3

Please help me I want to make a GUI application which upload a file from client to server. when I click on browse button then file is copy in bytes form because we travel data in bytes on network but when I click on upload button then file cannot upload.

import javax.swing.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;

class ClientUpload extends JFrame implements ActionListener {

    JFileChooser fc;
    JButton b, b1;
    JTextField tf;
    FileInputStream in;
    Socket s;
    DataOutputStream dout;
    DataInputStream din;
    int i;

    ClientUpload() {
        super("client");
        tf = new JTextField();
        tf.setBounds(20, 50, 190, 30);
        add(tf);

        b = new JButton("Browse");
        b.setBounds(250, 50, 80, 30);
        add(b);
        b.addActionListener(this);
        b1 = new JButton("Upload");
        b1.setBounds(250, 100, 80, 30);
        add(b1);
        b1.addActionListener(this);
        fc = new JFileChooser();
        setLayout(null);
        setSize(400, 300);
        setVisible(true);
        try {
            s = new Socket("localhost", 10);
            dout = new DataOutputStream(s.getOutputStream());
            din = new DataInputStream(s.getInputStream());
            send();
        } catch (Exception e) {
        }
    }

    public void actionPerformed(ActionEvent e) {
        try {
            if (e.getSource() == b) {
                int x = fc.showOpenDialog(null);
                if (x == JFileChooser.APPROVE_OPTION) {
                    copy();
                }
            }
            if (e.getSource() == b1) {
                send();
            }
        } catch (Exception ex) {
        }
    }

    public void copy() throws IOException {
        File f1 = fc.getSelectedFile();
        tf.setText(f1.getAbsolutePath());
        in = new FileInputStream(f1.getAbsolutePath());
        while ((i = in.read()) != -1) {
            System.out.print(i);
        }
    }

    public void send() throws IOException {
        dout.write(i);
        dout.flush();

    }

    public static void main(String... d) {
        new ClientUpload();
    }
}
4

2 回答 2

3

当您选择文件时，您基本上是在读取文件的内容，丢弃内容，然后尝试将从文件int中读取的最后一个值发送到服务器。一个文件可能有很多很多很多字节长（想想千兆字节），一个intins 不会保存那么多信息（很差int）。

相反，当用户选择 a 时File，您应该保持对它的引用，直到您真正需要它...

public void actionPerformed(ActionEvent e) {
    try {
        if (e.getSource() == b) {
            int x = fc.showOpenDialog(null);
            if (x == JFileChooser.APPROVE_OPTION) {
                fileToBeSent = fc.getSelectedFile();
                tf.setText(f1.getAbsolutePath());
                b1.setEnabled(true);
            } else {
                fileToBeSent = null;
                tf.setText(null;);
                b1.setEnabled(false);
            }
        }
        if (e.getSource() == b1) {
            send();
        }
    } catch (Exception ex) {
    }
}

当用户按下“发送”按钮时，您只需将文件输入流复制到套接字输出流......

FileInputStream in = null;
try {
    in = new FileInputStream(fileToBeSent);
    byte[] buffer = new byte[1024];
    int bytesIn = -1;
    while ((bytesIn = in.read(buffer)) != -1) {
        dout.write(buffer, 0, bytesIn);
    }
    dout.flush();
} finally {
    try {
        in.close();
    } catch (Exception exp) {
    }
}

这至少应该让你更近一步。

您可能遇到的下一个问题是 UI 将在传输过程中停止响应。

在这种情况下，您应该看一下Swing 中的并发。

现代 UI 需要处理客户端机器的许多不同特性，包括不同的字体、字体渲染能力、DPI、屏幕分辨率等等。通过使用绝对布局，您将自己置于一个非常黑暗和深渊中。

您应该利用布局管理器 API，该 API 旨在减轻这些问题的压力，并使您的 UI 更适应不同的操作环境。

查看Container 内的 Layout out Components了解更多详情

您可能还想仔细查看Basic I/O和All about sockets以了解更多详细信息...

于 2013-10-03T06:50:28.667 回答
1

您只需复制并粘贴此代码，这将对您有所帮助....

这是服务器类

package newpack;

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;

public class SwingControlServer extends JFrame {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    private JPanel contentPane;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    SwingControlServer frame = new SwingControlServer();
                    frame.setVisible(false);
                    frame.start();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    protected static void start() throws IOException {
        // TODO Auto-generated method stub
         System.out.println("Server running...");
         
            /* Listen on port 5555 */
     
            ServerSocket server = new ServerSocket(10001);
     
            /* Accept the sk */
     
            Socket socket = server.accept();
           
            System.out.println("Server accepted client");
            InputStream inputStream=socket.getInputStream();
            byte[] readbyte=new byte[(1024*10)*1024];           
            
