Example of a graphical counter

Import java.io.*;


import java.util.*;


import com.sun.image.codec.jpeg.*;


import javax.servlet.*;


import javax.servlet.http.*;





import java.awt.*;


import java.awt.image.*;


public class Jpegservlet extends HttpServlet {





private String strfile= "C:count.txt";


Private font mfont=new font ("Courier", font.bold,12);





public void doget (httpservletrequest request,httpservletresponse response)


throws Servletexception,ioexception {





String S;


Int intcount;


S=getcount ();


intcount=new Integer (s). Intvalue ();


intcount=intcount+1;


Writecount (intcount+ "");





Response.setcontenttype ("Image/jpeg");


Servletoutputstream Out=response.getoutputstream ();


bufferedimage image=new bufferedimage (110,16,BUFFEREDIMAGE.TYPE_INT_RGB);


Graphics g=image.getgraphics ();


G.setcolor (Color.Black);


G.fillrect (0,0,110,16);


G.setcolor (Color.White);


G.setfont (Mfont);





Char C;


for (int i=0;i<10;i++) {


C=s.charat (i);


g.drawstring (c+ "", i*11+1,12);


g.drawline (i+1) *11-1,0, (i+1) *11-1,16);


}





JPEGImageEncoder Encoder=jpegcodec.createjpegencoder (out);


Encoder.encode (image);


Out.close ();


}





public void DoPost (httpservletrequest request,httpservletresponse response)


throws Servletexception,ioexception {





doget (Request,response);


}





public synchronized void Writecount (String content) {


try {


PrintWriter pw = new PrintWriter (new FileOutputStream (strfile));


pw.println (content);


Pw.close ();


} catch (IOException e) {


System.out.println ("Write File Error:" +e.getmessage ());


}


}





Public synchronized String GetCount () {


String Strcount;


int len;


int Leftlen;





try {


BufferedReader inf = new BufferedReader (new FileReader (strfile));


Strcount=inf.readline ();


Inf.close ();


} catch (Exception e) {


System.out.println ("Get counter Error:" +e.getmessage ());


return Rechar (' 0 ', 10);


}


len=strcount.length ();


if (len<=0) {


return Rechar (' 0 ', 10);


}





if (len>10) {


return Rechar (' 9 ', 10);


}





Leftlen=10-len;


return Rechar (' 0 ', Leftlen) +strcount;


}





Private String Rechar (char c,int num) {


int i;


if (num<=0) return "";


String s= "";


for (i=0;i<num;i++) {


S=s+c;


}


return s;


}


}