[Java] read and write a file

**mickey** · 22nd June 2008, 03:03

Hi,
I have one problem; I must read a html like this;

Qt Code:

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<html>
<body>
 Hello
</body>
</html>

<html>
<body>
 Hello
</body>
</html>

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I read this in a string (correct?) and after I have to do some changes to it and write it on disk but in this way:

Qt Code:

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<html>\n<body> ........

<html>\n<body> ........

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There, there's the '\n' because in the original file <body> was in another line of <html>
How can I do this? This my code for read and write:

Qt Code:

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File fin = new File(FILE_NAME); 	
			FileReader in = new FileReader(fin);			
			istream =  new BufferedReader( in );			    								
			String line = null;
 
			while ( (line = istream.readLine()) != null  ) {
				//System.out.println(line);
				sb.append(line);
			}
                        // here do changes on the sb
                        String text = sb.toString();
			FileWriter fw = new FileWriter(new File ("out.txt") );	
			out = new PrintWriter(fw);  
			out.println(text);

File fin = new File(FILE_NAME); 	
			FileReader in = new FileReader(fin);			
			istream =  new BufferedReader( in );			    								
			String line = null;
			
			while ( (line = istream.readLine()) != null  ) {
				//System.out.println(line);
				sb.append(line);
			}
                        // here do changes on the sb
                        String text = sb.toString();
			FileWriter fw = new FileWriter(new File ("out.txt") );	
			out = new PrintWriter(fw);  
			out.println(text);

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Thanks,

**patrik08** · 22nd June 2008, 09:20

The best way is Tidy the html or xml code

http://fop-miniscribus.googlecode.co...dy/bestqtidy.h
class QTidy
qt4 compatible lib...
http://fop-miniscribus.googlecode.co.../modules/tidy/

after you can parse as xml and read/write all your own chunk html...

or if you search only image on html code to load.....

Qt Code:

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/* read remote image from html code */
 void Load_Image_Connector()
{
    ///////////////////qDebug() << "### Load_Image_Connector";
 
    QRegExp expression( "src=[\"\'](.*)[\"\']", Qt::CaseInsensitive );
    expression.setMinimal(true);
    int iPosition = 0;
    int canna = 0;
    while( (iPosition = expression.indexIn( html , iPosition )) != -1 ) {
        QString semi1 = expression.cap( 1 );
        canna++;
        dimage.append(semi1);    /* image lista 1 */
        AppendImage(semi1);     /* register qmap  images & name & replace qurl remove css file */  
        iPosition += expression.matchedLength();
        ////////////////////qDebug() << "### iPosition " << iPosition;
    }
    QTimer::singleShot(1, this, SLOT(GetRemoteFile()));
 
}

/* read remote image from html code */
 void Load_Image_Connector()
{
    ///////////////////qDebug() << "### Load_Image_Connector";
    
    QRegExp expression( "src=[\"\'](.*)[\"\']", Qt::CaseInsensitive );
    expression.setMinimal(true);
    int iPosition = 0;
    int canna = 0;
    while( (iPosition = expression.indexIn( html , iPosition )) != -1 ) {
        QString semi1 = expression.cap( 1 );
        canna++;
        dimage.append(semi1);    /* image lista 1 */
        AppendImage(semi1);     /* register qmap  images & name & replace qurl remove css file */  
        iPosition += expression.matchedLength();
        ////////////////////qDebug() << "### iPosition " << iPosition;
    }
    QTimer::singleShot(1, this, SLOT(GetRemoteFile()));
    
}

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**patrik08** · 22nd June 2008, 09:27

IMO: here a symply BufferedReader to read & write file or buffer ... on QThread

I use it to send Image frame movie over QEvent at just time

http://fop-miniscribus.googlecode.co...t/image_event/

Qt Code:

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/* device to write or read from QThread or not */
 
class StreamFile
{
  public:
  StreamFile() 
  :d(new QBuffer())
  {
  d->open(QIODevice::ReadWrite);
  start();
  }
  ~StreamFile()
  {
   d->close();
  }
  bool clear()
  {
    d->write(QByteArray()); 
    return d->bytesAvailable() == 0 ? true : false;
  }
  void start() { 
    d->seek(0);
  }
  bool LoadFile( const QString file ) { 
    if (clear()) {
     QFile f(file); 
        if (f.exists()) {
          if (f.open(QFile::ReadOnly)) {
           d->write(f.readAll());
           f.close();
           start();
           return true;
          }
        }
    }
    return false;
  }
  bool PutOnFile( const QString file ) { 
      QFile f(file);
      if (f.open(QFile::WriteOnly)) {
        uint bi = f.write(d->readAll());
        start();
        return bi > 0 ? true : false;
      }
   return false; 
  }
  QBuffer *device() { return d; }
  bool isValid() { return img.loadFromData(stream()); }
  QByteArray stream() { return d->data(); }
  QImage img;
  QBuffer *d;
};

/* device to write or read from QThread or not */

class StreamFile
{
  public:
  StreamFile() 
  :d(new QBuffer())
  {
  d->open(QIODevice::ReadWrite);
  start();
  }
  ~StreamFile()
  {
   d->close();
  }
  bool clear()
  {
    d->write(QByteArray()); 
    return d->bytesAvailable() == 0 ? true : false;
  }
  void start() { 
    d->seek(0);
  }
  bool LoadFile( const QString file ) { 
    if (clear()) {
     QFile f(file); 
        if (f.exists()) {
          if (f.open(QFile::ReadOnly)) {
           d->write(f.readAll());
           f.close();
           start();
           return true;
          }
        }
    }
    return false;
  }
  bool PutOnFile( const QString file ) { 
      QFile f(file);
      if (f.open(QFile::WriteOnly)) {
        uint bi = f.write(d->readAll());
        start();
        return bi > 0 ? true : false;
      }
   return false; 
  }
  QBuffer *device() { return d; }
  bool isValid() { return img.loadFromData(stream()); }
  QByteArray stream() { return d->data(); }
  QImage img;
  QBuffer *d;
};

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