运行结果：
数据库的2个表：
course表
student表
ps：一定要build path导入数据库用的jar包，以及在在lib文件夹中导入数据库jar包
文件目录结构：
具体代码：
index.jsp 首页
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
欢迎进入选课系统
欢迎进入选课 系统
学生登录
学生注册
管理员登录
login.jsp 学生登录
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
学生登录
学生登录
regist.jsp 学生注册
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
注册
注册页面
您有账号？点击直接登录
studentIndex.jsp 学生选课主页
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ page contentType="text/html; ISO-8859-1" language="java" import="java.util.*" pageEncoding="utf-8" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
学生选课
退出登录
学生选课界面
课程名称
剩余量
总数量
任课教师
课程地点
课程时间
课程时长
操作
${courseList.courseName }
${courseList.courseRemain }
${courseList.courseTotal }
${courseList.courseTeacher }
${courseList.coursePlace }
${courseList.courseTime }
${courseList.courseTimelength }
我的选课
studentInfo.jsp 学生已选的课程展示
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ page contentType="text/html; ISO-8859-1" language="java" import="java.util.*" pageEncoding="utf-8" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
学生课程
课程名称
任课教师
课程地点
课程时间
课程时长
操作
${studentCourseList.courseName }
${studentCourseList.courseTeacher }
${studentCourseList.coursePlace }
${studentCourseList.courseTime }
${studentCourseList.courseTimelength }
admin.jsp 管理员登录
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
管理员登录
管理员登录
<%
String error = (String)session.getAttribute("error");
if(error!=null&&error.length()!=0){
out.println(error);
}
%>
adminCourse.jsp 管理课程页面
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
课程后台管理
退出登录
选课后台管理
编号
课程名
任课老师
上课地点
上课时间
课时
总人数
剩余数
操作
${courseList.courseId}
${courseList.courseName }
${courseList.courseTeacher }
${courseList.coursePlace }
${courseList.courseTime }
${courseList.courseTimelength }
${courseList.courseTotal }
${courseList.courseRemain }
checkadmin.jsp 检查管理员账号密码
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
check
<% String adno=request.getParameter("adno");
String adpassword = request.getParameter("adpassowrd");
if(adno==null||adno.length()==0||adpassword==null ||adpassword.length()==0){
request.getSession().setAttribute("error", "账号或密码错误");
response.sendRedirect("admin.jsp");
}else{
if(!adno.equals("admin")||!adpassword.equals("admin")){
request.getSession().setAttribute("error", "账号或密码错误");
response.sendRedirect("admin.jsp");
}else{
request.getSession().setAttribute("error", "");
response.sendRedirect("/xxmtest6/FindCourseServlet");
}
}
%>
bean
Student.java 学生实体
package xxm.bean;
/**
* 学生实体类
* @author xxm
*
*/
public class Student {
String no;
String name;
String passwd;
String major;
String grade;
String sclass;
String selectedCourse;
public Student() {
}
public String getSelectedCourse() {
return selectedCourse;
}
public void setSelectedCourse(String cid) {
this.selectedCourse = cid;
}
public String getNo() {
return no;
}
public void setNo(String no) {
this.no = no;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPasswd() {
return passwd;
}
public void setPasswd(String passwd) {
this.passwd = passwd;
}
public String getMajor() {
return major;
}
public void setMajor(String major) {
this.major = major;
}
public String getGrade() {
return grade;
}
public void setGrade(String grade) {
this.grade = grade;
}
public String getSclass() {
return sclass;
}
public void setSclass(String sclass) {
this.sclass = sclass;
}
}
Course.java 课程实体类
package xxm.bean;
/**
* 课程
*
* @author xxm
*
*/
public class Course {
int courseId;
String courseName;
int courseRemain;
int courseTotal;
String courseTeacher;
String coursePlace;
String courseTime;
String courseTimelength;
public Course() {
}
public int getCourseId() {
return courseId;
}
public void setCourseId(int courseId) {
this.courseId = courseId;
