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Design＆Bulid 2 总结（上）

2022-07-24 10:05:24 作者：互联网

1.前言

又到了一年一度的Design＆Bulid，这次的项目是和其他专业的同学负责制作一个仓库管理系统。
项目分为两个阶段：第一阶段是与本专业的同学合作，第二阶段才是和其他专业合作。

2.要求

数据库管理和管理员端软件（电子商务专业学生）
与物联网学生共同设计数据库；并创建具有以下功能的web应用程序：
1、允许管理员登录和注销；
2、允许管理员在系统中创建仓库和添加/删除工人
3、显示每个仓库的货物状态（如货物位置）和信息（如货物种类）；
额外功能：
1、生成数据分析报告和可视化。
2、自行设计的其他功能。

3.具体功能的实现

3.1 登录

老师手把手教的内容，没什么难度。

package com.example._2eg.servlet;

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 com.example._2eg.jspservlet.dao.UserDAO;
import com.example._2eg.jspservlet.dao.impl.UserDAOImpl;
import com.example._2eg.vo.User;

@WebServlet("/loginServlet")
public class LoginServlet extends HttpServlet{
    public void doGet(HttpServletRequest req, HttpServletResponse res)
            throws IOException, ServletException{
        this.doPost(req,res);
    }

    public void doPost(HttpServletRequest req, HttpServletResponse res)
            throws IOException, ServletException{
        User user = new User();
        user.setUsername(req.getParameter("username"));
        user.setPassword(req.getParameter("password"));

        UserDAO dao = new UserDAOImpl();
        try {
            user = dao.queryByUsername(user);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        if(user != null){
            HttpSession session=req.getSession();
            session.setAttribute("username", user.getUsername());
            try {
                dao.updateStatus(user);
            } catch (Exception e) {
                e.printStackTrace();
            }
            req.getRequestDispatcher("./welcome.jsp").forward(req,res);
        } else {
            res.sendRedirect("./error.jsp");
        }
    }
}

queryByUsername：直接与DAO层交互，根据用户名在数据库查找用户，返回一个User对象。
updateStatus：直接与DAO层交互，修改数据库中用户的登录状态，主要是做一个登录验证。
这个方法本来是给注销准备的，但是验收的时候老师提醒了一下，只修改数据库层面的状态是不够的

3.2 注销

这里认为只要在数据库里修改状态就OK，但是注销之后发现按浏览器的回退键就可以回到之前的页面。
所以这功能有啥用啊

package com.example._2eg.servlet;

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 com.example._2eg.jspservlet.dao.UserDAO;
import com.example._2eg.jspservlet.dao.impl.UserDAOImpl;
import com.example._2eg.vo.User;

@WebServlet("/logoutServlet")
public class LogoutServlet extends HttpServlet{
   @Override
   protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
       this.doPost(req, resp);
   }

   @Override
   protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

       HttpSession session = req.getSession(true);
       User user = new User();
       user.setUsername((String) session.getAttribute("username"));
       user.setStatus(1);

       UserDAO dao  = new UserDAOImpl();
       try {
           dao.updateStatus(user);
       } catch (Exception e) {
           e.printStackTrace();
       }

       session.invalidate();
       resp.sendRedirect("./login.jsp");
   }
}

3.3 创建仓库

这一部分主要是另一个同学负责的。

package com.example._2eg.servlet;

import com.example._2eg.service.WarehouseService;
import com.example._2eg.service.impl.WarehouseServiceImpl;
import com.example._2eg.vo.Warehouse;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;

@WebServlet(name = "WarehouseAddServlet", value = "/warehouseAddServlet")
public class WarehouseAddServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        Warehouse warehouse = new Warehouse();
        warehouse.setWid(Integer.parseInt(request.getParameter("Id")));
        warehouse.setWname(request.getParameter("Name"));
        WarehouseService service = new WarehouseServiceImpl();
        try {
            if(service.add(warehouse)){
                response.sendRedirect(request.getContextPath()+"/warehouseListServlet");
            }else {
                request.setAttribute("isExist","True");
                request.getRequestDispatcher("/addWarehouse.jsp").forward(request,response);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}

这里用isExist判断是否有id重复的仓库，如果isExist=True，表示ID重复，在页面显示"This employee id already exists"。

    <% String isExistStr = "";%>
    <%if(request.getAttribute("isExist")!=null){ %>

    <%if(request.getAttribute("isExist").equals("True")){%>
    <%isExistStr = "This employee id already exists";%>
    <%}%>
    <%}%>
    <h5 style="text-align: center;"><span style="color: red; "><%= isExistStr %></span></h5>

3.4 展示仓库

这里也主要是另一个同学负责的。

package com.example._2eg.servlet;

import com.example._2eg.service.WarehouseService;
import com.example._2eg.service.impl.WarehouseServiceImpl;
import com.example._2eg.vo.Warehouse;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
import java.sql.SQLException;
import java.util.List;

@WebServlet(name = "WarehouseListServlet", value = "/warehouseListServlet")
public class WarehouseListServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //查询
        WarehouseService wservice = new WarehouseServiceImpl();
        List warehouses = null;
        try {
            warehouses = wservice.findAll();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        //将查到的存入request域
        request.setAttribute("warehouses", warehouses);
        //转发
        request.getRequestDispatcher("/list.jsp").forward(request, response);

