应用JFreeChart创建折线图
使用JFreeChart创建折线图
package com.cs.jfreechart; import java.awt.Color; import java.awt.Font; import java.io.FileOutputStream; import java.io.IOException; 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.NumberAxis; import org.jfree.chart.plot.CategoryPlot; import org.jfree.chart.plot.PlotOrientation; import org.jfree.chart.title.TextTitle; import org.jfree.data.category.CategoryDataset; import org.jfree.data.category.DefaultCategoryDataset; public class LineChartDemo { /** * @param args * @throws IOException */ public static void main(String[] args) throws IOException { //生成折线图 JFreeChart chart = ChartFactory.createLineChart ( "图书销售统计表", //图表标题 "图书", //目录轴的显示标签 "销量", //数值轴的显示标签 getDateSet(), //数据 //PlotOrientation.HORIZONTAL, //图表方向水平 PlotOrientation.VERTICAL, //图表方向垂直 false, //是否显示图例 false, //是否显示工具提示 false //是否生成URL ); //设置标题及标题字体 chart.setTitle(new TextTitle("图书销售统计图",new Font("黑体",Font.ITALIC,22))); //建一个图例 //LegendTitle legendTitle = chart.getLegend(0); //设置图例字体 //legendTitle.setItemFont(new Font("宋体",Font.BOLD,14)); //获取折线图plot对象 CategoryPlot plot = (CategoryPlot) chart.getPlot(); //设置折线的颜色 plot.getRenderer().setSeriesPaint(0, Color.blue); //取得横轴 CategoryAxis categoryAxis = plot.getDomainAxis(); //设置横轴的字体 categoryAxis.setLabelFont(new Font("宋体",Font.BOLD,22)); //设置分类标签以45度倾斜 //categoryAxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45); //设置分类标签字体 categoryAxis.setTickLabelFont(new Font("宋体",Font.BOLD,22)); //取得纵轴 NumberAxis numberAxis = (NumberAxis) plot.getRangeAxis(); //设置纵轴的字体 numberAxis.setLabelFont(new Font("宋体",Font.BOLD,22)); //设置背景透明度(0~1) plot.setBackgroundAlpha(0.9f); //输出文件 FileOutputStream fos = new FileOutputStream("book.jpg"); //用ChartUtilities工具输出 ChartUtilities.writeChartAsJPEG(fos, chart, 800, 600); fos.close(); } private static CategoryDataset getDateSet() { //提供生成折线图的数据 DefaultCategoryDataset dataset = new DefaultCategoryDataset(); dataset.addValue(47,"","JAVA教程"); dataset.addValue(23,"","c++教程"); dataset.addValue(20,"","C#教程"); dataset.addValue(10,"","VC++教程"); return dataset; } }