}
public String getCourseName() {
return courseName;
}
public void setCourseName(String courseName) {
this.courseName = courseName;
}
public int getCourseRemain() {
return courseRemain;
}
public void setCourseRemain(int courseRemain) {
this.courseRemain = courseRemain;
}
public int getCourseTotal() {
return courseTotal;
}
public void setCourseTotal(int courseTotal) {
this.courseTotal = courseTotal;
}
public String getCourseTeacher() {
return courseTeacher;
}
public void setCourseTeacher(String courseTeacher) {
this.courseTeacher = courseTeacher;
}
public String getCoursePlace() {
return coursePlace;
}
public void setCoursePlace(String coursePlace) {
this.coursePlace = coursePlace;
}
public String getCourseTime() {
return courseTime;
}
public void setCourseTime(String courseTime) {
this.courseTime = courseTime;
}
public String getCourseTimelength() {
return courseTimelength;
}
public void setCourseTimelength(String courseTimelength) {
this.courseTimelength = courseTimelength;
}
}
数据库操作
DBO
DBOper.java
package xxm.database;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import xxm.bean.Student;
import xxm.dao.StudentDao;
public class DBOper {
//驱动
private static String driver = "com.mysql.cj.jdbc.Driver";
//database名，选择我要用的数据库shiyan6
private static String url = "jdbc:mysql://localhost:3306/shiyan6?serverTimezone=UTC";
//验证用户名和密码
private static String username = "root";
private static String passwd= "123456";
//数据库的连接对象
private static Connection conn = null;
//Statement对象
private static PreparedStatement ps = null;
ResultSet rs = null;
/**
* 连接数据库
* @return
* @throws SQLException
*/
public Connection getConnection() throws SQLException {
try {
Class.forName(driver);
conn = DriverManager.getConnection(url,username,passwd);//连接数据库
} catch (ClassNotFoundException e) {
System.err.println("无法连接数据库！");
}//加载驱动
return conn;
}
//执行sql语句，可以进行查询
public ResultSet executeQuery(String preparedSql,String []param){
try{
ps = conn.prepareStatement(preparedSql);
if(param != null){
for (int i = 0; i < param.length; i++) {
ps.setString(i + 1, param[i]);
}
}
rs = ps.executeQuery();
}catch(SQLException e){
e.printStackTrace();
}
return rs;
}
//执行sql语句，增加，修改，删除
public int executeUpdate(String preparedSql,String[]param){
int num = 0;
try{
ps = conn.prepareStatement(preparedSql);
if(ps != null){
for (int i = 0; i < param.length; i++) {
ps.setString(i + 1, param[i]);
}
}
num = ps.executeUpdate();
}catch(SQLException e){
e.printStackTrace();
}
return num;
}
public static void main(String[] args) {
try {
DBOper dao = new DBOper();
Connection conn=dao.getConnection();
if(conn!=null)
{
System.out.println("连接数据库正常");
}
else {
System.out.println("连接数据库异常");
}
} catch (Exception ex) {
// TODO: handle exception
ex.printStackTrace();
}
}
}StudentDao.java
package xxm.dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import xxm.bean.Student;
import xxm.database.DBOper;
public class StudentDao extends DBOper{
Connection conn =null;
public StudentDao() {
try {
conn= super.getConnection();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* 添加学生用户
* @param student
* @return
*/
public boolean addUser(Student student){
boolean r = false;
String sql = "INSERT INTO student(sno,sname,spassword,smajor,sclass,sgrade) VALUES(?,?,?,?,?,?);";
try{
int num = this.executeUpdate(sql,new String[]{student.getNo(),student.getName(),student.getPasswd(),student.getMajor(),student.getSclass(),student.getGrade()});
if(num > 0){
r = true;
}
}catch(Exception e){
e.printStackTrace();
}finally{
//this.closeAll();
}
return r;
}
}
CourseDao.java
package xxm.dao;
import java.sql.Connection;
import java.sql.SQLException;
import xxm.bean.Course;
import xxm.bean.Student;
import xxm.database.DBOper;
/**
* 课程管理
*
* @author xxm