    }
}

findAll:查找数据库中所有仓库，将其存储到warehouses，之后遍历。


<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<!DOCTYPE html>
<!-- 网页使用的语言 -->
<html lang="en-US">
<head>
    <!-- 指定字符集 -->
    <meta charset="utf-8">
    <!-- 使用Edge最新的浏览器的渲染方式 -->
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <!-- viewport视口：网页可以根据设置的宽度自动进行适配，在浏览器的内部虚拟一个容器，容器的宽度与设备的宽度相同。
    width: 默认宽度与设备的宽度相同
    initial-scale: 初始的缩放比，为1:1 -->
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!-- 上述3个meta标签*必须*放在最前面，任何其他内容都*必须*跟随其后！ -->
    <title>Warehouse Management</title>

    <!-- 1. 导入CSS的全局样式 -->
    <link href="css/bootstrap.min.css" rel="stylesheet">
    <!-- 2. jQuery导入，建议使用1.9以上的版本 -->
    <script src="js/jquery-2.1.0.min.js"></script>
    <!-- 3. 导入bootstrap的js文件 -->
    <script src="js/bootstrap.min.js"></script>
    <style type="text/css">
        td, th {
            text-align: center;
        }
    </style>

    <script>
        function deleteWarehouse(id){
            //安全提示
            if(confirm("Are you sure to delete？")){
                //访问路径
                location.href="${pageContext.request.contextPath}/warehouseDeleteServlet?uid="+id;
            }
        }

        window.onload = function(){
            //给删除选中按钮添加单击事件
            document.getElementById("delSelected").onclick = function(){
                if(confirm("Are you sure to delete？")){

                    var flag = false;
                    //判断是否有选中条目
                    var cbs = document.getElementsByName("uid");
                    for (var i = 0; i < cbs.length; i++) {
                        if(cbs[i].checked){
                            //有一个条目选中了
                            flag = true;
                            break;
                        }
                    }

                    if(flag){//有条目被选中
                        //表单提交
                        document.getElementById("form").submit();
                    }

                }

            }
            //1.获取第一个cb
            document.getElementById("firstCb").onclick = function(){
                //2.获取下边列表中所有的cb
                var cbs = document.getElementsByName("uid");
                //3.遍历
                for (var i = 0; i < cbs.length; i++) {
                    //4.设置这些cbs[i]的checked状态 = firstCb.checked
                    cbs[i].checked = this.checked;

                }

            }


        }


    </script>
</head>
<body>
<div class="container">
    <h3 style="text-align: center">Warehouse Information</h3>


    <div style="float: right;margin: 5px;">

        <a class="btn btn-primary" href="${pageContext.request.contextPath}/addWarehouse.jsp">Add</a>
        <a class="btn btn-primary" href="javascript:void(0);" id="delSelected">Delete</a>

    </div>
    <form id="form" action="${pageContext.request.contextPath}/warehouseDeleteServlet" method="post">
        <table border="1" class="table table-bordered table-hover">
        <tr class="success">
            <th><input type="checkbox" id="firstCb"></th>
            <th>Id</th>
            <th>Name</th>
        </tr>

        <c:forEach items="${warehouses}" var="warehouse" varStatus="s">
            <tr>
                <td><input type="checkbox" name="uid" value="${warehouse.warehouse_id}"></td>
                <td>${warehouse.warehouse_id}</td>
                <td>${warehouse.warehouse_name}</td>
                <td><a class="btn btn-default btn-sm" href="${pageContext.request.contextPath}/findWarehouseServlet?id=${warehouse.warehouse_id}">Edit</a>&nbsp;
                    <a class="btn btn-default btn-sm" href="javascript:deleteWarehouse(${warehouse.warehouse_id});">Delete</a>
                    <a class="btn btn-default btn-sm" href="${pageContext.request.contextPath}/productListServlet?id=${warehouse.warehouse_id}">Check</a>
                </td>
            </tr>

        </c:forEach>


    </table>
        <input class="btn btn-default" type="button" value="back" onclick="javascript:history.go(-1)">
    </form>
</div>


</body>
</html>

3.5 删除仓库

删除数据库中的对应仓库。

package com.example._2eg.servlet;

import com.example._2eg.service.WarehouseService;
import com.example._2eg.service.impl.WarehouseServiceImpl;
import com.example._2eg.vo.Warehouse;

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 java.io.IOException;

@WebServlet("/warehouseDeleteServlet")
public class WarehouseDeleteServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doPost(req,resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        //1. 获取id
        String[] ids = req.getParameterValues("uid");
        //2. 调用service删除
        WarehouseService service =new WarehouseServiceImpl();
        try {
            service.deleteById(ids);
        } catch (Exception e) {
            e.printStackTrace();
        }
        //3. 跳转到查询所有用户记录的Servlet
        resp.sendRedirect(req.getContextPath()+"/warehouseListServlet");

    }
}

标签：总结,Bulid,com,2eg,Design,._,import,servlet,javax
来源： https://www.cnblogs.com/LindholmX/p/16512988.html