//**************************************
//
// Name: File Handler
// Description:The class contains Static
// methods that allow the class user to wor
// k with a file. save, read, save as and o
// pen file dialog and some other methods.
// Please note that both classes are includ
// ed here. FileHandler and FileFilterExten
// sion. PLEASE RATE IT.
// By: Adisson Ruiz
//
// Returns:Linkedlists, vectors and stri
// ng depending on the method invoked.
//
// Assumes:<<<<<<<&
// lt;<<<<Examples>>>&
// gt;>>>>>>>>>&
// gt;
String filePath = FileHandler.OpenFileDialog(this,"Open File","txt","Text files (*.txt)");
LinkedList fileContent = FileHandler.ReadFile(filePath);
ApplicationFileHeader is used to prevent users from opening files that don't belong to your application. A header is placed before the file content.
FileHandler.SaveFile(ApplicationFileHeader,fileContent ,filePath)
FileHandler.FileExists(filePath)
//
//This code is copyrighted and has// limited warranties.Please see http://
// www.Planet-Source-Code.com/vb/scripts/Sh
// owCode.asp?txtCodeId=1883&lngWId;=2//for details.//**************************************
//
/* Copyright: this should not be copied or edited unless with the authors permission
* Company: <P>
* @author: Adisson Ruiz
* Date:15/03/2000
* @version 1.0
*/
/**covers most File handling needs**/
package utilities.File;
import utilities.File.FileFilterExtension;
import javax.swing.*;
import java.awt.Component;
import java.io.*;
import java.util.Vector;
import java.util.LinkedList;
public class FileHandler
{
/*****************************************************************
* Save as FILE DIALOG BOX *
******************************************************************/
public static String saveAsFileDialog(Component Owner,String fileFilterExtension,String fileDescription)
{
return saveAsFileDialog(Owner,null,null,' ',fileFilterExtension,fileDescription);
}
public static String saveAsFileDialog(Component Owner,String Title,String AproveButton,char Mneumonic,String fileFilterExtension,String fileDescription)
{
JFileChooser chooser = new JFileChooser();
FileFilterExtension filter = new FileFilterExtension();
if (fileFilterExtension != null)
{
filter.addExtension(fileFilterExtension);
chooser.addChoosableFileFilter(filter);
chooser.setFileFilter(filter);
}
if (fileDescription != null)
filter.setDescription(fileDescription);
if (Title != null)
chooser.setDialogTitle(Title);
if (AproveButton != null)
chooser.setApproveButtonText(AproveButton);
if (Mneumonic != ' ')
chooser.setApproveButtonMnemonic(Mneumonic);
if (JFileChooser.APPROVE_OPTION == chooser.showSaveDialog(Owner))
return chooser.getSelectedFile().getPath();
return null;
}
/*****************************************************************
* OPEN FILE DIALOG BOX*
******************************************************************/
public static String OpenFileDialog(Component Owner,String Title)
{
return OpenFileDialog(Owner,Title,null,' ',null,null);
}
public static String OpenFileDialog(Component Owner,String Title,String Extension,String fileDescription)
{
return OpenFileDialog(Owner,Title,null,' ',Extension,fileDescription);
}
public static String OpenFileDialog(Component Owner,String Title,String AproveButton,char Mneumonic,String fileFilterExtension,String fileDescription)
{
JFileChooser chooser = new JFileChooser();
FileFilterExtension filter = new FileFilterExtension();
if (fileFilterExtension != null)
{
filter.addExtension(fileFilterExtension);
chooser.addChoosableFileFilter(filter);
chooser.setFileFilter(filter);
}
if (fileDescription != null)
filter.setDescription(fileDescription);
if (Title != null)
chooser.setDialogTitle(Title);
if (AproveButton != null)
chooser.setApproveButtonText(AproveButton);
if (Mneumonic != ' ')
chooser.setApproveButtonMnemonic(Mneumonic);
if (JFileChooser.APPROVE_OPTION == chooser.showOpenDialog(Owner))
return chooser.getSelectedFile().getPath();
return null;
}
/*****************************************************************
* Saves files*
******************************************************************/
public static boolean SaveFile(String FileHeader,Vector FileLines,String tOutputFile)
{
File OutputFile = new File(tOutputFile);
FileWriter CharWriter;
try
{
CharWriter = new FileWriter(OutputFile);
}
catch(IOException e)
{
return false;
}
if (FileLines.size()>0)
{
PrintWriter LineWriter = new PrintWriter(CharWriter);
LineWriter.println(FileHeader);
for (int x=0;x<FileLines.size();x++)
LineWriter.println(FileLines.get(x).toString());
LineWriter.close();
return true;
}
return false;
}
public static boolean SaveFile(String FileHeader,LinkedList FileLines,String tOutputFile)
{
File OutputFile = new File(tOutputFile);
FileWriter CharWriter;
try
{
CharWriter = new FileWriter(OutputFile);
}
catch(IOException e)
{
return false;
}
if (FileLines.size()>0)
{
PrintWriter LineWriter = new PrintWriter(CharWriter);
LineWriter.println(FileHeader);
for (int x=0;x<FileLines.size();x++)
LineWriter.println(FileLines.get(x).toString());
LineWriter.close();
return true;
}
return false;
}
public static boolean SaveFile(LinkedList FileLines,String tOutputFile)
{
File OutputFile = new File(tOutputFile);
FileWriter CharWriter;
try
{
CharWriter = new FileWriter(OutputFile);
}
catch(IOException e)
{
return false;
}
if (FileLines.size()>0)
{
PrintWriter LineWriter = new PrintWriter(CharWriter);
for (int x=0;x<FileLines.size();x++)
LineWriter.println(FileLines.get(x).toString());
LineWriter.close();
return true;
}
return false;
}
public static boolean SaveFile(String FileLines,String tOutputFile)
{
File OutputFile = new File(tOutputFile);
FileWriter CharWriter;
try
{
CharWriter = new FileWriter(OutputFile);
}
catch(IOException e)
{
return false;
}
if (FileLines.length()>0)
{
PrintWriter LineWriter = new PrintWriter(CharWriter);
LineWriter.println(FileLines);
LineWriter.close();
return true;
}
return false;
}
/*****************************************************************
* Reads files*
******************************************************************/
public static LinkedList ReadFile(String tInputFile)
{
File InputFile = new File(tInputFile);
FileReader CharReader;
LinkedList FileContent = new LinkedList();
String CurrentLine;
try
{
CharReader = new FileReader(InputFile);
}
catch(IOException e)
{
return null;
}
BufferedReader Buffer = new BufferedReader(CharReader);
do
{
try
{
CurrentLine = Buffer.readLine();
if (CurrentLine != null)
FileContent.add(CurrentLine);
else
{
FileContent.add(null);
Buffer.close();
}
}
catch(IOException e)
{
return FileContent;
}
}while(CurrentLine != null);
return FileContent;
}
public static Vector vReadFile(String tInputFile)
{
File InputFile = new File(tInputFile);
FileReader CharReader;
Vector FileContent = new Vector(0);
String CurrentLine;
try
{
CharReader = new FileReader(InputFile);
}
catch(IOException e)
{
FileContent.add(null);
return FileContent;
}
BufferedReader Buffer = new BufferedReader(CharReader);
do
{
try
{
CurrentLine = Buffer.readLine();
if (CurrentLine != null)
FileContent.add(CurrentLine);
else
{
FileContent.add(null);
Buffer.close();
}
}
catch(IOException e)
{
return FileContent;
}
}while(CurrentLine != null);
return FileContent;
}
/*****************************************************************
*checks file for a header*
******************************************************************/
public static boolean CheckFileHeader(String tInputFile,String tFileHeader)
{
File InputFile = new File(tInputFile);
FileReader CharReader;
String FileHeader;
try
{
CharReader = new FileReader(InputFile);
}
catch(IOException e)
{
return false;
}
BufferedReader Buffer = new BufferedReader(CharReader);
try
{
FileHeader = Buffer.readLine();
Buffer.close();
}
catch(IOException e)
{
return false;
}
if (FileHeader != null)
return (FileHeader.equals(tFileHeader));
else
return false;
}
/*****************************************************************
* File exists*
******************************************************************/
public static boolean FileExists(String FileName)
{
File tFile = new File(FileName);
return tFile.exists();
}
}
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
package utilities.File;
import javax.swing.filechooser.FileFilter;
import java.io.File;
import java.util.Hashtable;
public class FileFilterExtension extends FileFilter
{
private String Description = "";
private Hashtable filters = null;
FileFilterExtension()
{
filters = new Hashtable();
setDescription("Unknown File Type");
}
public void addExtension(String Extension)
{
filters.put(Extension.toLowerCase(),this);
}
public void setDescription(String Description)
{
this.Description = Description;
}
public String getDescription()
{
return Description;
}
public boolean accept(File file)
{
if (file != null)
if (file.isDirectory())
return true;
String Extension = getExtension(file);
if (Extension != null && filters.get(Extension) != null)
return true;
return false;
}
protected String getExtension(File file)
{
if (file != null)
{
String FileName = file.getName();
int i = FileName.lastIndexOf('.');
if (1>0 && i < FileName.length() -1)
return FileName.substring(i+1).toLowerCase();
}
return null;
}
}
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