*
*/
public class CourseDao extends DBOper{
Connection conn =null;
public CourseDao(){
try {
conn= super.getConnection();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* 添加选课课程
* @param course
* @return
*/
public boolean addCourse(Course course){
boolean r = false;
String sql = "INSERT INTO course(course_Name,course_Remain,course_Total,course_Teacher,course_Place,course_Time,course_Timelength) VALUES(?,?,?,?,?,?,?);";
try{
int num = this.executeUpdate(sql,new String[]{course.getCourseName(),String.valueOf(course.getCourseRemain()),String.valueOf(course.getCourseTotal()),course.getCourseTeacher(),course.getCoursePlace(),course.getCourseTime(),course.getCourseTimelength()});
if(num > 0){
r = true;
}
}catch(Exception e){
e.printStackTrace();
}finally{
//this.closeAll();
}
return r;
}
/**
* 更新
* @param course
* @return
*/
public boolean update(Course course) {
String sql = "update course set course_Name=?,course_Teacher=?,course_Place=?,course_Time=?,course_Timelength=?,course_Total=?,course_Remain=? where course_Id = ? ";
int num = this.executeUpdate(sql, new String[]{course.getCourseName(),
course.getCourseTeacher(),
course.getCoursePlace(),
course.getCourseTime(),
course.getCourseTimelength(),
String.valueOf(course.getCourseTotal()),
String.valueOf(course.getCourseRemain()),
String.valueOf(course.getCourseId())});
if(num>0)
return true;
else return false;
}
}
Servlet
处理学生选课的servlet
RegisterServlet.java 学生注册
package xxm.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.SQLException;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import xxm.bean.Student;
import xxm.dao.StudentDao;
@WebServlet("/RegisterServlet")
public class RegisterServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public RegisterServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doPost(request,response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset = utf-8");
String userno = request.getParameter("userNo");
String username = request.getParameter("userName");
String userpass = request.getParameter("password");
String major = request.getParameter("major");
String grade = request.getParameter("grade");
String sclass = request.getParameter("sclass");
PrintWriter out = response.getWriter();
Student user = new Student();
user.setNo(userno);
user.setName(username);
user.setPasswd(userpass);
user.setMajor(major);
user.setGrade(grade);
user.setSclass(sclass);
StudentDao dao = new StudentDao();
try {
Connection conn = dao.getConnection();
if(conn!=null) {
out.print("conn is not null");
}
if(dao.addUser(user)){
out.print("注册成功！");
response.sendRedirect("login.jsp");
}
else{
out.print("注册失败！");
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
LoginServlet.java 学生登录
package xxm.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import xxm.database.DBOper;
/**
* Servlet implementation class LoginServlet
*/
@WebServlet("/LoginServlet")
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public LoginServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doPost(request,response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset = utf-8");
PrintWriter out = response.getWriter();
String stuno = request.getParameter("stuno");
String stupass = request.getParameter("stupassowrd");
DBOper db = new DBOper();
try {
db.getConnection();
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
String sql = "SELECT sno,spassword FROM student WHERE sno = ? AND spassword = ?";
ResultSet rs = db.executeQuery(sql,new String[]{stuno,stupass});
try {
if(rs != null && rs.next()){
HttpSession session = request.getSession();
session.setAttribute("numSession", stuno);
Cookie cookie = new Cookie("stuno",stuno);
cookie.setMaxAge(60*60*24*30);
response.addCookie(cookie);
//登录成功，跳转...
