w.java

模拟实现数据库功能 添加删除查找功能

        		charname=table.getValueAt(i,j).toString();
        		bout.write(charname);
        		bout.write(" ");
        	}
        	bout.newLine();           
        }
        bout.close();
        out.close();
        }catch(NullPointerException e) { 
              i++;
              JOptionPane.showMessageDialog(table,"     第 "+i+" 行 有空值 !","非法操作",JOptionPane.ERROR_MESSAGE);
              return false;
              }
             return true;

       	}catch(IOException e){	System.err.println(e);}
       	return true;		
       	}
        public void actionPerformed(ActionEvent e){
        
        if(e.getSource()==b1){
				dt.addRow(data);
      		
        }
		if(e.getSource()==b2){
                if(selectedRow==-1) selectedRow++;
                   dt.insertRow(selectedRow,data);
        }
        if(e.getSource()==b3){
			final JFileChooser fa = new JFileChooser();
			fa.setLocation(500,450);
			fa.setDialogTitle("存表");
			int returnVal = fa.showSaveDialog(this);
			File file=fa.getSelectedFile();
			filename=file.getPath();
			savefile(filename);
			if(ss){
			setVisible(false);}
            
        }
        if(e.getSource()==b4)
        {
			if ( selectedRow == -1 ) 
      			selectedRow++;
      			dt.removeRow ( selectedRow ) ;     		
        }
		

        if(e.getSource()==b5)
        {
        	setVisible(false);
        }
   }
   
   class PopupListener extends MouseAdapter {
    public void mousePressed(MouseEvent e) {
        maybeShowPopup(e);
    }
    public void mouseReleased(MouseEvent e) {
        maybeShowPopup(e);
    }
    private void maybeShowPopup(MouseEvent e) {
        if (e.isPopupTrigger()) {
            popup.show(e.getComponent(),
                       e.getX(), e.getY());
        }
    }

}
}
////////////////////////////////////////////////////////////
////读数据类
class openfile extends JFrame implements ActionListener{
	JTable table;
	Object []dat;
	Object [][]p;
	String[] data;
	JButton b1,b2,b3,b4,b5;
	FileReader read;
	BufferedReader bout;
	JPanel p1,p2;
	int i=1,j=0,t=0;
	DefaultTableModel dt;
	String s1="";
	String a[];
	String fname=null;
	int selectedRow;
	LinkedList ls1;
	JPopupMenu popup;
	boolean aa=false;
	String filename=null;
	int lenght;
	
	openfile(String filename)
	{
		super("展示表格内容");
		fname=filename;
		p1=new JPanel();
		p2=new JPanel();
		b1=new JButton("返回");
		b1.addActionListener(this);
		b2=new JButton("添加");
		b2.addActionListener(this);
		b3=new JButton("插入");
		b3.addActionListener(this);
		b4=new JButton("删除");
		b4.addActionListener(this);
		b5=new JButton("保存");
		b5.addActionListener(this);

		

		try{
		read=new FileReader(filename);
		bout=new BufferedReader(read);
		while((s1=bout.readLine())!=null)
		{
			StringTokenizer fenxi=new StringTokenizer(s1," ");
			int n=fenxi.countTokens();
			a=new String[n];
			for(j=0;j<n;j++)
			{
				String temp=fenxi.nextToken();
				a[j]=temp;
				
			}
			if(i==1)
			{				
                dt=new DefaultTableModel(a,0);
                table = new JTable(dt);			       	
			}
			else
			{			
                dat=a;
				dt.insertRow(i-2,dat);
			}
			i++;
		}
		bout.close();
		read.close();
		}
      catch(IOException e)
         {
           System.out.println(e);
         } 
//		 
		 JScrollPane scrollPane = new JScrollPane(table);
         p1.add(scrollPane);
         p2.setLayout(new FlowLayout());
		 p2.add(b1);p2.add(b2);p2.add(b3);p2.add(b4);p2.add(b5);
		 getContentPane().setLayout(new BorderLayout());
		 getContentPane().add(p1,BorderLayout.CENTER);
		 getContentPane().add(p2,BorderLayout.SOUTH);
		 table.setPreferredScrollableViewportSize(new Dimension(370, 180));
		 setBounds(250,200,400,300);
         
         table.setSelectionMode ( ListSelectionModel.SINGLE_SELECTION );
         ListSelectionModel rowSM = table.getSelectionModel();
         rowSM.addListSelectionListener ( new ListSelectionListener() {
         public void valueChanged(ListSelectionEvent e) {
         if ( e.getValueIsAdjusting() ) return;
                    ListSelectionModel lsm = ( ListSelectionModel ) e.getSource();
                    selectedRow = lsm.getMinSelectionIndex();
                }
            });
//
        int i1 = 0,len1;
        String name1;
        ls1 = new LinkedList () ;
        int rowNum1 = table.getColumnCount();
        try{      	
        	for ( i1 = 0 ; i1 < rowNum1 ; i1++ )
				{       		
        		 name1 = table.getColumnName(i1) . toString () ;
                 ls1.addLast ( name1 ) ;
                
