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This page contains an archived post to the Java Answers Forum made prior to February 25, 2002.
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Message:
RE: File Copy
Posted by Kishori Sharan on September 06, 2000 at 11:49 AM
Hi
Here is the code in FileCopy.java to copy a file. You can do the second problem reading thru the code of FileCopy.java because it also uses reading from and writing to a file. Thanx
Kishori /////////////FileCopy.java
import java.io.* ;
public class FileCopy {
private static void quit ( String str) {
System.out.println ( str ) ;
System.exit ( 1 ) ;
}
public static void main ( String[] args ) {
// Varibles to hold source and destination files
String sourceFileName ;
String targetFileName ;
// Temporary string object to get input from user
String temp = "" ;
// Prompt user to specify the source and destination files
System.out.println ( "Please specify source and destination files name separated by space(s) ");
// Prepare the input stream to read the file names
BufferedReader in = new BufferedReader ( new InputStreamReader ( System.in ) ) ;
try {
temp = in.readLine ( ).trim ( ) ;
} catch ( IOException e ) { }
// Make sure user entered the file names
if ( temp == null || temp.length() == 0 ) {
quit ( "Invalid files name" ) ;
}
/* Get the source and target file names */
// Find the position of space(s)
int space = temp.indexOf ( " " ) ;
if ( space == -1 ) {
quit ( "Invalid file names" ) ;
}
sourceFileName = temp.substring ( 0, space ) ;
targetFileName = temp.substring ( space + 1 ).trim ( ) ;
// Check if source file exists
File source = new File ( sourceFileName ) ;
if ( !source.exists() ) {
quit ( sourceFileName + " doesn't exist." ) ;
}
// Check if source is a file
if ( !source.isFile ( ) ) {
quit ( sourceFileName + " is not a file." ) ;
}
// Check if target file exists
File target = new File ( targetFileName ) ;
if ( target.exists() ) {
// Prompt user for overwriting the target file
System.out.print ( "\nOverwrite " + targetFileName + " (Y/N)?" ) ;
try {
temp = in.readLine ( ) ;
if ( temp == null ) {
quit ( "Unknown problem" ) ;
}
if ( !temp.toUpperCase().equals( "Y" ) ) {
quit ( "" ) ;
}
} catch ( IOException e ) {
quit ( "UnKnown problem" ) ;
}
}
// Prepare the input and output streams for final file copy
BufferedWriter out = null ;
try {
out = new BufferedWriter ( new FileWriter ( target ) ) ;
in = new BufferedReader ( new FileReader ( source ) ) ;
} catch ( IOException e ) {
quit ( "Unknown Problem") ;
}
try {
int ch ;
ch = in.read ( ) ;
while ( ch != -1 ) {
out.write ( ch ) ;
ch = in.read ( ) ;
}
} catch ( IOException e ) { }
finally {
try {
in.close ( ) ;
out.close ( );
} catch ( IOException e ) { }
}
}
}
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