RequestDispatcher dispatcher = request.getRequestDispatcher("/FindServlet");
dispatcher.forward(request,response);
}else{
out.print("登录失败");
out.print("
重新登陆");
// response.setContentType("text/html;charset=UTF-8");
//
// response.setHeader("refresh", "0; url=/StudentSelect");
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void init()throws ServletException {
}
}
FindServlet.java 选课主页
package xxm.servlet;
import java.io.IOException;
import java.sql.Connection;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import xxm.bean.Course;
import xxm.database.DBOper;
/**
* 主页显示信息的Servlet
*
* @author xxm
*
*/
@WebServlet("/FindServlet")
public class FindServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public FindServlet() {
super();
// TODO Auto-generated constructor stub
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
process(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
process(req, resp);
}
public void process(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
try {
// 创建Connection连接
DBOper dao = new DBOper();
Connection conn = dao.getConnection();
// SQL语句
String sql = "select * from course";
// 获取Statement
Statement statement = conn.createStatement();
ResultSet resultSet = statement.executeQuery(sql);
List courseList = new ArrayList();
while (resultSet.next()) {
Course course = new Course();
course.setCourseId(resultSet.getInt("course_Id"));
course.setCourseName(resultSet.getString("course_Name"));
course.setCourseRemain(resultSet.getInt("course_Remain"));
course.setCourseTotal(resultSet.getInt("course_Total"));
course.setCourseTeacher(resultSet.getString("course_Teacher"));
course.setCoursePlace(resultSet.getString("course_Place"));
course.setCourseTime(resultSet.getString("course_Time"));
course.setCourseTimelength(resultSet.getString("course_Timelength"));
courseList.add(course);
}
req.setAttribute("courseList", courseList);
resultSet.close();
statement.close();
conn.close();
} catch (Exception e) {
e.printStackTrace();
}
req.getRequestDispatcher("/studentIndex.jsp").forward(req, resp);
}
}
StudentInfoServlets.java 学生已选课程
package xxm.servlet;
import java.io.IOException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import xxm.bean.Course;
import xxm.bean.Student;
import xxm.database.DBOper;
/**
* Servlet implementation class StudentInfoServlets
*/
@WebServlet("/StudentInfoServlets")
public class StudentInfoServlets extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public StudentInfoServlets() {
super();
// TODO Auto-generated constructor stub
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
process(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
process(req, resp);
}
protected void process(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
try {
Connection conn = (new DBOper()).getConnection();
Statement statement = (Statement) conn.createStatement();
String numSession = (String) req.getSession().getAttribute("numSession");
String sql1 = "select * from student where sno = " + numSession;
ResultSet resultSet = statement.executeQuery(sql1);
List courseStudentList = new ArrayList();
while (resultSet.next()) {
Student student = new Student();
student.setSelectedCourse(resultSet.getString("selected_course"));
//将学生加入到课程列表
courseStudentList.add(student);
}
String courseStudentString= courseStudentList.get(0).getSelectedCourse();
String[] array = courseStudentString.split(",");
List studentCourseList = new ArrayList();
for (String s:array) {
String sql2 = "select * from course where course_Id = " + s ;
resultSet = statement.executeQuery(sql2);
while (resultSet.next()) {
Course course = new Course();
course.setCourseId(resultSet.getInt("course_Id"));
course.setCourseName(resultSet.getString("course_Name"));
course.setCourseTeacher(resultSet.getString("course_Teacher"));
course.setCoursePlace(resultSet.getString("course_Place"));
course.setCourseTime(resultSet.getString("course_Time"));
course.setCourseTimelength(resultSet.getString("course_Timelength"));
//将课程加入学生课程列表
studentCourseList.add(course);
}
}
req.setAttribute("studentCourseList", studentCourseList);
resultSet.close();
statement.close();
conn.close();
} catch (Exception e) {
e.printStackTrace();
}
resp.setCharacterEncoding("UTF-8");
req.getRequestDispatcher("studentInfo.jsp").forward(req, resp);
}
}
RemainAddServlet.java 剩余可选数
package xxm.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import xxm.database.DBOper;
/**
* Servlet implementation class RemainAddServlet
*/
@WebServlet("/RemainAddServlet")
public class RemainAddServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
