今天小编给大家分享一下怎么用Java开发用户后台管理系统的相关知识点，内容详细，逻辑清晰，相信大部分人都还太了解这方面的知识，所以分享这篇文章给大家参考一下，希望大家阅读完这篇文章后有所收获，下面我们一起来了解一下吧。
主要功能
管理员登录功能、管理员列表操作、用户列表操作、订单管理
登录功能
设计思路：前端页面获取输入的数据，然后发送Ajax请求，在servlet中获取数据并调用service层中的方法进行处理，service层中调用dao层的实现方法，最终servlet返回一个结果集，判断登录是否成功。
login.html主要功能代码：
<script> $(function () { $("#btn_login").click(function () { //获取数据 let username = $("#username").val(); let password = $("#password").val(); //数据处理 $.post("admin/login", {username: username, password: password}, function (result) { if (result.flag) { location.href = "index.html"; } else { alert(result.errorMsg); } }); }); })</script>servlet中功能代码：
//登录 public void login(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //获取用户名和密码 String username = request.getParameter("username"); String password = request.getParameter("password"); //封装管理员对象 Administrator admin = new Administrator(); admin.setAname(username); admin.setPassword(password); //创建结果对象 ResultInfo resultInfo = new ResultInfo(); //调用service查询 Administrator administrator = service.login(admin); if (administrator == null) { resultInfo.setFlag(false); resultInfo.setErrorMsg("用户名或密码错误！"); } if (administrator != null && !administrator.getStatus().equals("Y")) { resultInfo.setFlag(false); resultInfo.setErrorMsg("该账户未激活！"); } if (administrator != null && administrator.getStatus().equals("Y")) { resultInfo.setFlag(true); //设置session request.getSession().setAttribute("username", administrator.getAname()); } //调用父类中定义的方法，转json数据后回传 writeValue(resultInfo, response); }service层中代码实现：
@Override public Administrator login(Administrator administrator) { return dao.login(administrator); }dao层中代码实现：
@Override public Administrator login(Administrator administrator) { Administrator admin = null; try { String sql = "SELECT * FROM administrator WHERE aname = ? AND PASSWORD = ?"; admin = template.queryForObject(sql, new BeanPropertyRowMapper<>(Administrator.class), administrator.getAname(), administrator.getPassword()); } catch (Exception e) { } return admin; }实现效果：
管理员列表
设计思路：数据操作与登录功能大同小异，实现了管理员的增删改查，在此重点介绍分页、模糊查询。
admin_list.html主要功能代码：
<script> $(function () { let name = null; $("#btn_search").click(function () { name = $('#admin_name').val(); load(null, name) //取消按钮的默认跳转行为 导致会刷新页面 return false; }) load(null, name); }); function load(currentPage, admin_name) { //发送ajax请求，请求route/pageQuery，传递cid $.get("admin/pageQuery", {currentPage: currentPage, admin_name: admin_name}, function (pb) { //定义字符 let lis = ""; //计算上一页的页码 let beforeNum = pb.currentPage - 1; if (beforeNum <= 0) { beforeNum = 1; } let beforePage = '<a class="prev" href="javascript:load(' + beforeNum + ',\'' + admin_name + '\')" rel="external nofollow" ><<</a>'; lis += beforePage; //定义开始位置begin，结束位置end let begin; let end; if (pb.totalPage < 10) { //总页码不足10页 begin = 1; end = pb.totalPage; } else { //总页码超过10页 begin = pb.currentPage - 5; end = pb.currentPage + 4; //前边不足5个，后边补齐 if (begin < 1) { begin = 1; end = begin + 9; } if (end > pb.totalPage) { end = pb.totalPage; begin = end - 9; } } //展示分页页码 for (let i = begin; i <= end; i++) { let li; //判断当前页码是否等于i,创建页码的li if (pb.currentPage === i) { li = '<a class="num" href="javascript:load(' + i + ',\'' + admin_name + '\')" rel="external nofollow" rel="external nofollow" ><span class="current">' + i + '</span></a>'; } else { li = '<a class="num" href="javascript:load(' + i + ',\'' + admin_name + '\')" rel="external nofollow" rel="external nofollow" >' + i + '</a>'; } //拼接字符串 lis += li; } //计算下一页的页码 let nextNum = pb.currentPage + 1; if (nextNum >= pb.totalPage) { nextNum = pb.totalPage; } let nextPage = '<a class="next" href="javascript:load(' + nextNum + ',\'' + admin_name + '\')" rel="external nofollow" >>></a>'; lis += nextPage; //将lis内容设置到ul $("#pageNum").html(lis); //列表数据展示 let admin_lis = ""; for (let i = 0; i < pb.list.length; i++) { let admin = pb.list[i]; let li; if (admin.status === "Y") { li = '<tr>\n' + ' <td>\n' + ' <input type="checkbox" name="checkedId" id="checkedId" lay-skin="primary">\n' + ' <div class="layui-unselect layui-form-checkbox" lay-skin="primary"><i class="layui-icon layui-icon-ok"></i></div>' + ' </td>\n' + ' <td>' + admin.aid + '</td>\n' + ' <td>' + admin.aname + '</td>\n' + ' <td>' + admin.phone + '</td>\n' + ' <td>' + admin.email + '</td>\n' + ' <td>' + admin.role + '</td>\n' + ' <td>' + admin.date + '</td>\n' + ' <td class="td-status">\n' + ' <span class="layui-btn layui-btn-normal layui-btn-mini" >已启用</span></td>\n' + ' <td class="td-manage">\n' + ' <a