JavaWeb实现图形报表折线图的方法
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2023-11-13 15:39:22
本文实例讲述了javaweb实现图形报表折线图的方法。分享给大家供大家参考,具体如下:
步骤说明:
1. 导入log4j.jar,jfreechart-0.9.18.j...
本文实例讲述了javaweb实现图形报表折线图的方法。分享给大家供大家参考,具体如下:
步骤说明:
1. 导入log4j.jar,jfreechart-0.9.18.jar,jdom.jar,jcommon-0.9.3.jar四个jar包
2. 在某个包中写入tuxin.java类
package com.mengya.util; import java.awt.color; import java.awt.font; import java.io.printwriter; import javax.servlet.http.httpsession; import org.jfree.chart.chartfactory; import org.jfree.chart.chartrenderinginfo; import org.jfree.chart.chartutilities; import org.jfree.chart.jfreechart; import org.jfree.chart.standardlegend; import org.jfree.chart.axis.numberaxis; import org.jfree.chart.entity.standardentitycollection; import org.jfree.chart.plot.categoryplot; import org.jfree.chart.plot.plotorientation; import org.jfree.chart.renderer.lineandshaperenderer; import org.jfree.chart.servlet.servletutilities; import org.jfree.data.defaultcategorydataset; public class line { private defaultcategorydataset dataset = new defaultcategorydataset(); public void setvalue(int sum, string line, string wfield) { dataset.addvalue(sum, line, wfield); } public string generatelinechart(string title,string wfield, string hfield, httpsession session, printwriter pw,int wphoto,int hphoto) { string filename = null; try { final jfreechart chart = chartfactory.createlinechart ( title, // 图表标题 wfield, // 横轴的显示标签 hfield, // 纵轴的显示标签 dataset, //数据集 plotorientation.vertical, // 图表方向:水平、垂直 true, // 是否显示图例 true, // 是否生成提示工具 tooltips false // 是否生成url链接 ); standardlegend legend = (standardlegend) chart.getlegend();//生成图例 legend.setdisplayseriesshapes(true);//显示图例形状 legend.setshapescalex(1.5);//设置图例x轴的大小 legend.setshapescaley(1.5);//设置图例y轴的大小 legend.setdisplayserieslines(true);//显示图示项的横线 //设置图片的背景色 chart.setbackgroundpaint(new java.awt.color(189,235,255)); categoryplot plot = (categoryplot) chart.getplot(); plot.setbackgroundpaint(new color(239,251,255));//生成图片中墙体的背景色 plot.setrangegridlinepaint(color.black);//生成图片中格子线的颜色 // 没有数据时显示的消息 plot.setnodatamessage("没有相关统计数据"); plot.setnodatamessagefont(new font("黑体", font.center_baseline, 16)); plot.setnodatamessagepaint(color.red); numberaxis rangeaxis = (numberaxis) plot.getrangeaxis(); rangeaxis.setstandardtickunits(numberaxis.createintegertickunits());//设置图中的刻度线的单位 rangeaxis.setautorangeincludeszero(true);//强制在自动选择的数据范围中包含0 lineandshaperenderer renderer = (lineandshaperenderer) plot.getrenderer(); renderer.setdrawshapes(true);//折线的数据点根据分类使用不同的形状 renderer.setitemlabelsvisible(true);//显示每个点上的数据值的提示工具,数据标签是否可见 chartrenderinginfo info = new chartrenderinginfo(new standardentitycollection()); //500是图片长度,300是图片高度 filename = servletutilities.savechartaspng(chart, wphoto, hphoto, info, session); chartutilities.writeimagemap(pw, filename, info); pw.flush(); } catch(exception e) { e.printstacktrace(); } return filename; } }
3. 配置web.xml,在web.xml中添加如下内空:
<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>/displaychart</url-pattern> </servlet-mapping>
4. 在要显示图片的jsp中添加内容:
<%@ page language="java" import="java.util.*,com.mengya.util.line,com.mengya.bean.stubean" pageencoding="gbk"%> <%@page import="java.io.printwriter;"%> <!doctype html public "-//w3c//dtd html 4.01 transitional//en"> <html> <head> <title>折线图</title> </head> <body> <% line tt = new line(); //第一条折线 list ar = (arraylist) request.getattribute("arr1"); for (int i = 0; i < ar.size(); i++) { stubean bean = (stubean) ar.get(i); tt.setvalue((int) bean.gets_money(), "张明学个人消费比例图", bean.gets_month()+ ""); } //条二条折线 ar = (arraylist) request.getattribute("arr2"); for (int i = 0; i < ar.size(); i++) { stubean bean = (stubean) ar.get(i); tt.setvalue((int) bean.gets_money(), "梦娅个人消费比例图", bean.gets_month()+ ""); } //说明:tt.setvalue(int a,string b,string c) //其中的第二个参数b是该条折线的名字,每条折线的名字最好不要一样. string filename = tt.generatelinechart("个人消费比例图", "月 份", "费 用", session, new printwriter(out), 800, 550); string graphurl = request.getcontextpath() + "/displaychart?filename=" + filename; %> <p align="center"> <img src="<%=graphurl %>" width=800 height=550 border=1 usemap="#<%=filename%>"> </body> </html>
希望本文所述对大家jsp程序设计有所帮助。