公司授课管理系统

/* 时间：2020/12/7 19：27开始
*
*
* */
package dao;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import java.util.*;

import DBUtil.DBUtil;
import domain.User;

public class myDao {

/**
* ���
* @param course
* @return
*/
public boolean manager_longin(User course) {
String sql = "insert into longin(ID,name,password,type) values('"+ course.getID() + "','"+ course.getName() +"','"+ course.getPassword()+ "','" + course.getType() + "')";
Connection conn = DBUtil.getConn();
Statement state = null;
boolean f = false;
int a = 1;

try {
state = conn.createStatement();
state.executeUpdate(sql);
} catch (Exception e) {
e.printStackTrace();
a=0;
} finally {
DBUtil.close(state, conn);
}

if (a > 0) {
f = true;
}
return f;
}
public boolean delete(String x) {
String sql = "delete from longin where ID='"+x+"'";
Connection conn = DBUtil.getConn();
Statement state = null;
boolean f = false;
int a = 1;
try {
state = conn.createStatement();
state.executeUpdate(sql);
} catch (Exception e) {
e.printStackTrace();
a=0;
} finally {
DBUtil.close(state, conn);
}

if (a > 0) {
f = true;
}
return f;
}
public static List<User> list(){//查询所有方法
String sql="select * from longin order by ID ASC";
Connection conn=DBUtil.getConn();
Statement st=null;
List<User> list=new ArrayList<>();
ResultSet rs=null;
User bean=null;
try {
st=conn.createStatement();
st.executeQuery(sql);
rs=st.executeQuery(sql);
while(rs.next()) {
String ID=rs.getString("ID");
String name = rs.getString("name");
String type = rs.getString("type");
String password=rs.getString("password");
//System.out.println("dao内ID"+ID);
bean=new User(ID,name,password,type);
list.add(bean);
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
finally {
DBUtil.close(rs, st, conn);
}
return list;
}
public static List<User> IDlist(String str){//查询ID
String sql="select * from longin where(ID like '%"+str+"%')";
Connection conn=DBUtil.getConn();
Statement st=null;
List<User> list=new ArrayList<>();
ResultSet rs=null;
User bean=null;
try {
st=conn.createStatement();
st.executeQuery(sql);
rs=st.executeQuery(sql);
while(rs.next()) {
String ID=rs.getString("ID");
String name = rs.getString("name");
String type = rs.getString("type");
String password=rs.getString("password");
// System.out.println("dao内ID"+ID);
bean=new User(ID,name,password,type);
list.add(bean);
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
finally {
DBUtil.close(rs, st, conn);
}
return list;
}
public static List<User> namelist(String str){//查询姓名
String sql="select * from longin where(name like '%"+str+"%')";
Connection conn=DBUtil.getConn();
Statement st=null;
List<User> list=new ArrayList<>();
ResultSet rs=null;
User bean=null;
try {
st=conn.createStatement();
st.executeQuery(sql);
rs=st.executeQuery(sql);
while(rs.next()) {
String ID=rs.getString("ID");
String name = rs.getString("name");
String type = rs.getString("type");
String password=rs.getString("password");
// System.out.println("dao内ID"+ID);
bean=new User(ID,name,password,type);
list.add(bean);
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
finally {
DBUtil.close(rs, st, conn);
}
return list;
}
//修改列名 alter table student change column sname stuname varchar(20);
public static boolean change_project(String oldname,String newname) {//更新方法


String sql=" alter table information change column "+oldname+" "+newname+" varchar(20) ";
//alter table 表名 add column 列名 varchar(30);
Connection conn=DBUtil.getConn();
boolean f=false;
Statement st=null;
try {
st=conn.createStatement();
st.executeUpdate(sql);
f=true;
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return f;
}
public static boolean delete_project(String x) {//更新方法


String sql="alter table information drop column "+x+" ";
//alter table 表名 add column 列名 varchar(30);
Connection conn=DBUtil.getConn();
boolean f=false;
Statement st=null;
try {
st=conn.createStatement();
st.executeUpdate(sql);
f=true;
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return f;
}
public static boolean add_project(String x) {//更新方法


String sql="alter table information add column "+x+" varchar(20)";
//alter table 表名 add column 列名 varchar(30);
Connection conn=DBUtil.getConn();
boolean f=false;
Statement st=null;
try {
st=conn.createStatement();
st.executeUpdate(sql);
f=true;
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return f;
}
public static boolean update(User bean) {//更新方法
System.out.println("开始准备更新");
String sql="update longin set ID='"+bean.getID()+"',name='"+bean.getName()+"',type='"+bean.getType()+"'where ID='"+bean.getID()+"'";
Connection conn=DBUtil.getConn();
boolean f=false;
Statement st=null;
try {
st=conn.createStatement();
st.executeUpdate(sql);
f=true;
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return f;
}
public User searchID(String x){//查询密码
String sql="select * from longin where ID='"+x+"'";
Connection conn=DBUtil.getConn();
Statement st=null;
List<User> list=new ArrayList<>();
ResultSet rs=null;
User bean=null;
try {
st=conn.createStatement();

rs=st.executeQuery(sql);
rs.next();
String ID=rs.getString("ID");
String name = rs.getString("name");
String password = rs.getString("password");
String type=rs.getString("type");

