Question

java中如何在拷贝文件时加入进度条，进度条跟文件拷贝进度一致

Answer 1

给你个例子，你再改进下

import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
public class JprogressBar extends JFrame implements Runnable {
public JprogressBar() {
initUI();
}
private void initUI() {
btCopy = new JButton("open file....");
JButton btCancel = new JButton("cancel");
JButton btSavePath = new JButton("save Path...");
copyFileProgressBar = new JProgressBar(0, 100);
copyFileProgressBar.setPreferredSize(new Dimension(450, 15));
copyFileProgressBar.setBackground(Color.GREEN);
copyFileProgressBar.setForeground(Color.PINK);
copyFileProgressBar.setStringPainted(true);
copyFileProgressBar.setVisible(false);
openFileDialog = new JFileChooser(".");
this.setLayout(new BorderLayout());
JPanel tmpPanel1 = new JPanel();
JPanel tmpPanel2 = new JPanel();
btCopy.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Thread t = new Thread(JprogressBar.this);
t.start();
}
});
btSavePath.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
savePath = setSavePath();
}
});
btCancel.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
stop = true;
btCopy.setEnabled(true);
}
});
tmpPanel1.add(btCopy);
tmpPanel1.add(btSavePath);
tmpPanel1.add(btCancel);
tmpPanel2.add(copyFileProgressBar);
this.add(tmpPanel1, BorderLayout.NORTH);
this.add(tmpPanel2, BorderLayout.SOUTH);
this.setTitle("read and copy file");
this.setPreferredSize(new Dimension(450, 95));
this.pack();
Dimension cd = centerIt(this);
this.setLocation(cd.width, cd.height);
final Dimension des = this.getPreferredSize();
this.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
stop = true;
System.exit(0);
}
public void windowStateChanged(WindowEvent e) {
System.out.println("ss");
if (e.paramString().equals("WINDOW_STATE_CHANGED")) {
System.out.println("ss");
JprogressBar.this.setSize(des);
}
}
});
this.addPropertyChangeListener(new PropertyChangeListener() {
public void propertyChange(PropertyChangeEvent evt) {
// System.out.println("ss");
// JprogressBar.this.setSize(des);
}
});
}
/*
* start read file..
*/
public void run() {
stop = false;
int c = openFileDialog.showOpenDialog(this);
if (c == JFileChooser.APPROVE_OPTION) {
try {
File selectFile = openFileDialog.getSelectedFile();
if (selectFile.equals(savePath)) {
JOptionPane.showMessageDialog(this, " \t target file and source file can't as the same !");
return;
}
if (savePath == null) {
JOptionPane.showMessageDialog(this, " \t please select a path to save file !");
return;
}
btCopy.setEnabled(false);
copyFileProgressBar.setVisible(true);
long size = selectFile.length();
copyFileProgressBar.setMaximum((int) size);
FileInputStream fin = new FileInputStream(selectFile);
FileOutputStream fout = new FileOutputStream(savePath);
byte[] buff = new byte[1024];
int s;
int count = 0;
long startTime = System.currentTimeMillis();
while ((s = fin.read(buff)) > 0 && !stop) {
count += s;
fout.write(buff, 0, s);
String str = "" + 100 * (count / (size + 0.01));
str = forMatString(str);
long endTime = System.currentTimeMillis();
String speedStr = getSpeed(count, startTime, endTime);
String remailTime = getRemailTime(count, size, startTime, endTime);
copyFileProgressBar.setString(" precent: " + str + " %" + " speed: " + speedStr + " " + " remail time : " + remailTime);
copyFileProgressBar.setValue(count);
}
fin.close();
fout.close();
if (!stop) {
JOptionPane.showMessageDialog(this, " \t copy file complete !");
}
stop = true;
savePath = null;
btCopy.setEnabled(true);
copyFileProgressBar.setValue(0);
copyFileProgressBar.setString("");
copyFileProgressBar.setVisible(false);
} catch (Exception ex) {
JOptionPane.showMessageDialog(this, "err:\n" + ex.getMessage());
}
}
}
/*
*select save file path
*/
private File setSavePath() {
File path = null;
int c = openFileDialog.showSaveDialog(this);
if (c == JFileChooser.APPROVE_OPTION) {
path = openFileDialog.getSelectedFile();
}
return path;
}
/*
* make frame center
*/
private Dimension centerIt(Component c) {
Dimension size = c.getSize();
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
int sH = screenSize.height;
int sW = screenSize.width;
int cW = size.width;
int cH = size.height;
return new Dimension((sW - cW) / 2, (sH - cH) / 2);
}
/*
* show copy file speed
*/
private String getSpeed(long readByte, long startTime, long endTime) {
long speed;
if (endTime - startTime != 0) {
speed = (readByte / (endTime - startTime)) * 1000;
if (speed > 1024 * 1024) {
return forMatString(speed / (1024 * 1024 + 0.1) + "") + " m/s";
} else if (speed > 1024) {
return forMatString(speed / (1024 + 0.1) + "") + " k/s";
} else {
return speed + " b/s";
}
} else {
return "0 b/s";
}
}
/*
* format string
*/
private String forMatString(String str) {
String values;
int index = str.indexOf(".");
values = str.substring(0, index + 3);
return values;
}
/*
* get remail time
*/
private String getRemailTime(long readByte, long totalByte, long startTime, long endTime) {
long hour;
long minute;
long second;
String h;
String m;
String s;
try {
long speed = readByte / (endTime - startTime);
long time = ((totalByte - readByte) / speed) / 1000;
hour = time / 3600;
minute = time % 3600 / 60;
second = time % 3600 % 60;
h = hour + "";
m = minute + "";
s = second + "";
if (hour < 10) {
m = "0" + minute;
}
if (minute < 10) {
m = "0" + minute;
}
if (second < 10) {
s = "0" + second;
}
return h + ":" + m + ":" + s;
} catch (Exception ex) {
return "00:00:00";
}
}
/*
* show frm
*/
public static void main(String[] args) {
JprogressBar frm = new JprogressBar();
frm.setVisible(true);
}
/*
*
*/
private JButton btCopy;
private JFileChooser openFileDialog;
private JProgressBar copyFileProgressBar;
private File savePath = null;
private boolean stop = false;
}

Answer 2

给你个例子，你再改进下

import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
public class JprogressBar extends JFrame implements Runnable {
public JprogressBar() {
initUI();
}
private void initUI() {
btCopy = new JButton("open file....");
JButton btCancel = new JButton("cancel");
JButton btSavePath = new JButton("save Path...");
copyFileProgressBar = new JProgressBar(0, 100);
copyFileProgressBar.setPreferredSize(new Dimension(450, 15));
copyFileProgressBar.setBackground(Color.GREEN);
copyFileProgressBar.setForeground(Color.PINK);
copyFileProgressBar.setStringPainted(true);
copyFileProgressBar.setVisible(false);
openFileDialog = new JFileChooser(".");
this.setLayout(new BorderLayout());
JPanel tmpPanel1 = new JPanel();
JPanel tmpPanel2 = new JPanel();
btCopy.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Thread t = new Thread(JprogressBar.this);
t.start();
}
});
btSavePath.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
savePath = setSavePath();
}
});
btCancel.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
stop = true;
btCopy.setEnabled(true);
}
});
tmpPanel1.add(btCopy);
tmpPanel1.add(btSavePath);
tmpPanel1.add(btCancel);
tmpPanel2.add(copyFileProgressBar);
this.add(tmpPanel1, BorderLayout.NORTH);
this.add(tmpPanel2, BorderLayout.SOUTH);
this.setTitle("read and copy file");
this.setPreferredSize(new Dimension(450, 95));
this.pack();
Dimension cd = centerIt(this);
this.setLocation(cd.width, cd.height);
final Dimension des = this.getPreferredSize();
this.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
stop = true;
System.exit(0);
}
public void windowStateChanged(WindowEvent e) {
System.out.println("ss");
if (e.paramString().equals("WINDOW_STATE_CHANGED")) {
System.out.println("ss");
JprogressBar.this.setSize(des);
}
}
});
this.addPropertyChangeListener(new PropertyChangeListener() {
public void propertyChange(PropertyChangeEvent evt) {
// System.out.println("ss");
// JprogressBar.this.setSize(des);
}
});
}
/*
* start read file..
*/
public void run() {
stop = false;
int c = openFileDialog.showOpenDialog(this);
if (c == JFileChooser.APPROVE_OPTION) {
try {
File selectFile = openFileDialog.getSelectedFile();
if (selectFile.equals(savePath)) {
JOptionPane.showMessageDialog(this, " \t target file and source file can't as the same !");
return;
}
if (savePath == null) {
JOptionPane.showMessageDialog(this, " \t please select a path to save file !");
return;
}
btCopy.setEnabled(false);
copyFileProgressBar.setVisible(true);
long size = selectFile.length();
copyFileProgressBar.setMaximum((int) size);
FileInputStream fin = new FileInputStream(selectFile);
FileOutputStream fout = new FileOutputStream(savePath);
byte[] buff = new byte[1024];
int s;
int count = 0;
long startTime = System.currentTimeMillis();
while ((s = fin.read(buff)) > 0 && !stop) {
count += s;
fout.write(buff, 0, s);
String str = "" + 100 * (count / (size + 0.01));
