效果如下图
它所实现的就是把数据库中一个表中所有的数据一条一条以表格的形式输出在网页上,
实现方法如下
首先我们要从数据库读取数据,这里要借助javabean来方便我们传递数据
以上面的为例,我要输出课程信息,就要设置好一个课程类,把相应的属性设置好,接下来就要在serverlet中把数据读取进来了
下面是代码:
package serverlet; import java.io.IOException; import java.sql.Connection; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.util.ArrayList; 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 Bean.clas; import Bean.reportbean; import DBUtil.DBUtil; /** * Servlet implementation class showclasslet */ @WebServlet("/showclasslet") public class showclasslet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public showclasslet() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub response.getWriter().append("Served at: ").append(request.getContextPath()); HttpSession session = request.getSession(); request.setCharacterEncoding("UTF-8"); response.setCharacterEncoding("UTF-8"); Connection con = null; //这里是获取数据库连接 con=DBUtil.getConnection(); //ArryList为一个动态数组,现在这里它就是一个clas类的数组 ArrayList<clas> list = new ArrayList<clas>(); clas x=new clas(); Statement stmt; ResultSet rsst = null ; try { stmt = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY); rsst = stmt.executeQuery("select * from class where stand='0'"); } catch (SQLException e) { // TODO 自动生成的 catch 块 e.printStackTrace(); } try { while(rsst.next()) { x=new clas(); //将读取到的数据存入该对象中 x.setName(rsst.getString(2)); x.setPerson(rsst.getString(4)); x.setTeacher(rsst.getString(3)); x.setChose(rsst.getString(5)); x.setHao(rsst.getString(6)); x.setTname(rsst.getString(8)); //将赋好值的对象添加入动态数组中 list.add(x); } } catch (SQLException e) { // TODO 自动生成的 catch 块 e.printStackTrace(); } //将动态数组存入session中,方便之后在jsp调用 session.setAttribute("list", list); response.sendRedirect("showclass.jsp"); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }
通过上面的操作,已经将数据库中的数据存入了动态数组中,并存储在了session对象"list"中,接下来只要在jsp中将其遍历输出就可以了
这里将其全部输出使用到了<c:forEach>标签,具体代码如下:
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Insert title here</title> </head> <style type="text/css"> /*这里是一些css代码,用来美化表格的,不重要*/ table { width: 90%; background: #ccc; margin: 10px auto; border-collapse: collapse; } th,td { height: 25px; line-height: 25px; text-align: center; border: 1px solid #ccc; } th { background: #eee; font-weight: normal; } tr { background: #fff; } tr:hover { background: #66FFFF ; } td a { color: #06f; text-decoration: none; } td a:hover { color: #06f; text-decoration: underline; } </style> <body><% int i=0; %> <table class="table table-striped"> <thead> <tr> <th>#</th> <th>名称</th> <th>编号</th> <th>教师</th> <th>总人数</th> <th>已选人数</th> </tr> </thead> <tbody> <!--这里开始循环输出list对象中的信息--> <c:forEach items="${list}" var="clas"> <tr> <th scope="row"><%=++i %></th> <td><a href='classinforlet?hao=${clas.hao} ' >${clas.name}</a> <td>${clas.hao}</td> <td>${clas.tname}</td> <td>${clas.person}</td> <td>${clas.chose}</td> </tr> </c:forEach> </tbody> </table> </body> </html>
注意一下,要使用<c:forEach>标签,jsp开头的“<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>”是必须要有的,这是为了导入相应的标签库。
以上就是全部内容了,感谢阅读。