用jfreechart在JSP页面显示点状分布图+分割线

本文链接：https://blog.youkuaiyun.com/Ami121/article/details/2450945

本文介绍了一个使用JSP、Java及JFreeChart库绘制交互式电压电流图表的例子。该图表展示了两个公司的电压电流数据，并设置了电压和电流的平均值标记线。通过自定义样式和范围，实现了精确的数据展示。

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JSP页面

<%@ page language="java" pageEncoding="gbk"%>

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>

<title>My JSP 'index.jsp' starting page</title>

<jsp:useBean id="barchart01" scope="session"

class="com.ami.chart.SeriesXY" />

</head>

<body>

String fileName = barchart01.getImg(request.getSession(), out);

String graphURL = request.getContextPath()

+ "/servlet/DisplayChart?filename=" + fileName;

<br/>

<img src="<%= graphURL %>" border="0" usemap="#<%=fileName %>" />

<br />

</body>

</html>

WEB.XML

<servlet-name>DisplayChart</servlet-name>

<servlet-class>org.jfree.chart.servlet.DisplayChart</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>DisplayChart</servlet-name>

<url-pattern>/servlet/DisplayChart</url-pattern>

</servlet-mapping>

JAVA实现代码

package com.ami.chart;

import java.awt.BasicStroke;

import java.awt.Color;

import java.awt.Font;

import java.io.PrintWriter;

import javax.servlet.http.HttpSession;

import javax.servlet.jsp.JspWriter;

import org.jfree.chart.ChartFactory;

import org.jfree.chart.ChartRenderingInfo;

import org.jfree.chart.ChartUtilities;

import org.jfree.chart.JFreeChart;

import org.jfree.chart.axis.NumberAxis;

import org.jfree.chart.axis.NumberTickUnit;

import org.jfree.chart.axis.ValueAxis;

import org.jfree.chart.entity.StandardEntityCollection;

import org.jfree.chart.plot.PlotOrientation;

import org.jfree.chart.plot.ValueMarker;

import org.jfree.chart.plot.XYPlot;

import org.jfree.chart.renderer.xy.XYItemRenderer;

import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;

import org.jfree.chart.servlet.ServletUtilities;

import org.jfree.data.xy.XYSeries;

import org.jfree.data.xy.XYSeriesCollection;

import org.jfree.ui.RectangleAnchor;

import org.jfree.ui.TextAnchor;

public class SeriesXY {

public String getImg(HttpSession session ,JspWriter out){

String filename=null;

double []xydata1_0={12.8d,12.3d,12.9d,12.2d,13.3d,12.0d,12.8d,13.3d,12.9d,13.9d,12.3d,12.0d,12.8d,12.3d,11.9d,13.2d,12.3d,14.0d,12.8d,12.3d,12.9d,13.2d,13.3d,14.0d,12.8d,13.3d,11.9d,13.9d,12.3d,12.0d,19.8d,12.3d,14.9d,18.2d,12.3d,14.0d,12.8d,12.3d,12.9d,18.2d,13.3d,14.0d,12.8d,14.3d,12.9d,13.9d,12.3d,12.0d,13.8d,12.3d,11.9d,13.2d,12.3d,14.0d,12.8d,12.3d,12.9d,18.2d,16.3d,18.0d,12.8d,12.3d,19.9d,13.9d,12.3d,12.0d,12.8d,12.3d,12.9d,13.2d,12.3d,14.0d,12.8d,12.3d,12.9d,12.2d,13.3d,12.0d,12.8d,13.3d,12.9d,13.9d};

double []xydata1_1={196.0d,223.0d,230.5d,241.0d,195.8d,200.3d,200.0d,230.0d,243.5d,261.0d,259.8d,245.3d,236.0d,260.0d,225.5d,230.0d,190.8d,205.3d,196.0d,223.0d,230.5d,241.0d,195.8d,200.3d,200.0d,230.0d,243.5d,261.0d,259.8d,245.3d,236.0d,260.0d,225.5d,230.0d,190.8d,205.3d,196.0d,223.0d,230.5d,241.0d,195.8d,200.3d,200.0d,230.0d,243.5d,261.0d,259.8d,245.3d,236.0d,260.0d,225.5d,230.0d,190.8d,205.3d,196.0d,223.0d,230.5d,241.0d,195.8d,200.3d,200.0d,230.0d,243.5d,261.0d,259.8d,245.3d,236.0d,260.0d,225.5d,230.0d,190.8d,205.3d,196.0d,223.0d,230.5d,241.0d,195.8d,200.3d,200.0d,230.0d,243.5d,261.0d};

XYSeriesCollection xyCollection=new XYSeriesCollection();

XYSeries xyseries1=new XYSeries("ACompany");

for(int i=0;i<82;i++){

xyseries1.add(xydata1_0[i], xydata1_1[i]);