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org.jfree.chart.ChartFactory ÓÉËüÀ´²úÉú JFreeChart ¶ÔÏó
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org.jfree.chart.plot.Plot ͨ¹ýJFreeChart ¶ÔÏó»ñµÃËü£¬È»ºóÔÙͨ¹ýËü¶ÔͼÐÎÍⲿ²¿·Ö£¨Àý£º×ø±êÖᣩµ÷Õû
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package com.lzk.bean;
import java.awt.Color;
import java.awt.Font;
import java.io.IOException;
import java.io.PrintWriter;
import java.text.NumberFormat;
import java.text.SimpleDateFormat;
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.axis.DateAxis;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.entity.StandardEntityCollection;
import org.jfree.chart.labels.StandardXYToolTipGenerator;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.
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} catch (IOException e) {
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