网站建设合作注册一个网站
一、【建立数据库】
在mysql中新建一个名为kecheng的数据库,并在其中新建一个kecheng数据表,包含三个字段,classname,classroom,teacher
二、【新建web项目】
1. eclipse新建一个名为Course的Dynamic Web Project
2. 将连接mysql的驱动jar包(mysql-connector-java-5.1.7-bin.jar)copy到WEB-INF下的lib目录下
3.新建五个包,entity存放实体类(User),dao存放数据库操作类(UserDao),servlet存放控制类(addServlet,updateServlet,deleteServlet,listServlet),util存放开发帮助类
代码:
packagecom.hjf.dao;importjava.sql.Connection;importjava.sql.ResultSet;importjava.sql.SQLException;importjava.sql.Statement;importjava.util.ArrayList;importjava.util.List;importcom.hjf.entity.Course;importcom.hjf.util.DBUtil;/*** 课程Dao
* Dao层操作数据
*@authorHu
**/
public classCourseDao {/*** 添加
*@paramcourse
*@return
*/
public booleanadd(Course course) {
String sql= "insert into course(name, teacher, classroom) values('" + course.getName() + "','" + course.getTeacher() + "','" + course.getClassroom() + "')";//创建数据库链接
Connection conn =DBUtil.getConn();
Statement state= null;boolean f = false;int a = 0;try{
state=conn.createStatement();
state.executeUpdate(sql);
}catch(Exception e) {
e.printStackTrace();
}finally{//关闭连接
DBUtil.close(state, conn);
}if (a > 0) {
f= true;
}returnf;
}/*** 删除
*
*@paramid
*@return
*/
public boolean delete (intid) {boolean f = false;
String sql= "delete from course where id='" + id + "'";
Connection conn=DBUtil.getConn();
Statement state= null;int a = 0;try{
state=conn.createStatement();
a=state.executeUpdate(sql);
}catch(SQLException e) {
e.printStackTrace();
}finally{
DBUtil.close(state, conn);
}if (a > 0) {
f= true;
}returnf;
}/*** 修改
*@paramname
*@parampass*/
public booleanupdate(Course course) {
String sql= "update course set name='" + course.getName() + "', teacher='" + course.getTeacher() + "', classroom='" +course.getClassroom()+ "' where id='" + course.getId() + "'";
Connection conn=DBUtil.getConn();
Statement state= null;boolean f = false;int a = 0;try{
state=conn.createStatement();
a=state.executeUpdate(sql);
}catch(SQLException e) {
e.printStackTrace();
}finally{
DBUtil.close(state, conn);
}if (a > 0) {
f= true;
}returnf;
}/*** 验证课程名称是否唯一
* true --- 不唯一
*@paramname
*@return
*/
public booleanname(String name) {boolean flag = false;
String sql= "select name from course where name = '" + name + "'";
Connection conn=DBUtil.getConn();
Statement state= null;
ResultSet rs= null;try{
state=conn.createStatement();
rs=state.executeQuery(sql);while(rs.next()) {
flag= true;
}
}catch(SQLException e) {
e.printStackTrace();
}finally{
DBUtil.close(rs, state, conn);
}returnflag;
}/*** 通过ID得到课程信息
*@paramid
*@return
*/
public Course getCourseById(intid) {
String sql= "select * from course where id ='" + id + "'";
Connection conn=DBUtil.getConn();
Statement state= null;
ResultSet rs= null;
Course course= null;try{
state=conn.createStatement();
rs=state.executeQuery(sql);while(rs.next()) {
String name= rs.getString("name");
String teacher= rs.getString("teacher");
String classroom= rs.getString("classroom");
course= newCourse(id, name, teacher, classroom);
}
}catch(Exception e) {
e.printStackTrace();
}finally{
DBUtil.close(rs, state, conn);
}returncourse;
}/*** 通过name得到Course
*@paramname
*@return
*/
publicCourse getCourseByName(String name) {
String sql= "select * from course where name ='" + name + "'";
Connection conn=DBUtil.getConn();
Statement state= null;
ResultSet rs= null;
Course course= null;try{
state=conn.createStatement();
rs=state.executeQuery(sql);while(rs.next()) {int id = rs.getInt("id");
String teacher= rs.getString("teacher");
String classroom= rs.getString("classroom");
course= newCourse(id, name, teacher, classroom);
