將我的字節數組讀入輸入流

Question

每當我想在動作偵聽器中運行fileToByteArray方法時，它都會詢問try catch語句。當我運行代碼時，我輸入的文件不會被分解爲字節。我已經嘗試了一切。有人可以幫忙嗎？

// ClientFrame.java 
// 
// Informatics 45 Spring 2010 
// Code Example: GUI with Simple Sockets 


import java.awt.*; 
import java.awt.event.*; 

import java.io.*; 
import java.net.Socket; 

import javax.swing.*; 


public class ClientFrame extends JFrame implements ClientProtocolListener 
{ 
    private JTextField nameField; 
    private JTextField addressField; 
    private JTextField portField; 
    private JButton connectButton; 
    private DefaultListModel resultsListModel; 
    static Socket sockets; 
    File files; 

    private ClientProtocol clientProtocol; 
    static File file; 


    public ClientFrame() 
    { 
     setSize(500, 700); 
     setTitle("Informatics 45 GUIs and Sockets Example (Client)"); 
     setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE); 

     buildUI(); 

     clientProtocol = null; 
    } 


    private void buildUI() 
    { 
     GridBagLayout layout = new GridBagLayout(); 
     getContentPane().setLayout(layout); 

     JLabel nameLabel = new JLabel("Your name: "); 
     layout.setConstraints(
      nameLabel, 
      new GridBagConstraints(
       0, 0, 1, 1, 0.0, 0.0, 
       GridBagConstraints.WEST, GridBagConstraints.NONE, 
       new Insets(10, 10, 10, 10), 0, 0)); 
     getContentPane().add(nameLabel); 

     nameField = new JTextField(); 
     layout.setConstraints(
      nameField, 
      new GridBagConstraints(
       1, 0, 1, 1, 1.0, 0.0, 
       GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, 
       new Insets(10, 10, 10, 10), 0, 0)); 
     getContentPane().add(nameField); 

     JLabel addressLabel = new JLabel("Address:"); 
     layout.setConstraints(
      addressLabel, 
      new GridBagConstraints(
       0, 1, 1, 1, 0.0, 0.0, 
       GridBagConstraints.WEST, GridBagConstraints.NONE, 
       new Insets(10, 10, 10, 10), 0, 0)); 
     getContentPane().add(addressLabel); 

     addressField = new JTextField(); 
     layout.setConstraints(
      addressField, 
      new GridBagConstraints(
       1, 1, 1, 1, 1.0, 0.0, 
       GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, 
       new Insets(10, 10, 10, 10), 0, 0)); 
     getContentPane().add(addressField); 

     JLabel portLabel = new JLabel("Port: "); 
     layout.setConstraints(
      portLabel, 
      new GridBagConstraints(
       0, 2, 1, 1, 0.0, 0.0, 
       GridBagConstraints.WEST, GridBagConstraints.NONE, 
       new Insets(10, 10, 10, 10), 0, 0)); 
     getContentPane().add(portLabel); 

     portField = new JTextField(); 
     layout.setConstraints(
      portField, 
      new GridBagConstraints(
       1, 2, 1, 1, 1.0, 0.0, 
       GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, 
       new Insets(10, 10, 10, 10), 0, 0)); 
     getContentPane().add(portField); 

     connectButton = new JButton("Connect"); 
     connectButton.addActionListener(
      new ActionListener() 
      { 
       public void actionPerformed(ActionEvent e) 
       { 
        connect(); 
        //getFileChooser(); 
        try { 
         fileToByteArray(file); 
        } catch (IOException e1) { 
         // TODO Auto-generated catch block 
         e1.printStackTrace(); 
        } 

       } 
      }); 
     layout.setConstraints(
      connectButton, 
      new GridBagConstraints(
       1, 3, 1, 1, 0.0, 0.0, 
       GridBagConstraints.EAST, GridBagConstraints.NONE, 
       new Insets(10, 10, 10, 10), 0, 0)); 
     getContentPane().add(connectButton); 

