如何在Java中搜索子文件夹并使用新数据重新绘制jTable?
我的程序有几个问题。我想要一个jTable来显示添加到其TableModel中的各种数据点,但我似乎无法用新数据更新表 另外,我在一个目录中搜索png图像似乎没有完全搜索目录中的所有png图像,并且只在第一个文件夹的内容处停止搜索 我已将所有数据点放置到适合其数据类型的ArrayList中,并将其转换为对象数组,然后再将其放置在jTable的TableModel中。它不起作用,而且我还没有用自己的知识解决这些问题 一些代码:如何在Java中搜索子文件夹并使用新数据重新绘制jTable?,java,swing,file,jtable,repaint,Java,Swing,File,Jtable,Repaint,我的程序有几个问题。我想要一个jTable来显示添加到其TableModel中的各种数据点,但我似乎无法用新数据更新表 另外,我在一个目录中搜索png图像似乎没有完全搜索目录中的所有png图像,并且只在第一个文件夹的内容处停止搜索 我已将所有数据点放置到适合其数据类型的ArrayList中,并将其转换为对象数组,然后再将其放置在jTable的TableModel中。它不起作用,而且我还没有用自己的知识解决这些问题 一些代码: private void btnPatchSelActionPerfo
private void btnPatchSelActionPerformed(java.awt.event.ActionEvent evt) {
fchsFolderChooser.showOpenDialog(null);
File selFile = fchsFolderChooser.getSelectedFile();
fldPatchSel.setText(selFile.getPath());
File pngs[] = selFile.listFiles(IMAGE_FILTER);
for (File png : pngs) {
try {BufferedImage img = ImageIO.read(png);
patchWs.add(img.getWidth()); patchHs.add(img.getHeight());
patchDims.add(img.getWidth() + "x" + img.getHeight());
patchImgs.add(img); patchImgPaths.add(png.getPath());
sels.add(false);
System.out.println("Found " + png.getPath());
} catch (IOException e) {
System.out.println("Bad image: " + png); e.printStackTrace();
}
}
if(!(fldPatchSel.getText().endsWith("...")||fldModSel.getText().endsWith("..."))) {BuildTable();}
}
mod asset selection的对应项类似,但未设置sels ArrayList
private void BuildTable(){
DefaultTableModel model = (DefaultTableModel) tblImgList.getModel();
Object[] boolSels = sels.toArray();
Object[] stringPatchPaths = patchImgPaths.toArray();
Object[] stringPatchImgDims = patchDims.toArray();
model.addColumn("", boolSels);
model.addColumn("Patch Image", stringPatchPaths);
model.addColumn("W x H", stringPatchImgDims);
tblImgList.repaint();
}
你将如何解决我的两个问题?程序未搜索子文件夹,无法在表中显示新数据。首先,删除
DefaultTableModel
,您的数据模型变得越来越复杂。从一个POJO(普通的旧Java对象)开始,它包装了您想要显示的内容的上下文
public class ImageProperty {
private File source;
private Dimension size;
private boolean selected;
public ImageProperty(File source, Dimension size, boolean selected) {
this.source = source;
this.size = size;
this.selected = selected;
}
public Dimension getSize() {
return size;
}
public File getSource() {
return source;
}
public boolean isSelected() {
return selected;
}
}
它保存单个图像文件的所有信息,并将用于表示表中某一行的内容
其次,创建一个自定义的表格模型
。这是一种个人的事情,但是使用DefaultTableModel
,你会花费更多的时间来破解它,试图让它做你想做的事情,而使用你自己的解决方案会更好
public class ImageTableModel extends AbstractTableModel {
private List<ImageProperty> images;
public ImageTableModel() {
images = new ArrayList<ImageProperty>(25);
}
@Override
public int getRowCount() {
return images.size();
}
@Override
public int getColumnCount() {
return 4;
}
@Override
public String getColumnName(int column) {
String name = "";
switch (column) {
case 1:
name = "Path";
break;
case 2:
name = "Name";
break;
case 3:
name = "Size";
break;
}
return name;
}
@Override
public Class<?> getColumnClass(int columnIndex) {
return columnIndex == 0 ? Boolean.class : String.class;
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
ImageProperty row = images.get(rowIndex);
Object value = null;
switch (columnIndex) {
case 0:
value = row.isSelected();
break;
case 1:
value = row.getSource().getParent();
break;
case 2:
value = row.getSource().getName();
break;
case 3:
value = row.getSize().width + "x" + row.getSize().height;
break;
}
return value;
}
public void addImage(ImageProperty image) {
images.add(image);
fireTableRowsInserted(images.size() - 1, images.size() - 1);
}
public void addImages(List<ImageProperty> newImages) {
int firstRow = images.size();
int lastRow = firstRow + newImages.size() - 1;
images.addAll(newImages);
fireTableRowsInserted(firstRow, lastRow);
}
public void clear() {
int lastRow = images.size() -1;
images.clear();
fireTableRowsDeleted(0, lastRow);
}
}
此工作程序使用递归方法调用扫描子目录
最后,胶水
此代码段禁用“扫描”按钮,清除当前表格模型,创建SwingWorker
,并向其注册PropertyChangeListener
