急！！ （在线等） 我做了一个文件模拟 但是创建目录时总出错 高手帮忙看看那
我做了一个文件模拟 但是创建目录时总出错 高手帮忙看看那运行后右键单击 “ROOTES”，创建目录时总会报以下错误错
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at file.FileGraphicsUserIndex$1.actionPerformed(FileGraphicsUserIndex.java:90)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.AbstractButton.doClick(AbstractButton.java:357)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1216)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1257)
at java.(Component.java:6038)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
at java.(Component.java:5803)
at java.awt.Container.processEvent(Container.java:2058)
at java.(Component.java:4410)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.(Component.java:4240)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3986)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)
at java.awt.Container.dispatchEventImpl(Container.java:2102)
at java.awt.Window.dispatchEventImpl(Window.java:2429)
at java.(Component.java:4240)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
代码如下：
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
//import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import
import
import
import
import
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
public class FileGraphicsUserIndex extends JPanel {
/**
*
*/
private static final long serialVersionUID = -4696988113883085233L;
private VirtualDisk disk;
private JTextField field;
private JTree fileTree;
public FileGraphicsUserIndex(){
setBorder(BorderFactory.createTitledBorder(
BorderFactory.createEtchedBorder(),"文件管理"));
setLayout(new BorderLayout());
VirtualDisk disk=getVirtualDiskFromTxt();
add(disk,BorderLayout.SOUTH);
//用户接口
JPanel commandPanel=new JPanel();
JLabel label=new JLabel("用户命令接口：");
commandPanel.add(label);
//label.setFont(new Font("宋体",Font.ITALIC,12));
commandPanel.add(field=new JTextField(12));
//field.setBackground(new Color(0x6699ff));
field.setForeground(Color.white);
add(commandPanel,BorderLayout.NORTH);
//目录树
fileTree=disk.getFileDirectoryTree();
//fileTree.setBackground(new Color(0x6699ff));
fileTree.setComponentPopupMenu(getPopupMenu());
JScrollPane treePane=new JScrollPane(fileTree);
add(treePane,BorderLayout.CENTER);
treePane.setPreferredSize(new Dimension(60,0));
treePane.setBorder(BorderFactory.createTitledBorder("文件系统"));
}
private VirtualDisk getVirtualDiskFromTxt(){
//return new VirtualDisk();
ObjectInputStream in;
try {
in = new ObjectInputStream(
new FileInputStream(new File("src/disk.txt")));
Object object=in.readObject();
disk=(VirtualDisk)object;
return disk;
} catch (FileNotFoundException e){
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
return null;
}
private JPopupMenu getPopupMenu(){
JPopupMenu menu=new JPopupMenu();
JMenu newMenu=new JMenu("新建");
menu.add(newMenu);
JMenuItem newDirectory=new JMenuItem("目录文件");
newDirectory.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent event){
DefaultMutableTreeNode parent=(DefaultMutableTreeNode)
fileTree.getSelectionPath().getLastPathComponent();
VirtualFile parentFile=(VirtualFile)parent.getUserObject();
//加一个输入文件名的对话框
String childFileName=JOptionPane.showInputDialog( "Please enter the file name:\n"+
"注意:文件名长度不大于6");
//String childFileName=getUsableFileName(parent);
VirtualFile childFile=new VirtualFile(childFileName,VirtualFile.EXTENSION_FILE);
DefaultMutableTreeNode child=new DefaultMutableTreeNode(childFile);
disk.createFile(parentFile, childFile);
disk.getTreeModel().insertNodeInto(child, parent,parent.getChildCount());
}
});
newMenu.add(newDirectory);
JMenuItem newCharFile=new JMenuItem("字符文件");
newCharFile.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent event){
DefaultMutableTreeNode parent=(DefaultMutableTreeNode)
fileTree.getSelectionPath().getLastPathComponent();
VirtualFile parentFile=(VirtualFile)parent.getUserObject();
String childFileName=JOptionPane.showInputDialog( "Please enter the file name:\n"+
"注意:文件名长度不大于6");
VirtualFile childFile=new VirtualFile(childFileName,VirtualFile.EXTENSION_CHAR_FILE);
DefaultMutableTreeNode child=new DefaultMutableTreeNode(childFile);
disk.createFile(parentFile, childFile);
disk.getTreeModel().insertNodeInto(child, parent,parent.getChildCount());
}
});
newMenu.add(newCharFile);
JMenuItem newExeFile=new JMenuItem("可执行文件");
newExeFile.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent event){
DefaultMutableTreeNode parent=(DefaultMutableTreeNode)
fileTree.getSelectionPath().getLastPathComponent();
VirtualFile parentFile=(VirtualFile)parent.getUserObject();
String childFileName=JOptionPane.showInputDialog( "Please enter the file name:\n"+
