标签:info category 测试 javaweb get 设置字体 comm 时序图 set
1、JFreeChar基础
(1)概念
JFreeChart是一个Java开源项目,它是一款优秀的基于Java的图表开发组件,提供了在Java应用程序和JavaWeb应用程序下生成各种图表的功能,包括柱形图、饼形图、线图、区域图、时序图和多轴图等,这些图表可以JPEG、PNG等格式返回到应用程序中。
(2)部署安装
jfreechart-1.o.13.jar和jcommon-1.o.16.jar两个文件拷贝到Web应用程序的WEB-INF/lib
(3)核心类
2、使用步骤
(1)导包
(2)配置文件
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> <display-name>Jfree</display-name> <welcome-file-list> <welcome-file>index.html</welcome-file> <welcome-file>index.htm</welcome-file> <welcome-file>index.jsp</welcome-file> <welcome-file>default.html</welcome-file> <welcome-file>default.htm</welcome-file> <welcome-file>default.jsp</welcome-file> </welcome-file-list> <servlet> <servlet-name>DisplayChart</servlet-name> <servlet-class>org.jfree.chart.servlet.DisplayChart</servlet-class> </servlet> <servlet-mapping> <servlet-name>DisplayChart</servlet-name> <url-pattern>/chart/DisplayChart</url-pattern> </servlet-mapping> </web-app>
(3)测试程序
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ page import="org.jfree.chart.ChartFactory, org.jfree.chart.JFreeChart, org.jfree.chart.plot.PlotOrientation, org.jfree.chart.servlet.ServletUtilities, org.jfree.data.category.CategoryDataset, org.jfree.data.general.DatasetUtilities, org.jfree.chart.plot.*, org.jfree.chart.labels.*, org.jfree.chart.renderer.category.BarRenderer3D, java.awt.*, org.jfree.ui.*, org.jfree.chart.axis.AxisLocation,org.jfree.chart.title.TextTitle,org.jfree.chart.axis.CategoryAxis,org.jfree.chart.axis.NumberAxis"%> <% //使用数组定义报表数据,即数据集 double[][] data = new double[][] { {22310, 24510, 28390, 28030}, {19168, 21198, 27748, 24002}, {5689, 6289, 7239, 8800}, {3737,3813,3908,4402}}; String[] row = {"一季度", "二季度","三季度", "四季度"}; String[] column = {"北京", "上海", "郑州","开封"}; //为报表填充数据库 CategoryDataset dataset = DatasetUtilities.createCategoryDataset(column,row ,data); //实例化一个3D柱状图 JFreeChart chart = ChartFactory.createBarChart3D("","城市","房价",dataset,PlotOrientation.VERTICAL,true,true,false); //实例化plot对象 CategoryPlot plot = chart.getCategoryPlot(); //设置字体,不然中文将产生乱码 Font font = new Font("宋体", Font.BOLD, 16); //定义标题 TextTitle title = new TextTitle("各城市房价统计图", font); //定义副标题 TextTitle subtitle = new TextTitle("按季度统计", new Font("黑体", Font.BOLD, 12)); //添加副标题和标题 chart.addSubtitle(subtitle); chart.setTitle(title); //设置plot对象的X轴和Y轴 NumberAxis numberaxis = (NumberAxis) plot.getRangeAxis(); CategoryAxis domainAxis = plot.getDomainAxis(); //设置X轴坐标上的文字字体 domainAxis.setTickLabelFont(new Font("sans-serif", Font.PLAIN, 12)); //设置X轴的标题文字字体 domainAxis.setLabelFont(new Font("宋体", Font.PLAIN, 12)); //设置Y轴坐标上的文字字体 numberaxis.setTickLabelFont(new Font("sans-serif", Font.PLAIN, 12)); //设置Y轴的标题文字字体 numberaxis.setLabelFont(new Font("黑体", Font.PLAIN, 12)); //设置栏目文字字体 chart.getLegend().setItemFont(new Font("宋体", Font.PLAIN, 12)); //设置网格背景颜色 plot.setBackgroundPaint(Color.white); //设置网格竖线颜色 plot.setDomainGridlinePaint(Color.BLUE); //设置网格横线颜色 plot.setRangeGridlinePaint(Color.pink); //显示每个柱的数值,并修改该数值的字体属性 BarRenderer3D renderer = new BarRenderer3D(); renderer.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator()); renderer.setBaseItemLabelsVisible(true); //默认的数字显示在柱子中,通过如下两行代码调整数字的显示 //注意:本行代码很重要,否则显示的数字会被覆盖 renderer.setBasePositiveItemLabelPosition(new ItemLabelPosition(ItemLabelAnchor.OUTSIDE12, TextAnchor.BASELINE_LEFT)); renderer.setItemLabelAnchorOffset(10D); //设置每个地区所包含的平行柱的之间距离 plot.setRenderer(renderer); //设置城市 、房价的显示位置 //将下方的“城市 ”放到上方 plot.setDomainAxisLocation(AxisLocation.BOTTOM_OR_RIGHT); //将默认放在左边的“房价”放到右方 plot.setRangeAxisLocation(AxisLocation.TOP_OR_RIGHT); //生成JPG格式的图片 String filename = ServletUtilities.saveChartAsJPEG(chart, 700, 400,null, session); //图片生成的路径及名称 String graphURL = request.getContextPath() + "/chart/DisplayChart?filename=" + filename; %> <!DOCTYPE html> <html> <head> <title>使用JFreeChart生成图表</title> </head> <body> <img src="<%= graphURL %>" width=700 height=400 border=0 usemap="#<%= filename %>"> </body> </html>
标签:info category 测试 javaweb get 设置字体 comm 时序图 set
原文地址:https://www.cnblogs.com/zhai1997/p/13059707.html