Question

我是Java的新手，可能是一个新手问题。我试图从另一个调用jframe。在这种情况下，我登录时会有一个登录jframe，然后是一个我想要工作的管理员jframe。

登录名是：

    package masterdocument;

import java.sql.*;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import oracle.jdbc.OraclePreparedStatement;
import oracle.jdbc.OracleResultSet;
import java.lang.*;


public class Login extends javax.swing.JFrame {

Connection conn=null;
OraclePreparedStatement pst=null;
OracleResultSet rs=null;

/**
 * Creates new form Login
 */
public Login() {
    initComponents();
}
 ...
     private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    // TODO add your handling code here:

    conn = JavaConnectDB.ConnecrDB();
    try{
        String sql="select * from tutilizadores where username= ? and password= ?";
        PreparedStatement pst = conn.prepareStatement(sql);
        pst.setString(1, USERNAME.getText());
        pst.setString(2, PASSWORD.getText());
        rs=(OracleResultSet)pst.executeQuery();
        if (rs.next()){
        //JOptionPane.showMessageDialog(null, "O username e password estavam bem");
        //Fecha a janela
        //close();

        //nova janela-Tutilizadores
        Tutilizadores c = new Tutilizadores();
        c.setVisible(true);
        }
        else{
        JOptionPane.showMessageDialog(null, "Login Inválido");
        }

    } catch(Exception e){
                        JOptionPane.showMessageDialog(null,e);
    }

}

和Tutilizadores是：

    package masterdocument;

import java.awt.EventQueue;
import java.beans.Beans;
import java.util.ArrayList;

import java.util.List;
import javax.persistence.RollbackException;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Tutilizadores extends JPanel {

public Tutilizadores() {
    initComponents();
    if (!Beans.isDesignTime()) {
        entityManager.getTransaction().begin();
    }
}

/**
 * This method is called from within the constructor to initialize the form.
 * WARNING: Do NOT modify this code. The content of this method is always
 * regenerated by the Form Editor.
 */
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">                          
private void initComponents() {
    bindingGroup = new org.jdesktop.beansbinding.BindingGroup();

    entityManager = java.beans.Beans.isDesignTime() ? null : javax.persistence.Persistence.createEntityManagerFactory("jdbc:oracle:thin:@localhost:1521:db01PU").createEntityManager();
    query = java.beans.Beans.isDesignTime() ? null : entityManager.createQuery("SELECT t FROM Tutilizadores_1 t");
    list = java.beans.Beans.isDesignTime() ? java.util.Collections.emptyList() : org.jdesktop.observablecollections.ObservableCollections.observableList(query.getResultList());
    masterScrollPane = new javax.swing.JScrollPane();
    masterTable = new javax.swing.JTable();
    utilIdLabel = new javax.swing.JLabel();
    usernameLabel = new javax.swing.JLabel();
    passwordLabel = new javax.swing.JLabel();
    perfilLabel = new javax.swing.JLabel();
    utilIdField = new javax.swing.JTextField();
    usernameField = new javax.swing.JTextField();
    passwordField = new javax.swing.JTextField();
    perfilField = new javax.swing.JTextField();
    saveButton = new javax.swing.JButton();
    refreshButton = new javax.swing.JButton();
    newButton = new javax.swing.JButton();
    deleteButton = new javax.swing.JButton();

    FormListener formListener = new FormListener();

    org.jdesktop.swingbinding.JTableBinding jTableBinding = org.jdesktop.swingbinding.SwingBindings.createJTableBinding(org.jdesktop.beansbinding.AutoBinding.UpdateStrategy.READ_WRITE, list, masterTable);
    org.jdesktop.swingbinding.JTableBinding.ColumnBinding columnBinding = jTableBinding.addColumnBinding(org.jdesktop.beansbinding.ELProperty.create("${utilId}"));
    columnBinding.setColumnName("Util Id");
    columnBinding.setColumnClass(java.math.BigDecimal.class);
    columnBinding = jTableBinding.addColumnBinding(org.jdesktop.beansbinding.ELProperty.create("${username}"));
    columnBinding.setColumnName("Username");
    columnBinding.setColumnClass(String.class);
    columnBinding = jTableBinding.addColumnBinding(org.jdesktop.beansbinding.ELProperty.create("${password}"));
    columnBinding.setColumnName("Password");
    columnBinding.setColumnClass(String.class);
    columnBinding = jTableBinding.addColumnBinding(org.jdesktop.beansbinding.ELProperty.create("${perfil}"));
    columnBinding.setColumnName("Perfil");
    columnBinding.setColumnClass(java.math.BigInteger.class);
    bindingGroup.addBinding(jTableBinding);

