if (!event.getRequestCycle().isRewinding()) {
            try{

                //画饼图
                String[] name = {"管理人员","市场人员","开发人员","OEM人员","其他人员"};
                double[] value = {10.02D,20.23D,56.80D,12.30D,5.98D};
                PieChartVO pcVo = new PieChartVO();
                pcVo.setTitle(title);
                pcVo.setName(name);
                pcVo.setValue(value);
                pcVo.setWidth(450);
                pcVo.setHight(300);
                if(this.getRequest().getSession().getAttribute(StatChartService.CHART_PARAS_OBJ_NAME)==null)
                    this.getRequest().getSession().setAttribute(StatChartService.CHART_PARAS_OBJ_NAME, pcVo);
            }catch(Exception e){
                e.printStackTrace();
            }
        }
    }
}

参数Vo对象:

java 代码

/**
 * 功能描述：生成JFreeChart饼图的参数Vo对象
 */
public class PieChartVO implements Serializable {

    private static final long serialVersionUID = 1L;

    /**
     * 图表标题
     */
    private String title;

    /**
     * 具体项名称数组
     */
    private String[] name;

    /**
     * 具体项值数组
     */
    private double[] value;

    /**
     * 图表宽度
     */
    private int width;

    /**
     * 图表高度
     */
    private int hight;

    方法略......
}

PieChart.html页面文件

xml 代码

>
<html>
  <head>
    <title>PieChart.htmltitle>

    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="this is my page">
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">



  head>

  <body>

              <div align="center"><img src="app?service=chart" border="0"/>div>
  body>
html>

PieChart.page文件

xml 代码

xml version="1.0" encoding="GBK"?>

  "-//Apache Software Foundation//Tapestry Specification 4.0//EN"
  "http://jakarta.apache.org/tapestry/dtd/Tapestry_4_0.dtd">

<page-specification class="com.ce.jfreechart.page.PieChartPage">
page-specification>