Java完整的学生选课系统源码(共15页)

1、精选优质文档-倾情为你奉上Java完整的学生选课系统源码需求分析：写一个较为严谨的学生选课系统，实现学生可以选择多门选课课程，并将有效选课结果保存到数据库。学生需要登录后，才能选课。让学生可以在选课系统通过多种方式查询到要选的课程信息。/选课规则：1、每个学生可以选多门课程，多次选课的总学分不能超过6学分；2、不能重复选择一门课程；3、每一门课程的选课人数都有数量限制，当某门课程的选课名额满时，则应另选课程。4、凭用户名和密码登录，通过提交某一课程号来选课/总体设计方案：建立三个类：登录类register，选课类studentChooseCourse,数据库工具类JDBCUtil；一个SQL脚

2、本文件用于生成数据库表结构和初始记录，以搭建数据库环境。登录类register类，负责对用户的身份进行验证；工具类JDBCUtil用于实现连接，你可调用JDBCUtil的getConnection()方法等到链接。选课类studentChooseCourse用于，实现选课功能。其中包括几个主要方法：1、actionPerformed(ActionEvent) 用于监听用户“查询”和“提交”操作，并负责调用各种方法对其进行处理2、createSearchCourse()用于产生图形用户界面3、processBeforeCommit()用于对用户的“提交”查找进行验证，剔除无效的用户操作4、try

3、Commit()负责对有效的“提交”操作，进一步处理，并将有效的操作结果时时保存到数据库，并更新数据库原有信息/本程序用到的知识点：数据库连接JDBC；SQL建表、插入输入、动态查询；图形用户界面的产生以及处理查询结果集并较好显示；程序设计基础知识。 /代码如下：import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.sql.*;import javax.swing.*;import javax.swing.table.Defaul

4、tTableModel;import school.schoolPicture.JdbcUtil;public class StudentChooseCourse extends JFrame implements ActionListener JTextField jtfSearch = new JTextField(11);String columnNames = new String "课程ID", "课程名", "学时", "学分", "学期", "性质" ;Defa

5、ultTableModel dtmSearch = new DefaultTableModel(columnNames, 27);JTable jtSearch = new JTable(dtmSearch);JScrollPane jspSearch = new JScrollPane(jtSearch);JComboBox jcbSearch = new JComboBox();JTextField jtfSelectedCourse = new JTextField(10);Connection con = null;PreparedStatement ps = null;ResultS

6、et rs = null;private static String usrName;private static String passwrd;/在构造方法中添加两个参数。以便在"提交"时，将学生的身份连同所选的课程，一同记录在学生选课表中。public StudentChooseCourse(String usrName, String passwrd) createSearchCourse();this.usrName = usrName;this.passwrd = passwrd;public String getUsrName() return usrName;

7、public void setUsrName(String usrName) this.usrName = usrName;public String getPasswrd() return passwrd;public void setPasswrd(String passwrd) this.passwrd = passwrd; /根据用户的时间，做出相应的反映public void actionPerformed(ActionEvent e) String str = e.getActionCommand();/清空结果显示区中的内容，如果有的话。if ("查询".tr

8、im().equals(str) int k = 1;while (k < 10) for (int i = 1; i < 7; i+) jtSearch.setValueAt(null, k - 1, i - 1);k+;/调用下面的这个方法，在数据库中进行查找，并将结果显示在表格中。searchAvailableCourse(); else if ("提交".equals(str) /processBeforeCommit()对用户选课操作进行有效性检验；/剔除无效操作：如输入无效的课程号，或已经选择了某一课程，已经选满的6学分等各种情况boolean ef

9、fect=processBeforeCommit(); /如果课程存在，且该学生具有选择该课程的资格，即effect为true,进入正式提交程序(tryCommit()if(effect=true)tryCommit();/对用户选课操作进行有效性检验；public boolean processBeforeCommit()/清空原结果显示区中的内容，如果有的话。int k = 1;while (k < 10) for (int i = 1; i < 7; i+) jtSearch.setValueAt(null, k - 1, i - 1);k+;/取得用户输入的课程号Strin

10、g userInput = jtfSelectedCourse.getText().toString().trim().toLowerCase();/无效操作1：在数据库中的coursexx表中查询该课程号。如果不存在该课程，给出提示。String sql = "select cno from coursexx where cno=? "boolean flagCourseExist = false;try ps = con.prepareStatement(sql);ps.setString(1, userInput);rs = ps.executeQuery();fla

11、gCourseExist = rs.next(); catch (Exception eC) eC.printStackTrace();if (!flagCourseExist) JOptionPane.showMessageDialog(null, "该课程不存在，请重新输入");return false;/判断该学生选修课已选课程的总学分是否小于6；/无效操作2：如果已有选课记录，并且总学分大于6学分，该学生不能在选了。PreparedStatement ps = null;sql = "select sum(grade) "+ "from

