我有一个功能在哪里我正在实现rmi服务器接口（SchoolInterfaceImpl）我想检查jtextfield（textField_6）是否为空，如果空加载Jdialog框（FindStudent）我是怎么做的
import java.rmi.RemoteException;
import java.sql.SQLException;
import java.util.Date;
public class SchoolInterfaceImpl implements SchoolInterface {
@Override
public void find(String str) throws RemoteException, SQLException {
// TODO Auto-generated method stub
}
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import java.awt.FlowLayout;
import java.awt.GridBagLayout;
import javax.swing.JLabel;
import java.awt.GridBagConstraints;
import java.awt.Insets;
import javax.swing.JTextField;
import javax.swing.JComboBox;
import com.toedter.calendar.JDateChooser;
import javax.swing.JButton;
import java.awt.Color;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class StudentProfile extends JFrame {
String noOfClasses;
private JPanel contentPane;
private JTextField textField;
private JLabel lblFatherguardianName;
private JTextField textField_1;
private JLabel lblGender;
private JComboBox comboBox;
private JLabel lblDateOfBirth;
private JDateChooser dateChooser;
private JLabel lblCurrentAddress;
private JLabel lblPermenantAddress;
private JLabel lblPhoneNo;
private JLabel lblMobileNo;
private JLabel lblClass;
private JTextField textField_2;
private JTextField textField_3;
private JTextField textField_4;
private JTextField textField_5;
private JComboBox comboBox_1;
private JLabel lblRegistrationNo;
private JTextField textField_6;
private JButton btnFind;
private JButton btnSave;
private JButton btnEdit;
private JButton btnDelete;
private JButton btnCancel;
private JLabel label;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
StudentProfile frame = new StudentProfile();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public StudentProfile() {
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
setTitle("Student Profile");
setBounds(100, 100, 525, 375);
setLocation(100, 200);
setResizable(false);
setAlwaysOnTop(true);
setVisible(true);
contentPane = new JPanel();
contentPane.setBackground(Color.WHITE);
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
GridBagLayout gbl_contentPane = new GridBagLayout();
gbl_contentPane.columnWidths = new int[]{0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
gbl_contentPane.rowHeights = new int[]{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
gbl_contentPane.columnWeights = new double[]{0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, Double.MIN_VALUE};
gbl_contentPane.rowWeights = new double[]{0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, Double.MIN_VALUE};
contentPane.setLayout(gbl_contentPane);
String str = "Female";
lblRegistrationNo = new JLabel("Registration No.");
GridBagConstraints gbc_lblRegistrationNo = new GridBagConstraints();
gbc_lblRegistrationNo.anchor = GridBagConstraints.WEST;
gbc_lblRegistrationNo.insets = new Insets(0, 0, 5, 5);
gbc_lblRegistrationNo.gridx = 1;
gbc_lblRegistrationNo.gridy = 2;
contentPane.add(lblRegistrationNo, gbc_lblRegistrationNo);
textField_6 = new JTextField();
GridBagConstraints gbc_textField_6 = new GridBagConstraints();
gbc_textField_6.fill = GridBagConstraints.HORIZONTAL;
gbc_textField_6.insets = new Insets(0, 0, 5, 5);
gbc_textField_6.gridx = 3;
gbc_textField_6.gridy = 2;
contentPane.add(textField_6, gbc_textField_6);
textField_6.setColumns(10);
btnFind = new JButton("Find");
btnFind.setBackground(Color.WHITE);
btnFind.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
