javaweb课程信息管理系统
1、DBUtil包连接数据库
2、Bin包设计成员函数及方法
3、Dao包设计sql语句
4、servlet包增删改查方法
5、service连接servlet
6、设计jsp增删改查页面
7、连接各个页面
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 util.Util; import bin.Course; /**
* 课程Dao
* Dao层操作数据
* @author YP
*/
public class CourseDao {
/**
* 添加
* @param course
* @return
*/
public boolean add(Course course) {
String sql = "insert into course(name, teach, local) values('" + course.getName() + "','" + course.getTeach() + "','" + course.getLocal() + "')";
//创建数据库链接
Connection conn = Util.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
Util.close(state, conn);
}
if (a > 0) {
f = true;
}
return f;
}
/**
* 删除
*
* @param id
* @return
*/
public boolean delete (int id) {
boolean f = false;
String sql = "delete from course where id='" + id + "'";
Connection conn = Util.getConn();
Statement state = null;
int a = 0;
try {
state = conn.createStatement();
a = state.executeUpdate(sql);
} catch (SQLException e) {
e.printStackTrace();
} finally {
Util.close(state, conn);
}
if (a > 0) {
f = true;
}
return f;
}
/**
* 修改
* @param name
* @param pass
*/
public boolean update(Course course) {
String sql = "update course set name='" + course.getName() + "', teach='" + course.getTeach() + "', local='" + course.getLocal()
+ "' where id='" + course.getId() + "'";
Connection conn = Util.getConn();
Statement state = null;
boolean f = false;
int a = 0;
try {
state = conn.createStatement();
a = state.executeUpdate(sql);
} catch (SQLException e) {
e.printStackTrace();
} finally {
Util.close(state, conn);
}
if (a > 0) {
f = true;
}
return f;
}
/**
* 验证课程名称是否唯一
* true --- 不唯一
* @param name
* @return
*/
public boolean name(String name) {
boolean flag = false;
String sql = "select name from course where name = '" + name + "'";
Connection conn = Util.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 {
Util.close(rs, state, conn);
}
return flag;
}
/**
* 通过ID得到课程信息
* @param id
* @return
*/
public Course getCourseById(int id) {
String sql = "select * from course where id ='" + id + "'";
Connection conn = Util.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 teach = rs.getString("teach");
String local = rs.getString("local");
course = new Course(id, name, teach, local);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
Util.close(rs, state, conn);
}
return course;
}
/**
* 通过name得到Course
* @param name
* @return
*/
public Course getCourseByName(String name) {
String sql = "select * from course where name ='" + name + "'";
Connection conn = Util.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 teach = rs.getString("teach");
String local = rs.getString("local");
course = new Course(id, name, teach, local);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
Util.close(rs, state, conn);
}
return course;
}
/**
* 查找
* @param name
* @param teach
* @param local
* @return
*/
public List<Course> find(String name, String teach, String local) {
String sql = "select * from course where ";
if (name != "") {
sql += "name like '%" + name + "%'";
}
if (teach != "") {
sql += "teach like '%" + teach + "%'";
}
if (local != "") {
sql += "local like '%" + local + "%'";
}
List<Course> list = new ArrayList<>();
Connection conn = Util.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 teach2 = rs.getString("teach");
String local2 = rs.getString("local");
bean = new Course(id, name2, teach2, local2);
list.add(bean);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
Util.close(rs, state, conn);
}
return list;
}
/**
* 全部数据
* @param name
* @param teach
* @param local
* @return
*/
public List<Course> list() {
String sql = "select * from course";
List<Course> list = new ArrayList<>();
Connection conn = Util.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 teach2 = rs.getString("teach");
String local2 = rs.getString("local");
