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[原]Struts2-整合JFreeChart

[標題]:[原]Struts2-整合JFreeChart
[時間]:2009-9-3
[摘要]:JFreeChart
[關鍵字]:浪曦視頻，Struts2應用開發系列，WebWork，Apache
[環境]:struts-2.1.6、JDK6、MyEclipse7、Tomcat6
[作者]:Winty (wintys@gmail.com) http://www.aygfsteel.com/wintys

[正文]:
1、JFreeChart入門
JFreeChart網站:www.jfree.org。需要下載jfreechart和jcommon(JFreeChart依賴于jcommon)。JCommon的文檔和源代碼需要單獨下載。使用時將jfreechart.jar和jcommon.jar加到構建路徑中。

a. 餅圖(Swing)

/StrutsHelloWorld/src/wintys/jfreechart/PieChart.java:

package wintys.jfreechart;
import java.awt.Font;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartFrame;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PiePlot;
import org.jfree.data.general.DefaultPieDataset;
/**
* 餅狀圖
* @author Winty (wintys@gmail.com)
* @version 2009-8-31
* @see http://wintys.blogjava.net
*/
public class PieChart {

   public static void main(String[] args) {
       ChartFrame frame = new ChartFrame("My JFreeChart Demo",getChart());
       frame.setVisible(true);
       frame.setSize(600 , 400);
   }

   public static JFreeChart getChart(){
       DefaultPieDataset dpd = new DefaultPieDataset();
       dpd.setValue("計算機", 200);
       dpd.setValue("電子", 150);
       dpd.setValue("經管", 50);
       dpd.setValue("外語", 198);

       JFreeChart chart
//           = ChartFactory.createPieChart("院系人數", dpd, true, true,false);
           = ChartFactory.createPieChart3D("院系人數", dpd, true, true,true);

       //需要設置字體，否則中文無法顯示
       Font font = new Font("宋體" , Font.PLAIN , 20);
       chart.getTitle().setFont(font);
       chart.getLegend().setItemFont(font);
       PiePlot piePlot = (PiePlot)chart.getPlot();
       piePlot.setLabelFont(font);

       return chart;
   }
}

b. 柱狀圖(Swing)

/StrutsHelloWorld/src/wintys/jfreechart/BarChart.java:

package wintys.jfreechart;
import java.awt.Font;
import javax.swing.JPanel;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.CategoryLabelPositions;
import org.jfree.chart.axis.ValueAxis;
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 org.jfree.ui.ApplicationFrame;

/**
* 柱狀圖
*
* @author Winty (wintys@gmail.com)
* @version 2009-8-31
* @see http://wintys.blogjava.net
*/
@SuppressWarnings("serial")
public class BarChart extends ApplicationFrame {
   public BarChart(String title) {
       super(title);
       setContentPane(createPanel());
       setSize(800, 600);
       setVisible(true);
   }

   public static void main(String[] args) {
       new BarChart("水果產量圖");
   }

   private static CategoryDataset createDataset() {
       DefaultCategoryDataset dcd = new DefaultCategoryDataset();
       dcd.addValue(100, "北京", "蘋果");
       dcd.addValue(70, "上海", "蘋果");
       dcd.addValue(120, "廣州", "蘋果");
       dcd.addValue(220, "北京", "梨子");
       dcd.addValue(260, "上海", "梨子");
       dcd.addValue(300, "廣州", "梨子");
       dcd.addValue(320, "北京", "葡萄");
       dcd.addValue(370, "上海", "葡萄");
       dcd.addValue(320, "廣州", "葡萄");
       dcd.addValue(490, "北京", "香蕉");
       dcd.addValue(450, "上海", "香蕉");
       dcd.addValue(400, "廣州", "香蕉");
       dcd.addValue(200, "北京", "荔枝");
       dcd.addValue(230, "上海", "荔枝");
       dcd.addValue(340, "廣州", "荔枝");

       return dcd;
   }

   /**
   * default getChart() method using default dataset
   * @return
   */
   public static JFreeChart getChart() {
       return getChart(createDataset());
   }

   public static JFreeChart getChart(CategoryDataset cd){
       JFreeChart chart = ChartFactory.createBarChart3D("", "水果", "產量", cd,
               PlotOrientation.VERTICAL, true, true, false);

       /*不設置字體，漢字會亂碼*/
       Font font = new Font("宋體", Font.BOLD, 20);
       chart.setTitle(new TextTitle("水果產量圖", font));
       chart.getTitle().setFont(font);
       chart.getLegend().setItemFont(font);

       CategoryPlot plot = (CategoryPlot) chart.getPlot();
       CategoryAxis categoryAxis = plot.getDomainAxis();
       categoryAxis.setLabelFont(font);
       categoryAxis.setTickLabelFont(font);