process(req, resp);
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
process(req, resp);
}
protected void process(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
try {
DBOper db = new DBOper();
Connection conn = db.getConnection();
Statement statement = (Statement) conn.createStatement();
//String keyString = new String(req.getParameter("id").getBytes("iso-8859-1"), "utf-8");
req.setCharacterEncoding("UTF-8");
//课程号
String keyString = req.getParameter("id");
if(keyString == null) {
keyString = "";
resp.sendRedirect("/FindServlet");
return;
}
//添加课程,只能选一门课程
String numSession = (String) req.getSession().getAttribute("numSession");
String sql1 = "select selected_course from student where sno = " + numSession;
ResultSet resultSet = statement.executeQuery(sql1);
String course = "";
while (resultSet.next()) {
course = resultSet.getString("selected_course");
}
//还没有选课
if(course==null||course.length()==0) {
//修改课程数据
String sql2 = "update student set selected_course=\'" + keyString + "\' where sno = " + numSession;
statement.executeUpdate(sql2);
//课程余量-1
String sql = "update course set course_Remain=course_Remain-1 where course_Id = \'"+ keyString + "\'";
statement.executeUpdate(sql);
}else {
PrintWriter pw = resp.getWriter();
pw.println("重复选课
");
}
statement.close();
conn.close();
} catch (Exception e) {
e.printStackTrace();
}
resp.getWriter().print("{\"data\":\"返回json数据！\"}");
}
}
CancelServlet.java 取消选课
package xxm.servlet;
import java.io.IOException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import xxm.database.DBOper;
/**
* 取消选课
*/
@WebServlet("/CancelServlet")
public class CancelServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public CancelServlet() {
super();
// TODO Auto-generated constructor stub
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
process(req, resp);
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
process(req, resp);
}
protected void process(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
try {
Connection conn = (new DBOper()).getConnection();
Statement statement = (Statement) conn.createStatement();
//String keyString = new String(req.getParameter("id").getBytes("iso-8859-1"), "utf-8");
req.setCharacterEncoding("UTF-8");
String course = req.getParameter("id");
if(course == null) {
course = "";
resp.sendRedirect("/FindServlet");
return;
}
String numSession = (String) req.getSession().getAttribute("numSession");
// String sql1 = "select selected_course from student where sno = '" + numSession + "'";
// ResultSet resultSet = statement.executeQuery(sql1);
//取出课程字符串
// String courseString = "";
// while (resultSet.next()) {
// courseString = resultSet.getString("selected_course");
// }
//找到课程id
// Integer spot = ;
// courseString = courseString.substring(0, spot) + courseString.substring(spot+2);
//更新课程数据,取消
String sql2 = "update student set selected_course=NULL where sno = " + numSession ;
statement.executeUpdate(sql2);
//课程余量+1
String sql3 = "update course set course_Remain=course_Remain+1 where course_Id ="+ course;
statement.executeUpdate(sql3);
statement.close();
conn.close();
} catch (Exception e) {
e.printStackTrace();
}
resp.getWriter().print("{\"data\":\"返回json数据！\"}");
}
}
管理员操作部分
FindCourseServlet.java 管理员主页展示
package xxm.servlet;
import java.io.IOException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import xxm.bean.Course;
import xxm.database.DBOper;
/**
* 显示课程信息
*
* @author xxm
*
*/
@WebServlet("/FindCourseServlet")
public class FindCourseServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public FindCourseServlet() {
super();
// TODO Auto-generated constructor stub
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
process(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
process(req, resp);
}
public void process(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try {
// 创建Connection连接
DBOper dao = new DBOper();
Connection conn = dao.getConnection();
// SQL语句
String sql = "select * from course";
// 获取Statement
Statement statement = conn.createStatement();
ResultSet resultSet = statement.executeQuery(sql);
List courseLists = new ArrayList();
while (resultSet.next()) {
Course course = new Course();
course.setCourseId(resultSet.getInt("course_Id"));
course.setCourseName(resultSet.getString("course_Name"));
course.setCourseRemain(resultSet.getInt("course_Remain"));
course.setCourseTotal(resultSet.getInt("course_Total"));
course.setCourseTeacher(resultSet.getString("course_Teacher"));
course.setCoursePlace(resultSet.getString("course_Place"));
