snalsgraphservlet.java

这是一个用jsp+Oracle开发的联系人客户关系管理系统！

package com.ideas.servlet;

import javax.servlet.*;
import javax.servlet.http.*;

import Acme.JPM.Encoders.GifEncoder;

// standard imports
import java.awt.image.BufferedImage;
import java.awt.image.ImageObserver;
import java.awt.*;

import java.net.URL;

import java.io.IOException;
import java.io.OutputStream;
import java.io.*;
import javax.imageio.*;
import com.sun.media.imageio.stream.*;

import com.ideas.data.DBAccess;
import com.ideas.util.Configuration;

public class SnalsGraphServlet extends HttpServlet
{
    private static final int RADIUS = 200;
    private static final int WIDTH = 110;
    private static final int HEIGHT = 120;
    private static final int X_RADIUS = 200;
    private static final int Y_RADIUS = 150;

    private static final Color BG_COLOR = new Color(0xffffff);
    private static final Color TEXT_COLOR = new Color(0x000000);
    private static final Color FG_COLOR = new Color(0x6699FF);
    private static final Color BODY_COLOR = new Color(0x6666FF);
    private static final Color GRAPHICS_BG_COLOR = Color.yellow;

    public void service(HttpServletRequest req, HttpServletResponse res) throws
        IOException, ServletException
    {
        res.setContentType("image/gif;charset=gb2312");
        OutputStream out = res.getOutputStream();
        BufferedImage img =
            new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_ARGB);
        Graphics2D g = (Graphics2D)img.getGraphics();

        double total = 100.0;
        String ipaddress = req.getParameter("ipaddress");
        String[] data = DBAccess.getLatestData(
            "select state from snals where ipaddress='" + ipaddress +
            "' order by timestamp desc");


        if(data[0].equals("ACTIVE"))
       {
           g.setColor(Color.GREEN);
           g.drawString("active",0,38);

           int h = 0;
           Polygon ply = new Polygon();
           ply.addPoint(0, 40 + h);
           ply.addPoint(90, 40 + h);
           ply.addPoint(85, 35 + h);
           ply.addPoint(100, 42 + h);
           ply.addPoint(85, 49 + h);
           ply.addPoint(90, 44 + h);
           ply.addPoint(0, 44 + h);
           g.fillPolygon(ply);

       }
       else
       {
           g.setColor(Color.RED);
           int h = 52;
           g.drawString("unactive",0,38 + h);

           Polygon ply = new Polygon();
           ply.addPoint(0, 40 + h);
           ply.addPoint(90, 40 + h);
           ply.addPoint(85, 35 + h);
           ply.addPoint(100, 42 + h);
           ply.addPoint(85, 49 + h);
           ply.addPoint(90, 44 + h);
           ply.addPoint(0, 44 + h);
           g.fillPolygon(ply);

       }

        g.setColor(Color.BLACK);
        g.drawString("当前状态为：", 0, 10);
        g.setComposite(AlphaComposite.getInstance(AlphaComposite.CLEAR, 0.0f));
        GifEncoder ge = new GifEncoder(img, out);
        ge.encode();
        out.close();
    }

    public void init() throws ServletException
    {

    }

}