Java 从文件系统加载对象后更新GUI
我是一名Java新手，正在进行我的第一个Java项目。到目前为止，它由一个带有动态生成表单（改编自）的GUI、一个保存按钮和一个加载按钮组成。使用“保存”按钮，整个表单保存为对象，使用“加载”按钮，可以加载现有保存的表单。保存和加载本身似乎可以正常工作，但在加载按钮的Java 从文件系统加载对象后更新GUI,java,swing,serialization,Java,Swing,Serialization,我是一名Java新手，正在进行我的第一个Java项目。到目前为止，它由一个带有动态生成表单（改编自）的GUI、一个保存按钮和一个加载按钮组成。使用“保存”按钮，整个表单保存为对象，使用“加载”按钮，可以加载现有保存的表单。保存和加载本身似乎可以正常工作，但在加载按钮的actionPerformed方法中，当我（间接地，即通过另一个函数）调用revalidate（）和repaint（）时，GUI没有使用加载的表单正确更新： 在此，panel属于JPanel的一个子类： public class S
actionPerformedrevalidate（）repaint（）panelJPanelpublic class ScrollBar extends JPanel {
private static final long serialVersionUID = -3460555902426579496L;
private JScrollPane scrollPane;
private JButton saveList, loadList;
private EntryList entryList;
@SuppressWarnings("hiding")
public ScrollBar(EntryList entryList, MainFrame frame) {
scrollPane = new JScrollPane(entryList,
ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
scrollPane.setPreferredSize(new Dimension(300,400));
this.entryList = entryList;
saveList = new JButton("Save List");
saveList.addActionListener(new SaveListener("Save List", this));
loadList = new JButton("Load List");
loadList.addActionListener(new LoadListener("Load List", this));
add(scrollPane);
add(saveList);
add(loadList);
}
public EntryList getEntryList() {
return entryList;
}
public void setEntryList(EntryList list) {
entryList = list;
this.saveList.setBackground(Color.PINK);
this.saveList.setText(entryList.getFirstText());
this.loadList.setBackground(Color.GREEN);
revalidate();
repaint();
}
}
public class Entry extends JPanel implements Serializable{
private static final long serialVersionUID = 8748191176188997955L;
private JTextField textField;
private JButton plus;
private JButton minus;
private EntryList parent;
public Entry(String textFieldText, EntryList list) {
this.parent = list;
this.plus = new JButton(new AddEntryAction());
this.minus = new JButton(new RemoveEntryAction());
this.textField = new JTextField(10);
this.textField.setText(textFieldText);
add(this.plus);
add(this.minus);
add(this.textField);
}
public String getText() {
return this.textField.getText();
}
public class AddEntryAction extends AbstractAction {
private static final long serialVersionUID = -1936452299010320790L;
public AddEntryAction() {
super("+");
}
public void actionPerformed(ActionEvent e) {
parent.cloneEntry(Entry.this);
}
}
public class RemoveEntryAction extends AbstractAction {
private static final long serialVersionUID = 4843871176230776949L;
public RemoveEntryAction() {
super("-");
}
public void actionPerformed(ActionEvent e) {
parent.removeItem(Entry.this);
}
}
public void enableAdd(boolean enabled) {
this.plus.setEnabled(enabled);
}
public void enableMinus(boolean enabled) {
this.minus.setEnabled(enabled);
}
}
public class EntryList extends JPanel implements Serializable{
private static final long serialVersionUID = 1426379083556312697L;
private List<Entry> entries;
public EntryList() {
this.entries = new ArrayList<Entry>();
Entry initial = new Entry("debugtext", this);
addItem(initial);
}
public int getLength() {
return this.entries.size();
}
public String getFirstText() {
return this.entries.get(0).getText();
}
public void cloneEntry(Entry entry) {
Entry theClone = new Entry("", this);
addItem(theClone);
}
private void addItem(Entry entry) {
entries.add(entry);
add(entry);
refresh();
}
public void removeItem(Entry entry) {
entries.remove(entry);
remove(entry);
refresh();
}
private void refresh() {
revalidate();
if (entries.size() == 1) {
entries.get(0).enableMinus(false);
}
else {
for (Entry e : entries) {
e.enableMinus(true);
}
}
}
}
public class SaveListener extends DirectoryChooser implements ActionListener {
private static final long serialVersionUID = -8842006866700189526L;
private EntryList list;
private String filename;
public SaveListener(String choosertitle, ScrollBar bar) {
super(choosertitle, false);
this.list = bar.getEntryList();
}
@Override
public void actionPerformed(ActionEvent e) {
super.actionPerformed(e);
try {
filename = this.getResultsDirectory();
OutputStream os = new FileOutputStream(filename);
ObjectOutputStream oos = new ObjectOutputStream(os);
oos.writeObject(list);
oos.close();
System.out.println("Length of list at saving = " + this.list.getLength());
System.out.println("Length of list at saving = " + this.list.getFirstText());
} catch (FileNotFoundException e1) {
System.out.println("File not found: " + filename);
e1.printStackTrace();
} catch (IOException e1) {
System.out.println("IO Exception: " + e1);
e1.printStackTrace();
}
}
}
public class DirectoryChooser extends JPanel implements ActionListener {
private static final long serialVersionUID = -8143869075088499054L;
private JButton setwd;
private String workingdir;
private JFileChooser chooser;
private String choosertitle;
private boolean directoryOnly = true;
@SuppressWarnings("hiding")
public DirectoryChooser(String choosertitle) {
this.choosertitle = choosertitle;
setwd = new JButton(choosertitle);
setwd.addActionListener(this);
add(setwd);
workingdir = new File(System.getProperty("user.dir")).toString();
}
@SuppressWarnings("hiding")
public DirectoryChooser(String choosertitle, boolean directoryOnly) {
this(choosertitle);
this.directoryOnly = directoryOnly;
}
public void actionPerformed(ActionEvent e) {
chooser = new JFileChooser();
chooser.setCurrentDirectory(new java.io.File("."));
chooser.setDialogTitle(choosertitle);
if (directoryOnly) {
chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
}
chooser.setAcceptAllFileFilterUsed(false);
if (chooser.showOpenDialog(this) == JFileChooser.APPROVE_OPTION) {
workingdir = chooser.getSelectedFile().toString();
} else {
workingdir = chooser.getCurrentDirectory().toString();
}
}
public String getResultsDirectory() {
return workingdir;
}
public Dimension getPreferredSize(){
return new Dimension(200, 200);
}
}
public class SingleFileChooser extends JPanel implements ActionListener {
private static final long serialVersionUID = -9068219101747975546L;
private JButton loadFiles;
private JFileChooser chooser;
private String choosertitle;
private File file;
private String filePath;
private FileNameExtensionFilter filter;
@SuppressWarnings("hiding")
public SingleFileChooser(String choosertitle) {
this.choosertitle = choosertitle;
loadFiles = new JButton(choosertitle);
loadFiles.addActionListener(this);
add(loadFiles);
}
@SuppressWarnings("hiding")
public SingleFileChooser(String choosertitle, FileNameExtensionFilter filter) {
this(choosertitle);
this.filter = filter;
}
public void actionPerformed(ActionEvent e) {
chooser = new JFileChooser();
chooser.setMultiSelectionEnabled(false);
if (filter != null) {
chooser.setFileFilter(filter);
}
chooser.setDialogTitle(choosertitle);
chooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
int returnVal = chooser.showOpenDialog(null);
if(returnVal == JFileChooser.APPROVE_OPTION) {
file = chooser.getSelectedFile();
filePath = file.getAbsolutePath();
}
}
public File getFile() {
return file;
}
public String getFilePath(){
return filePath;
}
public Dimension getPreferredSize(){
return new Dimension(200, 200);
}
}
public class MainFrame extends JFrame {
private static final long serialVersionUID = 512941639567306317L;
EntryList panel = new EntryList();
ScrollBar scrollPanel = new ScrollBar(panel, this);
public MainFrame() throws HeadlessException {
this.getContentPane().add(scrollPanel);
this.setLayout(new BoxLayout(this.getContentPane(), BoxLayout.Y_AXIS));
}
}
public class GUImain {
public static void main(String[] args) {
MainFrame frame = new MainFrame();
frame.pack();
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null); // center the window
}
}
公共类条目扩展JPanel实现可序列化{
私有静态最终长serialVersionUID=8748191176188997955L；
私有JTextField textField；
私人JButton plus；
私有JButton减号；
私有入口列表父级；
公共条目（字符串文本字段文本，条目列表）{
this.parent=列表；
this.plus=new JButton（new AddEntryAction（））；
this.减号=new JButton（new removentryAction（））；
this.textField=新的JTextField（10）；
this.textField.setText（textFieldText）；
加上（这个加上）；
加（这个减）；
添加（this.textField）；
}
公共字符串getText（）{
返回此.textField.getText（）；
}
公共类AddEntryAction扩展了AbstractAction{
私有静态最终长serialVersionUID=-193645229910320790L；
公共AddEntryAction（）{
超级（“+”）；
}
已执行的公共无效操作（操作事件e）{
parent.cloneEntry（Entry.this）；
}
}
公共类RemoveEntryAction扩展了AbstractAction{
私有静态最终长serialVersionUID=484387117623077694L；
公共RemoveEntryAction（）{
超级（“-”）；
}
已执行的公共无效操作（操作事件e）{
parent.removietem（Entry.this）；
}
}
public void enableAdd（已启用布尔值）{
此.plus.setEnabled（已启用）；
}
public void enableMinus（已启用布尔值）{
此.减.setEnabled（已启用）；
}
}
公共类EntryList扩展了JPanel实现可序列化{
私有静态最终长serialVersionUID=1426379083556312697L；
私人名单条目；
公共条目列表（）{
this.entries=new ArrayList（）；
条目初始值=新条目（“调试文本”，本）；
附加项（首字母）；
}
公共整数getLength（）{
返回此.entries.size（）；
}
公共字符串getFirstText（）{
返回this.entries.get（0.getText（）；
}
公共无效克隆入口（入口）{
条目克隆=新条目（“，this）；
附加项（克隆）；
}
专用作废附加项（条目）{
条目。添加（条目）；
添加（条目）；
刷新（）；
}
公共无效删除项（条目）{
条目。删除（条目）；
移走（进入）；
刷新（）；
}
私有无效刷新（）{
重新验证（）；
if（entries.size（）==1）{
entries.get（0）.enableMinus（false）；
}
否则{
对于（条目e：条目）{
e、 启用最小值（真）；
}
}
}
}
公共类SaveListener扩展DirectoryChooser实现ActionListener{
私有静态最终长serialVersionUID=-8842006866700189526L；
私有入口列表；
私有字符串文件名；
公共存储侦听器（字符串选择器标题、滚动条）{
super（choosertitle，false）；
this.list=bar.getEntryList（）；
}
@凌驾
已执行的公共无效操作（操作事件e）{
super.执行的行动（e）；
试一试{
filename=this.getResultsDirectory（）；
OutputStream os=新文件OutputStream（文件名）；
ObjectOutputStream oos=新的ObjectOutputStream（os）；
oos.writeObject（列表）；
oos.close（）；
System.out.println（“保存时的列表长度=“+this.list.getLength（））；
System.out.println（“保存时的列表长度=“+this.list.getFirstText（））；
}捕获（FileNotFoundException e1）{
System.out.println（“未找到文件：“+filename”）；
e1.printStackTrace（）；
}捕获（IOE1异常）{
System.out.println（“IO异常：+e1”）；
e1.printStackTrace（）；
}
}
}
公共类DirectoryChooser扩展JPanel实现ActionListener{
私有静态最终长serialVersionUID=-8143869075088499054L；
私有JButton setwd；
私有字符串工作目录；
私有JFileChooser选择器；
私有字符串选择器标题；
private boolean directoryOnly=true；
@抑制警告（“隐藏”）
公共目录选择器（字符串选择器标题）{
this.choosertitle=choosertitle；
setwd=新的JButton（选择标题）；
setwd.addActionListener（这个）；
添加（setwd）；
workingdir=新文件（System.getProperty（“user.dir”））.toString（）；
}
@抑制警告（“隐藏”）
公共目录选择器（字符串选择器标题，仅布尔目录）{
此（选择标题）；
this.directoryOnly=directoryOnly；
}
已执行的公共无效操作（操作事件e）{
chooser=newjfilechooser（）；
chooser.setCurrentDirectory（新的java.io.File（“.”）；
选择器.setDialogTitle（选择器标题）；
如果（仅适用于目录）{
setFileSelectionMode（仅限于JFileChooser.DIRECTORIES_）；
}
选择器.setAcceptableFileFilterUsed（false）；
如果（chooser.showOpenDialog（this）=JFileChooser.APPROVE_选项）{
workingdir=chooser.getSelectedFile（）.toString（）；
}否则{
workingdir=chooser.getCurrentDirectory（）.toString（）；
}
}
公共字符串getResults
public class Entry extends JPanel implements Serializable{
private static final long serialVersionUID = 8748191176188997955L;
private JTextField textField;
private JButton plus;
private JButton minus;
private EntryList parent;
public Entry(String textFieldText, EntryList list) {
this.parent = list;
this.plus = new JButton(new AddEntryAction());
this.minus = new JButton(new RemoveEntryAction());
this.textField = new JTextField(10);
this.textField.setText(textFieldText);
add(this.plus);
add(this.minus);
add(this.textField);
}
public String getText() {
return this.textField.getText();
}
public class AddEntryAction extends AbstractAction {
private static final long serialVersionUID = -1936452299010320790L;
public AddEntryAction() {
super("+");
}
public void actionPerformed(ActionEvent e) {
parent.cloneEntry(Entry.this);
}
}
public class RemoveEntryAction extends AbstractAction {
private static final long serialVersionUID = 4843871176230776949L;
public RemoveEntryAction() {
super("-");
}
public void actionPerformed(ActionEvent e) {
parent.removeItem(Entry.this);
}
}
public void enableAdd(boolean enabled) {
this.plus.setEnabled(enabled);
}
public void enableMinus(boolean enabled) {
this.minus.setEnabled(enabled);
}
}
public class EntryList extends JPanel implements Serializable{
private static final long serialVersionUID = 1426379083556312697L;
private List<Entry> entries;
public EntryList() {
this.entries = new ArrayList<Entry>();
Entry initial = new Entry("debugtext", this);
addItem(initial);
}
public int getLength() {
return this.entries.size();
}
public String getFirstText() {
return this.entries.get(0).getText();
}
public void cloneEntry(Entry entry) {
Entry theClone = new Entry("", this);
addItem(theClone);
}
private void addItem(Entry entry) {
entries.add(entry);
add(entry);
refresh();
}
public void removeItem(Entry entry) {
entries.remove(entry);
remove(entry);
refresh();
}
private void refresh() {
revalidate();
if (entries.size() == 1) {
entries.get(0).enableMinus(false);
}
else {
for (Entry e : entries) {
e.enableMinus(true);
}
}
}
}
public class SaveListener extends DirectoryChooser implements ActionListener {
private static final long serialVersionUID = -8842006866700189526L;
private EntryList list;
private String filename;
public SaveListener(String choosertitle, ScrollBar bar) {
super(choosertitle, false);
this.list = bar.getEntryList();
}
@Override
public void actionPerformed(ActionEvent e) {
super.actionPerformed(e);
try {
filename = this.getResultsDirectory();
OutputStream os = new FileOutputStream(filename);
ObjectOutputStream oos = new ObjectOutputStream(os);
oos.writeObject(list);
oos.close();
System.out.println("Length of list at saving = " + this.list.getLength());
System.out.println("Length of list at saving = " + this.list.getFirstText());
} catch (FileNotFoundException e1) {
System.out.println("File not found: " + filename);
e1.printStackTrace();
} catch (IOException e1) {
System.out.println("IO Exception: " + e1);
e1.printStackTrace();
}
}
}
public class DirectoryChooser extends JPanel implements ActionListener {
private static final long serialVersionUID = -8143869075088499054L;
private JButton setwd;
