请帮帮我，我想制作一个GUI文件，将文件从客户端上传到服务器。 当我点击浏览按钮然后文件以字节形式复制，因为我们在网络上以字节为单位传输数据，但是当我点击上传按钮时，文件无法上传。
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();
}
}
答案 0 :(得分：3)
您基本上在选择文件时读取文件的内容，丢弃内容，然后尝试将您从中读取的最后int值发送到服务器。一个文件我有很多很多字节长（想想千兆字节），int不能容纳那么多信息（差int）。
相反，当用户选择File时，您应该保留对它的引用，直到您确实需要它为止...
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) {
}
}
至少应该让你更近一步。
您可能遇到的下一个问题是，在转移过程中，用户界面将停止响应。
在这种情况下，您应该查看Concurrency in Swing。
现代用户界面需要处理客户端机器的许多不同特性，包括不同的字体，字体渲染功能，DPI，屏幕分辨率等等。通过使用绝对布局，你将自己置于一个非常黑暗和深深的洞中。
您应该利用布局管理器API，该API旨在简化这些问题的压力，使您的UI更适应不同的操作环境。
请查看Layout out Components within a Container了解更多详情
您可能还需要仔细查看Basic I/O和All about sockets了解更多详情......
答案 1 :(得分：0)
您只需复制并粘贴此代码即可帮助您....
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);
}
}
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) {}
}
}
}