Friends,
I am in a problem.
I want to write message log .
For that I am using Random access file.
I want outout on the JSP.
My JSP file is
<%@ page import="java.io.*,java.lang.*" %>
<%@ page import="p1.*"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> </TITLE>
</HEAD>
<BODY>
<jsp:useBean id="r1" class="p1.RandomFileFinal" scope="session" />
<form name="dataView" method= "post" action = "fileView.jsp">
<%
boolean eofsw=false;
out.println("Reading...");
String b="";
try{
if(!eofsw){
out.println("Entered the if..");
b=r1.readData(0,4);
out.println(b);
out.println("<br>");
}
}
catch(Exception e){
out.println("Error in the file");
}
%>
</form>
</BODY>
</HTML>
And Java File is
package p1;
import java.io.*;
public class RandomFileFinal
{
public void writeData1(String type, String origin, String msg)
{
byte b=0;
long maxsize = 500;
String hdrMsg="0|0|0|*";
String str="";
byte dtlMsg[] = new byte[20];
byte hdrData[] = new byte[30];
RandomAccessFile rs= null;
String sub[] = new String[4];
int l=0,k=0,i=0;
long hdrSize =0;
long remHdr =0,remDetail=0;
int cur=0;
try{
rs= new RandomAccessFile("c:/FileLog.dat","rw");
if ( rs.length()==0){
rs.writeBytes(hdrMsg);
}
else{
rs.seek(0);
while(true){
b=rs.readByte();
char c = (char)b;
if (c=='*')
{
hdrSize = rs.getFilePointer();
remHdr=30-hdrSize;
break;
}
str+=c;
}
while(l<str.length()){
k = str.indexOf("|",l);
sub[i] = str.substring(l,k);
l=k+1;
i++;
}
long l1 = rs.length();
sub[1]=String.valueOf(l1);
cur = Integer.parseInt(sub[2]);
if (cur==99){
cur= 0;
}
else{
cur++;
}
sub[2]=String.valueOf(cur);
rs.setLength(maxsize);
hdrMsg=String.valueOf(maxsize)+"|"+sub[1].trim()+"
|"+sub[2].trim()+"|*";
hdrData= hdrMsg.getBytes();
rs.seek(0);
rs.write(hdrData);
rs.seek(0);
rs.skipBytes(30+cur*20);
type+=origin.trim()+msg.trim();
dtlMsg =type.getBytes();
rs.write(dtlMsg);
rs.close();
}
}
catch(IOException e){
System.out.println("Error in Write Data and in the file
cration");
//rs.close();
}
}
public String readData(int start, int end)
{
int cur=0;
byte b=0;
int i=0,j =0;
String dataRet ="";
boolean eofsw = true;
String str="";
System.out.println(start);
byte[] data = new byte[20];
try{
RandomAccessFile rs= null;
long hdrSize =0;
rs= new RandomAccessFile("c:/FileLog.dat","r");
rs.seek(0);
char tests;
rs.seek(0);
rs.skipBytes(30+(start*20));
while(eofsw){
str="";
if(start >= end ){
break;
}
try{
for(j = 0; j<=2000;j++){
tests= (char)rs.readByte();
System.out.print(tests);
str+=tests;
}
start++;
System.out.println(str);
}
catch(EOFException eof){
eofsw = false;
System.out.println("This is Error ");
}
rs.close();
return(str);
}
}catch(IOException ie){
System.out.println("Can't open the File ");
}
return(null);
}
}
My problem is I am not getting out put record by record it is comming in
the one string.
Please help me
Thanks in advance
Snehal
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