bean = new Course(id, name2, teach2, local2);
list.add(bean);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
Util.close(rs, state, conn);
}
return list;
}
}
package serverlet; import java.io.IOException;
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 bin.Course;
import service.Service; @WebServlet("/CourseServlet")
public class CourseServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
Service service = new Service();
/**
* 方法选择
*/
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.setCharacterEncoding("utf-8");
String method = req.getParameter("method");
if ("add".equals(method)) {
add(req, resp);
} else if ("delete".equals(method)) {
delete(req, resp);
} else if ("update".equals(method)) {
update(req, resp);
} else if ("find".equals(method)) {
find(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*/
private void add(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException {
req.setCharacterEncoding("utf-8");
//获取数据
String name = req.getParameter("name");
String teach = req.getParameter("teach");
String local = req.getParameter("local");
Course course = new Course(name, teach, local);
//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*/
private void list(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
req.setCharacterEncoding("utf-8");
List<Course> courses = service.list();
req.setAttribute("courses", courses);
req.getRequestDispatcher("list.jsp").forward(req,resp);
}
/**
* 通过ID得到Course
* @param req
* @param resp
* @throws ServletException
*/
private void getCourseById(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
req.setCharacterEncoding("utf-8");
int id = Integer.parseInt(req.getParameter("id"));
Course course = service.getCourseById(id);
req.setAttribute("course", course);
req.getRequestDispatcher("update.jsp").forward(req,resp);
}
/**
* 通过名字查找
* 跳转至删除*/
private void getCourseByName(HttpServletRequest req, HttpServletResponse resp) throws IOException, 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("delete.jsp").forward(req,resp);
} else {
req.setAttribute("course", course);
req.getRequestDispatcher("deletelist.jsp").forward(req,resp);
}
}
/**
* 删除*/
private void delete(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
req.setCharacterEncoding("utf-8");
int id = Integer.parseInt(req.getParameter("id"));
service.delete(id);
req.setAttribute("message", "删除成功！");
req.getRequestDispatcher("delete.jsp").forward(req,resp);
}
/**
* 修改*/
private void update(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
req.setCharacterEncoding("utf-8");
int id = Integer.parseInt(req.getParameter("id"));
String name = req.getParameter("name");
String teach = req.getParameter("teach");
String local = req.getParameter("local");
Course course = new Course(id, name, teach, local);
service.update(course);
req.setAttribute("message", "修改成功");
req.getRequestDispatcher("CourseServlet?method=list").forward(req,resp);
}
/**
* 查找
* @param req
* @param resp
* @throws ServletException
*/
private void find(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
req.setCharacterEncoding("utf-8");
String name = req.getParameter("name");
String teach = req.getParameter("teach");
String local = req.getParameter("local");
List<Course> courses = service.find(name, teach, local);
req.setAttribute("courses", courses);
req.getRequestDispatcher("findlist.jsp").forward(req,resp);
}
}
package service; import java.util.List; import dao.CourseDao;
import bin.Course; /**
* CourseService
* 服务层
* @author YP
*
*/
public class Service {
CourseDao cDao = new CourseDao();
/**
* 添加
*/
public boolean add(Course course) {
boolean f = false;
if(!cDao.name(course.getName())) {
cDao.add(course);
f = true;
}
return f;
}
/**
* 删除
*/
public void delete(int id) {
cDao.delete(id);
}
/**
* 修改
*/
public void update(Course course) {
cDao.update(course);
