String replacer not working ..can any one help me?

[laksh2007]

i want to search and replace strings present in a file (entire file)..
i have wirtten cod eto do this..
but it is not working as expected..

code is :


import java.io.*;
import java.util.*;

public class StringReplacer {

private String replaceString;
private String replacerString;
private String filePath;

public StringReplacer( String replaceString, String replacerString, String filePath)
{
this.replaceStr ing = replaceString;
this.replacerSt ring = replacerString;
this.filePath = filePath;
try
{
replace();
}
catch (Exception ex)
{
}
}

public StringReplacer( )
{

}
private void replace() throws Exception
{
//RandomAccessFil e raf=new RandomAccessFil e(filepath,"rwd ");
File file = new File(filePath);
if(!file.exists ())
{
System.out.prin tln("File doesnot exists");
return;
}

DataInputStream dis = new DataInputStream (new FileInputStream (file));

StringBuffer fileData = new StringBuffer("" );
String strTemp = "";

System.out.prin tln("before while");
while((strTemp = dis.readLine()) != null)
{
//String str=new String();
System.out.prin tln("inside while");
fileData.append (strTemp);
System.out.prin tln(strTemp);
}
System.out.prin tln("after while");


dis.close();

System.out.prin tln("before string tokenizer");
StringTokenizer stTemp = new StringTokenizer (fileData.toStr ing()," ",true);
System.out.prin tln(stTemp);
System.out.prin tln("after string tokenizer");

int tokens = stTemp.countTok ens();

if(tokens <= 1)
{
// No matches found for string to be replaces.
System.out.prin tln("No matches found for string to be replaced");
return;
}

fileData = new StringBuffer("" );

while(stTemp.ha sMoreTokens())
{
//fileData.append (stTemp.nextTok en());// + replacerString) ;
fileData.append (stTemp.nextTok en() + replacerString) ;
}

if(file.exists( ))
file.delete();

file = new File(filePath);
if(!file.exists ())
file.createNewF ile();

DataOutputStrea m dos = new DataOutputStrea m(new FileOutputStrea m(file));
dos.writeChars( fileData.toStri ng());
dos.flush();
dos.close();
}



}

when i run this ..

i am not getting expected out put..
please suggest me something

[dmjpro]

i want to search and replace strings present in a file (entire file)..
i have wirtten cod eto do this..
but it is not working as expected..

code is :


import java.io.*;
import java.util.*;

public class StringReplacer {

private String replaceString;
private String replacerString;
private String filePath;

public StringReplacer( String replaceString, String replacerString, String filePath)
{
this.replaceStr ing = replaceString;
this.replacerSt ring = replacerString;
this.filePath = filePath;
try
{
replace();
}
catch (Exception ex)
{
}
}

public StringReplacer( )
{

}
private void replace() throws Exception
{
//RandomAccessFil e raf=new RandomAccessFil e(filepath,"rwd ");
File file = new File(filePath);
if(!file.exists ())
{
System.out.prin tln("File doesnot exists");
return;
}

DataInputStream dis = new DataInputStream (new FileInputStream (file));

StringBuffer fileData = new StringBuffer("" );
String strTemp = "";

System.out.prin tln("before while");
while((strTemp = dis.readLine()) != null)
{
//String str=new String();
System.out.prin tln("inside while");
fileData.append (strTemp);
System.out.prin tln(strTemp);
}
System.out.prin tln("after while");


dis.close();

System.out.prin tln("before string tokenizer");
StringTokenizer stTemp = new StringTokenizer (fileData.toStr ing()," ",true);
System.out.prin tln(stTemp);
System.out.prin tln("after string tokenizer");

int tokens = stTemp.countTok ens();

if(tokens <= 1)
{
// No matches found for string to be replaces.
System.out.prin tln("No matches found for string to be replaced");
return;
}

fileData = new StringBuffer("" );

while(stTemp.ha sMoreTokens())
{
//fileData.append (stTemp.nextTok en());// + replacerString) ;
fileData.append (stTemp.nextTok en() + replacerString) ;
}

if(file.exists( ))
file.delete();

file = new File(filePath);
if(!file.exists ())
file.createNewF ile();

DataOutputStrea m dos = new DataOutputStrea m(new FileOutputStrea m(file));
dos.writeChars( fileData.toStri ng());
dos.flush();
dos.close();
}



}

when i run this ..

i am not getting expected out put..
please suggest me something

I think you use the Java 1.3.
From Java 1.4 the String.replace method available.
I think you try to write code yourself.
Good Idea!
First get the total string in a String variable.
Then try my code.....

String file_str = ......
if(file_str.indexOf(replaceString)!=-1){
StringBuffer temp_str = new StringBuffer(file_str);
boolean complete = false;
int start_pos;
while(!complete)
if((start_pos=temp_str.toString().indexOf(replaceString))!-=1) temp_str = temp_str.replace(start_pos,replace_str.length(),replacerString);
String replaced_str = temp_str.toString();
}
 

I think it will work.

Debasis Jana

[JosAH]

Don't use DataStreams for text reading/writing purposes; use Readers and Writers
instead. They're made for that job.

kind regards,

Jos