用jfreechart在JSP页面显示点状分布图+分割线（转载：http://blog.csdn.net/ami121/article/details/2450945）-阿里云开发者社区

用jfreechart在JSP页面显示点状分布图+分割线（转载：http://blog.csdn.net/ami121/article/details/2450945）

2017-04-17 1713

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简介： JSP页面 <%@ page language="java" pageEncoding="gbk"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort

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 >

< base href = " <%=basePath%> " >

< 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 >

< 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]);

}

XYSeries xyseries2=new XYSeries("BCompany");

xyCollection.addSeries(xyseries1);

//分布点状图

JFreeChart chart=ChartFactory.createScatterPlot("电压电流图", "电流","电压", xyCollection, PlotOrientation.VERTICAL, true, false, false);

XYPlot plot=(XYPlot) chart.getPlot();

ValueMarker vmarker=new ValueMarker(230d);//设置分割线

vmarker.setLabel("平均电压230V");

vmarker.setLabelPaint(Color.black);

vmarker.setPaint(Color.red);

vmarker.setLabelFont(new Font("隶书",Font.PLAIN,10));

vmarker.setLabelAnchor(RectangleAnchor.BOTTOM_RIGHT);

vmarker.setLabelTextAnchor(TextAnchor.TOP_RIGHT);

plot.addRangeMarker(vmarker);

ValueMarker xMarker=new ValueMarker(12.50d);

xMarker.setLabel("平均电流12.50A");

xMarker.setPaint(Color.orange);

xMarker.setLabelFont(new Font("隶书",Font.BOLD,10));

xMarker.setLabelAnchor(RectangleAnchor.BOTTOM_RIGHT);

xMarker.setLabelTextAnchor(TextAnchor.BOTTOM_RIGHT);

plot.addDomainMarker(xMarker);

plot.setRangeGridlinePaint(Color.black);//设置X轴的颜色

ValueAxis yAxis=plot.getRangeAxis();

yAxis.setAutoRange(true);

yAxis.setAutoRangeMinimumSize(50.0d);

NumberAxis yNumber=(NumberAxis) plot.getRangeAxis();

yNumber.setTickUnit(new NumberTickUnit(50d));

yAxis.setLowerBound(50.0d);

plot.setRangeAxis(yAxis);

ValueAxis xAxis=plot.getDomainAxis();

xAxis.setAutoRange(false);

NumberAxis numberaxis=(NumberAxis)plot.getDomainAxis();

numberaxis.setTickUnit(new NumberTickUnit(0.1D));//设置X轴跨度每次增加1

xAxis.setUpperBound(14.2d);

xAxis.setLowerBound(11.8d);

XYItemRenderer itRender=plot.getRenderer();

try {

PrintWriter pw=new PrintWriter(out);

StandardEntityCollection sec = new StandardEntityCollection();

ChartRenderingInfo info = new ChartRenderingInfo(sec);

filename=ServletUtilities.saveChartAsJPEG(chart,650, 400,null, session);

ChartUtilities.writeImageMap(pw, filename,info, true);

} catch (Exception e) {

e.printStackTrace();

}

return filename;

}

效果图

用jfreechart在JSP页面显示点状分布图+分割线（转载：http://blog.csdn.net/ami121/article/details/2450945）

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