JavaWeb+MySQL+MVC三层架构实现课程管理系统

Posted 2021-10-09 死神Bug终结者

JavaWeb+mysql实现课程管理系统

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

开发环境

• jdk1.8
• mysql5.7

技术栈：

后端：JavaWeb+MySQL

前端：bootstrap+jsp

数据表

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`)
)

项目简介

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

效果图

项目结构

Java源码

前端结构

核心代码

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: <input type="text" name="username" value="张三丰">		
				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  <input type="file" class="form-control" name="img_src">
				//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"%>    
<!DOCTYPE html>
<html lang="en">
<head>
	<%
		request.setAttribute("APP_PATH", request.getContextPath());
		
	%>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <!-- 相对路径，相对于当前访问的文件的位置开始查找 -->
    <link rel="stylesheet" href="${APP_PATH}/static/admin/css/bootstrap.min.css">
    <style>
       .cus-container{
           width: 1368px;
       }
       .success th,table td{text-align:center;}
    </style>
</head>
<body>
    <div class="container cus-container">
    	
        <h3 class="text-center" style="font-weight:bold">课程列表</h3>
        
          <div>
            <!-- 搜索框div -->
            <div id="search-user" style="float: left; margin: 10px 0px;">
                <form class="form-inline" action="${APP_PATH }/route/list" method="post" >
                    <div class="form-group">
                        <label for="course_name">课程名称</label>
                        <input type="text" name="course_name" value="${courseName }" class="form-control" id="course_name" >
                    </div>
                    
                    <div class="form-group">
                        <label>课程分类</label>
                        <select class="form-control" name="cid">
                        	<option value="">请选择</option>
                        	<c:forEach items="${categoryList }" var="cat">
                        		<option value="${cat.id }" ${cid == cat.id ? "selected":""}>${cat.cat_name}</option>
                        	</c:forEach>
						</select>
                    </div>
                    
                    <div class="form-group">
                        <label for="exampleInputName2">价格:</label>
                        <input type="text" name="min" value="${min }" class="form-control" >-<input type="text" name="max" value="${max }" class="form-control" >
  	                  </div>
                    
                    
                   <input type="submit"  class="btn btn-default" value="查询">
                  
                </form>    
            </div>

        </div>
        
        
        <div>
            <!-- 添加、删除的按钮 -->
            <div style="float: right;margin: 10px 0px;">
                <a class="btn btn-primary" href="${APP_PATH}/route/add">添加课程</a>
            </div>
        </div>
      
       <table class="table table-bordered clearfix">
        <tr class="success"> 
        	<th>课程序号</th>          
            <th>课程名称</th>
            <th>分类名称</th>            
            <th>总课时</th>
            <th>课程价格</th>
            <th>课程封面</th>
            <th>购买数量</th>
            <th>观看数量</th>
            <th>状态</th>
            <th>操作</th>
        </tr> 
        
        <c:forEach items="${pager.courseList }" var="course">
	        <tr>
	        <td style="vertical-align:middle;width:100px">
	           		 ${course.id }
	            </td>
	        	<td style="vertical-align:middle;width:135px">
	        		${course.course_name }
	        	</td>
	        	
	            <td style="vertical-align:middle;">
	            	${course.cat_name }
	            </td>
	            <td style="vertical-align:middle;">
	            	${course.lesson_nums }
	            </td>
	            <td style="vertical-align:middle;">
	            	${course.price }
	            </td>
	            <td style="width:200px;height:100px;vertical-align:middle;">
	            	<img src="http://127.0.0.1/upload/images/${course.cover_img }" style="width:100%;height:100%">
	            </td>
	            <td style="vertical-align:middle;">            	
	            	${course.buy_count }
	            </td>
	            
	            <td style="vertical-align:middle;">            	
	            	${course.view_count }
	            </td>
	            
	            <td style="vertical-align:middle;">            	
	            	<c:if test="${course.status == 0 }">已下架</c:if>
	            	<c:if test="${course.status == 1 }">已上架</c:if>
	            </td>
	            
