Java任务:图书信息检索
来自CloudWiki
任务描述
任务描述:图书信息检索
实现商品信息检索,如图9-1所示。
图 1商品信息检索
任务实现
实施思路
第一步:启动Eclipse,导入Java Project,工程名为Project0901。
第二步:完善商品信息检索界面。
1. 在BookListForm类上单击右键,选择 Open With WindowBuilder Editor,如图2所示
在类编写窗口的底部选择【Design】标签。
2.按照下图,把对应控件拖入窗体到指定位置,完成商品检索区域的构建,并设置各个控件的【Variable】属性:
3.设置分类下拉框:
- 选中分类组合框,在左侧的Properties窗口中找到Model这栏,如图:
- 点击上图的“…”添加如下图所示的三个分类:
4. 按照下图,完成商品显示区域的构建:
java9-8.png 图 1-8
- 把JScrollPane拖到界面中,并拉伸成上图大小。
- 把商品列表JTable嵌到JScrollPane:必须要把JTable控件拖入JScrollPane的Viewport区域中才能显示,拖入的区域如下图中的黄色区域所示:
- 设置表头标题:
点击左侧控件列表中的JTable控件。
java9-10.png 图 1-10
在属性列表中找到【model】,点击【…】打开表格编辑框:
点击【Columns】区域的【Insert】插入一列, 在底部的列属性区域中设置【Title】为:书籍分类,设置列宽【Pref.width】为:164
按照以上步骤,依次添加如下表头信息:
列名:库存,列宽:70 列名:书籍作者,列宽:70 列名:书籍名称,列宽:150 列名:书籍编号,列宽:70
5. 按照下图,完成商品购买区域的构建:
图 9 商品购买区域
第三步:定义显示书籍数据的函数:
private void showBooks(String name,int category) { BookDao dao=new BookDaoTesting(); List<Book> books=dao.queryBook(name, category); //在表格中显示数据 DefaultTableModel dt=(DefaultTableModel) tblBook.getModel(); dt.setRowCount(0); //判断是否查询到了满足条件的书籍信息 if(books==null||books.size()==0) { JOptionPane.showMessageDialog(frame, "没有满足条件的书籍信息","警告信息",JOptionPane.WARNING_MESSAGE); return; } for(int i=0;i<books.size();i++) { Book book=books.get(i); dt.insertRow(i, new Object[] { book.getBid(),book.getName(),book.getAuthor(),book.getNumber(), book.getCategory().toString() }); } } 第四步:为查询按钮添加事件处理程序 btnQuery.addActionListener(e->{ String name=txtBookName.getText(); int category=cboCategory.getSelectedIndex(); //显示书籍 showBooks(name,category); });
第五步:设置初始化窗口时,加载所有数据
showBooks(null,0);
程序代码
public class BookListForm { private JFrame frame; private JLabel lblName; private JLabel lblCity; private JTextField txtBookName; private JLabel lblCategory; private JTable tblBook; public JFrame getFrame() { return frame; } /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { BookListForm window = new BookListForm(); window.frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the application. */ public BookListForm() { initialize(); setCenter(frame); } private void showBooks(String name,int category) { BookDao dao=new BookDaoTesting(); List<Book> books=dao.queryBook(name, category); //在表格中显示数据 DefaultTableModel dt=(DefaultTableModel) tblBook.getModel(); dt.setRowCount(0); //判断是否查询到了满足条件的书籍信息 if(books==null||books.size()==0) { JOptionPane.showMessageDialog(frame, "没有满足条件的书籍信息","警告信息",JOptionPane.WARNING_MESSAGE); return; } for(int i=0;i<books.size();i++) { Book book=books.get(i); dt.insertRow(i, new Object[] { book.getBid(),book.getName(),book.getAuthor(),book.getNumber(), book.getCategory().toString() }); } } /** * Initialize the contents of the frame. */ private void initialize() { frame = new JFrame(); frame.setResizable(false); frame.getContentPane().setLayout(null); frame.setTitle("\u7535\u5546\u8D2D\u7269\u5E73\u53F0-\u5546\u54C1\u67E5\u8BE2\u9875\u9762"); frame.setBounds(100, 100, 550, 450); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JLabel