12、 (select x.sname , o,k.grade grade "+ "from coursexx k join choicesxx x "+ "on o=o and x.sname=?) result"String grade =null;try ps = con.prepareStatement(sql);ps.setString(1, usrName);rs = ps.executeQuery();while (rs.next() grade = rs.getString(1);if(grade=null)grade="0

13、" catch (Exception rrr) rrr.printStackTrace();System.out.println("总学分：" + grade);if (Integer.parseInt(grade) > 6) JOptionPane.showMessageDialog(null, "你已经选满6学分，系统将退出");this.setVisible(false);return false;/无效操作3：课程该学生已经选择了某课程，则不能再选该课程了。sql = "select * from choicesxx w

14、here sname=? and cno=?"boolean flag = false;try ps = con.prepareStatement(sql);ps.setString(1, this.getUsrName();ps.setString(2, userInput);rs = ps.executeQuery();flag = rs.next(); catch (Exception eaa) eaa.printStackTrace();if (flag) JOptionPane.showMessageDialog(null, "你已经选择了该课程。请另选课程&qu

15、ot;);return false;/如果以上无效操作都不存在，则返回true，意为这是一个准有效操作return true;/对有效的提交操作的进行处理public void tryCommit() / userInput为用户输入的课程ID.String userInput = jtfSelectedCourse.getText().toString().trim().toLowerCase();/ if course still available(count<MAX_STUDENT),save result./ else if course not available,show

16、Message to student.PreparedStatement ps;String sql = "select (Max-selectedCount) as RemainedCount "+ "from Coursexx where cno=?"try ps = con.prepareStatement(sql);/ 取得学生ID或名字，将课程ID存入学生选课表choicesxxps.setString(1, userInput);rs = ps.executeQuery();ResultSetMetaData meta = rs.getMet

17、aData();int cols = meta.getColumnCount();int RemainedCount = -1;while (rs.next() RemainedCount = rs.getInt(1);System.out.println("RemainedCount:" + RemainedCount);/如果该课程还有选择的名额，提示单项选课操作成功。if (RemainedCount > 0) / save studentId and courseId to student-course table./ this.getUsrName();us

18、erInputsql = "insert into choicesxx values(?,?)"ps = con.prepareStatement(sql);ps.setString(1, this.getUsrName();ps.setString(2, userInput);ps.executeUpdate();JOptionPane.showMessageDialog(null, "选课成功： " + this.getUsrName()+ " 选了" + userInput + "." + "&qu

19、ot; + " 还有 " + RemainedCount+ " 人可以选该课程。");/ 更新课程中已选该课程的人数：即将可选该课程的人数减去1个人。sql = "update CourseXX set selectedCount=selectedCount+1 where cno=?"ps = con.prepareStatement(sql);ps.setString(1, userInput);ps.executeUpdate();mit();/如果该课程已经没有选择名额，提示重新选课 catch (Exception es)

20、es.printStackTrace();try con.rollback(); catch (Exception ey) ey.printStackTrace();/对用户查询课程信息，进行处理，并显示查询结果public void searchAvailableCourse() / 让程序自动选择连接的是Oracle或SqlServer.if (JDBCUtil.getConnection() != null) System.out.println(JDBCUtil.getConnection();con = JDBCUtil.getConnection(); else con = Jdb

21、cUtil.getConnection();/userInput取得用户输入的信息,selectedItem取得用户选择的查询方式String userInput = jtfSearch.getText().toString().trim().toLowerCase();String selectedItem = jcbSearch.getSelectedItem().toString().trim();System.out.println("User search:" + userInput);System.out.println("selectedItem:&

22、quot; + selectedItem);String sql = null;/按用户查询方式，如按课程名，课程ID或学时的查询进行处理；并在表格中实现结果try if ("课程名".equals(selectedItem) sql = "select cno,cname,hour,grade,term,isNeed from CourseXX where cname = ?"ps = con.prepareStatement(sql);ps.setString(1, userInput); else if ("课程ID".equa

23、ls(selectedItem) sql = "select cno,cname,hour,grade,term,isNeed from CourseXX where cno = ?"ps = con.prepareStatement(sql);ps.setString(1, userInput); else if ("学时".equals(selectedItem) sql = "select cno,cname,hour,grade,term,isNeed from CourseXX where hour = ?"ps = con

24、.prepareStatement(sql);ps.setInt(1, Integer.parseInt(userInput); else if ("学分".equals(selectedItem) sql = "select cno,cname,hour,grade,term,isNeed from CourseXX where grade = ?"ps = con.prepareStatement(sql);ps.setInt(1, Integer.parseInt(userInput); else if ("学期".equals

