接上一篇隨筆 JFreeChart 生成 柱狀圖 ，環境及其配置不變，只是將生成柱狀圖的核心類 CylinderAction 替換成 CurveAction，讓 CurveAction來負責折線圖的生成，看下代碼：
package com.fancy.action;
import java.awt.Color;
import java.text.SimpleDateFormat;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.servlet.ServletUtilities;
import org.jfree.data.time.Month;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
/**
* -----------------------------------------
* @描述 折線圖
* @作者 fancy
* @郵箱 fancydeepin@yeah.net
* @日期 2012-8-7 <p>
* -----------------------------------------
*/
public class CurveAction extends BaseAction{
private static final long serialVersionUID = 1L;
private String fileName;
public String execute() throws Exception{
TimeSeries series2010 = new TimeSeries("2010年度", Month.class);
TimeSeries series2011 = new TimeSeries("2011年度", Month.class);
TimeSeriesCollection dataset = new TimeSeriesCollection();
series2010.add(new Month(1, 2011), 36);
series2010.add(new Month(2, 2011), 84);
series2010.add(new Month(3, 2011), 202);
series2010.add(new Month(4, 2011), 183);
series2010.add(new Month(5, 2011), 172);
series2010.add(new Month(6, 2011), 107);
series2010.add(new Month(7, 2011), 200);
series2010.add(new Month(8, 2011), 87);
series2010.add(new Month(9, 2011), 250);
series2010.add(new Month(10, 2011), 152);
series2010.add(new Month(11, 2011), 235);
series2010.add(new Month(12, 2011), 266);
series2011.add(new Month(1, 2011), 156);
series2011.add(new Month(2, 2011), 216);
series2011.add(new Month(3, 2011), 118);
series2011.add(new Month(4, 2011), 250);
series2011.add(new Month(5, 2011), 257);
series2011.add(new Month(6, 2011), 253);
series2011.add(new Month(7, 2011), 355);
series2011.add(new Month(8, 2011), 300);
series2011.add(new Month(9, 2011), 103);
series2011.add(new Month(10, 2011), 250);
series2011.add(new Month(11, 2011), 348);
series2011.add(new Month(12, 2011), 325);
dataset.addSeries(series2010);
dataset.addSeries(series2011);
JFreeChart chart = ChartFactory.createTimeSeriesChart("A產品銷售量", "", "", dataset, true, true, false);
DateAxis dateaxis = (DateAxis)chart.getXYPlot().getDomainAxis();
dateaxis.setDateFormatOverride(new SimpleDateFormat("MM月"));
chart.setBackgroundPaint(Color.WHITE);
fileName = ServletUtilities.saveChartAsPNG(chart, 500, 300, null, getHttpSession());
return "curve";
}
public String getFileName() {
return fileName;
}
}
將 cylinder.jsp 拷貝一份名字改成 curve.jsp，其余不變，訪問：http://localhost:8080/jfreechart-demo/curve.html 的結果如圖示：
在上圖中，可以看出年度A產品的大概走勢，但并沒有具體的數據值，為使折線上的數據點的數值能夠被顯示出來，下面在 CurveAction 類中添加代碼：
package com.fancy.action;
import java.awt.Color;
import java.awt.Font;
import java.text.SimpleDateFormat;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.labels.ItemLabelAnchor;
import org.jfree.chart.labels.ItemLabelPosition;
import org.jfree.chart.labels.StandardXYItemLabelGenerator;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYItemRenderer;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.chart.servlet.ServletUtilities;
import org.jfree.data.time.Month;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.ui.TextAnchor;
/**
* -----------------------------------------
* @描述 折線圖
* @作者 fancy
* @郵箱 fancydeepin@yeah.net
* @日期 2012-8-7 <p>
* -----------------------------------------
*/
public class CurveAction extends BaseAction{
private static final long serialVersionUID = 1L;
private String fileName;
public String execute() throws Exception{
TimeSeries series2010 = new TimeSeries("2010年度", Month.class);
TimeSeries series2011 = new TimeSeries("2011年度", Month.class);
TimeSeriesCollection dataset = new TimeSeriesCollection();
series2010.add(new Month(1, 2011), 36);
series2010.add(new Month(2, 2011), 84);
series2010.add(new Month(3, 2011), 202);
series2010.add(new Month(4, 2011), 183);
series2010.add(new Month(5, 2011), 172);
series2010.add(new Month(6, 2011), 107);
series2010.add(new Month(7, 2011), 200);
series2010.add(new Month(8, 2011), 87);
series2010.add(new Month(9, 2011), 250);
series2010.add(new Month(10, 2011), 152);
series2010.add(new Month(11, 2011), 235);
series2010.add(new Month(12, 2011), 266);
series2011.add(new Month(1, 2011), 156);
series2011.add(new Month(2, 2011), 216);
series2011.add(new Month(3, 2011), 118);
series2011.add(new Month(4, 2011), 250);
series2011.add(new Month(5, 2011), 257);
series2011.add(new Month(6, 2011), 253);
series2011.add(new Month(7, 2011), 355);
series2011.add(new Month(8, 2011), 300);
series2011.add(new Month(9, 2011), 103);
series2011.add(new Month(10, 2011), 250);
series2011.add(new Month(11, 2011), 348);
series2011.add(new Month(12, 2011), 325);
dataset.addSeries(series2010);
dataset.addSeries(series2011);
JFreeChart chart = ChartFactory.createTimeSeriesChart("A產品銷售量", "", "", dataset, true, true, false);
DateAxis dateaxis = (DateAxis)chart.getXYPlot().getDomainAxis();
dateaxis.setDateFormatOverride(new SimpleDateFormat("MM月"));
chart.setBackgroundPaint(Color.WHITE);
XYPlot plot = (XYPlot)chart.getPlot();
XYLineAndShapeRenderer xylineandshaperenderer = (XYLineAndShapeRenderer)plot.getRenderer();
//設置曲線是否顯示數據點
xylineandshaperenderer.setBaseShapesVisible(true);
//設置曲線顯示各數據點的值
XYItemRenderer xyitem = plot.getRenderer();
xyitem.setBaseItemLabelsVisible(true);
xyitem.setBasePositiveItemLabelPosition(new ItemLabelPosition(ItemLabelAnchor.OUTSIDE12, TextAnchor.BASELINE_LEFT));
xyitem.setBaseItemLabelGenerator(new StandardXYItemLabelGenerator());
xyitem.setBaseItemLabelFont(new Font("Dialog", 1, 14));
plot.setRenderer(xyitem);
ValueAxis rangeAxis = plot.getRangeAxis();
//距離上邊距邊框距離
rangeAxis.setUpperMargin(0.3);
//距離下邊框邊距距離
rangeAxis.setLowerMargin(0.5);
ValueAxis domainAxis = plot.getDomainAxis();
// 左邊距 邊框距離
domainAxis.setLowerMargin(0.05);
// 右邊距 邊框距離,防止最后邊的一個數據靠近了坐標軸。
domainAxis.setUpperMargin(0.1);
fileName = ServletUtilities.saveChartAsPNG(chart, 500, 300, null, getHttpSession());
return "curve";
}
public String getFileName() {
return fileName;
}
}
OK，再次訪問的結果如圖示：
posted on 2012-08-07 12:00
fancydeepin 閱讀(2672)
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