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Simple picture counters can also be implemented in Java

Source: Internet
Author: User
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Using Java to implement a simple picture of the counter, run diagram:

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<%@ page contenttype= "text/html;charset=gb2312"%>
<%@ page language= "java" import= "java.io.*"%>
<meta http-equiv= "Content-type" content= "text/html; charset=gb2312 ">
<title> counters </title>

<%!
Synchronizing Update counters

synchronized void counter () {

ServletContext Application=getservletcontext (); Constructing application objects (optional)

String Szpath=application.getrealpath ("/"); Get current path

szpath=szpath+ "Hits.txt"; Counter file 0-9999999999999 ...

String szrecord= ""; Count String

int nrecord=0; Count int

try{

BufferedReader file=new BufferedReader (New FileReader (szpath));

Szrecord=file.readline (); Read Counter file

}

catch (Exception e) {

System.out.println (e);

}

if (szrecord==null) {

szrecord= "0"; If the counter file is empty

}

Nrecord=java.lang.integer.parseint (Szrecord) +1; Counter +1

try{

File F=new file (szpath);

PrintWriter pw=new PrintWriter (new FileWriter (f));

Pw.print (Nrecord); Write the file. This method of frequently writing files to save the count is undesirable.

Pw.close ();

}

catch (Exception e) {

System.out.println (e);

}

}

%>

<%

Display counter
if (Session.isnew ()) {//If it is a new session
Counter ();
}
String Path=application.getrealpath ("/");
Out.println (Path);
String szpath=path+ "Hits.txt";
String szrecord= "";
BufferedReader file=new BufferedReader (New FileReader (szpath));
try{
Szrecord=file.readline ();
if (szrecord==null) {
szrecord= "0";
}
}
catch (Exception e) {
System.out.println (e);
}
Displaying a 7-bit digital GIF image
String szout= "<body topmargin= ' 0 ' leftmargin= ' 0 ' > Current traffic:";
int i=0;
int K=7-szrecord.length (); Number of "0"
for (i=0;i<k;i++) {//display "0"
szout=szout+ "}
For (I=0;i<szrecord.length (); i++) {//Show non-"0"
szout=szout+ "}
szout=szout+ "</body>";
Out.println (szout);
%>

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Counters for simple pictures are also available in Java

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