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How to Segment a File in Java?

File Segmentation in Java

Condition for Segmenting a File in Java

  • Description: Segmenting a file in Java involves reading the file in smaller parts or chunks, typically by using `FileInputStream` to read the data and `FileOutputStream` to write the segments. The file is divided into fixed-size blocks, with each block being written to a separate file. This can be achieved by reading a specific number of bytes from the original file at a time and writing them to new files until the entire file is processed. To ensure the process is efficient, buffered streams like `BufferedInputStream` and `BufferedOutputStream` can be used to minimize the number of read and write operations. Additionally, keeping track of the segment index allows the creation of uniquely named output files for each segment. Error handling is crucial to manage situations such as file not found or I/O exceptions during the segmentation process.
Sample Source Code
  • # FileSegment.java
    package JavaSamples;

    import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    import javax.swing.JOptionPane;

    public class FileSegment extends javax.swing.JFrame {
    public FileSegment() {
    initComponents();
    }

    @SuppressWarnings("unchecked")
    // //GEN-BEGIN:initComponents
    private void initComponents() {

    jLabel1 = new javax.swing.JLabel();
    jLabel2 = new javax.swing.JLabel();
    jTextField1 = new javax.swing.JTextField();
    jLabel3 = new javax.swing.JLabel();
    jButton1 = new javax.swing.JButton();
    jTextField2 = new javax.swing.JTextField();
    jButton2 = new javax.swing.JButton();
    jButton3 = new javax.swing.JButton();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    jLabel1.setText("FileSegmenter");

    jLabel2.setText("File Path");

    jLabel3.setText("Directory");

    jButton1.setText("Choose File");
    jButton1.addActionListener(new java.awt.event.ActionListener() {
    public void actionPerformed(java.awt.event.ActionEvent evt) {
    jButton1ActionPerformed(evt);
    }
    });

    jButton2.setText("Choose");
    jButton2.addActionListener(new java.awt.event.ActionListener() {
    public void actionPerformed(java.awt.event.ActionEvent evt) {
    jButton2ActionPerformed(evt);
    }
    });

    jButton3.setText("Segment");
    jButton3.addActionListener(new java.awt.event.ActionListener() {
    public void actionPerformed(java.awt.event.ActionEvent evt) {
    jButton3ActionPerformed(evt);
    }
    });

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
    layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
    .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
    .addComponent(jButton1)
    .addGap(141, 141, 141))
    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
    .addComponent(jButton3)
    .addComponent(jButton2))
    .addGap(160, 160, 160))))


    layout.setVerticalGroup(
    layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
    .addGroup(layout.createSequentialGroup()
    .addContainerGap()
    .addComponent(jLabel1)
    .addGap(17, 17, 17)
    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
    .addComponent(jLabel2)
    .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
    .addGap(18, 18, 18)
    .addComponent(jButton1)
    .addGap(19, 19, 19)
    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
    .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
    .addComponent(jLabel3))
    .addGap(18, 18, 18)
    .addComponent(jButton2)
    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 29, Short.MAX_VALUE)
    .addComponent(jButton3)
    .addGap(27, 27, 27))

    pack();
    }//
    //GEN-END:initComponents
Screenshots
  • STEP 1: The user selects a file (text document) from local files.
  • Choose File

  • STEP 2: User clicks the "Choose File" button to navigate the local device and select a file.
  • User clicks the 'Choose File' button to navigate the local device and select a file

  • STEP 3: The file path will be displayed in the text field.
  • The file path will be displayed in the text field.

  • STEP 4: The user selects a directory to store the segmented files.
  • The user selects a directory to store the segmented files.

  • STEP 5: Segmented files (Part 1, Part 2, Part 3) are generated in the specified directory.

  • Segmented files (Part 1, Part 2, Part 3) are generated in the specified directory.

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