"注意:文件名长度不大于6");
//String childFileName=getUsableFileName(parent);
VirtualFile childFile=new VirtualFile(childFileName,VirtualFile.EXTENSION_EXECUTE_FILE);
DefaultMutableTreeNode child=new DefaultMutableTreeNode(childFile);
disk.createFile(parentFile, childFile);
disk.getTreeModel().insertNodeInto(child, parent,parent.getChildCount());
}
});
newMenu.add(newExeFile);
JMenuItem del=new JMenuItem("删除");
del.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent event){
DefaultMutableTreeNode choseNode=(DefaultMutableTreeNode)
fileTree.getSelectionPath().getLastPathComponent();
DefaultMutableTreeNode parent=(DefaultMutableTreeNode)
fileTree.getSelectionPath().getParentPath().getLastPathComponent();
disk.deleteFile(parent,choseNode);
}
});
menu.add(del);
JMenuItem edit=new JMenuItem("编辑");
edit.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent event){
DefaultMutableTreeNode choseNode=(DefaultMutableTreeNode)
fileTree.getSelectionPath().getLastPathComponent();
new EditFileDialogFrame(choseNode);
}
});
menu.add(edit);
///////////////////////////////////////////////////////////////////////////////////////////
/* JMenuItem copy=new JMenuItem("复制");
copy.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
// TODO Auto-generated method stub
//disk.format();
}
});
menu.add(copy);
*/
///////////////////////////////////////////////////////////////////////////////////////
JMenuItem execute=new JMenuItem("执行");
execute.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent event){
DefaultMutableTreeNode choseNode=(DefaultMutableTreeNode)
fileTree.getSelectionPath().getLastPathComponent();
VirtualFile file=(VirtualFile)choseNode.getUserObject();
String name=file.getFileName();
//name=name+"@"+(int)(Math.random()*1000);
String s=file.getFileContent();
// String program="";
// for(int i=0;i<s.length();i++){
// if((i+2)%5==0)i++;
// else program=program+String.valueOf(s.charAt(i));
// }
System.out.println(s);
try{//开始执行
//CourseControl.create(s);
//添加代码
}catch(Exception e){
String message="创建进程失败原因可能是\n因为申请不到PCB或内存！";
JOptionPane.showMessageDialog(null,message);
}
}
});
menu.add(execute);
JMenuItem newFormat=new JMenuItem("格式化");
newFormat.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
// TODO Auto-generated method stub
//disk.format();
}
});
menu.add(newFormat);
return menu;
}
public String getUsableFileName(DefaultMutableTreeNode parent){
String[] name=new String[100];
for(int i=0;i<100;i++){
if(i<10)name[i]="NFile"+i;
else name[i]="File"+i;
}
int count=parent.getChildCount();
boolean flag=false;
for(int j=0;j<100;j++){
for(int i=0;i<count;i++){
DefaultMutableTreeNode child=(DefaultMutableTreeNode)parent.getChildAt(i);
VirtualFile file=(VirtualFile)child.getUserObject();
if(file.getFileName().equals(name[j])){
flag=true;
break;
}
}
if(flag==false)
return name[j];
else flag=false;
}
return null;
}
private class EditFileDialogFrame extends JFrame{
private static final long serialVersionUID = 1L;
private JTextField name,extension;
private JButton cancel,record;
private JTextArea txt;
public EditFileDialogFrame(DefaultMutableTreeNode choseNode){
final VirtualFile file=(VirtualFile)choseNode.getUserObject();
setTitle("编辑文件界面");
setBounds(100,100,300,350);
JPanel nPanel=new JPanel();
nPanel.setBorder(BorderFactory.createEtchedBorder());
add(nPanel,BorderLayout.NORTH);
nPanel.add(new JLabel("文件名"));
nPanel.add(name=new JTextField(5));
name.setText(file.getFileName());
nPanel.add(new JLabel("扩展名"));
nPanel.add(extension=new JTextField(5));
extension.setText(file.getFileExtension());
extension.setEditable(false);
JPanel cPanel=new JPanel();
add(cPanel,BorderLayout.CENTER);
cPanel.add(new JScrollPane(txt=new JTextArea(10,20)));
txt.setText(file.getFileContent());
cPanel.setBorder(BorderFactory.createEtchedBorder());
JPanel sPanel=new JPanel();
sPanel.setBorder(BorderFactory.createEtchedBorder());
add(sPanel,BorderLayout.SOUTH);
sPanel.add(cancel=new JButton("取消"));
cancel.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent event){
setVisible(false);
}
});
sPanel.add(record=new JButton("保存"));
record.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent event){
file.setContent(txt.getText());
file.setFileName(name.getText());
file.setFileLength(txt.getText().length()+8);
disk.changeFileContent(file, txt.getText(), name.getText());
setVisible(false);
}
});
setVisible(true);
}
}
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
JFrame frame=new JFrame();
frame.add(new FileGraphicsUserIndex());
frame.setSize(300,500);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
