In this Java IO Tutorial, we will learn about FileReader and FileWriter. With these java.io classes we will read and write a text file.
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private void btnReadActionPerformed(java.awt.event.ActionEvent evt) { FileReader fRead = null; try { //Sample 009.1: Create File Reader String fileRead = txtFileRead.getText(); File file = new File(fileRead); fRead = new FileReader(file); //Sample 009.2: Read File Content char[] fileContent = new char[(int) file.length()]; fRead.read(fileContent); //Sample 009.3: Assing to Text Area String content = new String(fileContent); taTextContent.setText(content); fRead.close(); } catch (FileNotFoundException ex) { Logger.getLogger( FileReaderWriterExample.class.getName()).log( Level.SEVERE, null, ex); } catch (IOException ex) { Logger.getLogger(FileReaderWriterExample.class.getName()).log( Level.SEVERE, null, ex); } finally { try { fRead.close(); } catch (IOException ex) { Logger.getLogger(FileReaderWriterExample.class.getName()).log( Level.SEVERE, null, ex); } } } private void btnWriteActionPerformed(java.awt.event.ActionEvent evt) { //Sample 009.4: Declaration(s) FileWriter fWrite = null; try { //Sample 009.5: Get Content to Write Ready String strContent = taTextContent.getText(); //Sample 009.6: Get File for Writing in Append Mode String fileWrite = txtFileRead.getText(); fWrite = new FileWriter(fileWrite, false); //Sample 009.7: Write Content to File (Towards its end - append) fWrite.write(strContent); taTextContent.setText(""); } catch (IOException ex) { Logger.getLogger(FileReaderWriterExample.class.getName()).log( Level.SEVERE, null, ex); } finally { try { fWrite.close(); } catch (IOException ex) { Logger.getLogger(FileReaderWriterExample.class.getName()).log( Level.SEVERE, null, ex); } } } |
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