FindStudent fs = new FindStudent();
fs.setModal(true);
fs.setVisible(true);
}
});
GridBagConstraints gbc_btnFind = new GridBagConstraints();
gbc_btnFind.anchor = GridBagConstraints.WEST;
gbc_btnFind.insets = new Insets(0, 0, 5, 5);
gbc_btnFind.gridx = 4;
gbc_btnFind.gridy = 2;
contentPane.add(btnFind, gbc_btnFind);
label = new JLabel("Picture");
GridBagConstraints gbc_label = new GridBagConstraints();
gbc_label.gridheight = 5;
gbc_label.gridwidth = 3;
gbc_label.insets = new Insets(0, 0, 5, 5);
gbc_label.gridx = 5;
gbc_label.gridy = 2;
contentPane.add(label, gbc_label);
JLabel lblStudentName = new JLabel("Student Name");
GridBagConstraints gbc_lblStudentName = new GridBagConstraints();
gbc_lblStudentName.anchor = GridBagConstraints.WEST;
gbc_lblStudentName.gridwidth = 2;
gbc_lblStudentName.insets = new Insets(0, 0, 5, 5);
gbc_lblStudentName.gridx = 1;
gbc_lblStudentName.gridy = 3;
contentPane.add(lblStudentName, gbc_lblStudentName);
textField = new JTextField();
GridBagConstraints gbc_textField = new GridBagConstraints();
gbc_textField.fill = GridBagConstraints.HORIZONTAL;
gbc_textField.insets = new Insets(0, 0, 5, 5);
gbc_textField.gridx = 3;
gbc_textField.gridy = 3;
contentPane.add(textField, gbc_textField);
textField.setColumns(20);
lblFatherguardianName = new JLabel("Father/Guardian Name");
GridBagConstraints gbc_lblFatherguardianName = new GridBagConstraints();
gbc_lblFatherguardianName.anchor = GridBagConstraints.WEST;
gbc_lblFatherguardianName.insets = new Insets(0, 0, 5, 5);
gbc_lblFatherguardianName.gridx = 1;
gbc_lblFatherguardianName.gridy = 4;
contentPane.add(lblFatherguardianName, gbc_lblFatherguardianName);
textField_1 = new JTextField();
GridBagConstraints gbc_textField_1 = new GridBagConstraints();
gbc_textField_1.fill = GridBagConstraints.HORIZONTAL;
gbc_textField_1.insets = new Insets(0, 0, 5, 5);
gbc_textField_1.gridx = 3;
gbc_textField_1.gridy = 4;
contentPane.add(textField_1, gbc_textField_1);
textField_1.setColumns(20);
lblGender = new JLabel("Gender");
GridBagConstraints gbc_lblGender = new GridBagConstraints();
gbc_lblGender.anchor = GridBagConstraints.WEST;
gbc_lblGender.insets = new Insets(0, 0, 5, 5);
gbc_lblGender.gridx = 1;
gbc_lblGender.gridy = 5;
contentPane.add(lblGender, gbc_lblGender);
comboBox = new JComboBox();
comboBox.setBackground(Color.WHITE);
GridBagConstraints gbc_comboBox = new GridBagConstraints();
gbc_comboBox.anchor = GridBagConstraints.WEST;
comboBox.setPrototypeDisplayValue(str);
comboBox.setMaximumRowCount(2);
gbc_comboBox.insets = new Insets(0, 0, 5, 5);
gbc_comboBox.gridx = 3;
gbc_comboBox.gridy = 5;
contentPane.add(comboBox, gbc_comboBox);
lblDateOfBirth = new JLabel("Date of Birth");
GridBagConstraints gbc_lblDateOfBirth = new GridBagConstraints();
gbc_lblDateOfBirth.anchor = GridBagConstraints.WEST;
gbc_lblDateOfBirth.insets = new Insets(0, 0, 5, 5);
gbc_lblDateOfBirth.gridx = 1;
gbc_lblDateOfBirth.gridy = 6;
contentPane.add(lblDateOfBirth, gbc_lblDateOfBirth);
dateChooser = new JDateChooser();
dateChooser.getCalendarButton().setBackground(Color.WHITE);
GridBagConstraints gbc_dateChooser = new GridBagConstraints();
gbc_dateChooser.fill = GridBagConstraints.HORIZONTAL;
gbc_dateChooser.anchor = GridBagConstraints.NORTH;
gbc_dateChooser.insets = new Insets(0, 0, 5, 5);
gbc_dateChooser.gridx = 3;
gbc_dateChooser.gridy = 6;
contentPane.add(dateChooser, gbc_dateChooser);
lblCurrentAddress = new JLabel("Current Address");
GridBagConstraints gbc_lblCurrentAddress = new GridBagConstraints();
gbc_lblCurrentAddress.anchor = GridBagConstraints.WEST;
gbc_lblCurrentAddress.insets = new Insets(0, 0, 5, 5);
gbc_lblCurrentAddress.gridx = 1;
gbc_lblCurrentAddress.gridy = 7;
contentPane.add(lblCurrentAddress, gbc_lblCurrentAddress);
String str1 = "Computer Sciences";
textField_2 = new JTextField();
GridBagConstraints gbc_textField_2 = new GridBagConstraints();
gbc_textField_2.fill = GridBagConstraints.HORIZONTAL;
gbc_textField_2.insets = new Insets(0, 0, 5, 5);
gbc_textField_2.gridx = 3;
gbc_textField_2.gridy = 7;
contentPane.add(textField_2, gbc_textField_2);
textField_2.setColumns(20);
lblPermenantAddress = new JLabel("Permenant Address");
GridBagConstraints gbc_lblPermenantAddress = new GridBagConstraints();
gbc_lblPermenantAddress.anchor = GridBagConstraints.WEST;
gbc_lblPermenantAddress.insets = new Insets(0, 0, 5, 5);
gbc_lblPermenantAddress.gridx = 1;
gbc_lblPermenantAddress.gridy = 8;
contentPane.add(lblPermenantAddress, gbc_lblPermenantAddress);
textField_3 = new JTextField();
GridBagConstraints gbc_textField_3 = new GridBagConstraints();
gbc_textField_3.fill = GridBagConstraints.HORIZONTAL;
gbc_textField_3.insets = new Insets(0, 0, 5, 5);
gbc_textField_3.gridx = 3;
gbc_textField_3.gridy = 8;
contentPane.add(textField_3, gbc_textField_3);
textField_3.setColumns(20);
lblPhoneNo = new JLabel("Phone No.");
GridBagConstraints gbc_lblPhoneNo = new GridBagConstraints();
gbc_lblPhoneNo.anchor = GridBagConstraints.WEST;
gbc_lblPhoneNo.insets = new Insets(0, 0, 5, 5);
gbc_lblPhoneNo.gridx = 1;
gbc_lblPhoneNo.gridy = 9;
contentPane.add(lblPhoneNo, gbc_lblPhoneNo);
textField_4 = new JTextField();
GridBagConstraints gbc_textField_4 = new GridBagConstraints();
gbc_textField_4.fill = GridBagConstraints.HORIZONTAL;
gbc_textField_4.insets = new Insets(0, 0, 5, 5);
gbc_textField_4.gridx = 3;
gbc_textField_4.gridy = 9;
contentPane.add(textField_4, gbc_textField_4);
textField_4.setColumns(20);
lblMobileNo = new JLabel("Mobile No.");
GridBagConstraints gbc_lblMobileNo = new GridBagConstraints();
gbc_lblMobileNo.anchor = GridBagConstraints.WEST;
gbc_lblMobileNo.insets = new Insets(0, 0, 5, 5);
gbc_lblMobileNo.gridx = 1;
gbc_lblMobileNo.gridy = 10;
contentPane.add(lblMobileNo, gbc_lblMobileNo);
textField_5 = new JTextField();
GridBagConstraints gbc_textField_5 = new GridBagConstraints();
gbc_textField_5.fill = GridBagConstraints.HORIZONTAL;
gbc_textField_5.insets = new Insets(0, 0, 5, 5);
gbc_textField_5.gridx = 3;
gbc_textField_5.gridy = 10;
contentPane.add(textField_5, gbc_textField_5);
textField_5.setColumns(20);
lblClass = new JLabel("Class");
GridBagConstraints gbc_lblClass = new GridBagConstraints();
gbc_lblClass.anchor = GridBagConstraints.WEST;
gbc_lblClass.insets = new Insets(0, 0, 5, 5);
gbc_lblClass.gridx = 1;
gbc_lblClass.gridy = 11;
contentPane.add(lblClass, gbc_lblClass);
comboBox_1 = new JComboBox();
comboBox_1.setBackground(Color.WHITE);
GridBagConstraints gbc_comboBox_1 = new GridBagConstraints();
comboBox_1.setPrototypeDisplayValue(str);
comboBox_1.setMaximumRowCount(10);
gbc_comboBox_1.anchor = GridBagConstraints.WEST;
gbc_comboBox_1.insets = new Insets(0, 0, 5, 5);
gbc_comboBox_1.gridx = 3;
gbc_comboBox_1.gridy = 11;
contentPane.add(comboBox_1, gbc_comboBox_1);
btnSave = new JButton("Save");
btnSave.setBackground(Color.WHITE);
GridBagConstraints gbc_btnSave = new GridBagConstraints();
gbc_btnSave.anchor = GridBagConstraints.EAST;
gbc_btnSave.insets = new Insets(0, 0, 5, 5);
gbc_btnSave.gridx = 3;
gbc_btnSave.gridy = 13;
contentPane.add(btnSave, gbc_btnSave);
btnEdit = new JButton("Edit");
btnEdit.setBackground(Color.WHITE);
GridBagConstraints gbc_btnEdit = new GridBagConstraints();
gbc_btnEdit.insets = new Insets(0, 0, 5, 5);
gbc_btnEdit.gridx = 4;
gbc_btnEdit.gridy = 13;
contentPane.add(btnEdit, gbc_btnEdit);
btnDelete = new JButton("Delete");
btnDelete.setBackground(Color.WHITE);
GridBagConstraints gbc_btnDelete = new GridBagConstraints();
gbc_btnDelete.insets = new Insets(0, 0, 5, 5);
gbc_btnDelete.gridx = 5;
gbc_btnDelete.gridy = 13;
contentPane.add(btnDelete, gbc_btnDelete);
btnCancel = new JButton("Cancel");
btnCancel.setBackground(Color.WHITE);
GridBagConstraints gbc_btnCancel = new GridBagConstraints();
gbc_btnCancel.insets = new Insets(0, 0, 5, 5);
gbc_btnCancel.gridx = 6;
gbc_btnCancel.gridy = 13;
contentPane.add(btnCancel, gbc_btnCancel);
}
}
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.FlowLayout;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.ListSelectionModel;
import javax.swing.border.EmptyBorder;
import javax.swing.table.DefaultTableModel;
import java.awt.GridBagLayout;
import javax.swing.JTextField;
import java.awt.GridBagConstraints;
import java.awt.Insets;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.swing.JTable;
import java.util.Vector;
import javax.swing.JLabel;
import java.awt.Color;
public class FindStudent extends JDialog {
private final JPanel contentPanel = new JPanel();
private JTextField textField;
private JTextField textField_1;
private JTable table;
Connection conn = null;
Statement stmt = null;
static Vector<Vector<String>> data = new Vector<Vector<String>>();
/**
* Launch the application.
*/
public static void main(String[] args) {
try {
FindStudent dialog = new FindStudent();
dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
dialog.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* Create the dialog.
*/
public FindStudent() {
Vector<Vector<String>> data = new Vector<Vector<String>>();
Vector<String> columnNames = new Vector<String>();
columnNames.add("RegNo");
columnNames.add("StudentName");
columnNames.add("FatherName");
columnNames.add("Class");
String query = "Select RegNo, StudentName, FatherName, Class from SchoolDB.dbo.StudentProfile";
try{
conn = DriverManager.getConnection("jdbc:sqlserver:" + "//" +
"localhost;1433" + "Database=SchooDB"+";integratedSecurity=true;");
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
stmt = conn.createStatement();
//data.clear();
ResultSet rs = stmt.executeQuery(query);
while (rs.next()) {
Vector<String> vstring = new Vector<String>();
vstring.add(rs.getString("RegNo"));
vstring.add(rs.getString("StudentName"));
vstring.add(rs.getString("FatherName"));
vstring.add(rs.getString("Class"));
data.add(vstring);
}
}
catch (Exception e){
e.printStackTrace();
}
/*catch (SQLException e) {
e.printStackTrace();
}*/
finally{
if (stmt != null) {
try {
stmt.close();
} catch (SQLException ex) {
ex.printStackTrace();
}
}
}
setBounds(100, 100, 430, 350);
this.setAlwaysOnTop(true);
getContentPane().setLayout(new BorderLayout());
contentPanel.setBackground(Color.WHITE);
contentPanel.setBorder(new EmptyBorder(5, 5, 5, 5));
getContentPane().add(contentPanel, BorderLayout.CENTER);
GridBagLayout gbl_contentPanel = new GridBagLayout();
gbl_contentPanel.columnWidths = new int[]{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
gbl_contentPanel.rowHeights = new int[]{0, 0, 35, 0};
gbl_contentPanel.columnWeights = new double[]{0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, Double.MIN_VALUE};
gbl_contentPanel.rowWeights = new double[]{0.0, 0.0, 0.0, Double.MIN_VALUE};
contentPanel.setLayout(gbl_contentPanel);
{
textField = new JTextField();
GridBagConstraints gbc_textField = new GridBagConstraints();
gbc_textField.anchor = GridBagConstraints.NORTH;
gbc_textField.fill = GridBagConstraints.HORIZONTAL;
gbc_textField.gridwidth = 25;
gbc_textField.insets = new Insets(0, 0, 10, 5);
gbc_textField.gridx = 1;
gbc_textField.gridy = 0;
contentPanel.add(textField, gbc_textField);
textField.setColumns(10);
}
{
textField_1 = new JTextField();
GridBagConstraints gbc_textField_1 = new GridBagConstraints();
gbc_textField_1.gridwidth = 25;
gbc_textField_1.insets = new Insets(0, 0, 10, 5);
gbc_textField_1.anchor = GridBagConstraints.NORTH;
gbc_textField_1.fill = GridBagConstraints.HORIZONTAL;
gbc_textField_1.gridx = 1;
gbc_textField_1.gridy = 1;
contentPanel.add(textField_1, gbc_textField_1);
textField_1.setColumns(10);
}
{
table = new JTable();
GridBagConstraints gbc_table = new GridBagConstraints();
gbc_table.insets = new Insets(0, 0, 0, 5);
gbc_table.anchor = GridBagConstraints.NORTH;
gbc_table.gridwidth = 3;
gbc_table.gridx = 1;
gbc_table.gridy = 2;
DefaultTableModel model = new DefaultTableModel(data, columnNames);
final JTable table = new JTable(model){/**
*
*/
// private static final long serialVersionUID = 1L;
public boolean isCellEditable(int row, int column) {
return false;
};
};
table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
table.setPreferredScrollableViewportSize(new Dimension(425, 200));
table.setFillsViewportHeight(true);
table.getColumnModel().getColumn(0).setPreferredWidth(90);
table.getColumnModel().getColumn(1).setPreferredWidth(120);
table.getColumnModel().getColumn(2).setPreferredWidth(120);
table.getColumnModel().getColumn(3).setPreferredWidth(40);
JScrollPane jsp = new JScrollPane(table);
GridBagConstraints jsp_scroll = new GridBagConstraints();
jsp_scroll.insets = new Insets(0, 0, 0, 5);
jsp_scroll.fill = GridBagConstraints.BOTH;
jsp_scroll.gridwidth = 25;
jsp_scroll.gridx = 1;
jsp_scroll.gridy = 3;
contentPanel.add(jsp, jsp_scroll);
}
{
JPanel buttonPane = new JPanel();
buttonPane.setBackground(Color.WHITE);
buttonPane.setLayout(new FlowLayout(FlowLayout.RIGHT));
getContentPane().add(buttonPane, BorderLayout.SOUTH);
{
JButton okButton = new JButton("OK");
okButton.setBackground(Color.WHITE);
okButton.setActionCommand("OK");
buttonPane.add(okButton);
getRootPane().setDefaultButton(okButton);
}
{
JButton cancelButton = new JButton("Cancel");
cancelButton.setBackground(Color.WHITE);
cancelButton.setActionCommand("Cancel");
buttonPane.add(cancelButton);
}
}
}
}
答案 0 :(得分：0)
我想，如果点击＆＃34;查找＆＃34; 按钮，而不是检查SchoolInterfaceImpl中 textField_6 的空白，则需要执行此操作：
btnFind.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String strTextField_6 = textField_6.getText();
if ("".equals(strTextField_6)) {
FindStudent fs = new FindStudent();
fs.setModal(true);
fs.setVisible(true);
}
SchoolInterfaceImpl sii = new SchoolInterfaceImpl();
sii.find(strTextField_6);
}
});
答案 1 :(得分：0)
我不确定你的意思是因为我现在不在家，但你可以试试这个：
if (textField_6.getText().equals("")) {
Jdialog findStudent = new Jdialog(with the arguments needed);
findStudent.setVisible(true);
}