    masterScrollPane.setViewportView(masterTable);

    utilIdLabel.setText("Util Id:");

    usernameLabel.setText("Username:");

    passwordLabel.setText("Password:");

    perfilLabel.setText("Perfil:");

    org.jdesktop.beansbinding.Binding binding = org.jdesktop.beansbinding.Bindings.createAutoBinding(org.jdesktop.beansbinding.AutoBinding.UpdateStrategy.READ_WRITE, masterTable, org.jdesktop.beansbinding.ELProperty.create("${selectedElement.utilId}"), utilIdField, org.jdesktop.beansbinding.BeanProperty.create("text"));
    binding.setSourceUnreadableValue("null");
    bindingGroup.addBinding(binding);
    binding = org.jdesktop.beansbinding.Bindings.createAutoBinding(org.jdesktop.beansbinding.AutoBinding.UpdateStrategy.READ, masterTable, org.jdesktop.beansbinding.ELProperty.create("${selectedElement != null}"), utilIdField, org.jdesktop.beansbinding.BeanProperty.create("enabled"));
    bindingGroup.addBinding(binding);

    binding = org.jdesktop.beansbinding.Bindings.createAutoBinding(org.jdesktop.beansbinding.AutoBinding.UpdateStrategy.READ_WRITE, masterTable, org.jdesktop.beansbinding.ELProperty.create("${selectedElement.username}"), usernameField, org.jdesktop.beansbinding.BeanProperty.create("text"));
    binding.setSourceUnreadableValue("null");
    bindingGroup.addBinding(binding);
    binding = org.jdesktop.beansbinding.Bindings.createAutoBinding(org.jdesktop.beansbinding.AutoBinding.UpdateStrategy.READ, masterTable, org.jdesktop.beansbinding.ELProperty.create("${selectedElement != null}"), usernameField, org.jdesktop.beansbinding.BeanProperty.create("enabled"));
    bindingGroup.addBinding(binding);

    binding = org.jdesktop.beansbinding.Bindings.createAutoBinding(org.jdesktop.beansbinding.AutoBinding.UpdateStrategy.READ_WRITE, masterTable, org.jdesktop.beansbinding.ELProperty.create("${selectedElement.password}"), passwordField, org.jdesktop.beansbinding.BeanProperty.create("text"));
    binding.setSourceUnreadableValue("null");
    bindingGroup.addBinding(binding);
    binding = org.jdesktop.beansbinding.Bindings.createAutoBinding(org.jdesktop.beansbinding.AutoBinding.UpdateStrategy.READ, masterTable, org.jdesktop.beansbinding.ELProperty.create("${selectedElement != null}"), passwordField, org.jdesktop.beansbinding.BeanProperty.create("enabled"));
    bindingGroup.addBinding(binding);

    binding = org.jdesktop.beansbinding.Bindings.createAutoBinding(org.jdesktop.beansbinding.AutoBinding.UpdateStrategy.READ_WRITE, masterTable, org.jdesktop.beansbinding.ELProperty.create("${selectedElement.perfil}"), perfilField, org.jdesktop.beansbinding.BeanProperty.create("text"));
    binding.setSourceUnreadableValue("null");
    bindingGroup.addBinding(binding);
    binding = org.jdesktop.beansbinding.Bindings.createAutoBinding(org.jdesktop.beansbinding.AutoBinding.UpdateStrategy.READ, masterTable, org.jdesktop.beansbinding.ELProperty.create("${selectedElement != null}"), perfilField, org.jdesktop.beansbinding.BeanProperty.create("enabled"));
    bindingGroup.addBinding(binding);

    saveButton.setText("Save");
    saveButton.addActionListener(formListener);

    refreshButton.setText("Refresh");
    refreshButton.addActionListener(formListener);

    newButton.setText("New");
    newButton.addActionListener(formListener);

    deleteButton.setText("Delete");

    binding = org.jdesktop.beansbinding.Bindings.createAutoBinding(org.jdesktop.beansbinding.AutoBinding.UpdateStrategy.READ, masterTable, org.jdesktop.beansbinding.ELProperty.create("${selectedElement != null}"), deleteButton, org.jdesktop.beansbinding.BeanProperty.create("enabled"));
    bindingGroup.addBinding(binding);

    deleteButton.addActionListener(formListener);

