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private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
Connection conn=DBUtil.getConnection();
Statement stmt=null;
try{
stmt=conn.createStatement();
String sql="select * from user";
ResultSet rs = stmt.executeQuery(sql);
while (rs.next()) {
if(jTextField1.getText().equals(rs.getString("username"))){
JOptionPane.showMessageDialog(null,"¸ÃÓû§ÃûÒѾ´æÔÚ£¬²»¿ÉÒÔʹÓá£");
}else if(jTextField1.getText().equals("")){
JOptionPane.showMessageDialog(null,"Óû§Ãû²»ÄÜΪ¿Õ£¬ÇëÖØÐÂÌîд£¡");
}else if(!jTextField1.getText().equals(rs.getString("username"))){
JOptionPane.showMessageDialog(null,"¸ÃÓû§Ãû²»´æÔÚ£¬¿ÉÒÔʹÓá£");
}
}
}catch(SQLException e){
e.printStackTrace();
}finally{
try{
stmt.close();
DBUtil.close(conn);
}catch(SQLException e){
e.printStackTrace();
}
}
}
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