}
}catch(Exception e) {
e.printStackTrace();
}finally{
DBUtil.close(rs, state, conn);
}returncourse;
}/*** 查找
*@paramname
*@paramteacher
*@paramclassroom
*@return
*/
public Listsearch(String name, String teacher, String classroom) {
String sql= "select * from course where ";if (name != "") {
sql+= "name like '%" + name + "%'";
}if (teacher != "") {
sql+= "teacher like '%" + teacher + "%'";
}if (classroom != "") {
sql+= "classroom like '%" + classroom + "%'";
}
List list = new ArrayList<>();
Connection conn=DBUtil.getConn();
Statement state= null;
ResultSet rs= null;try{
state=conn.createStatement();
rs=state.executeQuery(sql);
Course bean= null;while(rs.next()) {int id = rs.getInt("id");
String name2= rs.getString("name");
String teacher2= rs.getString("teacher");
String classroom2= rs.getString("classroom");
bean= newCourse(id, name2, teacher2, classroom2);
list.add(bean);
}
}catch(SQLException e) {
e.printStackTrace();
}finally{
DBUtil.close(rs, state, conn);
}returnlist;
}/*** 全部数据
*@paramname
*@paramteacher
*@paramclassroom
*@return
*/
public Listlist() {
String sql= "select * from course";
List list = new ArrayList<>();
Connection conn=DBUtil.getConn();
Statement state= null;
ResultSet rs= null;try{
state=conn.createStatement();
rs=state.executeQuery(sql);
Course bean= null;while(rs.next()) {int id = rs.getInt("id");
String name2= rs.getString("name");
String teacher2= rs.getString("teacher");
String classroom2= rs.getString("classroom");
bean= newCourse(id, name2, teacher2, classroom2);
list.add(bean);
}
}catch(SQLException e) {
e.printStackTrace();
}finally{
DBUtil.close(rs, state, conn);
}returnlist;
}
}
packagecom.hjf.entity;public classCourse {private intid;privateString name;privateString teacher;privateString classroom;public intgetId() {returnid;
}public void setId(intid) {this.id =id;
}publicString getName() {returnname;
}public voidsetName(String name) {this.name =name;
}publicString getTeacher() {returnteacher;
}public voidsetTeacher(String teacher) {this.teacher =teacher;
}publicString getClassroom() {returnclassroom;
}public voidsetClassroom(String classroom) {this.classroom =classroom;
}publicCourse() {}public Course(intid, String name, String teacher, String classroom) {this.id =id;this.name =name;this.teacher =teacher;this.classroom =classroom;
}publicCourse(String name, String teacher, String classroom) {this.name =name;this.teacher =teacher;this.classroom =classroom;
}
}
packagecom.hjf.service;importjava.util.List;importcom.hjf.dao.CourseDao;importcom.hjf.entity.Course;/*** CourseService
* 服务层
*@authorHu
**/
public classCourseService {
CourseDao cDao= newCourseDao();/*** 添加
*@paramcourse
*@return
*/
public booleanadd(Course course) {boolean f = false;if(!cDao.name(course.getName())) {
cDao.add(course);
f= true;
}returnf;
}/*** 删除*/
public void del(intid) {
cDao.delete(id);
}/*** 修改
*@return
*/
public voidupdate(Course course) {
cDao.update(course);
}/*** 通过ID得到一个Course
*@return
*/
public Course getCourseById(intid) {returncDao.getCourseById(id);
}/*** 通过Name得到一个Course
*@return
*/
publicCourse getCourseByName(String name) {returncDao.getCourseByName(name);
}/*** 查找
*@return
*/
public Listsearch(String name, String teacher, String classroom) {returncDao.search(name, teacher, classroom);
}/*** 全部数据
*@return
*/
public Listlist() {returncDao.list();
}
}
packagecom.hjf.servlet;importjava.io.IOException;importjava.util.List;importjavax.servlet.ServletException;importjavax.servlet.annotation.WebServlet;importjavax.servlet.http.HttpServlet;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;importcom.hjf.entity.Course;importcom.hjf.service.CourseService;
