JFreeChart_LineChart

package com.jfreechart; import java.awt.Color; import java.awt.Font; import java.io.FileOutputStream; import java.io.IOException; import java.util.Random; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartUtilities; import org.jfree.chart.JFreeChart; import org.jfree.chart.axis.CategoryAxis; import org.jfree.chart.axis.CategoryLabelPositions; import org.jfree.chart.axis.NumberAxis; import org.jfree.chart.labels.StandardCategoryItemLabelGenerator; import org.jfree.chart.plot.CategoryPlot; import org.jfree.chart.plot.PlotOrientation; import org.jfree.chart.renderer.category.LineAndShapeRenderer; import org.jfree.chart.title.TextTitle; import org.jfree.data.category.DefaultCategoryDataset; /** * * @ClassName: JFreeChart_LineChart * @author xialong * @date Jan 25, 2011 5:30:04 PM * @Description: * JFreeChart生成折线图 */ public class JFreeChart_LineChart { public static void main(String[] arg){ try { print(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } /** * 输出图片 * @throws IOException */ public static void print() throws IOException{ FileOutputStream fos = new FileOutputStream("D://jfreechart//LineChart"+System.currentTimeMillis()+".jpg"); ChartUtilities.writeChartAsJPEG(fos,//输出到那个流， 1, //图片质量，0~1 getJFreeChart(), //图表对象 800,//宽 600,//高 null//ChartRenderingInfo信息 ); fos.close(); } /** * 产生JFreeChart对象 * * @return */ public static JFreeChart getJFreeChart() { JFreeChart imgChart=null; // JFreeChart对象 参数：标题，目录轴显示标签，数值轴显示标签，数据集，是否显示图例，是否生成工具，是否生成URL连接 //平面 imgChart = ChartFactory.createLineChart("", "X轴", "Y轴", getDataSet(), PlotOrientation.VERTICAL, true, true, false); //3D // imgChart = ChartFactory.createLineChart3D("", "X轴", "Y轴", // getDataSet(), PlotOrientation.VERTICAL, true, true, false); imgChart.setBackgroundPaint(Color.white); imgChart.setBorderVisible(true);// 边框可见 TextTitle title = new TextTitle("测试曲线图", new Font("宋体", Font.BOLD, 20)); // 解决曲线图片标题中文乱码问题 imgChart.setTitle(title); //解决图表底部中文乱码问题 imgChart.getLegend().setItemFont(new Font("宋体", Font.PLAIN, 12)); CategoryPlot categoryplot = (CategoryPlot) imgChart.getPlot(); categoryplot.setBackgroundPaint(Color.lightGray); categoryplot.setRangeGridlinePaint(Color.white); // Y轴 NumberAxis numberaxis = (NumberAxis) categoryplot.getRangeAxis(); setNumberAxis(numberaxis); // x轴 CategoryAxis domainAxis = (CategoryAxis) categoryplot.getDomainAxis(); setDomainAxis(domainAxis); LineAndShapeRenderer lineandshaperenderer = (LineAndShapeRenderer) categoryplot .getRenderer();// 数据点 // series 点（即数据点）可见 lineandshaperenderer.setBaseShapesVisible(true); // 显示数据点的数据 lineandshaperenderer .setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator()); // 显示折线图点上的数据 lineandshaperenderer.setBaseItemLabelsVisible(true); return imgChart; } /** * 设置X轴 * @param domainAxis */ private static void setDomainAxis(CategoryAxis domainAxis){ // 解决x轴坐标上中文乱码 domainAxis.setTickLabelFont(new Font("sans-serif", Font.PLAIN, 11)); // 解决x轴标题中文乱码 domainAxis.setLabelFont(new Font("宋体", Font.PLAIN, 14)); // 用于显示X轴刻度 domainAxis.setTickMarksVisible(true); //设置X轴45度 domainAxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45); } /** * 设置Y轴 * @param numberAxis */ private static void setNumberAxis(NumberAxis numberaxis){ numberaxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits()); // 是否显示零点 numberaxis.setAutoRangeIncludesZero(true); numberaxis.setAutoTickUnitSelection(false); // 解决Y轴标题中文乱码 numberaxis.setLabelFont(new Font("sans-serif", Font.PLAIN, 14)); // numberaxis.setTickUnit(new NumberTickUnit(10000));//Y轴数据间隔 } /** * 产生数据源 * * @return */ private static DefaultCategoryDataset getDataSet() { DefaultCategoryDataset defaultcategorydataset = new DefaultCategoryDataset(); int i = 0; Random rand = new Random(); while (i < 3) { for (int j = 1; j < 10; j++) { defaultcategorydataset.addValue(rand.nextInt(10), "series" + i, "x轴"+j); } i++; } return defaultcategorydataset; } }

 

输入图片如下：