导入JSTL的标签库

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

 若查询到的云记列表为空,显示提示信息,不呈现页面

<c:if test="${resultInfo.code == 0 }">
			<h2>${resultInfo.msg }</h2>
		</c:if>

 呈现首页显示列表

<c:if test="${resultInfo.code == 1 }">
			<div class="note_datas">
				<ul>
					<c:forEach items="${resultInfo.result.datas }" var="item">
						<fmt:formatDate value="${item.pubTime}" pattern="yyyy-MM-dd" var="pubTime"/>
						<li>『 ${pubTime }』&nbsp;&nbsp;<a href="note?action=detail&noteId=${item.noteId }">${item.title }</a> </li>
					</c:forEach>
				</ul>
			</div>

分页的操作JSP (这一串代码,整个人处于懵逼状态)

<nav style="text-align: center">
			  <ul class="pagination  center">
			  	
			  		
			  		<li><a href="index?pageNum=1<c:if test="${!empty action }">&action=${action }</c:if><c:if test="${!empty title }">&title=${title }</c:if><c:if test="${!empty date }">&pubTime=${date }</c:if><c:if test="${!empty typeId }">&typeId=${typeId }</c:if>">首页</a></li>
			  		<li><a href="index?pageNum=${resultInfo.result.prePage }
					<c:if test="${!empty action }">&action=${action }</c:if>
					<c:if test="${!empty title }">&title=${title }</c:if><c:if test="${!empty date }">&pubTime=${date }</c:if>
					<c:if test="${!empty typeId }">&typeId=${typeId }</c:if>">上一页</a></li>
			  
		  		<c:forEach begin="${resultInfo.result.startNavPage }" end="${resultInfo.result.endNavPage }" var="p">
		  			<li <c:if test="${p == resultInfo.result.pageNum }">class="active"</c:if> >
		  			<a href="index?pageNum=${p}<c:if test="${!empty action }">&action=${action }</c:if>
		  			<c:if test="${!empty title }">&title=${title }</c:if>
		  			<c:if test="${!empty date }">&pubTime=${date }</c:if>
		  			<c:if test="${!empty typeId }">&typeId=${typeId }</c:if>">${p }</a></li>
		  		</c:forEach>
		  		
			  </ul>
			</nav>
		</c:if>
	</div>

TypeServlet:

首先得到用户行为

String action = request.getParameter("action");

if ("list".equals(action)) {
			//查询类型列表
			typeList(request,response);
		}

private void typeList(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		//1.从session作用域中得到用户对象，得到userId
		User user = (User) request.getSession().getAttribute("user");
		Integer userId = user.getUserId();
		//2.调用Service层，返回result对象
		ResultInfo<List<NoteType>> resultInfo = typeService.findTypeList(userId);
		//3.将resultInfo对象存到request作用域
		request.setAttribute("resultInfo", resultInfo);
		//4.设置动态包含的页面
		request.setAttribute("changePage", "type/list.jsp");
		//5.请求转发到index.jsp
		request.getRequestDispatcher("index.jsp").forward(request, response);
	}

Service层:

public ResultInfo<List<NoteType>> findTypeList(Integer userId) {
		ResultInfo<List<NoteType>> resultInfo = new ResultInfo<List<NoteType>>();
		
		//调用Dao层，通过用户ID查询类型的集合
		List<NoteType> typeList = typeDao.findTypeList(userId);
		//判断集合是否为空
		if (typeList !=null && typeList.size()>0) {
			resultInfo.setCode(1);
			resultInfo.setResult(typeList);
		}else{
			resultInfo.setCode(0);
			resultInfo.setMsg("未查询到类型数据！");
		}
		return resultInfo;
	}

Dao层:

public int editNote(String typeId, String title, String content,
			String noteId) {
		String sql = "";
		List<Object> params = new ArrayList<Object>();
		params.add(typeId);
		params.add(title);
		params.add(content);
		if (StringUtil.isNotEmpty(noteId)) {	//修改操作
			
			sql = "update tb_note set typeId = ?,title = ?,content=? where noteId = ?";
			params.add(noteId);
		}else{//添加操作
			sql = "insert into tb_note (typeId,title,content,pubTime) values (?,?,?,now())";
		}
		int row = baseDao.executeUpdate(sql, params);
		return row;
	}

注:params中注入的类型要和问号对应

public int executeUpdate(String sql,List<Object> params) {
		int row = 0;		//受影响的行数
		Connection connection = null;
		PreparedStatement preparedStatement = null;
		try {
			//得到数据库连接
			connection = DBUtil.getConnection();
			//预编译
			preparedStatement = connection.prepareStatement(sql);
			//设置参数
			//判断参数集合是否为空
			if (params !=null && params.size()>0) {
				//循环设置参数，下标从1开始
				for (int i = 0; i < params.size(); i++) {
					preparedStatement.setObject(i+1, params.get(i));
				}
			}
			//执行更新，返回受影响的行数
			row = preparedStatement.executeUpdate();
		} catch (Exception e) {
			e.printStackTrace();
		}
		finally{
			//关闭资源
			DBUtil.close(null, preparedStatement, connection);
			
		}
		return row;
	}