How can I rename all files in a folder using Java?
This is a discussion on How can I rename all files in a folder using Java? within the Java Programming forums, part of the Software Development category; Hi All, Am trying to rename all the files in a given directory,for ex if theres a file called ...
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#1
10-11-2007, 06:15 AM
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 How can I rename all files in a folder using Java? Hi All, Am trying to rename all the files in a given directory,for ex if theres a file called hello.xls,hello1.xls then after the execution of the program it must become hello_Bs.xls,hello1_Bs.xls I have written a simple code for this but am getting null pointer exception. can anybody pls temme wats worng with the code. Code: import java.io.*;
import java.lang.*;
import java.util.*;
public class Ls {
public static void main(String args[])
{
String[] dir = new java.io.File("c:\\Documents and Settings\\Admin\\Desktop\\New Folder").list();
java.util.Arrays.sort(dir);
File f[] = new File("c:\\Documents and Settings\\Admin\\Desktop\\New Folder)").listFiles();
int len1 = dir.length;
for (int i=0;i<len1; i++)
{
System.out.println(dir[i]);
String name = f[i].getName();
System.out.println(name);
int j=name.indexOf('.');
System.out.println(j);
String newname = name.substring(0,j-1) + "_BS" + name.substring(j+1,name.length());
System.out.println(newname);
File newFileName=new File(f[i].getParentFile(), newname);
System.out.println("newFileName="+newFileName);
f[i].renameTo(newFileName);
}
}
}     |
Re: How can I rename all files in a folder using Java? |
#3
11-12-2007, 11:09 PM
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 Re: How can I rename all files in a folder using Java? The problem is here... Code: String newname = name.substring(0,j-1) + "_BS" + name.substring(j+1,name.length()); Fixed code is... Code: import java.io.File;
public class Ls {
public static void main(String args[])
{
String[] dir = new java.io.File("test").list();
java.util.Arrays.sort(dir);
File f[] = new File("test").listFiles();
int len1 = dir.length;
for (int i=0;i<len1; i++)
{
System.out.println(dir[i]);
String name = f[i].getName();
System.out.println(name);
int j=name.indexOf('.');
System.out.println(j);
String newname = name.substring(0,j) + "_BS" + name.substring(j,name.length());
System.out.println(newname);
File newFileName=new File(f[i].getParentFile(), newname);
System.out.println("newFileName="+newFileName);
f[i].renameTo(newFileName);
}
}
}
__________________ S.VinothkumaR Behind me is infinite power, Before me is Endless Possibility, Around me is Boundless Opportunity, Why should I fear! |
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#5
11-12-2007, 11:15 PM
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| Re: How can I rename all files in a folder using Java? Hi, I tried this program but I am getting some problem in calling the "i" string. Could you please specify what "i" string is doing. Thanks a lot.
__________________ cheers Aman |
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