25、(selectedItem) sql = "select cno,cname,hour,grade,term,isNeed from CourseXX where term = ?"ps = con.prepareStatement(sql);ps.setString(1, userInput);System.out.println(sql);rs = ps.executeQuery();mit();ResultSetMetaData meta = rs.getMetaData();int cols = meta.getColumnCount();String result

26、 = null;int k = 1;boolean flag = false;/将查询结果以表格的形式显示出来while (rs.next() for (int i = 1; i <= cols; i+) result = rs.getString(i);System.out.println(result);jtSearch.setValueAt(result, k - 1, i - 1);k+;flag = true;/如果查询结果集为空，提示用户没有该课程if (flag = false) JOptionPane.showMessageDialog(null, "该课程不存

27、在，请重新输入");return; catch (Exception ex) ex.printStackTrace();try con.rollback(); catch (Exception er) er.printStackTrace();/产生图形用户界面，以便用户操作public void createSearchCourse() this.setLayout(new GridLayout(3, 1);JPanel jp1 = new JPanel();jp1.setLayout(new GridLayout(4, 1);JPanel jp2 = new JPanel();J

28、Panel jp3 = new JPanel();JPanel jp10 = new JPanel();JPanel jp11 = new JPanel();JPanel jp12 = new JPanel();JPanel jp13 = new JPanel();JLabel jlSearch = new JLabel(" 学 生 选 课 系 统 ");jp11.add(jlSearch);jcbSearch.addItem(new String("课程名");jcbSearch.addItem(new String("课程ID")

29、;jcbSearch.addItem(new String("学时");jcbSearch.addItem(new String("学分");jcbSearch.addItem(new String("学期");jp12.add(jtfSearch);jp12.add(jcbSearch);JButton jbOK = new JButton("查询");jbOK.addActionListener(this);jbOK.setSize(90, 20);jp13.add(jbOK);jp1.add(jp10);jp

30、1.add(jp11);jp1.add(jp12);jp1.add(jp13);jp2.add(jspSearch);JLabel jlSelectedCourse = new JLabel("请输入课程ID：");JButton jbSelectedCourse = new JButton("提交");jbSelectedCourse.addActionListener(this);jp3.add(jlSelectedCourse);jp3.add(jtfSelectedCourse);jp3.add(jbSelectedCourse);this.ad

31、d(jp1);this.add(jp2);this.add(jp3);this.setVisible(true);this.setSize(485, 600);/当某学生有效登录后，启动程序（将学生的登录信息也传过来，以便保存选课操作时使用）public static void main(String args) /String usrName = "xuliang"/String passwrd = "123"new StudentChooseCourse(usrName, passwrd);/-以下为搭建学生选课系统的SQL脚本文件。只需运行一次，就

32、可有完整的数据库表结构和初始记录。 /-/该脚本针对SQLserver；Oracle的SQL脚本类似，只需将将数据类型如varchar改为varchar2,int改为number等-table1: registerXU 登录表drop table registerXu;create table registerXu (id varchar(20),userName varchar(20),passWord varchar(20),identify varchar(20);insert into registerXu values('s001','xuliang'

33、,'123','学生');insert into registerXu values('s002','xuliang2','1234','学生');insert into registerXu values('j001','jack','12345','学生');insert into registerXu values('001','user','user','学生');

34、insert into registerXu values('z001','zlm','corejava','老师');-String sql = "select * from registerXu "-+ "where userName=? and passWord=? and identify=?"-table 2:Coursexx课程表drop table Coursexx;create table Coursexx(cno varchar(20) primary key,cname

35、varchar(20),hour Int,grade Int,term varchar(20),isNeed varchar(20), selectedCount Int ,Max Int);insert into Coursexx values('c001','Core',50,5,'','NoNecessary',0,50);insert into Coursexx values('c002','XML',20,2,'','NoNecessary',0,40);i

36、nsert into Coursexx values('c003','HIBERNATE',20,4,'','NoNecessary',0,30);insert into Coursexx values('c004','SQL',20,4,'','NoNecessary',0,5);insert into Coursexx values('c005','JDBC',20,2,'','NoNecessary'

37、;,0,3);insert into Coursexx values('c006','AJAX',20,2,'','NoNecessary',0,1);insert into Coursexx values('c007','JSP',100,8,'','NoNecessary',0,1-sql = "select cno,cname,hour,grade,term,isNeed from CourseXX where cname = ?" 