}
/**
* 通过ID得到一个Course
* @return
*/
public Course getCourseById(int id) {
return cDao.getCourseById(id);
}
/**
* 通过Name得到Course
*/
public Course getCourseByName(String name) {
return cDao.getCourseByName(name);
}
/**
* 查找
*/
public List<Course> find(String name, String teacher, String classroom) {
return cDao.find(name, teacher, classroom);
}
/**
* 全部数据
*/
public List<Course> list() {
return cDao.list();
}
}
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>新增课程</title>
</head>
<body>
<%
Object message = request.getAttribute("message");
if(message!=null && !"".equals(message)){
%>
<script type="text/javascript">
alert("<%=request.getAttribute("message")%>");
</script>
<%} %>
<div align="center">
<h1 style="color: black;">课程信息录入</h1>
<a href="main.jsp">返回主页</a>
<form action="CourseServlet?method=add" method="post" onsubmit="return check()">
<div class="a">
课程名称<input type="text" id="name" name="name"/>
</div>
<div class="a">
任课教师<input type="text" id="teach" name="teach" />
</div>
<div class="a">
上课地点<input type="text" id="local" name="local" />
</div>
<div class="a">
<button type="submit" class="b">保 存</button>
</div>
</form>
</div>
<script type="text/javascript">
function check() {
var name = document.getElementById("name");;
var teach = document.getElementById("teach");
var local = document.getElementById("local");
//非空
if(name.value == '') {
alert('课程名称为空');
name.focus();
return false;
}
if(teach.value == '') {
alert('教师为空');
teach.focus();
return false;
}
if(local.value == '') {
alert('上课地点为空');
local.focus();
return false;
}
//教师
if(teach.value != '王建民' && teach.value != '王辉' && teach.value != '刘丹' && teach.value != '刘立嘉' && teach.value != '杨子光'){
alert('教师名称错误');
return false;
}
//教室
if(!/^基教/.test(local.value) && !/^一教/.test(local.value) && !/^二教/.test(local.value) && !/^三教/.test(local.value)) {
alert('上课地点错误');
return false;
}
}
</script>
</body>
</html>
<%@page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html >
<html>
<head>
<meta charset="UTF-8">
<title>删除查询</title>
</head>
<body>
<%
Object message = request.getAttribute("message");
if(message!=null && !"".equals(message)){ %>
<script type="text/javascript">
alert("<%=request.getAttribute("message")%>");
</script>
<%} %>
<div align="center">
<h1 style="color: black;">课程信息删除</h1>
<a href="main.jsp">返回主页</a>
<form action="CourseServlet?method=getcoursebyname" method="post" onsubmit="return check()">
<div class="a">
课程名称<input type="text" id="name" name="name"/>
</div>
<div class="a">
<button type="submit" class="b">查 找</button>
</div>
</form>
</div>
<script type="text/javascript">
function check() {
var name = document.getElementById("name");;
//非空
if(name.value == '') {
alert('课程名称为空');
name.focus();
return false;
}
}
</script>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>删除界面</title>
</head>
<body>
<div align="center">
<h1 style="color: black;">课程信息删除</h1>
<a href="main.jsp">返回主页</a>
<table class="tb">
<tr>
<td>课程名称</td>
<td>${course.name}</td>
</tr>
<tr>
<td>任课教师</td>
<td>${course.teach}</td>
</tr>
<tr>
<td>上课地点</td>
<td>${course.local}</td>
</tr>
</table>
<div class="a">
<a onclick="return check()" href="CourseServlet?method=delete&id=${course.id}">删 除</a>
</div>
</div>
<script type="text/javascript">
function check() {
if (confirm("真的要删除吗？")){
return true;
}else{
return false;
}
}
</script>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>显示</title>
</head>
<body>
<%
Object message = request.getAttribute("message");
if(message!=null && !"".equals(message)){
%>
<script type="text/javascript">
alert("<%=request.getAttribute("message")%>");
</script>
<%} %>
<div align="center">
<h1 style="color: black;">课程信息列表</h1>
<a href="main.jsp">返回主页</a>
<table class="tb">
<tr>
<td>id</td>
<td>课程名称</td>
<td>任课教师</td>
<td>上课地点</td>
<td>操作</td>
</tr>