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
    this.setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
            .addComponent(newButton)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addComponent(deleteButton)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addComponent(refreshButton)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addComponent(saveButton)
            .addContainerGap())
        .addGroup(layout.createSequentialGroup()
            .addContainerGap()
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(utilIdLabel)
                .addComponent(usernameLabel)
                .addComponent(passwordLabel)
                .addComponent(perfilLabel))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(utilIdField, javax.swing.GroupLayout.DEFAULT_SIZE, 315, Short.MAX_VALUE)
                .addComponent(usernameField, javax.swing.GroupLayout.DEFAULT_SIZE, 315, Short.MAX_VALUE)
                .addComponent(passwordField, javax.swing.GroupLayout.DEFAULT_SIZE, 315, Short.MAX_VALUE)
                .addComponent(perfilField, javax.swing.GroupLayout.DEFAULT_SIZE, 315, Short.MAX_VALUE))
            .addContainerGap())
        .addGroup(layout.createSequentialGroup()
            .addContainerGap()
            .addComponent(masterScrollPane, javax.swing.GroupLayout.DEFAULT_SIZE, 380, Short.MAX_VALUE)
            .addContainerGap())
    );

    layout.linkSize(javax.swing.SwingConstants.HORIZONTAL, new java.awt.Component[] {deleteButton, newButton, refreshButton, saveButton});

    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addContainerGap()
            .addComponent(masterScrollPane, javax.swing.GroupLayout.DEFAULT_SIZE, 130, Short.MAX_VALUE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(utilIdLabel)
                .addComponent(utilIdField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(usernameLabel)
                .addComponent(usernameField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(passwordLabel)
                .addComponent(passwordField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(perfilLabel)
                .addComponent(perfilField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(saveButton)
                .addComponent(refreshButton)
                .addComponent(deleteButton)
                .addComponent(newButton))
            .addContainerGap())
    );

    bindingGroup.bind();
}

// Code for dispatching events from components to event handlers.

private class FormListener implements java.awt.event.ActionListener {
    FormListener() {}
    public void actionPerformed(java.awt.event.ActionEvent evt) {
        if (evt.getSource() == saveButton) {
            Tutilizadores.this.saveButtonActionPerformed(evt);
        }
        else if (evt.getSource() == refreshButton) {
            Tutilizadores.this.refreshButtonActionPerformed(evt);
        }
        else if (evt.getSource() == newButton) {
            Tutilizadores.this.newButtonActionPerformed(evt);
        }
        else if (evt.getSource() == deleteButton) {
            Tutilizadores.this.deleteButtonActionPerformed(evt);
        }
    }
}// </editor-fold>                        



@SuppressWarnings("unchecked")
private void refreshButtonActionPerformed(java.awt.event.ActionEvent evt) {                                              
    entityManager.getTransaction().rollback();
    entityManager.getTransaction().begin();
    java.util.Collection data = query.getResultList();
    for (Object entity : data) {
        entityManager.refresh(entity);
    }
    list.clear();
    list.addAll(data);
}                                             

private void deleteButtonActionPerformed(java.awt.event.ActionEvent evt) {                                             
    int[] selected = masterTable.getSelectedRows();
    List<masterdocument.Tutilizadores_1> toRemove = new ArrayList<masterdocument.Tutilizadores_1>(selected.length);
    for (int idx = 0; idx < selected.length; idx++) {
        masterdocument.Tutilizadores_1 t = list.get(masterTable.convertRowIndexToModel(selected[idx]));
        toRemove.add(t);
        entityManager.remove(t);
    }
    list.removeAll(toRemove);
}                                            

private void newButtonActionPerformed(java.awt.event.ActionEvent evt) {                                          
    masterdocument.Tutilizadores_1 t = new masterdocument.Tutilizadores_1();
    entityManager.persist(t);
    list.add(t);
    int row = list.size() - 1;
    masterTable.setRowSelectionInterval(row, row);
    masterTable.scrollRectToVisible(masterTable.getCellRect(row, 0, true));
}                                         

