使用 jfreechart 生成曲线、柱状图、饼状图、分布图展示到JSP-2

2024-02-17 17:11:22
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柱状分布统计图：

package com.xidian.servlet;
import java.awt.Color;
import java.awt.Font;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
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.renderer.category.BarRenderer;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.category.DefaultCategoryDataset;
/**
 * 柱状分布统计图
 * @说明 
 * @author cuisuqiang
 * @version 1.0
 * @since
 */
@SuppressWarnings("serial")
public class ParagraphsServlet extends HttpServlet {
 protected void service(HttpServletRequest request,
   HttpServletResponse response) throws ServletException, IOException {
  response.setContentType("text/html");
  DefaultCategoryDataset dataTime = new DefaultCategoryDataset();
  // 这是一组数据
  dataTime.addValue(52, "0-6", "2010-1-1");
  dataTime.addValue(86, "6-12", "2010-1-1");
  dataTime.addValue(126, "12-18", "2010-1-1");
  dataTime.addValue(42, "18-24", "2010-1-1");
  // 这是一组数据
  dataTime.addValue(452, "0-6", "2010-1-2");
  dataTime.addValue(96, "6-12", "2010-1-2");
  dataTime.addValue(254, "12-18", "2010-1-2");
  dataTime.addValue(126, "18-24", "2010-1-2");
  // 这是一组数据
  dataTime.addValue(256, "0-6", "2010-1-3");
  dataTime.addValue(86, "6-12", "2010-1-3");
  dataTime.addValue(365, "12-18", "2010-1-3");
  dataTime.addValue(24, "18-24", "2010-1-3");
  try {
   DefaultCategoryDataset data = dataTime;
   // 使用ChartFactory创建3D柱状图，不想使用3D，直接使用createBarChart
   JFreeChart chart = ChartFactory.createBarChart3D(
     "网站时间段访问量统计", 
     "时间", 
     "访问量", 
     data,
     PlotOrientation.VERTICAL, 
     true, 
     false, 
     false
   );
   // 设置整个图片的背景色
   chart.setBackgroundPaint(Color.PINK);
   // 设置图片有边框
   chart.setBorderVisible(true);
   Font kfont = new Font("宋体", Font.PLAIN, 12);    // 底部
   Font titleFont = new Font("宋体", Font.BOLD, 25); // 图片标题
   // 图片标题
   chart.setTitle(new TextTitle(chart.getTitle().getText(), titleFont));
   // 底部
   chart.getLegend().setItemFont(kfont);
   // 得到坐标设置字体解决乱码
   CategoryPlot categoryplot = (CategoryPlot) chart.getPlot();
   categoryplot.setDomainGridlinesVisible(true);
   categoryplot.setRangeCrosshairVisible(true);
   categoryplot.setRangeCrosshairPaint(Color.blue);
   NumberAxis numberaxis = (NumberAxis) categoryplot.getRangeAxis();
   numberaxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
   BarRenderer barrenderer = (BarRenderer) categoryplot.getRenderer();
   barrenderer.setBaseItemLabelFont(new Font("宋体", Font.PLAIN, 12));
   barrenderer.setSeriesItemLabelFont(1, new Font("宋体", Font.PLAIN, 12));
   CategoryAxis domainAxis = categoryplot.getDomainAxis();   
   /*------设置X轴坐标上的文字-----------*/
   domainAxis.setTickLabelFont(new Font("sans-serif", Font.PLAIN, 11));
   /*------设置X轴的标题文字------------*/
   domainAxis.setLabelFont(new Font("宋体", Font.PLAIN, 12));
   /*------设置Y轴坐标上的文字-----------*/
   numberaxis.setTickLabelFont(new Font("sans-serif", Font.PLAIN, 12));
   /*------设置Y轴的标题文字------------*/
   numberaxis.setLabelFont(new Font("宋体", Font.PLAIN, 12));
   /*------这句代码解决了底部汉字乱码的问题-----------*/
   chart.getLegend().setItemFont(new Font("宋体", Font.PLAIN, 12)); 
   ChartUtilities.writeChartAsJPEG(response.getOutputStream(), 1.0f,
     chart, 500, 300, null);
  } catch (Exception es) {
   es.printStackTrace();
  }
 }
}

JSP上使用IMG图片来请求Servlet显示图片：

<%@ page language="java" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    <title></title>
 <meta http-equiv="pragma" content="no-cache">
 <meta http-equiv="cache-control" content="no-cache">
 <meta http-equiv="expires" content="0">    
 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
 <meta http-equiv="description" content="This is my page">
  </head>
  <body>
    <center>
     <img src="LineServlet">
     <img src="PillarServlet">
     <img src="ParagraphsServlet">
     <img src="CakeServlet">
    </center>
  </body>
</html>

WEB.xml配置：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
 http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
 <filter>
  <filter-name>EncodingFilter</filter-name>
  <filter-class>org.filter.EncodingFilter</filter-class>
 </filter>
 <filter-mapping>
  <filter-name>EncodingFilter</filter-name>
  <url-pattern>/*</url-pattern>
 </filter-mapping>
 <servlet>
  <servlet-name>LineServlet</servlet-name>
  <servlet-class>com.xidian.servlet.LineServlet</servlet-class>
 </servlet>
 <servlet>
  <servlet-name>PillarServlet</servlet-name>
  <servlet-class>com.xidian.servlet.PillarServlet</servlet-class>
 </servlet>
 <servlet>
  <servlet-name>ParagraphsServlet</servlet-name>
  <servlet-class>
   com.xidian.servlet.ParagraphsServlet
  </servlet-class>
 </servlet>
 <servlet>
  <servlet-name>CakeServlet</servlet-name>
  <servlet-class>com.xidian.servlet.CakeServlet</servlet-class>
 </servlet>
 <servlet-mapping>
  <servlet-name>LineServlet</servlet-name>
  <url-pattern>/LineServlet</url-pattern>
 </servlet-mapping>
 <servlet-mapping>
  <servlet-name>PillarServlet</servlet-name>
  <url-pattern>/PillarServlet</url-pattern>
 </servlet-mapping>
 <servlet-mapping>
  <servlet-name>ParagraphsServlet</servlet-name>
  <url-pattern>/ParagraphsServlet</url-pattern>
 </servlet-mapping>
 <servlet-mapping>
  <servlet-name>CakeServlet</servlet-name>
  <url-pattern>/CakeServlet</url-pattern>
 </servlet-mapping>
 <welcome-file-list>
  <welcome-file>index.jsp</welcome-file>
 </welcome-file-list>
</web-app>

为了解决乱码问题，我配置了一个过滤器：

package org.filter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
/**
 * 处理乱码
 * @说明 
 * @author cuisuqiang
 * @version 1.0
 * @since
 */
public class EncodingFilter implements Filter {
 public void destroy() {
 }
 public void doFilter(ServletRequest request, ServletResponse response,
   FilterChain chain) throws IOException, ServletException {
  request.setCharacterEncoding("gbk");
  response.setCharacterEncoding("gbk");
  chain.doFilter(request, response);
 }
 public void init(FilterConfig arg0) throws ServletException {
 }
}

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