       ValueAxis valueAxis = plot.getRangeAxis();
       valueAxis.setLabelFont(font);

       categoryAxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45);

       return chart;
   }

   private JPanel createPanel() {

       return new ChartPanel(getChart());
   }
}

c. 輸出圖片

/StrutsHelloWorld/src/wintys/jfreechart/OutputChart.java:

package wintys.jfreechart;
import java.io.File;
import java.io.IOException;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;

/**
* 將JFreeChart圖片輸出到文件
* @author Winty (wintys@gmail.com)
* @version 2009-9-1
* @see http://wintys.blogjava.net
*/
public class OutputChart {
   public static void main(String[] args) {
       File file = new File("D:/temp.jpg");
       JFreeChart chart = BarChart.getChart();
       final int width = 400;
       final int height = 400;

       try {
           ChartUtilities.saveChartAsJPEG(file, chart, width, height);
       } catch (IOException e) {
           e.printStackTrace();
       }
   }
}

d. 在Servlet中使用JFreeChart
ServletUtilities.saveChartAsPNG();//生成文件在Tomcat temp下

/StrutsHelloWorld/src/wintys/jfreechart/DisplayChartServlet.java:

package wintys.jfreechart;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;

@SuppressWarnings("serial")
public class DisplayChartServlet extends HttpServlet {

   public void doGet(HttpServletRequest request, HttpServletResponse response)
           throws ServletException, IOException {

       JFreeChart chart;
       int width;
       int height;
       String type = request.getParameter("type");

       if ("pie".equalsIgnoreCase(type)) {
           chart = PieChart.getChart();// pie
           width = 600;
           height = 400;
       } else {
           chart = BarChart.getChart();// bar
           width = 800;
           height = 600;
       }

       response.setContentType("image/png");
       ChartUtilities.writeChartAsPNG(response.getOutputStream(), chart,
               width, height);
       /*
          //存為臨時圖片，然后輸出
          String image = ServletUtilities.saveChartAsPNG(chart,600, 400, request.getSession());
          ServletUtilities.sendTempFile(image, response);
          System.out.println("Image:" + image);
          System.out.println(System.getProperty("java.io.tmpdir"));
       */
   }

   public void doPost(HttpServletRequest request, HttpServletResponse response)
           throws ServletException, IOException {

       doGet(request, response);
   }
}

web.xml中的配置:

<servlet>
   <servlet-name>DisplayChartServlet</servlet-name>
   <servlet-class>wintys.jfreechart.DisplayChartServlet</servlet-class>
</servlet>
<servlet-mapping>
   <servlet-name>DisplayChartServlet</servlet-name>
   <url-pattern>/jfreechart/DisplayChartServlet</url-pattern>
</servlet-mapping>

/StrutsHelloWorld/WebRoot/jfreechart/JFreeChartDisplayChart.jsp:

<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <title></title>
</head>
   <body>
這是JFreeChart生成的柱狀圖:
<br />
<img src="/StrutsHelloWorld/jfreechart/DisplayChartServlet?type=bar" />
<hr/>
   <br />
這是餅圖:<br/>
<img src="/StrutsHelloWorld/jfreechart/DisplayChartServlet?type=pie" />
</body>
</html>

e. JFreeChart自帶的顯示圖形的Servlet:DisplayChart
org.jfree.chart.servlet.DisplayChart 與以上編寫的wintys.jfreechart.DisplayChartServlet原理相似。

在web.xml中的配置:

<servlet>
   <servlet-name>JFreeChartDisplayChart</servlet-name>
   <servlet-class>org.jfree.chart.servlet.DisplayChart</servlet-class>
</servlet>
<servlet-mapping>
   <servlet-name>JFreeChartDisplayChart</servlet-name>
   <url-pattern>/servlet/DisplayChart</url-pattern>
</servlet-mapping>

/StrutsHelloWorld/WebRoot/jfreechart/JFreeChartDisplayChart.jsp:

<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
<%@ page import = "wintys.jfreechart.BarChart" %>
<%@ page import = "org.jfree.chart.JFreeChart" %>
<%@ page import = "org.jfree.chart.servlet.ServletUtilities" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title></title>
</head>
<body>
org.jfree.chart.servlet.DisplayChart使用:
<br />
<%
JFreeChart chart = BarChart.getChart();
String filename = ServletUtilities.saveChartAsPNG(chart , 800 , 600 , session);

String url = request.getContextPath();
String imageurl = url + "/servlet/DisplayChart?filename=" + filename;
%>
<img src="<%=imageurl%>" />
</body>
</html>

2、Struts2整合JFreeChart
在Struts2中整合JFreeChart需要把struts中的JFreeChart Plugin.jar復制到構建路徑中。其實JFreeChart Plugin只是提供了一個org.apache.struts2.dispatcher.ChartResult，用于在Struts中方便地顯示圖形。

/StrutsHelloWorld/WebRoot/jfreechart/StrutsJFreeChart.jsp:

<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
<%@taglib uri="/struts-tags" prefix="s"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <title></title>
</head>
    <body>
<s:form action="jfreechart" namespace="/mystruts">
   <s:checkbox name="interests" fieldValue="football" label="足球" labelposition="left"/>
   <s:checkbox name="interests" fieldValue="basketball" label="籃球"/>
   <s:checkbox name="interests" fieldValue="baseball" label="棒球" />
   <s:submit name="submit" value="提交"></s:submit>
</s:form>
   <img alt="" src="/StrutsHelloWorld/mystruts/jfreechart.action" />
</body>
</html>

注意:
   a). <s:checkbox />中應該使用fieldValue屬性而不是value作為值。
   b). 還可應用如下方法添加checkbox: <s:checkboxlist list="#{'value' : 'label' , "math":"數學"} "/>

struts.xml配置:
<struts>
   ......
    <include file="struts-myjfreechart.xml" />
   ......
</struts>

struts-myjfreechart.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>
    <package name="MyStrutsJFreeChart" extends="jfreechart-default" namespace="/mystruts">
        <action name="jfreechart" class="wintys.jfreechart.ChartAction">
           <result name="success" type="chart">
               <param name="width">800</param>
               <param name="height">600</param>
           </result>
       </action>
    </package>
</struts>

/StrutsHelloWorld/src/wintys/jfreechart/ChartAction.java:

package wintys.jfreechart;
import java.awt.Font;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.CategoryLabelPositions;
import org.jfree.chart.axis.ValueAxis;
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.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
/**
* JFreeChart Struts Plugin
* @author Winty (wintys@gmail.com)
* @version 2009-9-2
* @see http://wintys.blogjava.net
*/
@SuppressWarnings("serial")
public class ChartAction extends ActionSupport {
   private List<String> interests;

   public List<String> getInterests() {
       return interests;
   }

   public void setInterests(List<String> interests) {
       this.interests = interests;
   }

   /**
   * 記錄interest信息
   */
   private void addInterests(){
       ActionContext context = ActionContext.getContext();
       Map<String , Object> application = context.getApplication();

       if(interests == null)return;
       Iterator<String> it = interests.iterator();
       while(it.hasNext()){
           String interest = it.next();
           addValue(application , interest);
       }
   }

   /**
   * 在application中保存數據
   */
   private void addValue(Map<String , Object> application , String key){
       if(key == null)
           return;
       int value = getValue(application , key) + 1;

       application.put(key, value);
   }

   /**
   * 從application中獲取數據。如果key不存在,則返回0。
   */
   private int getValue(Map<String , Object> application , String key){
       int value = 0;

       Object obj = application.get(key);
       if( obj != null){
           value = ((Integer)obj).intValue();
       }

       return value;
   }

   /**
   * for JFreeChart
   * @return org.jfree.chart.JFreeChart
   */
   public JFreeChart getChart(){
       JFreeChart chart = getChart(createDataset());

       return chart;
   }

   private CategoryDataset createDataset(){
       ActionContext context = ActionContext.getContext();
       Map<String , Object> application = context.getApplication();

       DefaultCategoryDataset dcd = new DefaultCategoryDataset();
       dcd.addValue(getValue(application , "football"), "" , "足球");
       dcd.addValue(getValue(application , "basketball"), "" , "籃球");
       dcd.addValue(getValue(application , "baseball"), "" , "棒球");

       return dcd;
   }

   private static JFreeChart getChart(CategoryDataset cd){
       JFreeChart chart = ChartFactory.createBarChart3D("", "球類", "興趣", cd,
               PlotOrientation.VERTICAL, true, true, false);

       /*不設置字體，漢字會亂碼*/
       Font font = new Font("宋體", Font.BOLD, 20);
       chart.setTitle(new TextTitle("興趣統計圖", font));
       chart.getTitle().setFont(font);
       chart.getLegend().setItemFont(font);

       CategoryPlot plot = (CategoryPlot) chart.getPlot();
       CategoryAxis categoryAxis = plot.getDomainAxis();
       categoryAxis.setLabelFont(font);
       categoryAxis.setTickLabelFont(font);

       ValueAxis valueAxis = plot.getRangeAxis();
       valueAxis.setLabelFont(font);

       categoryAxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45);

       return chart;
   }

   @Override
   public String execute() throws Exception {
       addInterests();//統計interest數據

       return SUCCESS;
   }
}

結果:

[參考資料]:
    [1]《浪曦視頻之Struts2應用開發系列》
   [2] struts2整合jfreechart : http://zyongking.javaeye.com/blog/443980
   [3] Struts JFreeChart Plugin : http://struts.apache.org/2.x/docs/jfreechart-plugin.html

[附件]:
    源代碼 : http://www.aygfsteel.com/Files/wintys/StrutsHelloWorld_jfreechart.zip

posted on 2009-09-03 17:10 天堂露珠閱讀(2458) 評論(0) 編輯收藏所屬分類: Struts

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