,最后启动worker
model.clear();
scan.setEnabled(false);
ScanWorker worker = new ScanWorker(new File("..."), model);
worker.addPropertyChangeListener(new PropertyChangeListener() {
@Override
public void propertyChange(PropertyChangeEvent evt) {
if ("state".equalsIgnoreCase(evt.getPropertyName())) {
SwingWorker.StateValue state = (SwingWorker.StateValue) evt.getNewValue();
scan.setEnabled(state == SwingWorker.StateValue.DONE);
scan.setText("Scan");
} else if ("directory".equalsIgnoreCase(evt.getPropertyName())) {
scan.setText(text);
}
}
});
worker.execute();
PropertyChangeListener
监视工作进程状态的更改,并在完成时将按钮重置为enabled(启用)。它还监视扫描目录的更改,并更新按钮的文本以反映当前已处理的目录…很好
上面的代码段由“扫描”按钮上的ActionListener
触发
一个很好的可运行的例子
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.File;
import java.io.FileFilter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.imageio.ImageIO;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingWorker;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.AbstractTableModel;
public class ShowImages {
public static void main(String[] args) {
new ShowImages();
}
public ShowImages() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
final ImageTableModel model = new ImageTableModel();
JTable table = new JTable(model);
final JButton scan = new JButton("Scan");
scan.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
model.clear();
scan.setEnabled(false);
ScanWorker worker = new ScanWorker(new File("C:\\Users\\shane\\Dropbox\\MegaTokyo"), model);
worker.addPropertyChangeListener(new PropertyChangeListener() {
@Override
public void propertyChange(PropertyChangeEvent evt) {
if ("state".equalsIgnoreCase(evt.getPropertyName())) {
SwingWorker.StateValue state = (SwingWorker.StateValue) evt.getNewValue();
scan.setEnabled(state == SwingWorker.StateValue.DONE);
scan.setText("Scan");
} else if ("directory".equalsIgnoreCase(evt.getPropertyName())) {
String text = ((File)evt.getNewValue()).getPath().replaceAll("shane", "...");
text = text.replaceAll("C:\\\\", "...");
text = text.replaceAll("Dropbox", "...");
scan.setText(text);
}
}
});
worker.execute();
}
});
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new JScrollPane(table));
frame.add(scan, BorderLayout.SOUTH);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class ImageProperty {
private File source;
private Dimension size;
private boolean selected;
public ImageProperty(File source, Dimension size, boolean selected) {
this.source = source;
this.size = size;
this.selected = selected;
}
public Dimension getSize() {
return size;
}
public File getSource() {
return source;
}
public boolean isSelected() {
return selected;
}
}
public class ImageTableModel extends AbstractTableModel {
private List<ImageProperty> images;
public ImageTableModel() {
images = new ArrayList<ImageProperty>(25);
}
@Override
public int getRowCount() {
return images.size();
}
@Override
public int getColumnCount() {
return 4;
}
@Override
public String getColumnName(int column) {
String name = "";
switch (column) {
case 1:
name = "Path";
break;
case 2:
name = "Name";
break;
case 3:
name = "Size";
break;
}
return name;
}
@Override
public Class<?> getColumnClass(int columnIndex) {
return columnIndex == 0 ? Boolean.class : String.class;
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
ImageProperty row = images.get(rowIndex);
Object value = null;
switch (columnIndex) {
case 0:
value = row.isSelected();
break;
case 1:
value = row.getSource().getParent();
break;
case 2:
value = row.getSource().getName();
break;
case 3:
value = row.getSize().width + "x" + row.getSize().height;
break;
}
return value;
}
public void addImage(ImageProperty image) {
images.add(image);
fireTableRowsInserted(images.size() - 1, images.size() - 1);
}
public void addImages(List<ImageProperty> newImages) {
int firstRow = images.size();
int lastRow = firstRow + newImages.size() - 1;
images.addAll(newImages);