private String workingdir;
private JFileChooser chooser;
private String choosertitle;
private boolean directoryOnly = true;
@SuppressWarnings("hiding")
public DirectoryChooser(String choosertitle) {
this.choosertitle = choosertitle;
setwd = new JButton(choosertitle);
setwd.addActionListener(this);
add(setwd);
workingdir = new File(System.getProperty("user.dir")).toString();
}
@SuppressWarnings("hiding")
public DirectoryChooser(String choosertitle, boolean directoryOnly) {
this(choosertitle);
this.directoryOnly = directoryOnly;
}
public void actionPerformed(ActionEvent e) {
chooser = new JFileChooser();
chooser.setCurrentDirectory(new java.io.File("."));
chooser.setDialogTitle(choosertitle);
if (directoryOnly) {
chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
}
chooser.setAcceptAllFileFilterUsed(false);
if (chooser.showOpenDialog(this) == JFileChooser.APPROVE_OPTION) {
workingdir = chooser.getSelectedFile().toString();
} else {
workingdir = chooser.getCurrentDirectory().toString();
}
}
public String getResultsDirectory() {
return workingdir;
}
public Dimension getPreferredSize(){
return new Dimension(200, 200);
}
}
public class SingleFileChooser extends JPanel implements ActionListener {
private static final long serialVersionUID = -9068219101747975546L;
private JButton loadFiles;
private JFileChooser chooser;
private String choosertitle;
private File file;
private String filePath;
private FileNameExtensionFilter filter;
@SuppressWarnings("hiding")
public SingleFileChooser(String choosertitle) {
this.choosertitle = choosertitle;
loadFiles = new JButton(choosertitle);
loadFiles.addActionListener(this);
add(loadFiles);
}
@SuppressWarnings("hiding")
public SingleFileChooser(String choosertitle, FileNameExtensionFilter filter) {
this(choosertitle);
this.filter = filter;
}
public void actionPerformed(ActionEvent e) {
chooser = new JFileChooser();
chooser.setMultiSelectionEnabled(false);
if (filter != null) {
chooser.setFileFilter(filter);
}
chooser.setDialogTitle(choosertitle);
chooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
int returnVal = chooser.showOpenDialog(null);
if(returnVal == JFileChooser.APPROVE_OPTION) {
file = chooser.getSelectedFile();
filePath = file.getAbsolutePath();
}
}
public File getFile() {
return file;
}
public String getFilePath(){
return filePath;
}
public Dimension getPreferredSize(){
return new Dimension(200, 200);
}
}
public class MainFrame extends JFrame {
private static final long serialVersionUID = 512941639567306317L;
EntryList panel = new EntryList();
ScrollBar scrollPanel = new ScrollBar(panel, this);
public MainFrame() throws HeadlessException {
this.getContentPane().add(scrollPanel);
this.setLayout(new BoxLayout(this.getContentPane(), BoxLayout.Y_AXIS));
}
}
public class GUImain {
public static void main(String[] args) {
MainFrame frame = new MainFrame();
frame.pack();
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null); // center the window
}
}
public void addItem(String text) {
Entry entry = new Entry(text, this);
entries.add(entry);
add(entry);
}
//get all stored Entry strings from file into a List (for example)
List<String>entriesText = getEntriesStringsFromFile();
EntryList eList = new EntryList(); //make a new EntryList
for (String text : entriesText){ //add all content to EntryList
eList.addItem(text);
}
public void cloneEntry(Entry entry) {
Entry theClone = new Entry(entry.getText(), this);
addItem(theClone);
}