Java框架在while循环中无法正确显示 [英] Java frame not displaying properly during a while loop
问题描述
在使用jFrame时，这是一个严重的问题.我有一个可以完成所有操作的主框架"，但是我还有另一个带有gif图像的框架(正在加载，该圆圈不断旋转)，用作启动屏幕，上面写着正在处理，请稍候" ，但是当我拉过该框架而我的while循环运行时，该框架变为空白，直到循环后才显示任何内容.
Here's a serious issue im having with a jFrame. I have one "Main Frame" where everything is done from, however i have another frame with a gif image in it (Loading, that circle that goes round and round), that is used as a splash screen saying "Processing, Please wait", however when i pull through that frame and my while loop runs, the frame goes blank and nothing displays until after the loop.
我认为这是由于while循环消耗了计算机资源并阻止"任何其他进程运行.
I am assuming that this is due to the while loop consuming computer resources and "blocking" any other process from running.
请告知我应该怎么做.
用于声明新框架的代码是标准代码，但无论如何我都会在下面发布.
the code for declaring the new frame is standard but i will post it anyway below.
Processing nc = new Processing();
nc.setVisible(true);
这是我的完整代码，因此您可以看到正在尝试实现的目标:
Here is my full code so you can see what im trying t achieve:
第1帧中的代码(Excel提取器):
Code from frame 1 (Excel Extractor):
Processing nc = new Processing();
nc.setVisible(true);
JFileChooser chooser = new JFileChooser();
chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
int option = chooser.showOpenDialog(this); // parentComponent must a component like JFrame, JDialog...
if (option == JFileChooser.APPROVE_OPTION) {
File selectedFile = chooser.getSelectedFile();
directory = selectedFile.getAbsolutePath();
System.out.println(directory);
}
//create a input stream for your excel file from which data will be read.
DateFormat dateFormat = new SimpleDateFormat("yyyy_MM_dd");
SimpleDateFormat sdf = new SimpleDateFormat("HHmmss");
String curdate = dateFormat.format(new Date());
Calendar cal = Calendar.getInstance();
cal.getTime();
String curtime = sdf.format(cal.getTime());
try{
FileInputStream excelSheetInput = new FileInputStream(path);
//POIFSFileSystem myFileSystem = new POIFSFileSystem(excelSheetInput);
XSSFWorkbook myWorkBook = new XSSFWorkbook(excelSheetInput);
//get first work sheet in your excel file.
Sheet sheet = myWorkBook.getSheetAt(0);
//we will read data in first rows(0) second column(1)
Iterator<Row> rowIterator = sheet.iterator();
Row myRow1 = sheet.getRow(0);
Cell myCell1 = myRow1.getCell(0);
String header="";
Iterator<Cell> cellIterator1 = myRow1.cellIterator();
int rowCount = 0;
while(cellIterator1.hasNext()) {
Cell cell1 = cellIterator1.next();
switch(cell1.getCellType()) {
case Cell.CELL_TYPE_BOOLEAN:
header = header + "\""+cell1.getBooleanCellValue()+"\"" + ",";
break;
case Cell.CELL_TYPE_NUMERIC:
cell1.setCellType(Cell.CELL_TYPE_STRING);
header = header + "\""+cell1.getStringCellValue()+"\""+",";
//System.out.print(cell.getStringCellValue() + "\t\t");
break;
case Cell.CELL_TYPE_STRING:
header = header + "\""+cell1.getStringCellValue()+"\""+",";
//System.out.print(cell.getStringCellValue() + "\t\t");
break;
}
}
Row myRow = sheet.getRow(1);
Cell myCell= myRow.getCell(0);
Iterator<Cell> cellIterator;
String firstCell = myCell.getStringCellValue();
int count =1;
String nextCell;
String Matter = "Matter Number: "+firstCell;
String num = firstCell;
System.out.println(Matter);
fWriter = new FileWriter(new File(directory, num+"_"+curdate+"_"+curtime+".csv"));
writer = new BufferedWriter(fWriter);
writer.write(Matter);
writer.newLine();
writer.write(header);
writer.newLine();
String temp;
while(rowIterator.hasNext())
{
//temp = "" + rowCount;
//jLabel5.setText(temp);
myRow = sheet.getRow(count);
cellIterator = myRow.cellIterator();
Cell myCell2 = myRow.getCell(0);
nextCell= myCell2.getStringCellValue();
if(nextCell.equals(firstCell))
{
while(cellIterator.hasNext()) {
Cell cell = cellIterator.next();
switch(cell.getCellType()) {
case Cell.CELL_TYPE_BOOLEAN:
System.out.print(cell.getBooleanCellValue() + "\t\t");
break;
case Cell.CELL_TYPE_NUMERIC:
cell.setCellType(Cell.CELL_TYPE_STRING);
System.out.print(cell.getStringCellValue()+",");
//System.out.print(cell.getStringCellValue() + "\t\t");
writer.write(cell.getStringCellValue()+",");
break;
case Cell.CELL_TYPE_STRING:
System.out.print(cell.getStringCellValue()+",");
//System.out.print(cell.getStringCellValue() + "\t\t");
writer.write(cell.getStringCellValue()+",");
break;
}
}
System.out.println();
writer.newLine();
count++;
rowCount++;
}
else
{
writer.close();
myRow = sheet.getRow(count);
myCell2= myRow.getCell(0);
nextCell=myCell2.getStringCellValue();
firstCell=nextCell;
Matter = "Matter Number: "+firstCell;
num = firstCell;
System.out.println(Matter);
fWriter = new FileWriter(new File(directory, num+"_"+curdate+"_"+curtime+".csv"));
writer = new BufferedWriter(fWriter);
writer.write(Matter);
writer.newLine();
writer.write(header);
writer.newLine();
}
}
}
catch (Exception e)
{
}
try {
nc.dispose();
writer.close();
} catch (IOException ex) {
Logger.getLogger(FileChooser.class.getName()).log(Level.SEVERE, null, ex);
}
}
第二帧代码(处理中):
The second frames code (Processing):
private void initComponents() {
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setFont(new java.awt.Font("Tahoma", 1, 14)); // NOI18N
jLabel1.setText("Processing, Please Wait...");
jLabel2.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
jLabel2.setIcon(new javax.swing.ImageIcon(getClass().getResource("/loading.gif"))); // NOI18N
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel1)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addComponent(jLabel2, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jLabel2)
.addContainerGap())
);
pack();
}
推荐答案
在不知道您尝试做的全部工作的情况下，您不可能完全获得确切的答案.
Without knowing the full extent of what you are trying to do, it's not entirely possible to you an exact answer.
从事物的声音中，您尝试在事件调度线程的上下文中运行长时间运行的任务.除其他事项外，该线程负责处理重画请求.
From the sounds of things your trying to run long running tasks within the context of the Event Dispatching Thread. This thread is responsible for, amongst other things, processing repaint requests.
阻止此线程，防止Swing重新绘制自身.
Blocking this thread, prevents Swing from repainting itself.
据我所知，您想使用 SwingWorker .这样，您就可以在后台线程中执行工作，同时将更新重新同步回EDT
From what I can tell, you want to use a SwingWorker. This will allow you to performing your work in a background thread, while re syncing updates back to the EDT
已更新示例
我知道您说过不希望使用SwingWorker，但是说实话，这只是更简单，更安全...
I know you said didn't "want" to use a SwingWorker, but to be honest, it's just simpler and safer...
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.GridBagLayout;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingWorker;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class LongRunningTask {
public static void main(String[] args) {
new LongRunningTask();
}
public LongRunningTask() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
new BackgroundWorker().start();
}
});
}
public class BackgroundWorker extends SwingWorker<Object, Object> {
private JFrame frame;
public BackgroundWorker() {
}
// Cause exeute is final :P
public void start() {
ImageIcon icon = new ImageIcon(getClass().getResource("/spinner.gif"));
JLabel label = new JLabel("This might take some time");
label.setIcon(icon);
frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new GridBagLayout());
frame.add(label);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
execute();
}
@Override
protected Object doInBackground() throws Exception {
System.out.println("Working hard...");
Thread.sleep(1000 + (((int)Math.round(Math.random() * 5)) * 1000));
System.out.println("Or hardly working...");
return null;
}
@Override
protected void done() {
frame.dispose();
}
}
}
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