开发基于Mysql、Servlet、JSP的作业管理系统；

实现功能：
老师：添加作业，添加学生。查询学生作业；
学生：根据老师添加的作业，进行作业提交；
简要思路实现：

首先先用Mysql对数据库进行设计；
然后创建JAVAEE WEB项目，通过JDBC连接数据库并编写Dao层对数据库进行操作；
接下来编写servlet提供服务器接口；
最后编写JSP提供网页端可视化管理。
#

步骤

1.数据库设计（利用powerdesigner设计）

teacher表：包括老师id,老师姓名以及密码
student表：包括学生id,学生姓名，学生密码
homework表：包括作业id,作业名称，作业内容，截止日期
**assign表：**包括老师创建作业的时间
submit表：包括学生提交作业时间，提交内容，学生作业状态（提交为1，未提交为0)

mysql语句：

create table assign
(
hid int not null,
tid int not null,
create_time datetime,
primary key (hid, tid)
);

create table homework
(
hid int not null,
title varchar(50),
acquirement varchar(500),
deadline datetime,
primary key (hid)
);

create table student
(
sid int not null,
sname char(10) not null,
spassword varchar(8),
primary key (sid)
);

create table submit
(
hid int not null,
sid int not null,
submit_time datetime,
content varchar(1000),
status int,
primary key (hid, sid)
);

create table teacher
(
tid int not null,
tname char(10) not null,
tpassword varchar(8),
primary key (tid)
);

alter table assign add constraint FK_about foreign key (hid)
references homework (hid) on delete restrict on update restrict;

alter table assign add constraint FK_design foreign key (tid)
references teacher (tid) on delete restrict on update restrict;

alter table submit add constraint FK_get foreign key (hid)
references homework (hid) on delete restrict on update restrict;

alter table submit add constraint FK_sub foreign key (sid)
references student (sid) on delete restrict on update restrict;

2.创建javaee项目

建立项目详见笔记1
新建项目并且按照如图所示设置

3.部分源码

homework.java

 package db;public class homework {public static final int SUBMIT_STATUS_DOING = 0;public static final int SUBMIT_STATUS_SUBMITTED = 1;private int id;private String title;private String requirement;private String deadline;public homework(){}public homework(int id, String title, String requirement,String deadline) {this.id = id;this.title = title;this.requirement = requirement;this.deadline=deadline;}public int getId() {return id;}public void setId(int id) {this.id = id;}public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}public String getRequirement() {return requirement;}public void setRequirement(String requirement) {this.requirement = requirement;}public String getDeadline(){ return deadline;}public void setDeadline(String deadline) {this.deadline = deadline;}}

student.java

package db;public class student {private int id;private String name;private String password;public student(){}public student(int id, String name, String password) {this.id = id;this.name = name;this.password = password;}public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}
}**teacher.java**```java
在这里插入代码片
```package db;public class teacher {private int id;private String name;private String password;public teacher(){}public int getId() {return id;}public teacher(int id, String name, String password) {this.id = id;this.name = name;this.password = password;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}
}

jdbc.java

package jdbc;import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;public class jdbc {//单实例Connectionprivate static Connection connection;//JDBC驱动名private static final String driverName = "com.mysql.cj.jdbc.Driver";//连接数据库的urlprivate static final String url = "jdbc:mysql://127.0.0.1:3306/homework?serverTimezone=UTC&useSSL=false&allowPublicKeyRetrieval=true";//数据库用户名private static final String user = "root";//数据库用户的密码private static final String password = "qq137139";//私有constructor，防止实例化private jdbc(){ }public static Connection getConnection() {if(connection == null) {try {Class.forName(driverName);connection = DriverManager.getConnection(url, user, password);} catch (ClassNotFoundException e) {e.printStackTrace();} catch (SQLException e) {e.printStackTrace();try {connection.close();} catch (SQLException e1) {e.printStackTrace();}}}return connection;}//测试获取connection是否成功public static void main(String[] args) {Connection connection = jdbc.getConnection();if (connection != null)System.out.println("连接成功");elseSystem.out.println("连接失败");}
}

servlet

public class assignservlet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {int hid = Integer.parseInt(req.getParameter("hid"));String[] studentIDs = req.getParameter("students").split(";");submitdao submitDao = new submitdao1();for (String studentId : studentIDs) {int sid = Integer.parseInt(studentId);submitDao.addSubmit(sid, hid);}req.getRequestDispatcher("/successful.jsp").forward(req, resp);}
}
public class createservlet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {int tid = Integer.parseInt(req.getParameter("tid"));String title = req.getParameter("title");String requirement = req.getParameter("requirement");homeworkdao homeworkDao = new homeworkdao1();if (homeworkDao.addHomework(title, requirement)) {int hid = homeworkDao.getHomeworkByTitle(title).getId();assigndao assignDao = new assigndao1();assignDao.assign(tid, hid);req.setAttribute("homeworkList", homeworkDao.getHomeworkOfTeacher(tid));req.getRequestDispatcher("/assign_homework.jsp").forward(req, resp);} else {req.getRequestDispatcher("/fail.jsp").forward(req, resp);}}
}
public class loginservlet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {String userType = req.getParameter("user_type");String name = req.getParameter("name");String password = req.getParameter("password");if(userType.equals("teacher")){teacherdao teacherDao = new teacherdao1();teacher teacher = teacherDao.getTeacher(name);if(password.equals(teacher.getPassword())){req.setAttribute("teacher", teacher);req.getRequestDispatcher("create_homework.jsp").forward(req, resp);}else{resp.getWriter().println("用户名或密码错误");}}else if(userType.equals("student")){studentdao studentDao = new studentdao1();student student = studentDao.getStudent(name);if(password.equals(student.getPassword())){req.setAttribute("sid", student.getId());List<homework> homeworkList = new homeworkdao1().getHomeworkOfStudent(student.getId());req.setAttribute("homeworkList", homeworkList);req.getRequestDispatcher("submit_homework.jsp").forward(req, resp);}else{resp.getWriter().println("用户名或密码错误");}}}
}public class registerservlet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {String userType = req.getParameter("user_type");String name = req.getParameter("name");String password = req.getParameter("password");if(userType.equals("teacher")){teacherdao teacherDao = new teacherdao1();if(teacherDao.addTeacher(name, password)){req.getRequestDispatcher("index.jsp").forward(req, resp);}else{resp.getWriter().println("注册失败");}}else{studentdao studentDao = new studentdao1();if(studentDao.addStudent(name, password)){req.getRequestDispatcher("index.jsp").forward(req, resp);}else{resp.getWriter().println("注册失败");}}}
}public class submitservlet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {int sid = Integer.parseInt(req.getParameter("sid"));int hid = Integer.parseInt(req.getParameter("hid"));String content = req.getParameter("content");submitdao submitDao = new submitdao1();submitDao.submit(sid, hid, content);req.getRequestDispatcher("/successful.jsp").forward(req, resp);}
}

项目源码

https://github.com/1goddness2/javaee.git

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