course.setCourseTime(resultSet.getString("course_Time"));
course.setCourseTimelength(resultSet.getString("course_Timelength"));
courseLists.add(course);
}
request.setAttribute("courseList", courseLists);
resultSet.close();
statement.close();
conn.close();
} catch (Exception e) {
e.printStackTrace();
}
request.getRequestDispatcher("adminCourse.jsp").forward(request, response);
}
}
CreateCourseServlet.java 添加新的课程
package xxm.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import xxm.bean.Course;
import xxm.bean.Student;
import xxm.dao.CourseDao;
import xxm.dao.StudentDao;
/**
* 创建课程，管理员
*
* @author xxm
*
*/
@WebServlet("/CreateCourseServlet")
public class CreateCourseServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public CreateCourseServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doPost(request,response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset = utf-8");
String cName = request.getParameter("cName");
String cTeacher = request.getParameter("cTeacher");
String cPlace = request.getParameter("cPlace");
String cTime = request.getParameter("cTime");
String cLong = request.getParameter("cLong");
int cTotal = Integer.parseInt(request.getParameter("cTotal"));
int cRemain = Integer.parseInt(request.getParameter("cRemain"));
PrintWriter out = response.getWriter();
//设置属性
Course course = new Course();
course.setCourseName(cName);
course.setCourseTeacher(cTeacher);
course.setCoursePlace(cPlace);
course.setCourseTime(cTime);
course.setCourseTimelength(cLong);
course.setCourseTotal(cTotal);
course.setCourseRemain(cRemain);
//添加到数据库
CourseDao dao = new CourseDao();
try {
Connection conn = dao.getConnection();
if(conn!=null) {
out.print("conn is not null");
}
if(dao.addCourse(course)){
out.print("添加成功！");
System.out.println("成功！");
response.sendRedirect("/xxmtest6/FindCourseServlet");
}
else{
out.print("添加失败！");
System.out.println("失败！");
response.sendRedirect("/xxmtest6/FindCourseServlet");
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
CancelCourse.java 删除课程
package xxm.servlet;
import java.io.IOException;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import xxm.dao.CourseDao;
/**
* 删除课程
* @author Administrator
*
*/
@WebServlet("/CancelCourse")
public class CancelCourse extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public CancelCourse() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
request.setCharacterEncoding("UTF-8");
String courseId = request.getParameter("newNo");
//删除数据
CourseDao dao = new CourseDao();
try {
Connection conn = dao.getConnection();
String sql = "delete from course where course_Id = " + courseId;
Statement statement = (Statement) conn.createStatement();
if(courseId == null) {
courseId = "";
response.sendRedirect("/xxmtest6/FindCourseServlet");
return;
}
response.sendRedirect("/xxmtest6/FindCourseServlet");
statement.executeUpdate(sql);
statement.close();
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
AdminCourseServlet.java 修改课程信息
package xxm.servlet;
import java.io.IOException;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import xxm.bean.Course;
import xxm.dao.CourseDao;
/**
* 修改课程数据
*
* @author xxm
*
*/
@WebServlet("/AdminCourseServlet")
public class AdminCourseServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public AdminCourseServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
request.setCharacterEncoding("UTF-8");
int cid = Integer.parseInt(request.getParameter("newNo"));
String cteach = request.getParameter("ccTeacher");
String cname = request.getParameter("ccName");
String cplace = request.getParameter("ccPlace");
String ctime = request.getParameter("ccTime");
String clong = request.getParameter("ccLong");
int ctotal= Integer.parseInt(request.getParameter("ccTotal"));
int cremain = Integer.parseInt(request.getParameter("ccRemain"));
System.out.printf("%d,%s,%s,%s,%s,%s,%d,%d\n",cid,cteach,cplace,cname,ctime,clong,ctotal,cremain);
System.out.println("===========");
//设置属性
Course course = new Course();
course.setCourseId(cid);
course.setCourseName(cname);
course.setCourseTeacher(cteach);
course.setCoursePlace(cplace);
course.setCourseTime(ctime);
course.setCourseTimelength(clong);
course.setCourseTotal(ctotal);
course.setCourseRemain(cremain);
//修改数据
CourseDao dao = new CourseDao();
try {
Connection conn = dao.getConnection();
if(dao.update(course)) {
System.out.println("修改成功！");
}else {
System.out.println("修改失败！");
}
conn.close();
response.sendRedirect("/xxmtest6/FindCourseServlet");
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
工程已上传到链接描述