<c:forEach items="${courses}" var="item" varStatus="status">
<tr>
<td>${item.id}</td>
<td>${item.name}</td>
<td>${item.teach}</td>
<td>${item.local}</td>
<td><a href="CourseServlet?method=getcoursebyid&id=${item.id}">修改</a></td>
</tr>
</c:forEach>
</table>
</div>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>修改课程信息页面</title>
</head>
<body>
<%
Object message = request.getAttribute("message");
if(message!=null && !"".equals(message)){
%>
<script type="text/javascript">
alert("<%=request.getAttribute("message")%>");
</script>
<%} %>
<div align="center">
<h1 style="color: black;">课程信息修改</h1>
<a href="main.jsp">返回主页</a>
<form action="CourseServlet?method=update" method="post" onsubmit="return check()">
<div class="a">
课程名称<input type="text" id="name" name="name" value="${course.name}"/>
</div>
<div class="a">
任课教师<input type="text" id="teach" name="teach" value="${course.teach}"/>
</div>
<div class="a">
上课地点<input type="text" id="local" name="local" value="${course.local}"/>
</div>
<input type="hidden" id="id" name="id" value="${course.id}"/>
<div class="a">
<button type="submit" class="b">修 改</button>
</div>
</form>
</div>
<script type="text/javascript">
function check() {
var name = document.getElementById("name");;
var teach = document.getElementById("teach");
var local = document.getElementById("local");
//非空
if(name.value == '') {
alert('课程名称为空');
name.focus();
return false;
}
if(teach.value == '') {
alert('教师为空');
teach.focus();
return false;
}
if(local.value == '') {
alert('上课地点为空');
local.focus();
return false;
}
//教师
if(teach.value != '王建民' && teach.value != '王辉' && teach.value != '刘丹' && teach.value != '刘立嘉' && teach.value != '杨子光'){
alert('教师名称错误');
return false;
}
//教室
if(!/^基教/.test(local.value) && !/^一教/.test(local.value) && !/^二教/.test(local.value) && !/^三教/.test(local.value)) {
alert('上课地点错误');
return false;
}
}
</script>
</body>
</html>
<%@page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html >
<html>
<head>
<meta charset="UTF-8">
<title>查找界面</title>
</head>
<body>
<div align="center">
<h1 style="color: black;">课程信息查询</h1>
<a href="main.jsp">返回主页</a>
<form action="CourseServlet?method=search" method="post" onsubmit="return check()">
<div class="a">
课程名称<input type="text" id="name" name="name"/>
</div>
<div class="a">
任课教师<input type="text" id="teach" name="teach" />
</div>
<div class="a">
上课地点<input type="text" id="local" name="local" />
</div>
<div class="a">
<button type="submit" class="b">查 询</button>
</div>
</form>
</div>
<script type="text/javascript">
function check() {
var name = document.getElementById("name");
var teach = document.getElementById("teach");
var local = document.getElementById("local");
//非空
if(name.value == '' && teach.value == '' && local.value == '') {
alert('请填写一个条件');
return false;
}
}
</script>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>查询结果</title>
</head>
<body>
<div align="center">
<h1 style="color: black;">课程信息列表</h1>
<a href="main.jsp">返回主页</a>
<table class="tb">
<tr>
<td>id</td>
<td>课程名称</td>
<td>任课教师</td>
<td>上课地点</td>
</tr>
<!-- forEach遍历出adminBeans -->
<c:forEach items="${courses}" var="item" varStatus="status">
<tr>
<td>${item.id}</td>
<td>${item.name}</td>
<td>${item.teach}</td>
<td>${item.local}</td>
</tr>
</c:forEach>
</table>
</div>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html >
<html>
<head>
<meta charset="UTF-8">
<title>首页</title>
</head>
<body>
<h1 style="font-family:宋体;font-size:1.5em; width:550px" align="right">课程信息管理系统</h1>
<div align="center">
<div class="a">
<a href="add.jsp">课程信息添加</a>
</div>
<div class="a">
<a href="CourseServlet?method=list">课程信息修改</a>
</div>
<div class="a">
<a href="delete.jsp">课程信息删除</a>
</div>
<div class="a">
<a href="find.jsp">课程信息查询</a>
</div>
</div>
</body>
</html>
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