     JLabel statusLabel = new JLabel("Status"); 
     layout.setConstraints(
      statusLabel, 
      new GridBagConstraints(
       0, 4, 1, 1, 0.0, 0.0, 
       GridBagConstraints.WEST, GridBagConstraints.NONE, 
       new Insets(10, 10, 10, 10), 0, 0)); 
     getContentPane().add(statusLabel); 

     resultsListModel = new DefaultListModel(); 
     JList resultsList = new JList(resultsListModel); 
     JScrollPane resultsScroller = new JScrollPane(resultsList); 
     layout.setConstraints(
      resultsScroller, 
      new GridBagConstraints(
       0, 5, 2, 1, 1.0, 1.0, 
       GridBagConstraints.CENTER, GridBagConstraints.BOTH, 
       new Insets(10, 10, 10, 10), 0, 0)); 
     getContentPane().add(resultsScroller); 
    } 


    private void connect() 
    { 
     String name = getNameFromField(); 
     String address = getAddressFromField(); 
     int port = getPortFromField(); 

     if (name == null || address == null || port == -1) 
     { 
      return; 
     } 

     connectButton.setEnabled(false); 
     resultsListModel.addElement("Connecting to " + address + " port " + port); 

     clientProtocol = new ClientProtocol(name, address, port); 
     clientProtocol.addClientProtocolListener(this); 

     Thread clientThread = new Thread(clientProtocol); 
     clientThread.start(); 
    } 


    private String getNameFromField() 
    { 
     String name = nameField.getText().trim(); 

     if (name.length() == 0) 
     { 
      JOptionPane.showMessageDialog(
       this, "Please specify a name", "Validation Error", 
       JOptionPane.ERROR_MESSAGE); 

      return ""; 
     } 

     return name; 
    } 


    private String getAddressFromField() 
    { 
     String address = addressField.getText().trim(); 

     if (address.length() == 0) 
     { 
      JOptionPane.showMessageDialog(
       this, "Please specify an address", "Validation Error", 
       JOptionPane.ERROR_MESSAGE); 

      return null; 
     } 

     return address; 
    } 


    private int getPortFromField() 
    { 
     int port; 

     try 
     { 
      port = Integer.parseInt(portField.getText()); 
     } 
     catch (NumberFormatException e) 
     { 
      JOptionPane.showMessageDialog(
       this, "Please specify a number for the port between 0 and 65535", 
       "Validation Error", JOptionPane.ERROR_MESSAGE); 

      return -1; 
     } 

     return port; 
    } 


    public void connectionEstablished(final String serverAddress, final int serverPort) 
    { 
     EventQueue.invokeLater(
      new Runnable() 
      { 
       public void run() 
       { 
        resultsListModel.addElement("Connected to " + serverAddress + " port " + serverPort); 
       } 
      }); 
    } 


    public void okayReceived(final String otherName) 
    { 
     EventQueue.invokeLater(
      new Runnable() 
      { 
       public void run() 
       { 
        resultsListModel.addElement("OKAY received from " + otherName); 
       } 
      }); 
    } 


    public void connectionClosed() 
    { 
     EventQueue.invokeLater(
      new Runnable() 
      { 
       public void run() 
       { 
        resultsListModel.addElement("Connection closed"); 
        connectButton.setEnabled(true); 
       } 
      }); 
    } 


    public void protocolFailed(final Exception failureReason) 
    { 
     EventQueue.invokeLater(
      new Runnable() 
      { 
       public void run() 
       { 
        resultsListModel.addElement(
         "Protocol failure: " + failureReason.getMessage()); 

        connectButton.setEnabled(true); 
       } 
      }); 
    } 


    public void dispose() 
    { 
     if (clientProtocol != null) 
     { 
      clientProtocol.removeClientProtocolListener(this); 
      clientProtocol.close(); 
     } 

     super.dispose(); 
    } 

    public void getFileChooser(){ 
     FileChooser chooseFile = new FileChooser(); 
     file = chooseFile.getFile(); 
    } 

    public byte[] fileToByteArray(File fileArray) 
    throws IOException 
     { 
      if (fileArray.exists() == false) 
      { 
       System.out.println ("Please specify a file to read "); 
       return null; 
      } 
      int fileLength = (int) fileArray.length(); 

      byte[] fileBytes = new byte[fileLength]; 

      FileInputStream input = new FileInputStream (fileArray); 

      int offset = 0; 

      while (offset < fileLength) 
      { 
       int nextChunkSize = Math.min(65536, fileLength - offset); 
       offset += input.read(fileBytes, offset, nextChunkSize); 
      } 

      input.close(); 

      System.out.println ("The files lenth was " + fileLength); 

      System.out.println ("The first 10 bytes are :") 
; 

     for (int i = 0; i <10; i++) 
    { 
     System.out.print (Integer.toHexString (((int)fileBytes[i])&0xFF).toUpperCase()); 
     System.out.print(" " ); 
    } 



      return fileBytes; 
     } 

    public void sendFile(byte[] byteArray){ 


    } 



} 

Answer 1

如果您不介意包含JAR，Apache Commons IO有readFileToByteArray()。