	            <td style="vertical-align:middle;width:135px">
	            		<a class="btn btn-default btn-sm" href="${APP_PATH}/route/edit?id=${course.id}">修改</a>&nbsp;
	                <a class="btn btn-default btn-sm" href="${APP_PATH}/course/delete?id=${course.id}&cover_img=${course.cover_img}">删除</a>
	            </td>
	        </tr>
        	
        </c:forEach>
        
      </table>

   <!-- 分页导航 -->
      <div>
          <!-- 分页导航 -->
        <nav style="float: left;">
            <ul class="pagination">
             
              <li ${pager.pageNumb == 1 ? "class='disabled'":""}>
                <a href="${APP_PATH }/route/list?pageNumb=${pager.prevPageNumb}&course_name=${courseName}&cid=${cid}&min=${min}&max=${max}" aria-label="Previous">
                  <span aria-hidden="true">上一页</span>
                </a>
              </li>
              <c:forEach begin="1" end="${pager.pageCount }" var="i">
	              <li ${pager.pageNumb == i ? "class='active'":"" }>
	              	<a href="${APP_PATH }/route/list?pageNumb=${i}&course_name=${courseName}&cid=${cid}&min=${min}&max=${max}">${i}</a>
	              </li>
              </c:forEach>
             
              
              <li ${pager.pageNumb == pager.pageCount ? "class='disabled'":""}>
                <a href="${APP_PATH }/route/list?pageNumb=${pager.nextPageNumb}&course_name=${courseName}&cid=${cid}&min=${min}&max=${max}" aria-label="Previous">
                  <span aria-hidden="true">下一页</span>
                </a>
              </li>
              
              
              
            </ul>
        </nav>
        <div style="float: right;margin-top: 25px;">
            <span>共${pager.total}条记录，分${pager.pageCount}页显示</span>
        </div>
      </div>
    </div>
</body>
</html>

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" %>    
<!DOCTYPE html>
<html lang="en">
<head>
	<%
		request.setAttribute("APP_PATH", request.getContextPath());
	%>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="${APP_PATH}/static/admin/css/bootstrap.min.css">
	<script src="${APP_PATH}/static/admin/js/jquery-2.1.0.min.js"></script>
	<script src="${APP_PATH}/static/admin/js/bootstrap.min.js"></script>

</head>
<body>

	<div class="container cus-container">
        <h3 class="text-center" style="font-weight:bold">添加课程</h3>

        <form action="${APP_PATH}/course/addHandle" method="post" 
        	  enctype="multipart/form-data">
            <div class="form-group">
              <label for="user">课程名称：</label>
              <input type="text" class="form-control" name="course_name">
            </div>
            
            <div class="form-group">
              <label for="user">所属分类：</label>
              <select class="form-control" name="cid">
		         <option value="0">请选择</option>
		         <c:forEach items="${categoryList }" var="cat">
		         	<option value="${cat.id }">${cat.cat_name }</option>
		         </c:forEach>
			  </select>
            </div>
            
            <div class="form-group">
              <label for="user">课程封面图：</label>
              <input type="file" class="form-control" name="cover_img">
            </div>
            
            <div class="form-group">
              <label for="user">课时数：</label>
              <input type="text" class="form-control" name="lesson_nums">
            </div>
            
            <div class="form-group">
              <label for="user">价格：</label>
              <input type="text" class="form-control" name="price">
            </div>
            
            <div class="form-group">
              <label for="user">状态：</label>
              <div class="radio">
				  <label>
				    <input type="radio" name="status" value=1>
				    上架
				  </label>
			  </div>
			  <div class="radio">
				  <label>
				    <input type="radio" name="status" value="0">
				    下架
				  </label>
			  </div>
            </div>
            
            <div class="text-center">
                <input type="submit" class="btn btn-primary" value="提交">
                <button type="reset" class="btn btn-default">重置</button>   
            </div>         
          </form>
       
    </div>
</body>
</html>

结语

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