Java私活200元，完成JavaSwing学生成绩管理系统（三）

public class MainView extends JFrame {
    JPanel northPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
    JButton addBtn = new JButton("增加");
    JButton updateBtn = new JButton("修改");
    JButton delBtn = new JButton("删除");
    JTextField searchTxt = new JTextField(15);
    JButton searchBtn = new JButton("查询");
JPanel southPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
JButton preBtn = new JButton("上一页");
JButton nextBtn = new JButton("下一页");
MainViewTable mainViewTable = new MainViewTable();
private int pageNo = 1;
private int pageSize = 10;
MainViewHandler mainViewHandler;
public MainView() {
    super("主界面-Java学生成绩管理");
    Container contentPane = getContentPane();
    Rectangle bounds = DimensionUtil.getBounds();
    pageSize = Math.floorDiv(bounds.height, 35);
    mainViewHandler = new MainViewHandler(this);
    // 放置北边的组件
    layoutNorth(contentPane);
    // 设置中间的jtable
    layoutCenter(contentPane);
    // 放置南边的组件
    layoutSouth(contentPane);
    // 自定义图标
    URL imgUrl = MainView.class.getClassLoader().getResource("learnIcon.jpg");
    setIconImage(new ImageIcon(imgUrl).getImage());
    // 根据屏幕大小设置主界面大小
    setBounds(bounds);
    // 设置窗体完全充满整个屏幕的可见大小
    setExtendedState(JFrame.MAXIMIZED_BOTH);
    setLocationRelativeTo(null);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setResizable(true);
    setVisible(true);
}
private void layoutCenter(Container contentPane) {
    TableDTO dto = getTableDTO();
    MainViewTableModel mainViewTableModel = MainViewTableModel.assembleModel(dto.getData());
    // 把jtable和model关联
    mainViewTable.setModel(mainViewTableModel);
    mainViewTable.renderRule();
    JScrollPane jScrollPane = new JScrollPane(mainViewTable);
    contentPane.add(jScrollPane, BorderLayout.CENTER);
    showPreNext(dto.getTotalCount());
}
private TableDTO getTableDTO() {
    StudentService studentService = new StudentServiceImpl();
    StudentRequest request = new StudentRequest();
    request.setPageNo(pageNo);
    request.setPageSize(pageSize);
    request.setSearchKey(searchTxt.getText().trim());
    TableDTO tableDTO = studentService.retrieveStudents(request);
    return tableDTO;
}
private void layoutSouth(Container contentPane) {
    preBtn.addActionListener(mainViewHandler);
    nextBtn.addActionListener(mainViewHandler);
    southPanel.add(preBtn);
    southPanel.add(nextBtn);
    contentPane.add(southPanel, BorderLayout.SOUTH);
}
/*
设置上一页下一页是否可见
 */
private void showPreNext(int totalCount) {
    if (pageNo == 1) {
        preBtn.setVisible(false);
    } else {
        preBtn.setVisible(true);
    }
    int pageCount = 0;
    if (totalCount % pageSize == 0) {
        pageCount = totalCount / pageSize;
    } else {
        pageCount = totalCount / pageSize + 1;
    }
    if (pageNo > pageCount) {
        pageNo = pageCount;
    } else if (pageNo < 1) {
        pageNo = 1;
    }
    if (pageNo == pageCount) {
        nextBtn.setVisible(false);
    } else {
        nextBtn.setVisible(true);
    }
}
private void layoutNorth(Container contentPane) {
    // 增加事件监听
    addBtn.addActionListener(mainViewHandler);
    updateBtn.addActionListener(mainViewHandler);
    delBtn.addActionListener(mainViewHandler);
    searchBtn.addActionListener(mainViewHandler);
    northPanel.add(addBtn);
    northPanel.add(updateBtn);
    northPanel.add(delBtn);
    northPanel.add(searchTxt);
    northPanel.add(searchBtn);
    contentPane.add(northPanel, BorderLayout.NORTH);
}
public static void main(String[] args) {
    new MainView();
}
public void setPageNo(int pageNo) {
    this.pageNo = pageNo;
}
public int getPageNo() {
    return pageNo;
}
public void reloadTable() {
    TableDTO dto = getTableDTO();
    MainViewTableModel.updateModel(dto.getData());
    mainViewTable.renderRule();
    showPreNext(dto.getTotalCount());
}
public long[] getSelectedStudentIds() {
    int[] selectedRows = mainViewTable.getSelectedRows();
    long[] ids = new long[selectedRows.length];
    for (int i = 0; i < selectedRows.length; i++) {
        int rowIndex = selectedRows[i];
        Object idObj = mainViewTable.getValueAt(rowIndex, 0);
        ids[i] = Long.parseLong(idObj.toString());
    }
    return ids;
}
public MainViewTable getMainViewTable() {
    return mainViewTable;
}
  }