chartservlet.java

一个完整的

// Decompiled by DJ v2.9.9.60 Copyright 2000 Atanas Neshkov  Date: 2002-12-05 9:36:14
// Home Page : http://members.fortunecity.com/neshkov/dj.html  - Check often for new version!
// Decompiler options: packimports(3) 
// Source File Name:   ChartServlet.java

package cn.com.fcsoft.chart;

import cn.com.fcsoft.chart.jpeg.JpegEncoder;
import java.awt.*;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.StringTokenizer;
import javax.servlet.*;

// Referenced classes of package com.objectplanet.chart:
//            ChartApplet, Chart, BarChartApplet, LineChartApplet, 
//            PieChartApplet

public class ChartServlet extends GenericServlet
{

    public String encodeChartImage(Image image, OutputStream outputstream)
        throws IOException
    {
        if(image != null && outputstream != null)
        {
            JpegEncoder jpegencoder = new JpegEncoder(image, 75, outputstream);
            jpegencoder.Compress();
            outputstream.flush();
        }
        return "image/jpeg";
    }

    public ChartServlet()
    {
    }

    private final boolean hasValidLicense()
    {
        return true;
    }

    protected static Double[] getDoubleValues(String s)
    {
        Double adouble[] = null;
        if(s != null && !s.equals(""))
        {
            StringTokenizer stringtokenizer = new StringTokenizer(s, ",");
            adouble = new Double[stringtokenizer.countTokens()];
            for(int i = 0; i < adouble.length; i++)
                try
                {
                    adouble[i] = new Double(stringtokenizer.nextToken());
                }
                catch(NumberFormatException _ex) { }

        }
        return adouble;
    }

    public synchronized void service(ServletRequest servletrequest, ServletResponse servletresponse)
        throws ServletException, IOException
    {
        Object obj = null;
        String s = servletrequest.getParameter("chart");
        s = s == null ? "bar" : s;
        if(s.equals("bar"))
            obj = barChart;
        else
        if(s.equals("line"))
            obj = lineChart;
        else
        if(s.equals("pie"))
            obj = pieChart;
        if(obj == null)
            return;
        ((ChartApplet) (obj)).theChart.setSize(300, 200);
        ((ChartApplet) (obj)).reset();
        ((ChartApplet) (obj)).setParameter("seriesCount", servletrequest.getParameter("seriesCount"));
        String s1 = servletrequest.getParameter("sampleCount");
        if(s1 == null || s1.trim().length() == 0)
        {
            Double adouble[] = getDoubleValues(servletrequest.getParameter("sampleValues"));
            int i = adouble == null ? 0 : adouble.length;
            int j = ((ChartApplet) (obj)).theChart.getSeriesCount();
            for(int k = 0; k < j; k++)
            {
                Double adouble1[] = getDoubleValues(servletrequest.getParameter("sampleValues_" + k));
                i = adouble1 == null ? i : Math.max(i, adouble1.length);
            }

            ((ChartApplet) (obj)).setParameter("sampleCount", i + "");
        } else
        {
            ((ChartApplet) (obj)).setParameter("sampleCount", s1);
        }
        String s2;
        String s3;
        for(Enumeration enumeration = servletrequest.getParameterNames(); enumeration.hasMoreElements(); ((ChartApplet) (obj)).setParameter(s2, s3))
        {
            s2 = (String)enumeration.nextElement();
            s3 = servletrequest.getParameter(s2);
        }

        ((ChartApplet) (obj)).setParameter("rangeStep", servletrequest.getParameter("rangeStep"));
        ((ChartApplet) (obj)).setParameter("range", servletrequest.getParameter("range"));
        ((ChartApplet) (obj)).setParameter("lowerRange", servletrequest.getParameter("lowerRange"));
        ((ChartApplet) (obj)).setParameter("rangeStep_2", servletrequest.getParameter("rangeStep_2"));
        ((ChartApplet) (obj)).setParameter("range_2", servletrequest.getParameter("range_2"));
        ((ChartApplet) (obj)).setParameter("lowerRange_2", servletrequest.getParameter("lowerRange_2"));
        Dimension dimension = ((ChartApplet) (obj)).theChart.getSize();
        Image image = ((ChartApplet) (obj)).theChart.getImage(dimension.width, dimension.height);
        if(!hasValidLicense())
        {
            Graphics g = image.getGraphics();
            g.setColor(Color.white);
            g.fillRect(0, dimension.height - 8, dimension.width, 8);
            g.setColor(Color.gray);
            g.setFont(new Font("Arial", 0, 9));
            g.drawString("www.fcsoft.com.cn www.fcsoft.com.cn www.fcsoft.com.cn www.fcsoft.com.cn www.fcsoft.com.cn", 0, dimension.height - 2);
        }
        String s4 = encodeChartImage(image, servletresponse.getOutputStream());
        if(s4 != null && s4.length() > 0)
            servletresponse.setContentType(s4);
        else
            servletresponse.setContentType("image");
    }

    public void init(ServletConfig servletconfig)
    {
        try
        {
            super.init(servletconfig);
        }
        catch(ServletException _ex) { }
        barChart = new BarChartApplet();
        lineChart = new LineChartApplet();
        pieChart = new PieChartApplet();
        barChart.init();
        lineChart.init();
        pieChart.init();
    }

    protected BarChartApplet barChart;
    protected LineChartApplet lineChart;
    protected PieChartApplet pieChart;
}