onclick="member_stop(this,' + admin.aid + ')" href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" title="启用">\n' + ' <i class="layui-icon"></i>\n' + ' </a>\n' + ' <a title="编辑" onclick="xadmin.open(\'编辑管理员\',\'admin-edit.html?aid=' + admin.aid + '\',600,500)" href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >\n' + ' <i class="layui-icon"></i>\n' + ' </a>\n' + ' <a title="删除" onclick="member_del(this,\'要删除的id\')" href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >\n' + ' <i class="layui-icon"></i>\n' + ' </a>\n' + ' </td>\n' + '</tr>'; } else if (admin.status === "N") { li = '<tr>\n' + ' <td>\n' + ' <input type="checkbox" name="checkedId" id="checkedId" lay-skin="primary">\n' + ' <div class="layui-unselect layui-form-checkbox" lay-skin="primary"><i class="layui-icon layui-icon-ok"></i></div>' + ' </td>\n' + ' <td>' + admin.aid + '</td>\n' + ' <td>' + admin.aname + '</td>\n' + ' <td>' + admin.phone + '</td>\n' + ' <td>' + admin.email + '</td>\n' + ' <td>' + admin.role + '</td>\n' + ' <td>' + admin.date + '</td>\n' + ' <td class="td-status">\n' + ' <span class="layui-btn layui-btn-normal layui-btn-mini" >已停用</span></td>\n' + ' <td class="td-manage">\n' + ' <a onclick="member_stop(this,' + admin.aid + ')" href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" title="停用">\n' + ' <i class="layui-icon"></i>\n' + ' </a>\n' + ' <a title="编辑" onclick="xadmin.open(\'编辑管理员\',\'admin-edit.html?aid=' + admin.aid + '\',600,500)" href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >\n' + ' <i class="layui-icon"></i>\n' + ' </a>\n' + ' <a title="删除" onclick="member_del(this,\'要删除的id\')" href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >\n' + ' <i class="layui-icon"></i>\n' + ' </a>\n' + ' </td>\n' + '</tr>'; } admin_lis += li; } //设置列表数据 $("#admin_msg").html(admin_lis); }); } </script>servlet中功能代码：
//分页、模糊查询 public void pageQuery(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //接收参数 String currentPageStr = request.getParameter("currentPage"); //接收admin_name管理员名称 String admin_name = request.getParameter("admin_name"); //判断admin_name是否为null if (admin_name != null && !"null".equals(admin_name) && admin_name.length() > 0) { admin_name = new String(admin_name.getBytes("iso-8859-1"), "utf-8"); } else { admin_name = ""; } int currentPage = 0; //当前页码，不传递参数，默认为1 if (currentPageStr != null && currentPageStr.length() > 0) { currentPage = Integer.parseInt(currentPageStr); } else { currentPage = 1; } //每页显示条数，默认为5 int pageSize = 5; //调用service查询PageBean对象 PageBean<Administrator> pb = service.pageQuery(currentPage, pageSize, admin_name); //将pageBean对象序列化为json，返回 writeValue(pb, response); }service层中代码实现：
@Override public PageBean<Administrator> pageQuery(int currentPage, int pageSize, String admin_name) { //封装PageBean PageBean<Administrator> pb = new PageBean<>(); //设置当前页码 pb.setCurrentPage(currentPage); //设置每页显示条数 pb.setPageSize(pageSize); //设置总记录数 int totalCount = dao.findTotalCount(admin_name); pb.setTotalCount(totalCount); //设置当前页显示的数据集合 int start = (currentPage - 1) * pageSize; //开始的记录数 List<Administrator> list = dao.findByPage(start, pageSize, admin_name); pb.setList(list); //设置总页数 = 总记录数/每页显示条数 int totalPage = totalCount % pageSize == 0 ? totalCount / pageSize : (totalCount / pageSize) + 1; pb.setTotalPage(totalPage); return pb; }dao层中代码实现：
@Override public int findTotalCount(String admin_name) { //定义sql模板 String sql = "SELECT COUNT(*) FROM administrator WHERE 1=1 "; StringBuilder sb = new StringBuilder(sql); //条件 List<Object> params = new ArrayList<>(); if (admin_name != null && admin_name.length() > 0) { sb.append(" and aname like ? "); params.add("%" + admin_name + "%"); } sql = sb.toString(); return template.queryForObject(sql, Integer.class, params.toArray()); } @Override public List<Administrator> findByPage(int start, int pageSize, String admin_name) { String sql = "SELECT * FROM administrator WHERE 1=1 "; StringBuilder sb = new StringBuilder(sql); //条件 List<Object> params = new ArrayList<>(); //判断参数是否有值 if (admin_name != null && admin_name.length() > 0) { sb.append(" and aname like ? "); params.add("%" + admin_name + "%"); } //分页条件 sb.append(" limit ?,? "); params.add(start); params.add(pageSize); //转字符串 sql = sb.toString(); return template.query(sql, new BeanPropertyRowMapper<>(Administrator.class), params.toArray()); }实现效果：
用户列表
设计思路：与管理员列表设计思路基本类似。
实现效果：
订单管理
设计思路：与管理员列表设计思路基本类似。
以上就是“怎么用Java开发用户后台管理系统”这篇文章的所有内容，感谢各位的阅读！相信大家阅读完这篇文章都有很大的收获，小编每天都会为大家更新不同的知识，如果还想学习更多的知识，请关注编程网行业资讯频道。
