JFreeChart+sql

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SQL jfreechart JDBC Swing Servlet

<%@ page contentType="text/html;charset=GBK"%>
<%@ page import =" java.awt.*,
java.text.SimpleDateFormat,
javax.swing.JPanel,
org.jfree.chart.ChartFactory,
org.jfree.chart.ChartPanel,
org.jfree.chart.JFreeChart,
org.jfree.chart.axis.DateAxis,
org.jfree.chart.plot.XYPlot,
org.jfree.chart.renderer.xy.XYItemRenderer,
org.jfree.chart.renderer.xy.XYLineAndShapeRenderer,
org.jfree.data.time.*,
org.jfree.data.time.TimeSeries,
org.jfree.data.time.TimeSeriesCollection,
org.jfree.data.xy.XYDataset"%>
<%@ page import="org.jfree.chart.servlet.ServletUtilities"%>
<%@ page import="java.util.*"%>
<%@ page import = "org.jfree.ui.RectangleInsets"%>
<%@ page import = "java.sql.*"%>
<jsp:directive.page import="org.jfree.chart.axis.CategoryAxis"/>
<jsp:directive.page import="org.jfree.chart.axis.ValueAxis"/>
<html>
<%
//连接数据库
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver").newInstance();
String url="jdbc:sqlserver://localhost:1433;DataBaseName=database_name";
String usr="sa";
String pwd="sa";
Connection conn=DriverManager.getConnection(url,usr,pwd);
Statement stmt=conn.createStatement();
String sql="select * from jfree order by id";
ResultSet rs=stmt.executeQuery(sql);

//设置曲线，共三条曲线
TimeSeries timeseries = new TimeSeries("平均",Minute.class);//时间的最小单位为分，线值名是“平均”
TimeSeries timeseries1 = new TimeSeries("usl",Minute.class);
TimeSeries timeseries2 = new TimeSeries("lsl",Minute.class);

//从数据库中取值，数据和时间
while(rs.next())
{
float y0=rs.getFloat("lengthavg");
float y1=rs.getFloat("lengthusl");
float y2=rs.getFloat("lengthlsl");
String s=rs.getString("addtime");
//从yyyyMMddHHmm时间格式的char中取出年月日小时分设为int值
//int x=Integer.parseInt(s.substring(0,4)); //截取年
//int y=Integer.parseInt(s.substring(5,6)); //截取月
//int z=Integer.parseInt(s.substring(6,7)); //截取日
//int a=Integer.parseInt(s.substring(8,10));
//int b=Integer.parseInt(s.substring(11,12));

int x=Integer.parseInt(s.substring(0,4)); //截取年
int y=Integer.parseInt(s.substring(5,7)); //截取月
int z=Integer.parseInt(s.substring(8,10)); //截取时间
int a=Integer.parseInt(s.substring(11,13));
int b=Integer.parseInt(s.substring(14,16));

out.print(x+"年");
out.print(y+"月");
out.print(z+"日");
out.print(a+"小时");
out.print(b+"分钟");
out.print("<br>");
timeseries.add(new Minute(b,new Hour(a,new Day(z,y,x))),y0);
timeseries1.add(new Minute(b,new Hour(a,new Day(z,y,x))),y1);
timeseries2.add(new Minute(b,new Hour(a,new Day(z,y,x))),y2);

}

//连接曲线
TimeSeriesCollection dataset = new TimeSeriesCollection();
dataset.addSeries(timeseries);
dataset.addSeries(timeseries1);
dataset.addSeries(timeseries2);
dataset.setDomainIsPointsInTime(true);

//设置曲线图
XYDataset xydataset = (XYDataset) dataset;
JFreeChart chart = ChartFactory.createTimeSeriesChart(
"走势图",
"时间",
"值",
xydataset,
true,
true,
true
);
Font font = new Font("微软雅黑",Font.CENTER_BASELINE,12);
chart.getTitle().setFont(font); //设置标题字体
chart.getLegend().setItemFont(font); //设置下标题字体
chart.setBackgroundPaint(Color.white);//设置曲线图背景色

XYPlot plot = (XYPlot) chart.getPlot();
//CategoryAxis domainaxis = plot.getDomainAxis();
ValueAxis numberaxis = plot.getRangeAxis();

//domainaxis.setTickLabelFont(font); //设置X轴坐标上和文字
//domainaxis.setLabelFont(font); //设置X轴的标题文字
//numberaxis.setTickLabelFont(font); //设置Y轴坐标上的文字
numberaxis.setLabelFont(font); //设置Y轴的标题文字
XYLineAndShapeRenderer xylineandshaperenderer = (XYLineAndShapeRenderer)plot.getRenderer();
plot.setBackgroundPaint(Color.white);//设置网格背景颜色
plot.setDomainGridlinePaint(Color.pink);//设置网格竖线颜色
plot.setRangeGridlinePaint(Color.pink);//设置网格横线颜色
plot.setAxisOffset(new RectangleInsets(0D, 0D, 0D, 10D));//设置曲线图与xy轴的距离，即曲线与xy轴贴近的距离
xylineandshaperenderer.setBaseShapesVisible(true);//设置曲线是否显示数据点

String filename = ServletUtilities.saveChartAsPNG(chart, 500, 300, null, session);
String graphURL = request.getContextPath() + "/servlet/DisplayChart?filename=" + filename;
%>
<img src="<%= graphURL %>" border=0 usemap="#<%= filename %>">

数据库表
id int,
lengthavg float,
lengthusl float,
lengthlsl float,
addtime datatime

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