Jfreechart与Tapestry4.0 结合实现(下)-优快云博客

本文介绍了一个使用Java和JFreeChart库生成3D饼图的示例，包括服务类、页面类及参数VO对象的实现细节。

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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();
}
}
}
}