38、0;-table 3:学生表-drop table studentxx;create table studentxx(sid varchar(20),sname varchar(20) primary key,sex varchar(20),birthday varchar(20),className varchar(20), image varchar(20);insert into studentxx values('s001','xuliang','male','','sd1003','good

39、9;);insert into studentxx values('s002','xuliang2','male','','sd0910','good');insert into studentxx values('j001','jack','male','','sd1003','good');insert into studentxx values('001','user'

40、;,'male','','sd1005','good');insert into studentxx values('s003','sisi','female','','sd1007','good');insert into studentxx values('as003','crystal','female','','asd1007','good&

41、#39;);-table 4:choices学生选课表drop table choicesxx;create table choicesxx(sname varchar(20) references studentxx(sname),cno varchar(20) references coursexx(cno);-判断某一个学生已经选的课程的总学分是否小于6分/-用户登录类 -/用途：验证用户是否具有登录系统的资格-package school;import javax.swing.*;import school.schoolPicture.JdbcUtil;import java.sql.

42、*;import java.awt.*;import java.awt.event.*;public class Register implements ActionListener JFrame jf = new JFrame("学生成绩管理与选课系统");JTextField jtfUserName = new JTextField(10);JPasswordField jpfPassWord = new JPasswordField(10);JComboBox identify = new JComboBox();/constructorpublic Register

43、() CreateRegisterGUI();/ deal with user action, when user check:"登录","取消"or "注册"public void actionPerformed(ActionEvent e) String str = e.getActionCommand();if (str.equalsIgnoreCase("登录") /当用户点击登录时，调用以下方法去数据库做匹配processLogin(); else if (str.equalsIgnoreCase(&qu

44、ot;取消") jtfUserName.setText("");jpfPassWord.setText(""); else if (str.equalsIgnoreCase("注册") new CreateLogin();/当用户点击登录时，调用以下方法去数据库做匹配public void processLogin() / create connection to the database.Connection con = null;/ Connection con = JDBCUtil.getConnection();/让

45、程序自动连接相应的数据库,以避免连接数据库时频繁改动连接程序if (JdbcUtil.class = null) /连接达内Oracle数据库con = JdbcUtil.getConnection(); else /连接本地SQLSERVER数据库con = JDBCUtil.getConnection();/ write sql sentenceString usrName = jtfUserName.getText().trim();String passwrd = new String(jpfPassWord.getPassword().trim();String ident = id

46、entify.getSelectedItem().toString().trim();String sql = "select * from registerXu "+ "where userName=? and passWord=? and identify=?"System.out.println(usrName + ":" + passwrd + ":" + ident);/ create object of PreparedStatementtry PreparedStatement ps = con.pr

47、epareStatement(sql);/ Prepare parameter for the sqlps.setString(1, usrName);ps.setString(2, passwrd);ps.setString(3, ident);/ send parameter to compiler to compile.ResultSet rs = ps.executeQuery();StringBuffer sb = new StringBuffer("");ResultSetMetaData meta = rs.getMetaData();int cols = m

48、eta.getColumnCount();/you can use another simple way to check whether the people has records in database:/define a boolean flag=false, if has record change it/to true;otherwise, if flag=flase,showMessage("Input ERROR")while (rs.next() for (int i = 1; i < cols; i+) sb.append(meta.getColu

49、mnName(i);sb.append(rs.getString(i); if (sb.length() < 1) JOptionPane.showMessageDialog(null, "用户名或密码错误"); else if (sb.length() >= 1) if (ident.equals("student") /if he or she is a student, and usrName-passwrd alright, then go to 学生选课系统new StudentChooseCourse(usrName, passw

50、rd);jf.setVisible(false);/ new StudentEntered(); else if (ident.equals("teacher") / new TeacherEntered(usrName,passwrd);new TeacherEntered();jf.setVisible(false); else if (ident.equals("admin") / go to administrator pages. catch (Exception er) er.printStackTrace();/当用户点击登录时，调用以下方

51、法去数据库做匹配public void processLogin() / create connection to the database.Connection con = null;/ Connection con = JDBCUtil.getConnection();/让程序自动连接相应的数据库,以避免连接数据库时频繁改动连接程序if (JdbcUtil.class = null) /连接达内Oracle数据库con = JdbcUtil.getConnection(); else /连接本地SQLSERVER数据库con = JDBCUtil.getConnection();/ wri

52、te sql sentenceString usrName = jtfUserName.getText().trim();String passwrd = new String(jpfPassWord.getPassword().trim();String ident = identify.getSelectedItem().toString().trim();String sql = "select * from registerXu "+ "where userName=? and passWord=? and identify=?"System.o

53、ut.println(usrName + ":" + passwrd + ":" + ident);/ create object of PreparedStatementtry PreparedStatement ps = con.prepareStatement(sql);/ Prepare parameter for the sqlps.setString(1, usrName);ps.setString(2, passwrd);ps.setString(3, ident);/ send parameter to compiler to compile.ResultSet rs = ps.executeQuery();StringBuffer sb = new StringBuffer("");ResultSetMetaData meta = rs.getMe