lblWelcome = new JLabel("您好,"); lblWelcome.setFont(new Font("微软雅黑", Font.PLAIN, 14)); lblWelcome.setBounds(10, 10, 42, 15); frame.getContentPane().add(lblWelcome); lblName = new JLabel(""); lblName.setFont(new Font("微软雅黑", Font.PLAIN, 14)); lblName.setBounds(55, 10, 91, 15); frame.getContentPane().add(lblName); lblCity = new JLabel("来自于:"); lblCity.setFont(new Font("微软雅黑", Font.PLAIN, 14)); lblCity.setBounds(434, 10, 100, 15); frame.getContentPane().add(lblCity); JSeparator separator = new JSeparator(); separator.setBounds(10, 35, 524, 2); frame.getContentPane().add(separator); JLabel lblBookName = new JLabel("书籍名:"); lblBookName.setBounds(10, 47, 54, 21); frame.getContentPane().add(lblBookName); txtBookName = new JTextField(); txtBookName.setBounds(65, 47, 133, 21); frame.getContentPane().add(txtBookName); txtBookName.setColumns(20); lblCategory = new JLabel("分类:"); lblCategory.setBounds(226, 47, 66, 21); frame.getContentPane().add(lblCategory); JComboBox cboCategory = new JComboBox(); cboCategory.setModel(new DefaultComboBoxModel(new String[] {"-请选择-", "工具类>软件编程", "小说类>历史"})); cboCategory.setBounds(260, 47, 147, 21); frame.getContentPane().add(cboCategory); JButton btnQuery = new JButton("查询"); btnQuery.setBounds(441, 46, 78, 23); frame.getContentPane().add(btnQuery); btnQuery.addActionListener(e->{ String name=txtBookName.getText(); int category=cboCategory.getSelectedIndex(); //显示书籍 showBooks(name,category); }); JScrollPane scrollPane = new JScrollPane(); scrollPane.setBounds(10, 89, 524, 266); frame.getContentPane().add(scrollPane); tblBook = new JTable(); tblBook.setModel(new DefaultTableModel( new Object[][] { }, new String[] { "\u4E66\u7C4D\u7F16\u53F7", "\u4E66\u7C4D\u540D\u79F0", "\u4E66\u7C4D\u4F5C\u8005", "\u5E93\u5B58", "\u4E66\u7C4D\u5206\u7C7B" } )); tblBook.getColumnModel().getColumn(0).setPreferredWidth(70); tblBook.getColumnModel().getColumn(1).setPreferredWidth(150); tblBook.getColumnModel().getColumn(2).setPreferredWidth(70); tblBook.getColumnModel().getColumn(3).setPreferredWidth(70); tblBook.getColumnModel().getColumn(4).setPreferredWidth(164); scrollPane.setViewportView(tblBook); //初始化显示所有书籍 showBooks(null,0); JLabel lblCart = new JLabel("购物车商品数:"); lblCart.setBounds(10, 379, 91, 15); frame.getContentPane().add(lblCart); JLabel lblQuantity = new JLabel("0件"); lblQuantity.setBounds(104, 379, 54, 15); frame.getContentPane().add(lblQuantity); JLabel lblCartDetail = new JLabel("查看详情"); lblCartDetail.setForeground(Color.BLUE); lblCartDetail.setBounds(179, 379, 54, 15); frame.getContentPane().add(lblCartDetail); JButton btnBuy = new JButton("购买"); btnBuy.setBounds(441, 375, 78, 23); frame.getContentPane().add(btnBuy); } /** * 窗体自动居中 * * @param window */ private void setCenter(JFrame window) { Dimension d = Toolkit.getDefaultToolkit().getScreenSize(); int width = window.getWidth(); int height = window.getHeight(); window.setBounds((d.width - width) / 2, (d.height - height) / 2, width, height); } }