⭐基于bootstap-Jquery-JSP-Servlet-mysql⭐博客项目——后台资源管理demo2
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上一篇文章中实现了后台资源管理中的用户资源管理，这一篇介绍资源类别管理的实现
资源类别管理
获取所有资源类别信息并分页
在controller中的resource包下创建DoCategorySelect.java，代码如下
@WebServlet("/manage/admin_do_category_select")
public class DoCategorySelect extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// 当前页
int currentPage = 1;
// 每页显示条数
int count = 5;
// array[0]=资源类别总数，array[1]=总页数，后面会被覆盖
int array[] = { 0, 0 };
// 获取用户指定的页面
String cp = request.getParameter("currentPage");
System.out.println("cp = " + cp);
// 接收用户搜索的关键字
String keyword = request.getParameter("keywords");
/* 用户如果有指定当前页，则把字符串转化为int型 */
if (cp != null) {
currentPage = Integer.parseInt(cp);
}
// 创建资源service层接口的实现类
ResourceServiceImpl resourceServiceImpl = new ResourceServiceImpl();
/*
* 调用业务逻辑方法获取资源类别记录总数并算出总页数 即(array[0]=资源类别总数，array[1]=总页数(资源类别总数/每页显示条数)
*/
try {
array = resourceServiceImpl.getRsCategoryPageTotal(count, keyword);
} catch (SQLException e) {
e.printStackTrace();
}
// 调用业务逻辑方法获取所有资源类别信息
ArrayList<Category> listCategory = null;
try {
listCategory = resourceServiceImpl.getAllRsCategory(currentPage, count, keyword);
} catch (SQLException e) {
e.printStackTrace();
}
// 放到请求对象域里
request.setAttribute("categoryList", listCategory);
request.setAttribute("totalStudent", array[0]);
request.setAttribute("totalPage", array[1]);
request.setAttribute("currentPage", currentPage);
/* 若用户是通过搜索的，把关键词放在请求域中 */
if (keyword != null) {
request.setAttribute("searchParams", "&keywords=" + keyword);
}
request.getRequestDispatcher("/WEB-INF/manage/admin_category.jsp").forward(request, response);
}
}
在service层的ResourceService接口中添加如下业务逻辑抽象方法
// 获取所有资源类别记录总数及页数
public int[] getRsCategoryPageTotal(int count, String keyword) throws SQLException;
// 获取所有资源的的类别信息
public ArrayList<Category> getAllRsCategory(int currentPage, int count, String keyword) throws SQLException;
在service层的实现类ResourceServiceImpl中重写接口方法，如下
@Override
public int[] getRsCategoryPageTotal(int count, String keyword) throws SQLException {
// 检索所有资源类别总数并算出总页数
int[] array = resourceDao.selectRsCategoryTotal(count, keyword);
return array;
}
@Override
public ArrayList<Category> getAllRsCategory(int currentPage, int count, String keyword) throws SQLException {
// 检索所有资源的类别信息
ArrayList<Category> listCategory = resourceDao.selectAllRsCategory(currentPage, count, keyword);
return listCategory;
}
在dao层的ResourceDao接口中添加添加如下抽象方法，执行底层操作，如下
// 检索所有资源类别总数并算出总页数
public int[] selectRsCategoryTotal(int count, String keyword) throws SQLException;
// 检索所有资源的资源类别
public ArrayList<Category> selectAllRsCategory(int currentPage, int count, String keyword) throws SQLException;
在dao层的实现类ResourceDaoImpl中重写接口方法，如下
@Override
public int[] selectRsCategoryTotal(int count, String keyword) throws SQLException {
String sql = "";
// 0 资源类别总记录数 1 页数
int array[] = { 0, 1 };
if (keyword != null) {
sql = "select count(*) from category where category_name like ?";
resultSet = JDBCUtil.executeQuery(sql, "%" + keyword + "%");
} else {
sql = "select count(*) from category";
resultSet = JDBCUtil.executeQuery(sql);
}
while (resultSet.next()) {
array[0] = resultSet.getInt(1);
if (array[0] % count == 0) {
array[1] = array[0] / count;
} else {
array[1] = array[0] / count + 1;
}
}
return array;
}
@Override
public ArrayList<Category> selectAllRsCategory(int currentPage, int count, String keyword) throws SQLException {
ArrayList<Category> listCategory = new ArrayList<Category>();
String sql = "";
if (keyword != null) {
sql = "select * from category where category_name like ? limit ?, ?";
resultSet = JDBCUtil.executeQuery(sql, "%" + keyword + "%", (currentPage - 1) * count, count);
} else {
sql = "select * from category limit ?, ?";