System.out.println("数据库密码"+password);
bean=new User(ID,name,password,type);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
finally {
DBUtil.close(rs, st, conn);
}
return bean;
}

}

package DBUtil;

import java.sql.*;

public class DBUtil {

public static String db_url = "jdbc:mysql://localhost:3306/company?serverTimezone=GMT%2B8&useSSL=false";
public static String db_user = "root";
public static String db_pass = "1669268823";

public static Connection getConn () {
Connection conn = null;

try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection(db_url, db_user, db_pass);
} catch (Exception e) {
e.printStackTrace();
}
System.out.println("Hollow Tomcent");

return conn;
}//end getConn

public static void close (Statement state, Connection conn) {
if (state != null) {
try {
state.close();
} catch (SQLException e) {
e.printStackTrace();
}
}

if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}

public static void close (ResultSet rs, Statement state, Connection conn) {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}

if (state != null) {
try {
state.close();
} catch (SQLException e) {
e.printStackTrace();
}
}

if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}

public static void main(String[] args) throws SQLException {
Connection conn = getConn();
PreparedStatement pstmt = null;
ResultSet rs = null;
String sql ="select * from longin";
pstmt = conn.prepareStatement(sql);
rs = pstmt.executeQuery();
if(rs.next()){
System.out.println("连接成功");
}else{
System.out.println("连接失败");
}
}
}

package domain;

public class User {

private String ID;
private String name;
private String password;
private String type;
public String getID() {
return ID;
}
public void setID(String iD) {
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;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
@Override
public String toString() {
return "User [ID=" + ID + ", name=" + name + ", password=" + password + ", type=" + type + "]";
}
public User(String iD, String name, String password, String type) {
super();
ID = iD;
this.name = name;
this.password = password;
this.type = type;
}

}

package servlet;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.text.SimpleDateFormat;
import java.io.IOException;
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 javax.servlet.http.HttpSession;

import dao.myDao;
import domain.User;

/**
* Servlet implementation class AddServlet
*/
@WebServlet("/addServlet")
public class doServlet extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#HttpServlet()
*/
public doServlet() {
super();
// TODO Auto-generated constructor stub
}

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void manager_longin(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub

request.setCharacterEncoding("utf-8");
String ID =request.getParameter("ID");
String password =request.getParameter("password");
String name = request.getParameter("name");
String type =request.getParameter("type");
System.out.println("学号是"+ID+"姓名"+name+"密码"+password+"类型"+type);
User user = new User(ID,name,password,type);
myDao cd = new myDao();
if(cd.manager_longin(user)) {
request.setAttribute("message","成功");
request.getRequestDispatcher("manager_login.jsp").forward(request,response);
}
else
{
request.setAttribute("message","失败");
request.getRequestDispatcher("manager_login.jsp").forward(request,response);
}

}
private void list(HttpServletRequest request, HttpServletResponse response) throws Exception {
// TODO Auto-generated method stub
request.setCharacterEncoding("utf-8");
HttpSession session = request.getSession();
String ID=(String)session.getAttribute("ID");
System.out.println("存入的ID为"+ID);
String cxfs=request.getParameter("cxfs");
String value=request.getParameter("value");
System.out.println("cxfs为"+cxfs+"value"+value);
if(cxfs.equals(""))
{
List<User> list=myDao.list();
System.out.println(list.toString());
request.setAttribute("list", list);
}
else if(cxfs.equals("ID"))
{
List<User> list=myDao.IDlist(value);
request.setAttribute("list", list);
}
else if(cxfs.equals("姓名"))
{
List<User> list=myDao.namelist(value);
request.setAttribute("list", list);
}
request.getRequestDispatcher("list.jsp").forward(request,response);
}
private void searchMyInformation(HttpServletRequest request, HttpServletResponse response) throws Exception {
// TODO Auto-generated method stub
request.setCharacterEncoding("utf-8");
HttpSession session = request.getSession();
String ID=(String)session.getAttribute("ID");
String myType=(String)session.getAttribute("type");
System.out.println("存入的ID为"+ID);
myDao cd = new myDao();
User user = cd.searchID(ID);
List<User> list=new ArrayList<>();
list.add(user);
request.setAttribute("list", list);

System.out.println("成功");
request.getRequestDispatcher("list_information.jsp").forward(request,response);

}
private void back(HttpServletRequest request, HttpServletResponse response) throws Exception {
// TODO Auto-generated method stub
request.setCharacterEncoding("utf-8");
HttpSession session = request.getSession();