@WebServlet("/CourseServlet")public class CourseServlet extendsHttpServlet {private static final long serialVersionUID = 1L;
CourseService service= newCourseService();/*** 方法选择*/
protected void service(HttpServletRequest req, HttpServletResponse resp) throwsServletException, IOException {
req.setCharacterEncoding("utf-8");
String method= req.getParameter("method");if ("add".equals(method)) {
add(req, resp);
}else if ("del".equals(method)) {
del(req, resp);
}else if ("update".equals(method)) {
update(req, resp);
}else if ("search".equals(method)) {
search(req, resp);
}else if ("getcoursebyid".equals(method)) {
getCourseById(req, resp);
}else if ("getcoursebyname".equals(method)) {
getCourseByName(req, resp);
}else if ("list".equals(method)) {
list(req, resp);
}
}/*** 添加
*@paramreq
*@paramresp
*@throwsIOException
*@throwsServletException*/
private void add(HttpServletRequest req, HttpServletResponse resp) throwsIOException, ServletException {
req.setCharacterEncoding("utf-8");//获取数据
String name = req.getParameter("name");
String teacher= req.getParameter("teacher");
String classroom= req.getParameter("classroom");
Course course= newCourse(name, teacher, classroom);//添加后消息显示
if(service.add(course)) {
req.setAttribute("message", "添加成功");
req.getRequestDispatcher("add.jsp").forward(req,resp);
}else{
req.setAttribute("message", "课程名称重复,请重新录入");
req.getRequestDispatcher("add.jsp").forward(req,resp);
}
}/*** 全部
*@paramreq
*@paramresp
*@throwsServletException*/
private void list(HttpServletRequest req, HttpServletResponse resp) throwsIOException, ServletException{
req.setCharacterEncoding("utf-8");
List courses =service.list();
req.setAttribute("courses", courses);
req.getRequestDispatcher("list.jsp").forward(req,resp);
}/*** 通过ID得到Course
*@paramreq
*@paramresp
*@throwsServletException*/
private void getCourseById(HttpServletRequest req, HttpServletResponse resp) throwsIOException, ServletException{
req.setCharacterEncoding("utf-8");int id = Integer.parseInt(req.getParameter("id"));
Course course=service.getCourseById(id);
req.setAttribute("course", course);
req.getRequestDispatcher("detail2.jsp").forward(req,resp);
}/*** 通过名字查找
* 跳转至删除
*@paramreq
*@paramresp
*@throwsIOException
*@throwsServletException*/
private void getCourseByName(HttpServletRequest req, HttpServletResponse resp) throwsIOException, ServletException{
req.setCharacterEncoding("utf-8");
String name= req.getParameter("name");
Course course=service.getCourseByName(name);if(course == null) {
req.setAttribute("message", "查无此课程!");
req.getRequestDispatcher("del.jsp").forward(req,resp);
}else{
req.setAttribute("course", course);
req.getRequestDispatcher("detail.jsp").forward(req,resp);
}
}/*** 删除
*@paramreq
*@paramresp
*@throwsIOException
*@throwsServletException*/
private void del(HttpServletRequest req, HttpServletResponse resp) throwsIOException, ServletException{
req.setCharacterEncoding("utf-8");int id = Integer.parseInt(req.getParameter("id"));
service.del(id);
req.setAttribute("message", "删除成功!");
req.getRequestDispatcher("del.jsp").forward(req,resp);
}/*** 修改
*@paramreq
*@paramresp
*@throwsIOException
*@throwsServletException*/
private void update(HttpServletRequest req, HttpServletResponse resp) throwsIOException, ServletException{
req.setCharacterEncoding("utf-8");int id = Integer.parseInt(req.getParameter("id"));
String name= req.getParameter("name");
String teacher= req.getParameter("teacher");
