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 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 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 ]

posted on 2013-12-31 13:48 午后星期午阅读(108) 评论(0) 编辑收藏所属分类: JavaEE

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