詳解Java快速上手用戶後臺管理系統
主要功能
管理員登錄功能、管理員列表操作、用戶列表操作、訂單管理
登錄功能
設計思路：前端頁面獲取輸入的數據，然後發送Ajax請求，在servlet中獲取數據並調用service層中的方法進行處理，service層中調用dao層的實現方法，最終servlet返回一個結果集，判斷登錄是否成功。
login.html主要功能代碼：
<script>
$(function () {
$("#btn_login").click(function () {
//獲取數據
let username = $("#username").val();
let password = $("#password").val();
//數據處理
$.post("admin/login", {username: username, password: password}, function (result) {
if (result.flag) {
location.href = "index.html";
} else {
alert(result.errorMsg);
}
});
});
})
</script>
servlet中功能代碼：
//登錄
public void login(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//獲取用戶名和密碼
String username = request.getParameter("username");
String password = request.getParameter("password");
//封裝管理員對象
Administrator admin = new Administrator();
admin.setAname(username);
admin.setPassword(password);
//創建結果對象
ResultInfo resultInfo = new ResultInfo();
//調用service查詢
Administrator administrator = service.login(admin);
if (administrator == null) {
resultInfo.setFlag(false);
resultInfo.setErrorMsg("用戶名或密碼錯誤！");
}
if (administrator != null && !administrator.getStatus().equals("Y")) {
resultInfo.setFlag(false);
resultInfo.setErrorMsg("該賬戶未激活！");
}
if (administrator != null && administrator.getStatus().equals("Y")) {
resultInfo.setFlag(true);
//設置session
request.getSession().setAttribute("username", administrator.getAname());
}
//調用父類中定義的方法，轉json數據後回傳
writeValue(resultInfo, response);
}
service層中代碼實現：
@Override
public Administrator login(Administrator administrator) {
return dao.login(administrator);
}
dao層中代碼實現：
@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;
}
實現效果：
管理員列表
設計思路：數據操作與登錄功能大同小異，實現瞭管理員的增刪改查，在此重點介紹分頁、模糊查詢。
admin_list.html主要功能代碼：
<script>
$(function () {
let name = null;
$("#btn_search").click(function () {
name = $('#admin_name').val();
load(null, name)
//取消按鈕的默認跳轉行為 導致會刷新頁面
return false;
})
load(null, name);
});
function load(currentPage, admin_name) {
//發送ajax請求，請求route/pageQuery，傳遞cid
$.get("admin/pageQuery", {currentPage: currentPage, admin_name: admin_name}, function (pb) {
//定義字符
let lis = "";
//計算上一頁的頁碼
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;
//定義開始位置begin，結束位置end
let begin;
let end;
if (pb.totalPage < 10) {
//總頁碼不足10頁
begin = 1;
end = pb.totalPage;
} else {
//總頁碼超過10頁
begin = pb.currentPage - 5;
end = pb.currentPage + 4;
//前邊不足5個，後邊補齊
if (begin < 1) {
begin = 1;
end = begin + 9;
}
if (end > pb.totalPage) {
end = pb.totalPage;
begin = end - 9;
}
}
//展示分頁頁碼
for (let i = begin; i <= end; i++) {
let li;
//判斷當前頁碼是否等於i,創建頁碼的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;
}
//計算下一頁的頁碼
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;
//將lis內容設置到ul
$("#pageNum").html(lis);
//列表數據展示
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" style="background-color: #1E9FFF">已啟用</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="啟用">\n' +
' <i class="layui-icon"></i>\n' +
' </a>\n' +
' <a title="編輯" onclick="xadmin.open(\'編輯管理員\',\'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="刪除" onclick="member_del(this,\'要刪除的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" style="background-color: gray">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="編輯" onclick="xadmin.open(\'編輯管理員\',\'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="刪除" onclick="member_del(this,\'要刪除的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;
}
//設置列表數據
$("#admin_msg").html(admin_lis);
});
}
</script>
servlet中功能代碼：
//分頁、模糊查詢
public void pageQuery(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//接收參數
String currentPageStr = request.getParameter("currentPage");
//接收admin_name管理員名稱
String admin_name = request.getParameter("admin_name");
//判斷admin_name是否為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; //當前頁碼，不傳遞參數，默認為1
if (currentPageStr != null && currentPageStr.length() > 0) {
currentPage = Integer.parseInt(currentPageStr);
} else {
currentPage = 1;
}
//每頁顯示條數，默認為5
int pageSize = 5;
//調用service查詢PageBean對象
PageBean<Administrator> pb = service.pageQuery(currentPage, pageSize, admin_name);
//將pageBean對象序列化為json，返回
writeValue(pb, response);
}
service層中代碼實現：
@Override
public PageBean<Administrator> pageQuery(int currentPage, int pageSize, String admin_name) {
//封裝PageBean
PageBean<Administrator> pb = new PageBean<>();
//設置當前頁碼
pb.setCurrentPage(currentPage);
//設置每頁顯示條數
pb.setPageSize(pageSize);
//設置總記錄數
int totalCount = dao.findTotalCount(admin_name);
pb.setTotalCount(totalCount);
//設置當前頁顯示的數據集合
int start = (currentPage - 1) * pageSize; //開始的記錄數
List<Administrator> list = dao.findByPage(start, pageSize, admin_name);
pb.setList(list);
//設置總頁數 = 總記錄數/每頁顯示條數
int totalPage = totalCount % pageSize == 0 ? totalCount / pageSize : (totalCount / pageSize) + 1;
pb.setTotalPage(totalPage);
return pb;
}
dao層中代碼實現：
@Override
public int findTotalCount(String admin_name) {
//定義sql模板
String sql = "SELECT COUNT(*) FROM administrator WHERE 1=1 ";
StringBuilder sb = new StringBuilder(sql);
//條件
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);
//條件
List<Object> params = new ArrayList<>();
//判斷參數是否有值
if (admin_name != null && admin_name.length() > 0) {
sb.append(" and aname like ? ");
params.add("%" + admin_name + "%");
}
//分頁條件
sb.append(" limit ?,? ");
params.add(start);
params.add(pageSize);
//轉字符串
sql = sb.toString();
return template.query(sql, new BeanPropertyRowMapper<>(Administrator.class), params.toArray());
}
實現效果：
用戶列表
設計思路：與管理員列表設計思路基本類似。
實現效果：
訂單管理
設計思路：與管理員列表設計思路基本類似。
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