String classroom= req.getParameter("classroom");
Course course= newCourse(id, name, teacher, classroom);
service.update(course);
req.setAttribute("message", "修改成功");
req.getRequestDispatcher("CourseServlet?method=list").forward(req,resp);
}/*** 查找
*@paramreq
*@paramresp
*@throwsServletException*/
private void search(HttpServletRequest req, HttpServletResponse resp) throwsIOException, ServletException{
req.setCharacterEncoding("utf-8");
String name= req.getParameter("name");
String teacher= req.getParameter("teacher");
String classroom= req.getParameter("classroom");
List courses =service.search(name, teacher, classroom);
req.setAttribute("courses", courses);
req.getRequestDispatcher("searchlist.jsp").forward(req,resp);
}
}
packagecom.hjf.util;importjava.sql.Connection;importjava.sql.DriverManager;importjava.sql.PreparedStatement;importjava.sql.ResultSet;importjava.sql.SQLException;importjava.sql.Statement;/*** 数据库连接工具
*@authorHu
**/
public classDBUtil {public static String db_url = "jdbc:mysql://localhost:3306/course?useUnicode=true&characterEncoding=utf8";public static String db_user = "root";public static String db_pass = "123";public staticConnection getConn () {
Connection conn= null;try{
Class.forName("com.mysql.jdbc.Driver");//加载驱动
conn =DriverManager.getConnection(db_url, db_user, db_pass);
}catch(Exception e) {
e.printStackTrace();
}returnconn;
}/*** 关闭连接
*@paramstate
*@paramconn*/
public static voidclose (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 voidclose (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) throwsSQLException {
Connection conn=getConn();
PreparedStatement pstmt= null;
ResultSet rs= null;
String sql="select * from course";
pstmt=conn.prepareStatement(sql);
rs=pstmt.executeQuery();if(rs.next()){
System.out.println("空");
}else{
System.out.println("不空");
}
}
}
Insert title here课程信息录入
返回主页
保 存
var name= document.getElementById("name");;
var teacher= document.getElementById("teacher");
var classroom= document.getElementById("classroom");//非空
if(name.value == '') {
alert('课程名称为空');
name.focus();return false;
}if(teacher.value == '') {
alert('教师为空');
teacher.focus();return false;
}if(classroom.value == '') {
alert('上课地点为空');
classroom.focus();return false;
}//教师
if(teacher.value != '王建民' && teacher.value != '王辉' && teacher.value != '刘丹' && teacher.value != '刘立嘉' && teacher.value != '杨子光'){
alert('教师名称错误');return false;
}//教室
if(!/^基教/.test(classroom.value) && !/^一教/.test(classroom.value) && !/^二教/.test(classroom.value) && !/^三教/.test(classroom.value)) {
alert('上课地点错误');return false;
}
}
Insert title here课程信息删除
返回主页
查 找
var name= document.getElementById("name");;//非空
if(name.value == '') {
alert('课程名称为空');
name.focus();return false;
}
}
Insert title heremargin-top: 20px;
}
.b{
font-size: 20px;
width: 160px;
color: white;
background-color: greenyellow;
}
.tb, td {
border: 1px solid black;
font-size: 22px;
}
课程信息删除
返回主页
课程名称 | ${course.name} |
任课教师 | ${course.teacher} |
上课地点 | ${course.classroom} |
删 除
}else{return false;
}
}
首页课程信息添加
课程信息修改
课程信息删除
课程信息查询
课程信息列表
返回主页
id | 课程名称 | 任课教师 | 上课地点 | 操作 | |
${item.id} | ${item.name} | ${item.teacher} | ${item.classroom} | 修改 |
课程信息查询
返回主页
查 询
var name= document.getElementById("name");;
var teacher= document.getElementById("teacher");
var classroom= document.getElementById("classroom");//非空
if(name.value == '' && teacher.value == '' && classroom.value == '') {
alert('请填写一个条件');return false;
}
}
Insert title here课程信息列表
返回主页
id | 课程名称 | 任课教师 | 上课地点 |
${item.id} | ${item.name} | ${item.teacher} | ${item.classroom} |