如何解决java - 在问题类中使用datechooser时，如何使用java中的系统当前日期验证用户输入日期
package librarymanagementsystem;
import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
import com.toedter.calendar.JDateChooser;
import java.awt.event.*;
import java.sql.*;
import java.util.Date;
import java.time.LocalDate;
public class IssueBook extends JFrame implements ActionListener{
private JPanel contentPane;
JDateChooser dateChooser;
private JTextField t1,t2,t3,t4,t5,t6,t7,t8,t9,t10,t11,t12,t13,t14;
private JButton b1,b2,b3,b4;
public static void main(String[] args) {
new IssueBook().setVisible(true);
}
public IssueBook() {
setBounds(300,200,900,500);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5,5,5));
setContentPane(contentPane);
contentPane.setBackground(Color.WHITE);
contentPane.setLayout(null);
JLabel l1 = new JLabel("Book_id");
l1.setFont(new Font("Tahoma",Font.BOLD,14));
l1.setForeground(new Color(47,79,79));
l1.setBounds(47,63,100,23);
contentPane.add(l1);
JLabel l2 = new JLabel("Name");
l2.setForeground(new Color(47,79));
l2.setFont(new Font("Tahoma",14));
l2.setBounds(47,97,23);
contentPane.add(l2);
JLabel l3 = new JLabel("Author");
l3.setForeground(new Color(47,79));
l3.setFont(new Font("Tahoma",14));
l3.setBounds(47,131,23);
contentPane.add(l3);
JLabel l4 = new JLabel("Publisher");
l4.setForeground(new Color(47,79));
l4.setFont(new Font("Tahoma",14));
l4.setBounds(47,165,23);
contentPane.add(l4);
JLabel l5 = new JLabel("Edition");
l5.setForeground(new Color(47,79));
l5.setFont(new Font("Tahoma",14));
l5.setBounds(47,199,23);
contentPane.add(l5);
JLabel l6 = new JLabel("Price");
l6.setForeground(new Color(47,79));
l6.setFont(new Font("Tahoma",14));
l6.setBounds(47,233,23);
contentPane.add(l6);
JLabel l7 = new JLabel("Pages");
l7.setForeground(new Color(47,79));
l7.setFont(new Font("Tahoma",14));
l7.setBounds(47,267,23);
contentPane.add(l7);
t1 = new JTextField();
t1.setForeground(new Color(47,79));
t1.setFont(new Font("Trebuchet MS",14));
t1.setBounds(126,66,86,20);
contentPane.add(t1);
b1 = new JButton("Search");
b1.addActionListener(this);
b1.setBorder(new LineBorder(new Color(192,192,192),1,true));
b1.setBackground(Color.BLACK);
b1.setForeground(Color.WHITE);
b1.setFont(new Font("Trebuchet MS",14));
b1.setBounds(234,59,30);
contentPane.add(b1);
t2 = new JTextField();
t2.setEditable(false);
t2.setForeground(new Color(47,79));
t2.setFont(new Font("Trebuchet MS",14));
t2.setBounds(126,208,20);
contentPane.add(t2);
t2.setColumns(10);
t3 = new JTextField();
t3.setEditable(false);
t3.setForeground(new Color(47,79));
t3.setFont(new Font("Trebuchet MS",14));
t3.setColumns(10);
t3.setBounds(126,20);
contentPane.add(t3);
t4 = new JTextField();
t4.setEditable(false);
t4.setForeground(new Color(47,79));
t4.setFont(new Font("Trebuchet MS",14));
t4.setColumns(10);
t4.setBounds(126,168,20);
contentPane.add(t4);
t5 = new JTextField();
t5.setEditable(false);
t5.setForeground(new Color(47,79));
t5.setFont(new Font("Trebuchet MS",14));
t5.setColumns(10);
t5.setBounds(126,202,20);
contentPane.add(t5);
t6 = new JTextField();
t6.setEditable(false);
t6.setForeground(new Color(47,79));
t6.setFont(new Font("Trebuchet MS",14));
t6.setColumns(10);
t6.setBounds(126,236,20);
contentPane.add(t6);
t7 = new JTextField();
t7.setEditable(false);
t7.setForeground(new Color(47,79));
t7.setFont(new Font("Trebuchet MS",14));
t7.setColumns(10);
t7.setBounds(126,270,20);
contentPane.add(t7);
JPanel panel = new JPanel();
panel.setBorder(new TitledBorder(new LineBorder(new Color(47,79),2,true),"Issue-Book",TitledBorder.LEADING,TitledBorder.TOP,null,new Color(34,139,34)));
panel.setFont(new Font("Tahoma",14));
panel.setBounds(10,38,345,288);
panel.setBackground(Color.WHITE);
contentPane.add(panel);
JLabel l8 = new JLabel("Student_id");
l8.setForeground(new Color(47,79));
l8.setFont(new Font("Tahoma",14));
l8.setBounds(384,23);
contentPane.add(l8);
JLabel l9 = new JLabel("Name");
l9.setForeground(new Color(47,79));
l9.setFont(new Font("Tahoma",14));
l9.setBounds(384,103,23);
contentPane.add(l9);
JLabel l10 = new JLabel("Father's Name");
l10.setForeground(new Color(47,79));
l10.setFont(new Font("Tahoma",14));
l10.setBounds(384,147,23);
contentPane.add(l10);
JLabel l11 = new JLabel("Course");
l11.setForeground(new Color(47,79));
l11.setFont(new Font("Tahoma",14));
l11.setBounds(384,187,23);
contentPane.add(l11);
JLabel l12 = new JLabel("Branch");
l12.setForeground(new Color(47,79));
l12.setFont(new Font("Tahoma",14));
l12.setBounds(384,23);
contentPane.add(l12);
JLabel l13 = new JLabel("Year");
l13.setForeground(new Color(47,79));
l13.setFont(new Font("Tahoma",14));
l13.setBounds(384,284,23);
contentPane.add(l13);
JLabel l14 = new JLabel("Semester");
l14.setForeground(new Color(47,79));
l14.setFont(new Font("Tahoma",14));
l14.setBounds(384,336,23);
contentPane.add(l14);
t8 = new JTextField();
t8.setForeground(new Color(47,79));
t8.setFont(new Font("Trebuchet MS",14));
t8.setColumns(10);
t8.setBounds(508,20);
contentPane.add(t8);
b2 = new JButton("Search");
b2.addActionListener(this);
b2.setFont(new Font("Trebuchet MS",14));
b2.setBorder(new LineBorder(new Color(192,true));
b2.setBounds(604,30);
b2.setBackground(Color.BLACK);
b2.setForeground(Color.WHITE);
contentPane.add(b2);
t9 = new JTextField();
t9.setForeground(new Color(47,79));
t9.setFont(new Font("Trebuchet MS",14));
t9.setEditable(false);
t9.setColumns(10);
t9.setBounds(508,106,20);
contentPane.add(t9);
t10 = new JTextField();
t10.setForeground(new Color(47,79));
t10.setFont(new Font("Trebuchet MS",14));
t10.setEditable(false);
t10.setColumns(10);
t10.setBounds(508,150,20);
contentPane.add(t10);
t11 = new JTextField();
t11.setForeground(new Color(47,79));
t11.setFont(new Font("Trebuchet MS",14));
t11.setEditable(false);
t11.setColumns(10);
t11.setBounds(508,190,20);
contentPane.add(t11);
t12 = new JTextField();
t12.setForeground(new Color(47,79));
t12.setFont(new Font("Trebuchet MS",14));
t12.setEditable(false);
t12.setColumns(10);
t12.setBounds(508,20);
contentPane.add(t12);
t13 = new JTextField();
t13.setForeground(new Color(47,79));
t13.setFont(new Font("Trebuchet MS",14));
t13.setEditable(false);
t13.setColumns(10);
t13.setBounds(508,286,20);
contentPane.add(t13);
t14 = new JTextField();
t14.setForeground(new Color(47,79));
t14.setFont(new Font("Trebuchet MS",14));
t14.setEditable(false);
t14.setColumns(10);
t14.setBounds(508,338,20);
contentPane.add(t14);
JPanel panel_1 = new JPanel();
panel_1.setBorder(new TitledBorder(new LineBorder(new Color(70,130,180),"StudentDetails",new Color(100,149,237)));
panel_1.setForeground(new Color(0,0));
panel_1.setBounds(360,378,372);
panel_1.setBackground(Color.WHITE);
contentPane.add(panel_1);
JLabel l15 = new JLabel(" Date of Issue :");
l15.setForeground(new Color(105,105,105));
l15.setFont(new Font("Trebuchet MS",15));
l15.setBounds(20,340,118,26);
contentPane.add(l15);
dateChooser = new JDateChooser();
dateChooser.setBorder(new LineBorder(new Color(0,0),true));
dateChooser.setForeground(new Color(105,105));
dateChooser.setBounds(137,337,29);
contentPane.add(dateChooser);
b3 = new JButton("Issue");
b3.addActionListener(this);
b3.setFont(new Font("Trebuchet MS",14));
b3.setBorder(new LineBorder(new Color(192,true));
b3.setBounds(47,377,33);
b3.setBackground(Color.BLACK);
b3.setForeground(Color.WHITE);
contentPane.add(b3);
b4 = new JButton("Back");
b4.addActionListener(this);
b4.setFont(new Font("Trebuchet MS",14));
b4.setBorder(new LineBorder(new Color(192,true));
b4.setBounds(199,33);
b4.setBackground(Color.BLACK);
b4.setForeground(Color.WHITE);
contentPane.add(b4);
}
public void actionPerformed(ActionEvent ae){
try{
conn con = new conn();
if(ae.getSource() == b1){
String sql = "select * from book where book_id = ?";
PreparedStatement st = con.c.prepareStatement(sql);
st.setString(1,t1.getText());
ResultSet rs = st.executeQuery();
while (rs.next()) {
t2.setText(rs.getString("name"));
t3.setText(rs.getString("author"));
t4.setText(rs.getString("publisher"));
t5.setText(rs.getString("edition"));
t6.setText(rs.getString("price"));
t7.setText(rs.getString("pages"));
}
st.close();
rs.close();
}
if(ae.getSource() == b2){
String sql = "select * from student where student_id = ?";
PreparedStatement st = con.c.prepareStatement(sql);
st.setString(1,t8.getText());
ResultSet rs = st.executeQuery();
while (rs.next()) {
t9.setText(rs.getString("name"));
t10.setText(rs.getString("father"));
t11.setText(rs.getString("course"));
t12.setText(rs.getString("branch"));
t13.setText(rs.getString("year"));
t14.setText(rs.getString("semester"));
}
st.close();
rs.close();
}
if(ae.getSource() == b3){
try{
String sql = "insert into issuebook(book_id,student_id,bname,sname,course,branch,dateOfIssue) values(?,?,?)";
PreparedStatement st = con.c.prepareStatement(sql);
st.setString(1,t1.getText());
st.setString(2,t8.getText());
st.setString(3,t2.getText());
st.setString(4,t9.getText());
st.setString(5,t11.getText());
st.setString(6,t12.getText());
st.setString(7,((JTextField) dateChooser.getDateEditor().getUiComponent()).getText());
int i = st.executeUpdate();
if (i > 0)
JOptionPane.showMessageDialog(null,"Successfully Book Issued..!");
else
JOptionPane.showMessageDialog(null,"error");
}catch(Exception e){
e.printstacktrace();
}
}
if(ae.getSource() == b4){
this.setVisible(false);
new Home().setVisible(true);
}
con.c.close();
}catch(Exception e){
}
}
}
*这是出书的代码。我想用系统当前日期验证用户输入的发行书籍日期。 我要验证
st.setString(7,((JTextField) dateChooser.getDateEditor().getUiComponent()).getText());
我曾尝试使用诸如 Now() 之类的日期函数，但无法修复它。
我怎样才能得到结果？
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