fireTableRowsInserted(firstRow, lastRow);
}
public void clear() {
int lastRow = images.size() -1;
images.clear();
fireTableRowsDeleted(0, lastRow);
}
}
public class ScanWorker extends SwingWorker<Object, ImageProperty> {
private File source;
private ImageTableModel model;
public ScanWorker(File source, ImageTableModel model) {
this.source = source;
this.model = model;
}
@Override
protected void process(List<ImageProperty> chunks) {
model.addImages(chunks);
}
@Override
protected Object doInBackground() throws Exception {
scan(source);
return null;
}
protected void scan(File dir) {
firePropertyChange("directory", dir.getParent(), dir);
File pngs[] = dir.listFiles(new FileFilter() {
@Override
public boolean accept(File pathname) {
return pathname.getName().toLowerCase().endsWith(".png");
}
});
for (File png : pngs) {
try {
BufferedImage img = ImageIO.read(png);
publish(new ImageProperty(png, new Dimension(img.getWidth(), img.getHeight()), false));
} catch (IOException e) {
System.out.println("Bad image: " + png);
e.printStackTrace();
}
}
File dirs[] = dir.listFiles(new FileFilter() {
@Override
public boolean accept(File pathname) {
return pathname.isDirectory();
}
});
if (dirs != null && dirs.length > 0) {
for (File subDir : dirs) {
scan(subDir);
}
}
}
}
}
导入java.awt.BorderLayout;
导入java.awt.Dimension;
导入java.awt.EventQueue;
导入java.awt.event.ActionEvent;
导入java.awt.event.ActionListener;
导入java.awt.image.buffereImage;
导入java.beans.PropertyChangeEvent;
导入java.beans.PropertyChangeListener;
导入java.io.File;
导入java.io.FileFilter;
导入java.io.IOException;
导入java.util.ArrayList;
导入java.util.List;
导入javax.imageio.imageio;
导入javax.swing.JButton;
导入javax.swing.JFrame;
导入javax.swing.JScrollPane;
导入javax.swing.JTable;
导入javax.swing.SwingWorker;
导入javax.swing.UIManager;
导入javax.swing.UnsupportedLookAndFeelException;
导入javax.swing.table.AbstractTableModel;
公开课展示图片{
公共静态void main(字符串[]args){
新ShowImages();
}
公开展览图片(){
invokeLater(新的Runnable(){
@凌驾
公开募捐{
试一试{
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
}catch(ClassNotFoundException |实例化Exception | IllegalacessException |不支持ookandfeelException ex){
例如printStackTrace();
}
最终ImageTableModel=新ImageTableModel();
JTable table=新的JTable(模型);
最终JButton扫描=新JButton(“扫描”);
scan.addActionListener(新ActionListener(){
@凌驾
已执行的公共无效操作(操作事件e){
model.clear();
scan.setEnabled(false);
ScanWorker=new ScanWorker(新文件(“C:\\Users\\shane\\Dropbox\\MegaTokyo”),型号);
worker.addPropertyChangeListener(新的PropertyChangeListener(){
@凌驾
公共作废属性更改(属性更改事件evt){
if(“state.equalsIgnoreCase(evt.getPropertyName())){
SwingWorker.StateValue状态=(SwingWorker.StateValue)evt.getNewValue();
scan.setEnabled(state==SwingWorker.StateValue.DONE);
scan.setText(“scan”);
}else if(“directory.equalsIgnoreCase(evt.getPropertyName())){
字符串文本=((文件)evt.getNewValue()).getPath().replaceAll(“shane”,“…”);
text=text.replaceAll(“C:\\\”,“…”);
text=text.replaceAll(“Dropbox”、“…”);
scan.setText(文本);
}
}
});
worker.execute();
}
});
JFrame=新JFrame(“测试”);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(新的JScrollPane(表));
帧。添加(扫描,边界布局。南);
frame.pack();
frame.setLocationRelativeTo(空);
frame.setVisible(true);
}
});
}
公共类ImageProperty{
私有文件源;
私有维度大小;
选择私有布尔值;
公共ImageProperty(文件源、维度大小、布尔值已选定){
this.source=源;
这个。大小=大小;
this.selected=selected;
}
公共维度getSize(){
返回si
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.File;
import java.io.FileFilter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.imageio.ImageIO;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingWorker;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.AbstractTableModel;
public class ShowImages {
public static void main(String[] args) {
new ShowImages();
}
public ShowImages() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
final ImageTableModel model = new ImageTableModel();
JTable table = new JTable(model);
final JButton scan = new JButton("Scan");
scan.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
model.clear();
scan.setEnabled(false);
ScanWorker worker = new ScanWorker(new File("C:\\Users\\shane\\Dropbox\\MegaTokyo"), model);
worker.addPropertyChangeListener(new PropertyChangeListener() {
@Override
public void propertyChange(PropertyChangeEvent evt) {
if ("state".equalsIgnoreCase(evt.getPropertyName())) {
SwingWorker.StateValue state = (SwingWorker.StateValue) evt.getNewValue();
scan.setEnabled(state == SwingWorker.StateValue.DONE);
scan.setText("Scan");
} else if ("directory".equalsIgnoreCase(evt.getPropertyName())) {
String text = ((File)evt.getNewValue()).getPath().replaceAll("shane", "...");
text = text.replaceAll("C:\\\\", "...");
text = text.replaceAll("Dropbox", "...");
scan.setText(text);
}
}
});
worker.execute();
}
});
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new JScrollPane(table));
frame.add(scan, BorderLayout.SOUTH);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class ImageProperty {
private File source;
private Dimension size;
private boolean selected;
public ImageProperty(File source, Dimension size, boolean selected) {
this.source = source;
this.size = size;
this.selected = selected;
}
public Dimension getSize() {
return size;
}
public File getSource() {
return source;
}
public boolean isSelected() {
return selected;
}
}
public class ImageTableModel extends AbstractTableModel {
private List<ImageProperty> images;
public ImageTableModel() {
images = new ArrayList<ImageProperty>(25);
}
@Override
public int getRowCount() {
return images.size();
}
@Override
public int getColumnCount() {
return 4;
}
@Override
public String getColumnName(int column) {
String name = "";
switch (column) {
case 1:
name = "Path";
break;
case 2:
name = "Name";
break;
case 3:
name = "Size";
break;
}
return name;
}
@Override
public Class<?> getColumnClass(int columnIndex) {
return columnIndex == 0 ? Boolean.class : String.class;
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
ImageProperty row = images.get(rowIndex);
Object value = null;
switch (columnIndex) {
case 0:
value = row.isSelected();
break;
case 1:
value = row.getSource().getParent();
break;
case 2:
value = row.getSource().getName();
break;
case 3:
value = row.getSize().width + "x" + row.getSize().height;
break;
}
return value;
}
public void addImage(ImageProperty image) {
images.add(image);
fireTableRowsInserted(images.size() - 1, images.size() - 1);
}
public void addImages(List<ImageProperty> newImages) {
int firstRow = images.size();
int lastRow = firstRow + newImages.size() - 1;
images.addAll(newImages);
fireTableRowsInserted(firstRow, lastRow);
}
public void clear() {
int lastRow = images.size() -1;
images.clear();
fireTableRowsDeleted(0, lastRow);
}
}
public class ScanWorker extends SwingWorker<Object, ImageProperty> {
private File source;
private ImageTableModel model;
public ScanWorker(File source, ImageTableModel model) {
this.source = source;
this.model = model;
}
@Override
protected void process(List<ImageProperty> chunks) {
model.addImages(chunks);
}
@Override
protected Object doInBackground() throws Exception {
scan(source);
return null;
}
protected void scan(File dir) {
firePropertyChange("directory", dir.getParent(), dir);
File pngs[] = dir.listFiles(new FileFilter() {
@Override
public boolean accept(File pathname) {
return pathname.getName().toLowerCase().endsWith(".png");
}
});
for (File png : pngs) {
try {
BufferedImage img = ImageIO.read(png);
publish(new ImageProperty(png, new Dimension(img.getWidth(), img.getHeight()), false));
} catch (IOException e) {
System.out.println("Bad image: " + png);
e.printStackTrace();
}
}
File dirs[] = dir.listFiles(new FileFilter() {
@Override
public boolean accept(File pathname) {
return pathname.isDirectory();
}
});
if (dirs != null && dirs.length > 0) {
for (File subDir : dirs) {
scan(subDir);
}
}
}
}
}