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.replaceString = replaceString;
this.replacerString = replacerString;
this.filePath = filePath;
try
{
replace();
}
catch (Exception ex)
{
}
}

public StringReplacer()
{

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

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

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

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


dis.close();

System.out.println("before string tokenizer");
StringTokenizer stTemp = new StringTokenizer(fileData.toString()," ",true);
System.out.println(stTemp);
System.out.println("after string tokenizer");

int tokens = stTemp.countTokens();

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

fileData = new StringBuffer("");

while(stTemp.hasMoreTokens())
{
//fileData.append(stTemp.nextToken());// + replacerString);
fileData.append(stTemp.nextToken() + replacerString);
}

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

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

DataOutputStream dos = new DataOutputStream(new FileOutputStream(file));
dos.writeChars(fileData.toString());
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.replaceString = replaceString;
this.replacerString = replacerString;
this.filePath = filePath;
try
{
replace();
}
catch (Exception ex)
{
}
}

public StringReplacer()
{

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

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

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

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


dis.close();

System.out.println("before string tokenizer");
StringTokenizer stTemp = new StringTokenizer(fileData.toString()," ",true);
System.out.println(stTemp);
System.out.println("after string tokenizer");

int tokens = stTemp.countTokens();

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

fileData = new StringBuffer("");

while(stTemp.hasMoreTokens())
{
//fileData.append(stTemp.nextToken());// + replacerString);
fileData.append(stTemp.nextToken() + replacerString);
}

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

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

DataOutputStream dos = new DataOutputStream(new FileOutputStream(file));
dos.writeChars(fileData.toString());
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