[Java知识库]JavaWeb课程设计——名片管理系统

一、题目描述(简述)

功能主要分为 四个部分：
1、用户的登录、注册
2、名片管理：增删改查名片，删除分为彻底删除或者放入到回收站中
3、回收站：对删除的名片进行还原或者删除
4、管理员：可以对所有名片和所有用户进行管理

二、使用技术

主要使用 jsp，css，js做的页面(做的很丑确实)
java写代码
使用了 jdbc 连接数据库，servlet处理用户请求和响应，jsp前后台交互。
使用了mvc三层架构。

三、代码演示

1、java代码

结构：

2、页面

3、核心代码

package com.atmae.web;

import com.atmae.pojo.Card;
import com.atmae.pojo.User;
import com.atmae.service.CardService;
import com.atmae.service.UserService;
import com.atmae.service.impl.CardServiceImpl;
import com.atmae.service.impl.UserServiceImpl;

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 java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.nio.charset.StandardCharsets;
import java.util.List;

@WebServlet("/cardServlet")
public class CardServlet extends HttpServlet {
    private CardService cardService = new CardServiceImpl();
    private UserService userService = new UserServiceImpl();

    protected void showAny(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        List<Card> cards = cardService.show();
        req.setAttribute("cards", cards);
        req.getRequestDispatcher("manage1.jsp").forward(req, resp);
    }

    protected void show(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String id = req.getParameter("id");
        int id0 = Integer.parseInt(id);
        Card card = cardService.showCardById(id0);
        if (card == null) {
            req.setAttribute("error", "未找到此id！");
        } else {
            req.setAttribute("card", card);
        }
        req.getRequestDispatcher("show.jsp").forward(req, resp);
    }


    protected void showDelete(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        HttpSession session = req.getSession();
        User user = (User) session.getAttribute("user");
        String username = user.getUsername();
        List<Card> cards = cardService.showCardForDelete(username);
        if (cards != null) {
            req.setAttribute("cards", cards);
        } else {
            req.setAttribute("error", "回收站为空");
        }
        req.getRequestDispatcher("waste.jsp").forward(req, resp);
    }

    protected void showDeleteAdmin(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        List<Card> cards = cardService.showDeleteAdmin();
        if (cards != null) {
            req.setAttribute("cards", cards);
        } else {
            req.setAttribute("error", "回收站为空");
        }
        req.getRequestDispatcher("waste.jsp").forward(req, resp);
    }

    protected void showAll(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        HttpSession session = req.getSession();
        User user = (User) session.getAttribute("user");
        String username = user.getUsername();
        List<Card> cards = cardService.showCards(username);
        if (cards != null) {
            req.setAttribute("cards", cards);
            req.setAttribute("mulity", "mulity");
        } else {
            req.setAttribute("error", "当前用户没有名片");
        }
        req.getRequestDispatcher("show.jsp").forward(req, resp);
    }

    protected void updateName(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String name = req.getParameter("name");
        name = new String(name.getBytes("ISO-8859-1"), "UTF-8");
        String id = req.getParameter("id");
        HttpSession session = req.getSession();
        User user = (User) session.getAttribute("user");
        int id0 = Integer.parseInt(id);
        if (user.getUsername().equals(cardService.showCNameByID(id0)) && cardService.updateName(name, id0)) {
            req.getRequestDispatcher("jump3.jsp").forward(req, resp);
        } else {
            req.setAttribute("error", "未找到此id号");
            req.getRequestDispatcher("update.jsp").forward(req, resp);
        }
    }

    protected void updateAccount(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String account = req.getParameter("account");
        String id = req.getParameter("id");
        HttpSession session = req.getSession();
        User user = (User) session.getAttribute("user");
        int id0 = Integer.parseInt(id);
        if (user.getUsername().equals(cardService.showCNameByID(id0)) && cardService.updateAccount(account, id0)) {
            req.getRequestDispatcher("jump3.jsp").forward(req, resp);
        } else {
            req.setAttribute("error", "未找到此id号");
            req.getRequestDispatcher("update.jsp").forward(req, resp);
        }
    }

    protected void delete(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String name = req.getParameter("name");
        String prem = req.getParameter("prem");
        int prem0 = Integer.parseInt(prem);
        name = new String(name.getBytes("ISO-8859-1"), "UTF-8");
        HttpSession session = req.getSession();
        User user = (User) session.getAttribute("user");
        if (prem0 == 1) {
            if (user.getUsername().equals(cardService.showCNameByName(name)) && cardService.deleteRealByName(name) != -1) {
                req.getRequestDispatcher("jump2.jsp").forward(req, resp);
            } else {
                req.setAttribute("error", "未找到此用户名");
                req.getRequestDispatcher("delete.jsp").forward(req, resp);
            }
        } else {
            if (user.getUsername().equals(cardService.showCNameByName(name)) && cardService.deleteCardByName(name)) {
                req.getRequestDispatcher("jump2.jsp").forward(req, resp);
            } else {
                req.setAttribute("error", "未找到此用户名");
                req.getRequestDispatcher("delete.jsp").forward(req, resp);
            }
        }
    }


