java復習實驗28實驗報告

1、 中北大學軟件學院 實 驗 報 告 專 業(yè) 軟件工程 課程名稱 JAVA面對對象程序設計 學 號 1414011529 姓 名 劉宇 輔導教師 薛海麗 成績 實驗日期實驗時間1實驗名稱 學生成績管理系統(tǒng)實驗目的(1)、掌握面向對象程序開發(fā)思想。(2)、掌握使用圖形用戶界面對文件進行訪問的程序開發(fā)機制。實驗內(nèi)容用面向對象程序設計思想完善之前的學生成績管理系統(tǒng)，將之前學生成績管理系統(tǒng)的業(yè)務邏輯事件和實驗七設計的主窗體界面進行連接，完成圖形用戶界面下的學生成績管理系統(tǒng),要包含文件的讀寫。4、實驗過程或源代碼import javax.swing.*;import javax.swing.table.*

2、;import java.awt.*;import java.awt.event.*;import java.io.*;import java.util.*;public class StudentManager extends JFrame private Container currentContainer = this; private String title = 學生成績管理系統(tǒng); private Font headFont = new Font(黑體,Font.PLAIN,18); private File data = new File(data.txt); private Da

3、taTable dataModel = new DataTable(); private JTable dataTable = new JTable(dataModel); private JLabel extraLabel = new JLabel(); private JPanel welcomePanel = createWelcomePanel(); private JPanel insertPanel = createInsertPanel(); private JPanel displayPanel = createDisplayPanel(); private JPanel mo

4、difyPanel = createModifyPanel(); public StudentManager() this.setLocation(300, 300); this.setSize(475,450); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setResizable(false); this.setTitle(title); this.createMenu(); this.add(welcomePanel); if(!data.exists() try new FileWriter(data); catc

5、h (IOException e) this.setVisible(true); private void createMenu() JMenuBar menubar = new JMenuBar(); JMenu manageMenu = new JMenu(管理); menubar.add(manageMenu); JMenu helpMenu = new JMenu(幫助); menubar.add(helpMenu); JMenuItem m_add = new JMenuItem(添加); JMenuItem m_manage = new JMenuItem(查看); JMenuIt

6、em m_modify = new JMenuItem(修改); JMenuItem m_export = new JMenuItem(導出); JMenuItem m_exit = new JMenuItem(退出); manageMenu.add(m_add); manageMenu.add(m_modify); manageMenu.add(m_manage); manageMenu.addSeparator(); manageMenu.add(m_export); manageMenu.addSeparator(); manageMenu.add(m_exit); m_add.addA

7、ctionListener(new ActionListener() public void actionPerformed(ActionEvent e) resetPanel(insertPanel); ); m_modify.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) resetPanel(modifyPanel); ); m_manage.addActionListener(new ActionListener() public void actionPerformed

8、(ActionEvent e) resetPanel(displayPanel); ); m_export.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) JFileChooser chooser = new JFileChooser(); int choose = chooser.showSaveDialog(currentContainer); if(choose=JFileChooser.APPROVE_OPTION) boolean flag = exportData(c

9、hooser.getSelectedFile(); if(flag) JOptionPane.showMessageDialog(currentContainer, 數(shù)據(jù)已經(jīng)成功導出到指定文件！,導出成功,JOptionPane.PLAIN_MESSAGE); else JOptionPane.showMessageDialog(currentContainer, 無法導出到指定文件！,導出失敗,JOptionPane.ERROR_MESSAGE); ); m_exit.addActionListener(new ActionListener() public void actionPerfo

10、rmed(ActionEvent e) System.exit(0); ); this.setJMenuBar(menubar); private void resetPanel(JPanel panel) this.setVisible(false); this.getContentPane().removeAll(); if(panel=displayPanel) loadData(); this.getContentPane().add(panel); this.setVisible(true); private JPanel createWelcomePanel() JPanel pa

11、nel = new JPanel(); JLabel title = new JLabel(學生成績管理系統(tǒng) ); title.setFont(headFont); panel.add(title); panel.setVisible(true); return panel; private JPanel createInsertPanel() JPanel panel = new JPanel(); panel.setLayout(null); panel.setFocusable(true); JLabel title = new JLabel(錄入學生成績); title.setFont

