Nelson的部落格: 在Struts2中使用JFreeChart

1.在Struts2中，並沒有將JFreeChart包含進來，若要在Struts2中使用JFreeChart則需以PlugIn方式引進來。

下載範例(Study.war)
1.1.首先下載JFreeChart PlugIn並將其置放於WEB-INF\lib目錄下
下載JFreeChart PlugIn(struts2-jfreechart-plugin-2.0.11.jar)
1.2.下載JFreeChart Jar(jfreechart-1.0.13.jar，jcommon-1.0.16.jar)檔並將此兩個檔案置於WEB-INF\lib目錄下
下載JFreeChart Jar(jfreechart-1.0.13.jar，jcommon-1.0.16.jar)

1.3.將chart之result type加入於struts.xml內容如下：

 <package name="Chart" namespace="/chart" extends="struts-default"><result-types>
<result-type name="chart" class="org.apache.struts2.dispatcher.ChartResult"></result-type>
</result-types>   <action name="viewModerationChart" class="study.ViewModerationChart">
<result name="success" type="chart">
 <param name="width">400</param>
 <param name="height">300</param>
</result>
</action>
<action name="viewModerationChartDispatcher">
<result name="success" type="dispatcher">/ViewModerationChartDispatcher.jsp</result>
</action>
</package>

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2.編輯呈現JFreeChart圖形之對應Action(ViewModerationChart.java)


package study;




import org.jfree.chart.JFreeChart;

import org.jfree.chart.axis.NumberAxis;

import org.jfree.chart.plot.XYPlot;

import org.jfree.chart.renderer.xy.StandardXYItemRenderer;

import org.jfree.data.xy.XYSeries;

import org.jfree.data.xy.XYSeriesCollection;

import org.jfree.chart.axis.ValueAxis;

import com.opensymphony.xwork2.ActionSupport;

import java.util.Random;




public class ViewModerationChart extends ActionSupport {

 private JFreeChart chart;

    public String execute() throws Exception {

        // chart creation logic...

        XYSeries dataSeries = new XYSeries(new Integer(1)); //pass a key for this serie

        for (int i = 0; i <= 100; i++) {

            dataSeries.add(i, new Random().nextInt());

        }

        XYSeriesCollection xyDataset = new XYSeriesCollection(dataSeries);




        ValueAxis xAxis = new NumberAxis("Raw Marks");

        ValueAxis yAxis = new NumberAxis("Moderated Marks");




        // set my chart variable

        chart =

            new JFreeChart(

                "Moderation Function",

                JFreeChart.DEFAULT_TITLE_FONT,

                new XYPlot(

                    xyDataset,

                    xAxis,

                    yAxis,

                    new StandardXYItemRenderer(StandardXYItemRenderer.LINES)),

                false);

        chart.setBackgroundPaint(java.awt.Color.white);




        return super.SUCCESS;

    }




    public JFreeChart getChart() {

        return chart;

    }

}





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3.在JSP中呈現JFreeChart圖形(ViewModerationChartDispatcher.jsp)






<%@ page contentType="text/html; charset=UTF-8" %>

<%@ taglib prefix="s" uri="/struts-tags" %>

<html>

<head>

<title>ViewModerationChartDispatcher page</title>

</head>

<body>

 <center><h2>Moderation Chart:</h2>

 <img src="chart/viewModerationChart.action"><br/>

 </center>

 <input type="button" value="上一頁" onclick="javascript:history.go(-1)">

 


 <s:debug/>

</body>

</html>


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測試結果：