    protected void deleteCard(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String id = req.getParameter("id");
        String prem = req.getParameter("prem");
        int prem0 = Integer.parseInt(prem);
        int id0 = Integer.parseInt(id);
        if (prem0 == 1) {
            cardService.deleteCardByID(id0);
            req.getRequestDispatcher("jump7.jsp").forward(req, resp);
        } else {
            cardService.deleteRealById(id0);
            req.getRequestDispatcher("jump6.jsp").forward(req, resp);
        }
    }

    protected void permanent(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String id = req.getParameter("id");
        int id0 = Integer.parseInt(id);
        cardService.deleteWaste(id0);
        req.getRequestDispatcher("jump5.jsp").forward(req, resp);
    }

    protected void restore(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String id = req.getParameter("id");
        int id0 = Integer.parseInt(id);
        cardService.returnWaste(id0);
        req.getRequestDispatcher("jump4.jsp").forward(req, resp);
    }

    protected void insert(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String name = req.getParameter("name");
        String gender = req.getParameter("gender");
        String account = req.getParameter("account");
        String password = req.getParameter("password");
        String email = req.getParameter("email");
        //获取session
        HttpSession session = req.getSession();
        User user = (User) session.getAttribute("user");
        String username = user.getUsername();
        //防止中文乱码
        name = new String(name.getBytes("ISO-8859-1"), "UTF-8");
        gender = new String(gender.getBytes("ISO-8859-1"), "UTF-8");
        Card card = new Card(name, gender, account, password, email, username);
        cardService.insert(card);
        req.getRequestDispatcher("jump.jsp").forward(req, resp);
    }

    protected void insertAny(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String name = req.getParameter("name");
        String gender = req.getParameter("gender");
        String account = req.getParameter("account");
        String password = req.getParameter("password");
        String email = req.getParameter("email");
        String found = req.getParameter("found");
        //防止中文乱码
        name = new String(name.getBytes("ISO-8859-1"), "UTF-8");
        gender = new String(gender.getBytes("ISO-8859-1"), "UTF-8");
        found = new String(found.getBytes("ISO-8859-1"), "UTF-8");
        //查找是否有这个用户名
        boolean flag = false;
        List<User> users = userService.show();
        for (User user : users) {
            if (found.equals(user.getUsername())) {
                flag = true;
                break;
            }
        }
        if (!flag) {
            req.setAttribute("msg", "没有此用户，清重新输入");
            req.getRequestDispatcher("insertAny.jsp").forward(req, resp);
        } else {
            cardService.insert(new Card(name, gender, account, password, email, found));
            req.getRequestDispatcher("jump8.jsp").forward(req, resp);
        }
    }

    protected void showUser(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        List<User> users = userService.show();
        if (users == null) {
            req.setAttribute("error", "当前没有用户信息");
            req.getRequestDispatcher("manage1.jsp");
        } else {
            req.setAttribute("usersM", users);
            req.getRequestDispatcher("manage1.jsp").forward(req, resp);
        }
    }

    protected void deleteUser(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String name = req.getParameter("name");
        name=new String(name.getBytes("ISO-8859-1"), "UTF-8");
        userService.deleteUser(name);
        cardService.deleteRealByUserName(name);
        req.getRequestDispatcher("jump9.jsp").forward(req,resp);
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //反射获取获取
        String action = req.getParameter("action");
        try {
            //获取action业务鉴别字符串，获取相应的业务 方法反射对象
            Method method = this.getClass().getDeclaredMethod(action, HttpServletRequest.class, HttpServletResponse.class);
            //调用目标业务方法
            method.invoke(this, req, resp);
        } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
            e.printStackTrace();
        }
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //反射获取获取
        String action = req.getParameter("action");
        try {
            //获取action业务鉴别字符串，获取相应的业务 方法反射对象
            Method method = this.getClass().getDeclaredMethod(action, HttpServletRequest.class, HttpServletResponse.class);
            //调用目标业务方法
            method.invoke(this, req, resp);
        } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
            e.printStackTrace();
        }
    }
}

四、功能演示

1、注册功能

2、登录

普通用户+管理员登录

3、添加功能

4、删除用户 显示 回收站功能