12、(headFont); panel.add(title); title.setBounds(175, 25, 120, 30); final String label = 學號,姓名,C語言,Java程序設計,高數(shù),英語; final JTextField textField = new JTextFieldlabel.length; for(int i=0;ilabel.length;i+) JLabel titleLabel = new JLabel(labeli + ：); titleLabel.setBounds(100, 80 + 40*i, 120, 30); panel.add(

13、titleLabel); textFieldi = new JTextField(20); textFieldi.setBounds(220, 80 + 40*i, 150, 24); panel.add(textFieldi); textField0.addFocusListener(new FocusListener() public void focusGained(FocusEvent e) public void focusLost(FocusEvent e) boolean flag = true; String s = ; if(!checkString(textField0.g

14、etText() flag = false; s = 學號不能為空！n; if(flag) if(!checkStudentNo(textField0.getText().trim() flag = false; s = 系統(tǒng)已存在該學號的信息！n; if(!flag) JOptionPane.showMessageDialog(currentContainer, s, 錯誤, JOptionPane.ERROR_MESSAGE); ); JButton addBtn = new JButton(錄入信息); panel.add(addBtn); addBtn.setBounds(140, 3

15、40, 105, 30); addBtn.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) int choose = JOptionPane.showConfirmDialog(currentContainer, 確認要錄入信息嗎？,錄入確認,JOptionPane.YES_NO_OPTION); if(choose=JOptionPane.NO_OPTION)return; boolean flag = true; String s = 錄入過程中發(fā)生了錯誤！n; for(int

16、 i=0; i2; i+) if(!checkString(textFieldi.getText() flag = false; s = s + labeli + 未填寫！n; for(int i=2; ilabel.length; i+) if(!checkInteger(textFieldi.getText() flag = false; s = s + labeli + 成績未填寫或輸入不是整數(shù)！n; if(flag) Student student = new Student(); student.setNo(textField0.getText().trim(); if(!check

17、StudentNo(student.getNo() flag = false; s = s + 系統(tǒng)中已存在相同學號的信息！n; else student.setName(textField1.getText().trim(); student.setAsmScore(Integer.parseInt(textField2.getText().trim(); student.setJavaScore(Integer.parseInt(textField3.getText().trim(); student.setNetScore(Integer.parseInt(textField4.getT

18、ext().trim(); student.setOsScore(Integer.parseInt(textField5.getText().trim(); flag = insertData(student); if(flag) JOptionPane.showMessageDialog(currentContainer, 錄入成功！,錄入成功,JOptionPane.PLAIN_MESSAGE); clearForm(textField); else JOptionPane.showMessageDialog(currentContainer, s,錄入失敗,JOptionPane.ERR

19、OR_MESSAGE); ); JButton clearBtn = new JButton(清空); panel.add(clearBtn); clearBtn.setBounds(280, 340, 60, 30); clearBtn.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) clearForm(textField); ); panel.setVisible(true); return panel; private JPanel createDisplayPanel()

20、 JPanel panel = new JPanel(); panel.setVisible(true); panel.add(new JLabel(學號：); final JTextField textField = new JTextField(10); panel.add(textField); panel.add(new JLabel(); JButton searchBtn = new JButton(查詢); panel.add(searchBtn); searchBtn.addActionListener(new ActionListener() public void acti

21、onPerformed(ActionEvent e) String no = textField.getText(); if(!checkString(no) JOptionPane.showMessageDialog(currentContainer, 未輸入學號！,查詢失敗,JOptionPane.ERROR_MESSAGE); return; if(checkStudentNo(no) JOptionPane.showMessageDialog(currentContainer, 不存在該學號的學生信息！,查詢失敗,JOptionPane.ERROR_MESSAGE); return;

22、loadStudentInfo(no); ); JButton deleteBtn = new JButton(刪除); panel.add(deleteBtn); deleteBtn.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) String no = textField.getText(); if(!checkString(no) JOptionPane.showMessageDialog(currentContainer, 未輸入學號！,刪除失敗,JOptionPane.