String myType=(String)session.getAttribute("type");
System.out.println("type为"+myType);
request.setAttribute("message","返回主页");
if(myType.equals("1.员工"))
request.getRequestDispatcher("person.jsp").forward(request,response);
else if(myType.equals("2.教师"))
request.getRequestDispatcher("tercher.jsp").forward(request,response);
else
request.getRequestDispatcher("manager.jsp").forward(request,response);
}

private void update(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
request.setCharacterEncoding("utf-8");
String ID = request.getParameter("ID");
String name = request.getParameter("name");
String password = request.getParameter("password");
String type = request.getParameter("type");
User bean=new User(ID,name,password,type);
System.out.println("ID"+ID+"姓名"+name);
if(myDao.update(bean))
{
request.setAttribute("message", "修改成功");
if(type.equals("1.员工"))
{
if(type.equals("1.员工"))
request.getRequestDispatcher("person.jsp").forward(request,response);
else if(type.equals("2.教师"))
request.getRequestDispatcher("tercher.jsp").forward(request,response);
else
request.getRequestDispatcher("manager.jsp").forward(request,response);
}
}
else
{
request.setAttribute("message", "修改失败");
if(type.equals("1.员工"))
request.getRequestDispatcher("person.jsp").forward(request,response);
else if(type.equals("2.教师"))
request.getRequestDispatcher("tercher.jsp").forward(request,response);
else
request.getRequestDispatcher("manager.jsp").forward(request,response);
}

}
private void searchID(HttpServletRequest request, HttpServletResponse response) throws Exception {
// TODO Auto-generated method stub
request.setCharacterEncoding("utf-8");
HttpSession session = request.getSession();
String ID =request.getParameter("ID");
String mypassword =request.getParameter("password");
String myType=request.getParameter("type");
session.setAttribute("ID", ID);
session.setAttribute("type", myType);
System.out.println(ID+" "+mypassword);
myDao cd = new myDao();
User list = cd.searchID(ID);
String rightPassword = list.getPassword();
System.out.println(rightPassword);
if(mypassword.equals(rightPassword)&&myType.equals(list.getType()))
{
request.setAttribute("message","密码正确");
if(myType.equals("1.员工"))
request.getRequestDispatcher("person.jsp").forward(request,response);
else if(myType.equals("2.教师"))
request.getRequestDispatcher("tercher.jsp").forward(request,response);
else
request.getRequestDispatcher("manager.jsp").forward(request,response);
}

else
{
request.setAttribute("message","密码错误或身份错误");
request.getRequestDispatcher("login.jsp").forward(request,response);
}
}
private void add_project(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
String project=request.getParameter("project");
System.out.println("添加的课程为"+project);
myDao cd=new myDao();
if(cd.add_project(project))
{
request.setAttribute("message", "添加成功");
request.getRequestDispatcher("manager.jsp").forward(request, response);
}
else
{
request.setAttribute("message", "添加失败");
request.getRequestDispatcher("addProject.jsp").forward(request, response);
}
}
private void change_project(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
String oldname=request.getParameter("oldname");
String newname=request.getParameter("newname");
System.out.println("修改课程"+oldname+"为"+newname);
myDao cd=new myDao();
if(cd.change_project(oldname,newname))
{
request.setAttribute("message", "修改成功");
request.getRequestDispatcher("manager.jsp").forward(request, response);
}
else
{
request.setAttribute("message", "修改失败");
request.getRequestDispatcher("change_project.jsp").forward(request, response);
}
}
private void delete_project(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
String project=request.getParameter("project");

System.out.println("删除课程"+project);
myDao cd=new myDao();
if(cd.delete_project(project))
{
request.setAttribute("message", "删除成功");
request.getRequestDispatcher("manager.jsp").forward(request, response);
}
else
{
request.setAttribute("message", "删除失败");
request.getRequestDispatcher("change_project.jsp").forward(request, response);
}
}
private void delete(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
String ID=request.getParameter("ID");
System.out.println("删除ID"+ID);
myDao cd=new myDao();
if(cd.delete(ID))
{
request.setAttribute("message", "删除成功");
request.getRequestDispatcher("list.jsp").forward(request, response);
}
else
{
request.setAttribute("message", "删除失败");
request.getRequestDispatcher("list.jsp").forward(request, response);
}

}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
request.setCharacterEncoding("utf-8");
HttpSession session = request.getSession();
String method =request.getParameter("method");
if(method.equals("manager_login"))
{
manager_longin(request, response);
}
else if(method.equals("login"))
{
try {
searchID(request,response);
} catch (Exception e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}
}
else if(method.equals("update"))
{
try {
update(request,response);
} catch (Exception e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}
}
else if(method.equals("list"))
{
try {
list(request,response);
} catch (Exception e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}
}
else if(method.equals("searchMyInformation"))
{
try {
searchMyInformation(request,response);
} catch (Exception e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}
}
else if(method.equals("back"))
{
try {
back(request,response);
} catch (Exception e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}
}
else if(method.equals("delete"))
{
try {
delete(request,response);
} catch (Exception e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}
}
else if(method.equals("add_project"))
{
try {
add_project(request,response);
} catch (Exception e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}
}

}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doPost(request, response);

}

}