我的问题是它只显示进度条中的两个输出0％（如果没有启动）和100％当程序完成扫描文件时。我希望它能够在扫描文件的同时立即显示该过程。（它不会更新进度条）任何帮助都会很棒。谢谢！ :)这是完整的代码：
import java.awt.event.ActionListener;
import javax.swing.Timer;
import java.io.File;
import java.io.FileOutputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.DataInputStream;
import java.io.FileReader;
import java.io.BufferedReader;
import javax.swing.JOptionPane;
import javax.swing.*;
import javax.swing.SwingWorker;
import javax.swing.SwingUtilities;
import java.util.List;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeEvent;
import
public class Log_in extends javax.swing.JFrame {
/**
* Creates new form Log_in
*/
FileOutputStream fos;
DataOutputStream dos;
FileInputStream fis ;
DataInputStream dis;
private Timer time;
private ActionListener ActionL;
public static String r;
public Log_in(){
setContentPane(new JLabel(new ImageIcon("C:\\Users\\Gondar\\Music\\bg.jpg")));
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jTextField1 = new javax.swing.JTextField();
jButton1 = new javax.swing.JButton();
jLabel1 = new javax.swing.JLabel();
jProgressBar1 = new javax.swing.JProgressBar();
jLabel2 = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jTextField1.setText("Student Name");
jTextField1.setToolTipText("Enter your profile name.");
jButton1.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jButton1.setText("Submit");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jLabel1.setFont(new java.awt.Font("Rockwell", 0, 26)); // NOI18N
jLabel1.setForeground(new java.awt.Color(255, 255, 255));
jLabel1.setText("Curriculum Simulator with Recommendation System");
jProgressBar1.setStringPainted(true);
jLabel2.setForeground(new java.awt.Color(102, 255, 102));
jLabel2.setText("Loading Profile....");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jProgressBar1, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGap(0, 208, Short.MAX_VALUE)
.addComponent(jLabel1)
.addGap(203, 203, 203))
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(477, 477, 477)
.addComponent(jLabel2))
.addGroup(layout.createSequentialGroup()
.addGap(465, 465, 465)
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 88, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addGap(420, 420, 420)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 182, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(83, 83, 83)
.addComponent(jLabel1)
.addGap(74, 74, 74)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 31, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(44, 44, 44)
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 40, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 244, Short.MAX_VALUE)
.addComponent(jLabel2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jProgressBar1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
);
pack();
}// </editor-fold>
SwingWorker sw= new SwingWorker<Boolean,Integer>() {
protected Boolean doInBackground() throws Exception {
try {
double lengthPerPercent = 100.0;
long readLength = 0;
FileReader fr=new FileReader("mario.txt");
BufferedReader br=new BufferedReader(fr);
while((r = br.readLine())!= null){
readLength += r.length();
jProgressBar1.setValue((int)(lengthPerPercent * readLength));
}
fr.close();
}catch(Exception err) {
System.out.println(err);
}
return true;
}
protected void process(List<Integer> chunks) {
for (Integer i : chunks)
jProgressBar1.setValue(i);
}
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jTextField1 = new javax.swing.JTextField();
jButton1 = new javax.swing.JButton();
jLabel1 = new javax.swing.JLabel();
jProgressBar1 = new javax.swing.JProgressBar();
jLabel2 = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jTextField1.setText("Student Name");
jTextField1.setToolTipText("Enter your profile name.");
jButton1.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jButton1.setText("Submit");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jLabel1.setFont(new java.awt.Font("Rockwell", 0, 26)); // NOI18N
jLabel1.setForeground(new java.awt.Color(255, 255, 255));
jLabel1.setText("Curriculum Simulator with Recommendation System");
jProgressBar1.setStringPainted(true);
jLabel2.setForeground(new java.awt.Color(102, 255, 102));
jLabel2.setText("Loading Profile....");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jProgressBar1, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGap(0, 208, Short.MAX_VALUE)
.addComponent(jLabel1)
.addGap(203, 203, 203))
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(477, 477, 477)
.addComponent(jLabel2))
.addGroup(layout.createSequentialGroup()
.addGap(465, 465, 465)
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 88, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addGap(420, 420, 420)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 182, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(83, 83, 83)
.addComponent(jLabel1)
.addGap(74, 74, 74)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 31, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(44, 44, 44)
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 40, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 244, Short.MAX_VALUE)
.addComponent(jLabel2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jProgressBar1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
);
pack();
}// </editor-fold>
protected void done() {
try {
if (jProgressBar1.getValue() == 100 )
jProgressBar1.setValue(100); // 100% done
else
System.out.println("ProcessingFailed.");
}
catch (Exception ex) {
System.out.println("Processing Failed.");
}
}
};
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
sw.execute();
/*try {
double lengthPerPercent = 100.0;
long readLength = 0;
FileReader fr=new FileReader("mario.txt");
BufferedReader br=new BufferedReader(fr);
while ((r = br.readLine()) != null) {
readLength += r.length();
jProgressBar1.setValue((int) Math.round(lengthPerPercent * readLength));
}
jProgressBar1.setValue(100);
fr.close();
if (jProgressBar1.getValue() == 100) {
}
}catch(Exception err) {
JOptionPane.showMessageDialog(this, err);
}
}
/**
* @param args the command line arguments
*/
}
public static void main(String args[]) throws Exception{
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Log_in().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JProgressBar jProgressBar1;
private javax.swing.JTextField jTextField1;
// End of variables declaration
}
答案 0 :(得分：2)
所以，你有两个基本问题，首先，你永远不会打电话给publish，所以永远不会打电话给process，其次，你的进度计算错了......
double lengthPerPercent = 100.0;
long readLength = 0;
FileReader fr=new FileReader("mario.txt");
BufferedReader br=new BufferedReader(fr);
while((r = br.readLine())!= null){
readLength += r.length();
jProgressBar1.setValue((int)(lengthPerPercent * readLength));
因此，如果您阅读10个字符，则进度值将为100 * 10，等于1000！
SwingWorker已经拥有“进度”支持，example
PropertyChangeListener更改时收到通知
所以，你的代码应该更像......
File file = new File("mario.txt");
try (BufferedReader br = new BufferedReader(new FileReader(file))) {
String r = null;
long fileLength = file.length();
long readLength = 0;
while ((r = br.readLine()) != null) {
readLength += r.length();
setProgress((int) (((float) readLength / (float) fileLength) * 100f);
}
}
然后，您会将PropertyChangeListener附加到SwingWorker的实例，并在progress属性更改时更新进度