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Title copying a file
Author Shameek Ray
Author Email shameek.ray [at] rediffmail.com
Description this code lets one to copy one file into another with options like appending to a file or overwriting a file or creating a new file

Category Java » Beginners / Lab Assignments
Hits 14987
Code Select and Copy the Code
/* Copy.java copies one file to another. if the destination file exists the user is given the options to overwrite or append to the the existing file or enter a new file name or exit. */ import java.io.*; class Copy{ private static FileInputStream fin; private static FileOutputStream fout; private static boolean flag; // creates a new file outputstream instance static FileOutputStream create(String s) throws IOException{ flag=true; fout=new FileOutputStream(s); flag=false; return fout; } // creates a file outputstream instance in append mode static FileOutputStream append(String s) throws IOException{ return fout=new FileOutputStream(s,true); } // displays message if program cannot copy a file static void nocopy(){ System.out.println("No File Copied"); System.out.println("Thank you for using this program...."); } public static void main(String args[]) throws IOException{ fin=null; fout=null; File f=null; int i=0; char ch; boolean fl=false; try{ fin=new FileInputStream(args[0]); f=new File(args[1]); if(f.isDirectory()){ args[1]+=args[0]; f=new File(args[1]); } if(f.exists()){ //outer if if(args[0].equals(args[1])){ throw new MyException("File cannot be copied onto itself!!"); } System.out.println("'"+args[1]+"' already exists!!"); System.out.println(); if(!f.canWrite()){ System.out.println("'"+args[1]+"' is read-only. Access denied!!"); System.out.println(); } else{ System.out.println("Overwrite----------------> o"); System.out.println("Append to existing file--> a"); fl=true; } System.out.println("New destination file-----> n"); System.out.println("Exit---------------------> any other key"); ch=ReadVal.readChar(); switch(ch){ //switch begins case 'o': case 'O': if(fl) create(args[1]); else throw new MyException(""); break; case 'a': case 'A': if(fl) append(args[1]); else throw new MyException(""); break; case 'n': case 'N': String s; System.out.print("enter new file name : "); s=ReadVal.readString(); File f1=new File(s); if(f1.exists()){ if(args[0].equals(s)){ throw new MyException("File cannot be copied onto itself!!"); } if(!f1.canWrite()) throw new MyException("'"+s+"' is read-only. Access denied!!"); System.out.println("File exists!!"); System.out.print("Overwrite / Append / Exit ? "); char c; c=ReadVal.readChar(); if(c=='o' || c=='O') create(s); else if(c=='a' || c=='A') append(s); else{ nocopy(); System.exit(1); } } if(fout==null) create(s); break; default: nocopy(); return; } //switch ends } //outer if ends if(fout==null) create(args[1]); } //try ends catch(ArrayIndexOutOfBoundsException ae){ System.out.println("Usage : java Copy <source file> <destination file>"); System.out.println("Required parameter(s) missing."); return; } catch(FileNotFoundException fe){ if(flag) System.out.println("Cannot copy to disk. Access denied!!"); else System.out.println("Source file does not exist"); nocopy(); return; } catch(MyException me){ System.out.println(me); nocopy(); return; } // read from source file & write to destination file try{ while((ifin.read())!=-1){ fout.write((char)i); // i=fin.read(); } fin.close(); fout.close(); } catch(IOException ie){} System.out.println("File Copied Successfully"); System.out.println("Thank you for using this program...."); } } ********************************************************************** //ReadVal.java import java.io.*; public class ReadVal { static int readInt(){ int i=0; try{ BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); i=Integer.parseInt(br.readLine()); } catch(IOException ie){ System.out.println(ie); i=0; } catch(NumberFormatException ne){ System.out.println("idiot u were asked to enter a number!!!!"); i=0; } return i; } static String readString(){ String s=""; try{ BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); s=br.readLine(); } catch(IOException ie){ System.out.println(ie); s=""; } return s; } static double readDouble(){ double d=0; try{ BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); d=Double.parseDouble(br.readLine()); } catch(IOException ie){ System.out.println(ie); d=0; } catch(NumberFormatException ne){ System.out.println("idiot u were asked to enter a number!!!!"); d=0; } return d; } static float readFloat(){ float f=0; try{ BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); f=Float.parseFloat(br.readLine()); } catch(IOException ie){ System.out.println(ie); f=0; } catch(NumberFormatException ne){ System.out.println("idiot u were asked to enter a number!!!!"); f=0; } return f; } static char readChar(){ char c; try{ c=readString().charAt(0); } catch(StringIndexOutOfBoundsException se){ c=0; } return c; } }

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