Hello,大家好,本周博主为大家带来一个简单的基于JavaWeb的课程管理系统,内容详细,好了,下面步入正题
技术栈:
后端:JavaWeb+MySQL
前端:bootstrap+jsp
category分类表:
CREATE TABLE `category` (
`id` int(11) NOT NULL AUTO_INCREMENT COMMENT '分类id',
`cat_name` varchar(20) NOT NULL COMMENT '分类名称',
PRIMARY KEY (`id`)
)
course课程表:
CREATE TABLE `course` (
`id` int(11) NOT NULL AUTO_INCREMENT COMMENT '课程id',
`course_name` varchar(20) NOT NULL COMMENT '课程名称',
`cat_id` int(11) NOT NULL COMMENT '所属分类的id',
`lesson_nums` int(11) DEFAULT NULL COMMENT '课程数量',
`price` decimal(7,2) DEFAULT NULL COMMENT '课程价格',
`cover_img` varchar(255) DEFAULT NULL COMMENT '课程封面图',
`buy_count` int(11) DEFAULT NULL COMMENT '课程购买的数量',
`view_count` int(11) DEFAULT NULL COMMENT '查看课程的数量',
`status` int(11) DEFAULT NULL COMMENT '课程状态:0:下架,1:上架',
PRIMARY KEY (`id`)
)
课程管理系统,可对课程分类,对课程进行增删改查操作,课程支持上传封面图,可对课程名称,价格,分类进行多条件查询,实现课程列表的分页
Java源码
前端结构
BaseServlet
该类为通用类,该类继承于HttpServlet,拦截所有请求并通过反射的方式调用方法
public class BaseServlet extends HttpServlet{
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//1. 获取请求的URI路径,如果 /user/login 如果访问 /user/register
String uri = req.getRequestURI();
//2. 获取最后 / 后面的内容, login register
String methodName = uri.substring(uri.lastIndexOf("/") + 1);
//3. 调用方法
try {
Method m = this.getClass().getMethod(methodName, HttpServletRequest.class,HttpServletResponse.class);
m.invoke(this, req,resp);
} catch (Exception e) {
e.printStackTrace();
}
}
}
RouteServlet
路由跳转类,因为所有的jsp页面都放进了/WEB-INF下,该目录下的文件只支持转发方式来访问,一是封装了跳转的方法,二是跳转时可携带数据
@WebServlet("/route/*")
public class RouteServlet extends BaseServlet{
CourseService courseService = new CourseServiceImpl();
CategoryService categoryService = new CategoryServiceImpl();
private static final Integer PAGE_SIZE = 2;
public void list(HttpServletRequest req, HttpServletResponse resp) {
try {
String courseName = req.getParameter("course_name");
String cid = req.getParameter("cid");
String min = req.getParameter("min");
String max = req.getParameter("max");
String strPageNumb = req.getParameter("pageNumb");
Integer pageNumb = 1;
if (!StringUtils.isEmpty(strPageNumb) && NumberUtils.isDigits(strPageNumb)) {
pageNumb = Integer.valueOf(strPageNumb);
}
PageInfo pager = courseService.queryList(pageNumb, PAGE_SIZE, courseName, cid, min, max);
List<Category> categoryList = categoryService.queryList();
req.setAttribute("courseName", courseName);
req.setAttribute("cid", cid);
req.setAttribute("min", min);
req.setAttribute("max", max);
req.setAttribute("categoryList", categoryList);
req.setAttribute("pager", pager);
req.getRequestDispatcher("/WEB-INF/list.jsp")
.forward(req, resp);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void add(HttpServletRequest req, HttpServletResponse resp) {
try {
List<Category> categoryList = categoryService.queryList();
req.setAttribute("categoryList", categoryList);
req.getRequestDispatcher("/WEB-INF/add.jsp")
.forward(req, resp);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void edit(HttpServletRequest req, HttpServletResponse resp) {
try {
String id = req.getParameter("id");
Course course = courseService.getById(id);
List<Category> categoryList = categoryService.queryList();
req.setAttribute("categoryList", categoryList);
req.setAttribute("course", course);
req.getRequestDispatcher("/WEB-INF/edit.jsp")
.forward(req, resp);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
FileUploadUtils
文件工具上传类,该类封装了上传文件方法
public class FileUploadUtils extends HttpServlet{
/**
* @param basePath 用户指定的上传目录
* @return 返回上传之后的文件名称
* @throws FileUploadException
*/
public static String upload(String basePath,HttpServletRequest req) throws Exception{
//1. 先上传文件,并返回上传的文件名称,便于将来通过名字找到该文件
DiskFileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload fileUpload = new ServletFileUpload(factory);
//将request请求的内容解析成List集合 {input[type=file],input[type=text],}
List<FileItem> list = fileUpload.parseRequest(req);
String dbpath = "";
for(FileItem item:list){
if(item.isFormField()){
//普通的文本框:
String fieldName = item.getFieldName(); //获取字段名 username\route_id
String fieldValue = item.getString("UTF-8");//获取字段值 张三丰
req.setAttribute(fieldName, fieldValue);
}else{
//文件上传框
//1. 获取文件输入流
InputStream input = item.getInputStream();
if(input.available() > 0){
//2. 获取文件输出流
//String basePath = "D:/uploads/";
//确定目标文件名
String destFileName = UUID.randomUUID().toString().replace("-", "");
//确定目标文件后缀:.png .jpg .gif
String originName = item.getName();
String suffix = originName.substring(originName.lastIndexOf("."));
//保存到数据库中的相对路径
dbpath = destFileName+suffix;
//如果当前文件的父级目录不存在,则创建
File destFile = new File(basePath+dbpath);
if(!destFile.getParentFile().isDirectory()){
destFile.getParentFile().mkdirs();
}
//创建文件输出流
FileOutputStream output = new FileOutputStream(destFile);
//3. 开始读写(上传、拷贝)
byte[] arr = new byte[1024];
int res = 0;
while( (res = input.read(arr)) > 0){
output.write(arr, 0, res);
}
//关闭资源
input.close();
output.close();
}
}
}
return dbpath; // 返回文件名称
}
}
前端部分代码
list.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%
request.setAttribute("APP_PATH", request.getContextPath());
%>
Document
add.jsp
注意:form表单需加 enctype=“multipart/form-data”
将表单设置为支持图片上传
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%
request.setAttribute("APP_PATH", request.getContextPath());
%>
Document
添加课程
项目到此就结束了,对本项目感兴趣的小伙伴,可在下方链接获取完整项目
戳,获取完整项目 —> 项目地址
提取码: hmpp