str = forMatString(str);
long endTime = System.currentTimeMillis();
String speedStr = getSpeed(count, startTime, endTime);
String remailTime = getRemailTime(count, size, startTime, endTime);
copyFileProgressBar.setString(" precent: " + str + " %" + " speed: " + speedStr + " " + " remail time : " + remailTime);
copyFileProgressBar.setValue(count);
}
fin.close();
fout.close();
if (!stop) {
JOptionPane.showMessageDialog(this, " \t copy file complete !");
}
stop = true;
savePath = null;
btCopy.setEnabled(true);
copyFileProgressBar.setValue(0);
copyFileProgressBar.setString("");
copyFileProgressBar.setVisible(false);
} catch (Exception ex) {
JOptionPane.showMessageDialog(this, "err:\n" + ex.getMessage());
}
}
}
/*
*select save file path
*/
private File setSavePath() {
File path = null;
int c = openFileDialog.showSaveDialog(this);
if (c == JFileChooser.APPROVE_OPTION) {
path = openFileDialog.getSelectedFile();
}
return path;
}
/*
* make frame center
*/
private Dimension centerIt(Component c) {
Dimension size = c.getSize();
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
int sH = screenSize.height;
int sW = screenSize.width;
int cW = size.width;
int cH = size.height;
return new Dimension((sW - cW) / 2, (sH - cH) / 2);
}
/*
* show copy file speed
*/
private String getSpeed(long readByte, long startTime, long endTime) {
long speed;
if (endTime - startTime != 0) {
speed = (readByte / (endTime - startTime)) * 1000;
if (speed > 1024 * 1024) {
return forMatString(speed / (1024 * 1024 + 0.1) + "") + " m/s";
} else if (speed > 1024) {
return forMatString(speed / (1024 + 0.1) + "") + " k/s";
} else {
return speed + " b/s";
}
} else {
return "0 b/s";
}
}
/*
* format string
*/
private String forMatString(String str) {
String values;
int index = str.indexOf(".");
values = str.substring(0, index + 3);
return values;
}
/*
* get remail time
*/
private String getRemailTime(long readByte, long totalByte, long startTime, long endTime) {
long hour;
long minute;
long second;
String h;
String m;
String s;
try {
long speed = readByte / (endTime - startTime);
long time = ((totalByte - readByte) / speed) / 1000;
hour = time / 3600;
minute = time % 3600 / 60;
second = time % 3600 % 60;
h = hour + "";
m = minute + "";
s = second + "";
if (hour < 10) {
m = "0" + minute;
}
if (minute < 10) {
m = "0" + minute;
}
if (second < 10) {
s = "0" + second;
}
return h + ":" + m + ":" + s;
} catch (Exception ex) {
return "00:00:00";
}
}
/*
* show frm
*/
public static void main(String[] args) {
JprogressBar frm = new JprogressBar();
frm.setVisible(true);
}
/*
*
*/
private JButton btCopy;
private JFileChooser openFileDialog;
private JProgressBar copyFileProgressBar;
private File savePath = null;
private boolean stop = false;
}

Answer 3

我给你提供思路，自己去实现。
1、你用的是SSH框架，spring有一个MultipartFile技术，支持单文件和多文件上传
2、下载直接用BufferedInputStream+BufferedOutputStream去实现就可以了。
这两个都是很好学的。挺简单的