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。
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