23、ERROR_MESSAGE); return; if(checkStudentNo(no) JOptionPane.showMessageDialog(currentContainer, 不存在該學號的學生信息！,刪除失敗,JOptionPane.ERROR_MESSAGE); return; int choose = JOptionPane.showConfirmDialog(currentContainer, 確定要刪除學號為 + no + 的學生的信息嗎？,刪除確認,JOptionPane.YES_NO_OPTION); if(choose=JOptionPane.NO_OPTION)r

24、eturn; boolean flag = deleteData(no); if(!flag) JOptionPane.showMessageDialog(currentContainer, 刪除過程中發(fā)生了錯誤！,刪除失敗,JOptionPane.ERROR_MESSAGE); return; resetPanel(displayPanel); JOptionPane.showMessageDialog(currentContainer, 已經(jīng)刪除了該學號學生的信息！,刪除成功,JOptionPane.PLAIN_MESSAGE); textField.setText(); ); JButt

25、on allBtn = new JButton(查看所有信息); panel.add(allBtn); allBtn.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) textField.setText(); loadData(); ); dataTable.setAutoscrolls(true); dataTable.setPreferredScrollableViewportSize(new Dimension(420, 300); panel.add(new JScroll

26、Pane(dataTable); panel.add(extraLabel); return panel; private void loadData() ArrayList dataList = displayDataList(); dataModel.update(dataList); dataModel.fireTableDataChanged(); dataTable.updateUI(); extraLabel.setText(當前系統(tǒng)中共有 + dataList.size() + 條信息); private void loadStudentInfo(String no) dataM

27、odel.update(selectStudent(no); dataModel.fireTableDataChanged(); dataTable.updateUI(); extraLabel.setText(當前正在查詢學號為 + no + 的學生信息); private JPanel createModifyPanel() JPanel panel = new JPanel(); panel.setLayout(null); panel.setFocusable(true); JLabel title = new JLabel(修改學生成績); title.setFont(headFon

28、t); panel.add(title); title.setBounds(175, 25, 120, 30); final String label = 學號,姓名,C語言,Java程序設計,高數(shù),英語; final JTextField textField = new JTextFieldlabel.length; for(int i=0;ilabel.length;i+) JLabel titleLabel = new JLabel(labeli + ：); titleLabel.setBounds(100, 80 + 40*i, 120, 30); panel.add(titleLab

29、el); textFieldi = new JTextField(20); textFieldi.setBounds(220, 80 + 40*i, 150, 24); panel.add(textFieldi); textField0.addFocusListener(new FocusListener() public void focusGained(FocusEvent e) public void focusLost(FocusEvent e) boolean flag = true; String s = ; if(!checkString(textField0.getText()

30、 flag = false; s = 學號不能為空！n; if(flag) Student student = selectStudent(textField0.getText().trim(); if(student = null) flag = false; s = 系統(tǒng)中不存在該學號的信息！n; else textField1.setText(student.getName(); textField2.setText(String.valueOf(student.getAsmScore(); textField3.setText(String.valueOf(student.getJav

31、aScore(); textField4.setText(String.valueOf(student.getNetScore(); textField5.setText(String.valueOf(student.getOsScore(); if(!flag) JOptionPane.showMessageDialog(currentContainer, s, 錯誤, JOptionPane.ERROR_MESSAGE); clearForm(textField); ); JButton modifyBtn = new JButton(修改信息); panel.add(modifyBtn)

32、; modifyBtn.setBounds(140, 340, 105, 30); modifyBtn.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) int choose = JOptionPane.showConfirmDialog(currentContainer, 確認要修改信息嗎？,修改確認,JOptionPane.YES_NO_OPTION); if(choose=JOptionPane.NO_OPTION)return; boolean flag = true; S

33、tring s = ; if(!checkString(textField0.getText() flag = false; s = 學號不能為空！n; if(flag) Student student = selectStudent(textField0.getText().trim(); if(student = null) flag = false; s = 系統(tǒng)中不存在該學號的信息！n; else student.setName(textField1.getText().trim(); student.setAsmScore(Integer.parseInt(textField2.ge