                
            FileOutputStream fileOutputStream=new FileOutputStream("D:/Manoj/hello21.zip");
            int writebyte;
            int count=0;
            while((writebyte=inputStream.read(readbyte))!=-1)
            {
                if(writebyte>0)
                    count+=writebyte;
                fileOutputStream.write(readbyte, 0, writebyte);
            }
            
            //System.out.println("THE WRITEBYTE VALUE IS "+writebyte+"THE READ BYTE VALUE IS"+count);
            inputStream.close();
            System.out.println("CONNECTION CLOSED");
            

        
    }

    /**
     * Create the frame.
     */
    public SwingControlServer() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 450, 300);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        contentPane.setLayout(new BorderLayout(0, 0));
        setContentPane(contentPane);
        
        
    }


}

这是客户端类

package newpack;

import java.awt.*;
import java.awt.event.*;
import java.io.File;
import java.io.FileInputStream;
import java.io.OutputStream;
import java.io.PrintStream;
import java.net.Socket;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.StringTokenizer;

import javax.swing.*;

import org.apache.commons.io.FileUtils;


 
public class SwingControlDemo extends JFrame {
    
   /**
     * 
     */
    private static final long serialVersionUID = 1L;
    private JFrame mainFrame;
   private JPanel controlPanel;
   private String filename;
   private String fname;
   private JProgressBar progressBar;
   private Task task;
   private JButton startButton;
   private JTextArea outputTextArea;
   private JTextField textField;
   private JLabel lblFilename;
   private JButton btnNewButton;
   private JButton btnCancel;
   private JLabel sendinglabel;
   private JLabel starttime;
   private JLabel endtime;
private JLabel sendinglabel1;
   
   
   public SwingControlDemo(){
      prepareGUI();
   }

   public static void main(String[] args){
      SwingControlDemo  swingControlDemo = new SwingControlDemo();      
      swingControlDemo.showProgressBarDemo();
   }

   private void prepareGUI(){
      mainFrame = new JFrame("Large File Upload");
      mainFrame.setSize(492,400);
      mainFrame.addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent windowEvent){
            System.exit(0);
         }        
      });
      mainFrame.getContentPane().setLayout(null);

      controlPanel = new JPanel();
      controlPanel.setBounds(0, 0, 491, 355);
      mainFrame.getContentPane().add(controlPanel);
      controlPanel.setLayout(null);
      mainFrame.setVisible(true);  
   }

   
   
   private void showProgressBarDemo(){
      controlPanel.setLayout(null);
      
      textField = new JTextField();
      textField.setBounds(125, 26, 105, 31);
      controlPanel.add(textField);
      textField.setColumns(10);
      
        sendinglabel=new JLabel("FIle is Sending...");
        sendinglabel.setBounds(10, 128, 168, 30);
        sendinglabel.setVisible(false);
        sendinglabel.setFont(new Font("Times New Roman", Font.PLAIN, 12));
        controlPanel.add(sendinglabel);
        
        sendinglabel1=new JLabel("FIle is Sending...");
        sendinglabel1.setBounds(51, 200, 250, 30);
        sendinglabel1.setVisible(false);
        sendinglabel1.setFont(new Font("Times New Roman", Font.PLAIN, 12));
        controlPanel.add(sendinglabel1);
        
        
        endtime = new JLabel("");
        endtime.setBounds(204, 200, 208, 33);
        endtime.setFont(new Font("Times New Roman", Font.PLAIN, 14));
        controlPanel.add(endtime);
        
        
        starttime = new JLabel("");
        starttime.setBounds(273, 141, 208, 33);
        starttime.setFont(new Font("Times New Roman", Font.PLAIN, 14));
        controlPanel.add(starttime);
        
      ProgressMonitor pc=new ProgressMonitor(SwingControlDemo.this, "Running My Program","", 0,10);
      
            
                  progressBar = new JProgressBar(0, 100);
                  progressBar.setBounds(62, 158, 146, 31);
                  progressBar.setValue(0);
                  progressBar.setStringPainted(true);
                  controlPanel.add(progressBar);
                  
                  
                  startButton = new JButton("Send");
                  startButton.setBounds(75, 82, 90, 31);
                  startButton.addActionListener(new ActionListener() {
                  private int i;

                @Override
                
                  public void actionPerformed(ActionEvent e) {
                    
                    task = new Task();                
                    task.start();
                    
                }});
                  
                        controlPanel.add(startButton);
                        
                              outputTextArea = new JTextArea("",5,20);
                              outputTextArea.setVisible(false);
                              outputTextArea.setBounds(51, 200, 164, 94);
                              controlPanel.add(outputTextArea);
                              
                              lblFilename = new JLabel("FileName");
                              lblFilename.setVisible(true);
                              lblFilename.setBounds(10, 26, 105, 31);
                              lblFilename.setFont(new Font("Times New Roman", Font.PLAIN, 14));
                              controlPanel.add(lblFilename);
                              