private void saveButtonActionPerformed(java.awt.event.ActionEvent evt) {                                           
    try {
        entityManager.getTransaction().commit();
        entityManager.getTransaction().begin();
    } catch (RollbackException rex) {
        rex.printStackTrace();
        entityManager.getTransaction().begin();
        List<masterdocument.Tutilizadores_1> merged = new ArrayList<masterdocument.Tutilizadores_1>(list.size());
        for (masterdocument.Tutilizadores_1 t : list) {
            merged.add(entityManager.merge(t));
        }
        list.clear();
        list.addAll(merged);
    }


}                                          



// Variables declaration - do not modify                     
private javax.swing.JButton deleteButton;
private javax.persistence.EntityManager entityManager;
private java.util.List<masterdocument.Tutilizadores_1> list;
private javax.swing.JScrollPane masterScrollPane;
private javax.swing.JTable masterTable;
private javax.swing.JButton newButton;
private javax.swing.JTextField passwordField;
private javax.swing.JLabel passwordLabel;
private javax.swing.JTextField perfilField;
private javax.swing.JLabel perfilLabel;
private javax.persistence.Query query;
private javax.swing.JButton refreshButton;
private javax.swing.JButton saveButton;
private javax.swing.JTextField usernameField;
private javax.swing.JLabel usernameLabel;
private javax.swing.JTextField utilIdField;
private javax.swing.JLabel utilIdLabel;
private org.jdesktop.beansbinding.BindingGroup bindingGroup;
// End of variables declaration                   





public static void main(String[] args) {
    /* Set the Nimbus look and feel */
    //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
    /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
     * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
     */
    try {
        for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
            if ("Nimbus".equals(info.getName())) {
                javax.swing.UIManager.setLookAndFeel(info.getClassName());
                break;
            }
        }
    } catch (ClassNotFoundException ex) {
        java.util.logging.Logger.getLogger(Tutilizadores.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
        java.util.logging.Logger.getLogger(Tutilizadores.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        java.util.logging.Logger.getLogger(Tutilizadores.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
        java.util.logging.Logger.getLogger(Tutilizadores.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    }
    //</editor-fold>

    /* Create and display the form */
     EventQueue.invokeLater(new Runnable() {
        public void run() {
            JFrame frame = new JFrame();
            frame.setContentPane(new Tutilizadores());
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.pack();
            frame.setVisible(true);
        }
    });

}

}

为什么这不起作用？提前谢谢!!

Answer 1

Tutilizadores不是框架/窗口，它是JPanel，它无法在屏幕上显示，而无需使用某种窗口容器来显示它

有关详细信息，请参阅Top level containers和How to make frames (main windows)。

现在已经说过了，你处于一个很好的位置，可以使用CardLayout，这可以让你改变你的观点＆＃34;登录＆＃34;查看你＆＃34; admin＆＃34;在同一个窗口中查看（尽管您可能需要重构登录窗口以使用JPanel而不是JFrame）

请查看How to Use CardLayout了解详情。

您可能还应该看一下提供另类灵魂的How to Make Dialogs

Answer 2

添加此类，它会将您的Tuttilizadores JPanel包装在JFrame中。因为你不能只是dipslay JPanel，它只能在某些表面上绘制，比如JFrame。

    import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.BorderLayout;


public class TuttilizadoresFrame extends JFrame {


    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    TuttilizadoresFrame window = new TuttilizadoresFrame();
                    window.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the application.
     */
    public TuttilizadoresFrame() {
        initialize();
    }

    /**
     * Initialize the contents of the frame.
     */
    private void initialize() {
        setBounds(100, 100, 450, 300);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        Tutilizadores tutilizadores = new Tutilizadores();
        getContentPane().add(tutilizadores, BorderLayout.CENTER);
    }

}

然后将Tuttilizadores的创建更改为TuttilizadoresFrame

将Login类中的行Tutilizadores c = new Tutilizadores();更改为：

TuttilizadoresFrame c = new TuttilizadoresFrame();

Jframe调用另一个jframe但没有任何反应

2 个答案: