returnbook.java~2~

用java写的一个图书馆管理系统,应该说功能相当全面.包含所有源代码,从数据库的建立到客户端.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.sql.*;

public class ReturnBook
    extends JFrame
    implements ActionListener {
  DataBaseManager db = new DataBaseManager();
  ResultSet rs;
  JPanel panel1, panel2;
  Container c;
  JLabel ReturnedBookStudentLabel, ReturnedBookNameLabel,
      ReturnedDateLabel, ReturnedCommentLabel;
  JTextField ReturnedBookStudentTextField,
      ReturnedDateTextField, ReturnedCommentTextField;
  JButton ClearBtn, YesBtn, CancelBtn;
  JComboBox BookNameComboBox = new JComboBox();
  public ReturnBook() {
    super("书籍还入");
    c = getContentPane();
    c.setLayout(new BorderLayout());
    ReturnedBookStudentLabel = new JLabel("还书者姓名", JLabel.CENTER);
    ReturnedBookNameLabel = new JLabel("书名", JLabel.CENTER);
    ReturnedDateLabel = new JLabel("日期", JLabel.CENTER);
    ReturnedCommentLabel = new JLabel("备注", JLabel.CENTER);
    ReturnedBookStudentTextField = new JTextField(15);
    ReturnedDateTextField = new JTextField(15);
    ReturnedCommentTextField = new JTextField(15);
    try {
      String s = "";
      String strSQL = "select bookName from bookBrowse where is_returned='否'";
      rs = db.getResult(strSQL);
      while (rs.next()) {
        BookNameComboBox.addItem(rs.getString(1));
      }
    }
    catch (SQLException sqle) {
      System.out.println(sqle.toString());
    }
    catch (Exception ex) {
      System.out.println(ex.toString());
    }
    panel1 = new JPanel();
    panel1.setLayout(new GridLayout(4, 2));
    panel1.add(ReturnedBookStudentLabel);
    panel1.add(ReturnedBookStudentTextField);
    panel1.add(ReturnedBookNameLabel);
    panel1.add(BookNameComboBox);
    panel1.add(ReturnedDateLabel);
    panel1.add(ReturnedDateTextField);
    panel1.add(ReturnedCommentLabel);
    panel1.add(ReturnedCommentTextField);
    c.add(panel1, BorderLayout.CENTER);
    panel2 = new JPanel();
    panel2.setLayout(new GridLayout(1, 3));
    ClearBtn = new JButton("清空");
    YesBtn = new JButton("确定");
    CancelBtn = new JButton("取消");
    ClearBtn.addActionListener(this);
    YesBtn.addActionListener(this);
    CancelBtn.addActionListener(this);
    panel2.add(ClearBtn);
    panel2.add(YesBtn);
    panel2.add(CancelBtn);
    c.add(panel2, BorderLayout.SOUTH);
  }

  public void actionPerformed(ActionEvent e) {
    if (e.getSource() == CancelBtn) {
      this.dispose();
    }
    else if (e.getSource() == ClearBtn) {
      ReturnedBookStudentTextField.setText("");
      ReturnedDateTextField.setText("");
      ReturnedCommentTextField.setText("");

    }
    else if (e.getSource() == YesBtn) {
      if (ReturnedBookStudentTextField.getText().trim().equals("")) {
        JOptionPane.showMessageDialog(null, "请输入还书者的姓名。。。");
      }
      else if (BookNameComboBox.getSelectedItem().equals("")) {
        JOptionPane.showMessageDialog(null, "图书馆没有出借过书！");
      }
      else {
        try {
          String strSQL = "update bookBrowse set returnDate=TO_DATE('" +
              ReturnedDateTextField.getText().trim() + "'),com='" +
              ReturnedCommentTextField.getText().trim() +
              "',is_returned='是' where studentName='" +
              ReturnedBookStudentTextField.getText().trim() + "'and bookName='" +
              BookNameComboBox.getSelectedItem() + "'";
          if (db.updateSql(strSQL)) {
            JOptionPane.showMessageDialog(null, "还书完成！");
            strSQL =
                "update books set borrowed_count=borrowed_count-1 where bookname='" +
                BookNameComboBox.getSelectedItem() + "'";
            db.updateSql(strSQL);
            db.closeConnection();
            this.dispose();
          }
          else {
            JOptionPane.showMessageDialog(null, "还书失败！");
            db.closeConnection();
            this.dispose();
          }
        }
        catch (Exception ex) {
          System.out.println(ex.toString());
        }
      }
    }
  }
}