                }
                
             }
             catch ( NullPointerException e )
				{              
        		  i1++;
        		  JOptionPane.showMessageDialog
        		  ( create.c," 第 "+i1+" 行 有空值 !","ererr",
        		  JOptionPane.ERROR_MESSAGE ) ;
             	}  
		 }
  
     public boolean savefile(String filename)
       {
       	int i=0,j=0;
       	String s=null;
       
       	try{	
       	FileWriter out=new FileWriter(filename);
       	BufferedWriter bout=new BufferedWriter(out);
       	String charname;
       	int rowNum=table.getRowCount();
        try{
        	for(j=0;j<ls1.size();j++)
        	{
        		s=ls1.get(j).toString();
        		bout.write(s);
        		bout.write(" ");
        	}
            bout.newLine();	
            for(i=0;i<rowNum;i++){
        	for(j=0;j<ls1.size();j++)
        	{
        		charname=table.getValueAt(i,j).toString();
        		bout.write(charname);
        		bout.write(" ");
        	}
        	bout.newLine();           
        }
        bout.close();
        out.close();
        }catch(NullPointerException e) { 
              i++;
              JOptionPane.showMessageDialog(table,"     第 "+i+" 行 有空值 !","非法操作",JOptionPane.ERROR_MESSAGE);
              return false;
              }
             return true;

       	}catch(IOException e){	System.err.println(e);}
       	return true;		
       	}


	public void actionPerformed(ActionEvent e)
		{
		  if(e.getSource()==b1){setVisible(false);}
		  if(e.getSource()== b2){dt.addRow(data);}
		  if( e.getSource()== b3 ) 
			  {      	
      	        if ( selectedRow == -1 ) 
      		 	selectedRow++;
      			dt.insertRow ( selectedRow,data ) ;
      		  }
          if(e.getSource()== b4)
			 {        	
                if ( selectedRow == -1 ) 
      			selectedRow++;
      			dt.removeRow ( selectedRow ) ;       	
        	 }
        
      	  if( e.getSource()== b5 )
			 {
			  if(fname!=null)
			  savefile(fname);
			  if(aa)
			    {
			     setVisible(false);
			    }
		     }
          
       }
 class PopupListener extends MouseAdapter 
   {
    public void mousePressed(MouseEvent e) 
		{
          maybeShowPopup(e);
        }
    public void mouseReleased(MouseEvent e)
		{
          maybeShowPopup(e);
        }
    private void maybeShowPopup(MouseEvent e)
		{
          if(e.isPopupTrigger())
			  {
               popup.show(e.getComponent(),
               e.getX(), e.getY());
              }
        }

  }

}
class suoyin extends JFrame implements ActionListener
{   
	JTable table;
	JLabel l1;
    Object []data,data1[];
	Object [][]p;
	JButton b1,b2,b3;
	JTextField t1;
	TextArea ta;
	JPanel p1,p2,p3,p4;
	FileReader read;
	BufferedReader bout;
	int i=1,j=0,t=0,number=0,colnumber=-1;
	DefaultTableModel dt,dt1,sdt;
	String s="123456";
	String a[],b[];
	openfile file;

	public void actionPerformed(ActionEvent e)
	{
		if(e.getSource()==b1){}
		if(e.getSource()==b2){setVisible(false);}
	}


}
///////////////////////////////////////////////////////////////////////////
///获取内容
 class field implements Serializable{
       private String name;  //字段名字
       private String type;  //字段类型
       private int len;      //字段长度
       
    public field ( String name,String type,int len ) {
       this.name = name;
       this.type = type;
       this.len = len;
    }
    
    public String getName () {
       return name;
    }
    
    public String getType () {
       return type;
    }
    
    public int getLen () {
       return len;       
    }
}
class w
	{
		static JieMian fr;
		public static void main(String args[])
			{
             fr=new JieMian();
		    }

    }