                              
                              btnNewButton = new JButton("Browse");
                              btnNewButton.setBounds(258, 26, 105, 31);
                              btnNewButton.addActionListener(new ActionListener() {
                                

                                

                                public void actionPerformed(ActionEvent arg0) {
                                    
                                    JFileChooser filedilg=new JFileChooser();
                                    filedilg.showOpenDialog(filedilg);
                                    filename=filedilg.getSelectedFile().getAbsolutePath();
                                    textField.setText(filename);
                                    
                                    File file1=new File(filename);
                                    fname = file1.getName();           
                                    System.out.println("THE FILE NAME IS "+fname);
                                }
                              });
                              btnNewButton.setFont(new Font("Times New Roman", Font.PLAIN, 14));
                              controlPanel.add(btnNewButton);
                              
                              btnCancel = new JButton("Cancel");
                              btnCancel.setBounds(182, 82, 90, 31);
                              btnCancel.addActionListener(new ActionListener() {
                                
                                @Override
                                public void actionPerformed(ActionEvent arg0) {
                                    // TODO Auto-generated method stub
                                System.exit(0); 
                                }
                            });
                              controlPanel.add(btnCancel);
                              mainFrame.setVisible(true);  
   }

   private class Task extends Thread {    
      public Task(){   }     

    public void run(){       
        
        PrintStream ps = null;      
        if(filename!=null)
        {
            DateFormat df=new SimpleDateFormat("HH:mm:ss");
            Calendar c=Calendar.getInstance();
            String starttime=df.format(c.getTime());
            System.out.println("Start time: "+starttime);
            
         try{
//To get current working directory
            String workingdirectory=System.getProperty("user.dir");
            System.out.println(workingdirectory);
//Create folder name as LogFolder in workingdirectory
            File file1=new File(workingdirectory+"\\LogFolder\\");
            
            File f2 = null;         
            //if folder not present we need to create a folder
            if (!file1.exists()) {
                if (file1.mkdir()) {
                    f2=new File(file1, "abc.txt");
                    System.out.println("Directory is created!");
                } else {
                    System.out.println("Failed to create directory!");
                }
                
            }f2=new File(file1, "abc.txt");
            ps=new PrintStream(f2);
            
                /* Try to connect to the server on localhost, port 5555 */
            sendinglabel.setVisible(true);
            SwingControlDemo.this.starttime.setText("Start time: "+starttime);
             
            JOptionPane.showMessageDialog(rootPane, "File is Sending...!!!");
            
          
           
            
            
            
                Socket socket=new Socket("localhost",10001);
                
                File file=new File(filename);
                             
               
              
                
                 
                double size=(file.length()/(1024*1024));
                //float size1=(float)size;  
                
                System.out.println("THE FILE SIZE IS "+size);
                //iterate();

                

                    byte[] mybyte=new byte[(int) file.length()];
                    
                    FileInputStream fileInputStream=new FileInputStream(file);
                    int count;
                    int i=0;
                    OutputStream outputStream=socket.getOutputStream();
                    
                    while((count=fileInputStream.read(mybyte))!=-1)
                    {
                        outputStream.write(mybyte);
                        i+=1;
                        
                        System.out.print("FIle Sent........"+i+"Kilobytes \t");
                        myFun(i, size);
                        
                    
                    
                }
                System.out.println();
                
                DateFormat df1=new SimpleDateFormat("HH:mm:ss");
                Calendar c1=Calendar.getInstance();
                String endtime=df1.format(c1.getTime());
                System.out.println("End time is : "+endtime);
                
                JOptionPane.showMessageDialog(rootPane, "File Sent Successfully!!!!\n Start Time is :"+starttime+"\n End Time Is : "+endtime);
                SwingControlDemo.this.endtime.setText(endtime);
                System.out.println("THIS FILE HAS BEEN SENT SUCCESSFULLY!!!");      
                
                

                socket.close();
                System.exit(1);
                
            

            }
        
            catch (Exception ex){
                /* Catch any errors */

                JOptionPane.showMessageDialog(rootPane, "Error While Sending File : "+ex.getMessage());
                ex.printStackTrace(ps);
                
            }
        }
        else
        {
            JOptionPane.showMessageDialog(rootPane, "Please Choose a Valid File");
        }
                    
        
        
        
        
         
      }

    private  void myFun(int j,Double mbsize) {
        // TODO Auto-generated method stub
        
        int per=(int) ((j*100)/mbsize);
        System.out.println("THE INTEGER VALUE IS "+per);
        if(j<mbsize)
        {
            System.out.println("INSIDE IF LOOP");
            progressBar.setValue(per);
            
        }
        else
        {
            progressBar.setValue(per);
            
        }
        try {
            Thread.sleep(10);
            
           
         } catch (InterruptedException e) {}
         
      }
        
    }
   }
于 2014-04-09T06:50:37.360 回答