resultSet = JDBCUtil.executeQuery(sql, (currentPage - 1) * count, count);
}
while (resultSet.next()) {
Category category = new Category(Integer.parseInt(resultSet.getString("Category_id")),
resultSet.getString("Category_name"), resultSet.getString("Category_desc"));
listCategory.add(category);
}
return listCategory;
}
后台资源类别管理页面
在manage文件夹中创建admin_category.jsp，代码如下
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ include file="admin_menu.jsp"%>
<div class="main-wrap">
<div class="crumb-wrap">
<div class="crumb-list">
<i class="icon-font"></i><a
href="${pageContext.request.contextPath}/manage/admin_index">首页</a><span
class="crumb-step">></span><span class="crumb-name">类别管理</span>
</div>
</div>
<div class="search-wrap">
<div class="search-content">
<form action="admin_do_category_select" method="get">
<table class="search-tab">
<tr>
<th width="70">关键字:</th>
<td><input class="common-text" placeholder="输入资源类别名称"
name="keywords" id="" type="text"></td>
<td><input class="btn btn-primary btn2" name="sub" value="查询"
type="submit"></td>
</tr>
</table>
</form>
</div>
</div>
<div id="register" class="result-wrap">
<form action="admin_do_category_delete" id="delectForm" method="post">
<input type="hidden" name="currentPage" value="${currentPage }">
<div class="result-title">
<div class="result-list">
<a
href="${pageContext.request.contextPath}/manage/admin_to_category_add">
<i class="icon-font"></i>添加类别
</a> <a id="batchDel"
href="javascript:deleteMore('你确定删除这些资源类别吗？', 'delectForm')"> <i
class="icon-font"></i>批量删除
</a>
</div>
</div>
<div class="result-content" id="dg">
<table class="result-tab" width="100%">
<tr>
<th class="tc" width="5%"><input class="allChoose" name=""
onclick="selAll(this)" type="checkbox"></th>
<th>编号</th>
<th>类别名称</th>
<th>类别描述</th>
<th>操作</th>
</tr>
<c:forEach var="u" items="${categoryList}" varStatus="loop">
<tr>
<td class="tc"><input name="id[]" value="${u.categoryId}"
type="checkbox"></td>
<td>${u.categoryId }</td>
<td>${u.categoryName }</td>
<td>${u.categoryDesc }</td>
<td><a class="link-update"
href="${pageContext.request.contextPath}/manage/admin_to_category_update?id=${u.categoryId}¤tPage=${currentPage}">修改</a>
<a class="link-del"
href="javascript:Delete('你确定要删除类别【${u.categoryName} 】吗？', '${pageContext.request.contextPath}/manage/admin_do_category_delete?id=${u.categoryId}¤tPage=${currentPage }')">删除</a>
</td>
</tr>
</c:forEach>
</table>
<div class="list-page">
共 ${totalStudent} 条记录， 当前 ${currentPage} / ${totalPage} 页 <a
href="admin_do_category_select?currentPage=1${searchParams}">首页</a> <a
href="admin_do_category_select?currentPage=${currentPage - 1 < 1 ? 1 : currentPage-1}${searchParams}">上一页</a>
<a
href="admin_do_category_select?currentPage=${currentPage + 1 > totalPage ? totalPage : currentPage + 1}${searchParams}">下一页</a>
<a href="admin_do_category_select?currentPage=${totalPage}${searchParams}">尾页</a>
</div>
</div>
</form>
</div>
</div>
<script src="${pageContext.request.contextPath}/js/function.js"></script>
</body>
</html>
在这里就可以测试分页功能了，测试前需要在数据库中添加资源类别信息,我就不演示了
删除单个资源类别和批量删除资源类别
在controller中的resource包下创建DoCategoryDelete.java，代码如下
@WebServlet("/manage/admin_do_category_delete")
public class DoCategoryDelete extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
/* 设置字符编码，解决中文乱码问题 */
request.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=utf-8");
/* 接收客户端信息 */
String id= request.getParameter("id");
// 创建资源service层接口的实现类
ResourceServiceImpl resourceServiceImpl = new ResourceServiceImpl();
/* 调用业务逻辑方法删除资源类别 */
int count = 0;
try {
count = resourceServiceImpl.removeRsCategory(id);
} catch (SQLException e) {
e.printStackTrace();
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