JFreeChart 生成 折线图（Struts2 + Maven3 + JFreeChart）
接上一篇随笔 JFreeChart 生成 柱状图 ，环境及其配置不变，只是将生成柱状图的核心类 CylinderAction 替换成 CurveAction，让 CurveAction来负责折线图的生成，看下代码：
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 折线图 * @作者 fancy * @邮箱 [email protected] * @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产品销售量", "", "", 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; }}
将 cylinder.jsp 拷贝一份名字改成 curve.jsp，其余不变，访问：http://localhost:8080/jfreechart-demo/curve.html 的结果如图示：
在上图中，可以看出年度A产品的大概走势，但并没有具体的数据值，为使折线上的数据点的数值能够被显示出来，下面在 CurveAction 类中添加代码：
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 折线图 * @作者 fancy * @邮箱 [email protected] * @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产品销售量", "", "", 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(); //设置曲线是否显示数据点 xylineandshaperenderer.setBaseShapesVisible(true); //设置曲线显示各数据点的值 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(); //距离上边距边框距离 rangeAxis.setUpperMargin(0.3); //距离下边框边距距离 rangeAxis.setLowerMargin(0.5); ValueAxis domainAxis = plot.getDomainAxis(); // 左边距 边框距离 domainAxis.setLowerMargin(0.05); // 右边距 边框距离,防止最后边的一个数据靠近了坐标轴。 domainAxis.setUpperMargin(0.1); fileName = ServletUtilities.saveChartAsPNG(chart, 500, 300, null, getHttpSession()); return "curve"; } public String getFileName() { return fileName; }}
OK，再次访问的结果如图示：
[ 转载出处：http://www.blogjava.net/fancydeepin ]