34、tText().trim(); student.setJavaScore(Integer.parseInt(textField3.getText().trim(); student.setNetScore(Integer.parseInt(textField4.getText().trim(); student.setOsScore(Integer.parseInt(textField5.getText().trim(); flag = modifyData(student); if(flag) JOptionPane.showMessageDialog(currentContainer, 修

35、改成功！,修改成功,JOptionPane.PLAIN_MESSAGE); clearForm(textField); else JOptionPane.showMessageDialog(currentContainer, s,修改失敗,JOptionPane.ERROR_MESSAGE); ); JButton clearBtn = new JButton(清空); panel.add(clearBtn); clearBtn.setBounds(280, 340, 60, 30); clearBtn.addActionListener(new ActionListener() public

36、 void actionPerformed(ActionEvent e) clearForm(textField); ); panel.setVisible(true); return panel; private boolean exportData(File file) try if(file.equals(data)return false; FileWriter writer = new FileWriter(file); BufferedReader reader = new BufferedReader(new FileReader(data); String s; while(s

37、 = reader.readLine()!=null) writer.write(s+rn); reader.close(); writer.close(); return true; catch(Exception e) return false; private boolean insertData(Student student) try String result = student.getNo() + , + student.getName() +, + student.getAsmScore() + , + student.getJavaScore() + , + student.

38、getNetScore() + , + student.getOsScore() + rn; FileWriter writer = new FileWriter(data, true); writer.write(result); /* 關閉對象 */ writer.close(); return true; catch(Exception e) /* 遇到異常即操作失敗，返回false */ return false; private boolean modifyData(Student student) try BufferedReader reader = new BufferedRe

39、ader(new FileReader(data); String s,result = ; while(s = reader.readLine()!=null) String temp = s.split(,); if(student.getNo().equals(temp0) result = result + student.getNo() + , + student.getName() +, + student.getAsmScore() + , + student.getJavaScore() + , + student.getNetScore() + , + student.get

40、OsScore() + rn; else result = result + s + rn; reader.close(); FileWriter writer = new FileWriter(data); writer.write(result); writer.close(); return true; catch(Exception e) return false; private boolean deleteData(String no) try BufferedReader reader = new BufferedReader(new FileReader(data); Stri

41、ng s,result = ; while(s = reader.readLine()!=null) String temp = s.split(,); if(no.equals(temp0) continue; result = result + s + rn; reader.close(); FileWriter writer = new FileWriter(data); writer.write(result); writer.close(); return true; catch(Exception e) return false; private boolean checkStud

42、entNo(String no) try boolean flag = true; BufferedReader reader = new BufferedReader(new FileReader(data); String s; while(s=reader.readLine()!=null) if(no.equals(s.split(,)0) flag = false; break; reader.close(); return flag; catch(Exception e) return false; private boolean checkString(String text)

43、if(text.trim().length()=0) return false; return true; private boolean checkInteger(String text) if(text.trim().length()=0) return false; try Integer.parseInt(text); catch(Exception e) return false; return true; private void clearForm(JTextField textField) /* 清空傳來的文本框數(shù)組的內(nèi)容 */ for(int i=0; itextField.

44、length; i+) textFieldi.setText(); private Student selectStudent(String no) try BufferedReader reader = new BufferedReader(new FileReader(data); Student student = null; String s; while(s = reader.readLine()!=null) String temp = s.split(,); if(no.equals(temp0) student = new Student(); student.setNo(te

45、mp0); student.setName(temp1); student.setAsmScore(Integer.parseInt(temp2); student.setJavaScore(Integer.parseInt(temp3); student.setNetScore(Integer.parseInt(temp4); student.setOsScore(Integer.parseInt(temp5); break; reader.close(); return student; catch(Exception e) return null; private ArrayList d

46、isplayDataList() ArrayList dataList = new ArrayList(); try BufferedReader reader = new BufferedReader(new FileReader(data); String s; while(s=reader.readLine()!=null) try String temp = s.split(,); Student student = new Student(); student.setNo(temp0); student.setName(temp1); student.setAsmScore(Integer.parseInt(temp2); student.setJavaScore(Integer.parseInt(temp3); student.setNetScore(Integer.parseInt(temp4); student.setOsScore(Integer.parseInt(temp5); dataList.add(student); catch(Exception e) continue