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Thread: how to do validation using java swing?

  1. #1
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    Default how to do validation using java swing?

    Hi, This is the real code, database name is kics , table name is dateframe and fields are date, style, description, fabricgsm, agegroup, size, measurementsunits..

    Here i want to validate componentTextField, TFstyle, TFdescription, TFfabricGSM, TFagegroup, TFsize, TFmeasurements; if these fields are null or left blank and click the save button, i must get the message box as "XYZ(date,style....) field should be entered".

    public class dateFrame extends JFrame { 
     
    JTextField componentTextField = new JTextField(); 
    JTextField TFstyle; 
    JTextField TFdescription; 
    JTextField TFfabricGSM; 
    JTextField TFagegroup; 
    JTextField TFsize; 
    JTextField TFmeasurements; 
     
    public static void main(String[] args) { 
    dateFrame df = new dateFrame(); 
    } 
     
    public dateFrame() { 
    super("Date Frame"); 
    dateFramePanel dfp = new dateFramePanel(); 
    save s = new save(); 
    getContentPane().add(dfp, BorderLayout.PAGE_START); 
    getContentPane().add(s, BorderLayout.SOUTH); 
    pack(); 
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    setLocation(350, 250); 
    setResizable(false); 
    setVisible(true); 
    } 
     
    class dateFramePanel extends JPanel { 
     
    DateChooser dc = new DateChooser(); 
     
    public dateFramePanel() { 
    super(new GridLayout(0, 2)); 
    JLabel Ldate = new JLabel("Date"); 
    JLabel Lstyle = new JLabel("Style"); 
    JLabel Ldescription = new JLabel("Description"); 
    JLabel LfabricGSM = new JLabel("Fabric & GSM"); 
    JLabel Lagegroup = new JLabel("Age group"); 
    JLabel Lsize = new JLabel("Size"); 
    JLabel Lmeasurements = new JLabel("Measurement units (CM / INCH)"); 
     
    TFstyle = new JTextField(10); 
    TFdescription = new JTextField(10); 
    TFfabricGSM = new JTextField(10); 
    TFagegroup = new JTextField(10); 
    TFsize = new JTextField(10); 
    TFmeasurements = new JTextField(10); 
     
    add(Ldate); 
    add(dc); 
    add(Lstyle); 
    add(TFstyle); 
    add(Ldescription); 
    add(TFdescription); 
    add(LfabricGSM); 
    add(TFfabricGSM); 
    add(Lagegroup); 
    add(TFagegroup); 
    add(Lsize); 
    add(TFsize); 
    add(Lmeasurements); 
    add(TFmeasurements); 
     
    setPreferredSize(new Dimension(700, 200)); 
    } 
    } 
     
    class save extends JPanel { 
     
    public save() { 
    JButton save = new JButton("Save"); 
    add(save); 
    save.addActionListener(new JDBC()); 
    } 
    }

    class JDBC implements ActionListener { 
     
    public void actionPerformed(ActionEvent e) { 
    Connection con = null; 
    Statement stmt; 
    String loadDriver = "sun.jdbc.odbc.JdbcOdbcDriver"; 
    try { 
    Class.forName(loadDriver); 
    con = DriverManager.getConnection("jdbc:mysql://localhost:3306/kics", "root", ""); 
    stmt = con.createStatement(); 
    String exe = "insert into kics.dateframe(date,style,description,fabricgsm,agegroup,size,measurementsunits)values('" + componentTextField.getText() + "', 
     
    '"+ TFstyle.getText() + "','" + TFdescription.getText() + "','" + TFfabricGSM.getText() + "','" + TFagegroup.getText() + "','"+ TFsize.getText() + "', 
     
    '"+ TFmeasurements.getText() + "')"; 
     
    stmt.executeUpdate(exe); 
     
     
    } catch (Exception e1) { 
    System.out.println("Exception found"); 
    System.err.println(e1.getMessage()); 
    } finally { 
    try { 
    con.close(); 
    } catch (Exception e1) { 
    System.out.println("Exception found"); 
    System.err.print(e1.getMessage()); 
    } 
    } 
    } 
    }
    Last edited by Vignesh Karthick; January 24th, 2011 at 05:49 AM.


  2. #2
    Member DanBrown's Avatar
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    Default Re: how to do validation using java swing?

    import java.awt.BorderLayout;
    import java.awt.Container;
    import java.awt.Dimension;
    import java.awt.event.*;
    import javax.swing.*;
     
    public class ValidationDemo extends JFrame  implements ActionListener{
        JTextField tfName,tfCity;
        JButton btnSave;
     
        JPanel con;
     
    	public ValidationDemo(String name){
    	    super(name);
    		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    		setSize(400,400);
     
    		tfName = new JTextField(20);
    		tfCity = new JTextField(20);
    		btnSave = new JButton("Save");
    		btnSave.addActionListener(this);
     
    		con = new JPanel();
    		add(con);
    		con.add(tfName);
    		con.add(tfCity);
    		con.add(btnSave);
     
     
            setVisible(true);
    	}
     
    	public void actionPerformed(ActionEvent ae){
     
     
    		if(ae.getSource()==btnSave){
    			if(isBlank(tfName))
    				showMessage(tfName,"Please enter name");
    			else if(isBlank(tfCity))
    				showMessage(tfCity,"Please enter City");
     
                           //here you can add more else if conditions for other text fields.
     
    		}
    	}
     
    	public boolean isBlank(JTextField tf){
               //	this is to check if text field is blank
     
    			if(tf.getText().trim().equals("")){
    				return true;
    			}
    			return false;
    	}
     
    	//This function is to show error message and set focus to the box which is empty
     
    	public void showMessage(JTextField tf , String msg){
    			JOptionPane.showMessageDialog(null,msg);
    			tf.requestFocus();
    	}
     
        public static void main(String[] args) {
    		new ValidationDemo("Validation Demo");
        }
     
     
     
     
    }

    Please feel free to contact if any problem in understanding the code.
    Thanks and Regards
    Dan Brown

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