前端与后端交互——jsp页面与Servrlt
思路
1.Jsp页面
1 <%@ page contentType="text/html;charset=UTF-8" language="java" %> 2 3 <%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> 4 5 <!DOCTYPE html> 6 <!-- 网页使用的语言 --> 7 <html lang="zh-CN"> 8 <head> 9 <!-- 指定字符集 --> 10 <meta charset="utf-8"> 11 <!-- 使用Edge最新的浏览器的渲染方式 --> 12 <meta http-equiv="X-UA-Compatible" content="IE=edge"> 13 <!-- viewport视口：网页可以根据设置的宽度自动进行适配，在浏览器的内部虚拟一个容器，容器的宽度与设备的宽度相同。 14 width: 默认宽度与设备的宽度相同 15 initial-scale: 初始的缩放比，为1:1 --> 16 <meta name="viewport" content="width=device-width, initial-scale=1"> 17 <!-- 上述3个meta标签*必须*放在最前面，任何其他内容都*必须*跟随其后！ --> 18 <title>用户信息管理系统</title> 19 20 <!-- 1. 导入CSS的全局样式 --> 21 <link href="css/bootstrap.min.css" rel="stylesheet"> 22 <!-- 2. jQuery导入，建议使用1.9以上的版本 --> 23 <script src="js/jquery-2.1.0.min.js"></script> 24 <!-- 3. 导入bootstrap的js文件 --> 25 <script src="js/bootstrap.min.js"></script> 26 <style type="text/css"> 27 td, th { 28 text-align: center; 29 } 30 </style> 31 32 <script> 33 function deleteUser(id){ 34 //用户安全提示 35 if(confirm("您确定要删除吗？")){ 36 //访问路径 37 location.href="${pageContext.request.contextPath}/delUserServlet?id="+id; 38 } 39 } 40 41 window.onload = function(){ 42 //给删除选中按钮添加单击事件 43 document.getElementById("delSelected").onclick = function(){ 44 if(confirm("您确定要删除选中条目吗？")){ 45 var flag = false; 46 //判断是否有选中条目 47 var cbs = document.getElementsByName("uid"); 48 for (var i = 0; i < cbs.length; i++) { 49 if(cbs[i].checked){ 50 //有一个条目选中了 51 flag = true; 52 break; 53 } 54 } 55 56 if(flag){//有条目被选中 57 //表单提交 58 document.getElementById("form").submit(); 59 } 60 } 61 } 62 //1.获取第一个cb 63 document.getElementById("firstCb").onclick = function(){ 64 //2.获取下边列表中所有的cb 65 var cbs = document.getElementsByName("uid"); 66 //3.遍历 67 for (var i = 0; i < cbs.length; i++) { 68 //4.设置这些cbs[i]的checked状态 = firstCb.checked 69 cbs[i].checked = this.checked; 70 } 71 } 72 } 73 </script> 74 </head> 75 <body> 76 <div class="container"> 77 <h3 style="text-align: center">用户信息列表</h3> 78 79 <div style="float: left;"> 80 81 <form class="form-inline" action="${pageContext.request.contextPath}/findUserByPageServlet" method="post"> 82 <div class="form-group"> 83 <label for="exampleInputName2">姓名</label> 84 <input type="text" name="name" value="${condition.name[0]}" class="form-control" id="exampleInputName2" > 85 </div> 86 <div class="form-group"> 87 <label for="exampleInputName3">籍贯</label> 88 <input type="text" name="address" value="${condition.address[0]}" class="form-control" id="exampleInputName3" > 89 </div> 90 91 <div class="form-group"> 92 <label for="exampleInputEmail2">邮箱</label> 93 <input type="text" name="email" value="${condition.email[0]}" class="form-control" id="exampleInputEmail2" > 94 </div> 95 <button type="submit" class="btn btn-default">查询</button> 96 </form> 97 98 </div> 99 100 <div style="float: right;margin: 5px;"> 101 102 <a class="btn btn-primary" href="${pageContext.request.contextPath}/add.jsp">添加联系人</a> 103 <a class="btn btn-primary" href="javascript:void(0);" id="delSelected">删除选中</a> 104 105 </div> 106 <form id="form" action="${pageContext.request.contextPath}/delSelectedServlet" method="post"> 107 <table border="1" class="table table-bordered table-hover"> 108 <tr class="success"> 109 <th><input type="checkbox" id="firstCb"></th> 110 <th>编号</th> 111 <th>姓名</th> 112 <th>性别</th> 113 <th>年龄</th> 114 <th>籍贯</th> 115 <th>QQ</th> 116 <th>邮箱</th> 117 <th>操作</th> 118 </tr> 119 120 <c:forEach items="${pb.list}" var="user" varStatus="s"> 121 <tr> 122 <td><input type="checkbox" name="uid" value="${user.id}"></td> 123 <td>${s.count}</td> 124 <td>${user.name}</td> 125 <td>${user.gender}</td> 126 <td>${user.age}</td> 127 <td>${user.address}</td> 128 <td>${user.qq}</td> 129 <td>${user.email}</td> 130 <td><a class="btn btn-default btn-sm" href="${pageContext.request.contextPath}/findUserServlet?id=${user.id}">修改</a> 131 <a class="btn btn-default btn-sm" href="javascript:deleteUser(${user.id});">删除</a></td> 132 </tr> 133 </c:forEach> 134 135 136 </table> 137 </form> 138 <div> 139 <nav aria-label="Page navigation"> 140 <ul class="pagination"> 141 <c:if test="${pb.currentPage == 1}"> 142 <li class="disabled"> 143 </c:if> 144 145 <c:if test="${pb.currentPage != 1}"> 146 <li> 147 </c:if> 148 <a href="${pageContext.request.contextPath}/findUserByPageServlet?currentPage=${pb.currentPage - 1}&rows=5&name=${condition.name[0]}&address=${condition.address[0]}&email=${condition.email[0]}" aria-label="Previous"> 149 <span aria-hidden="true">«</span> 150 </a> 151 </li> 152 153 <c:forEach begin="1" end="${pb.totalPage}" var="i" > 154 <c:if test="${pb.currentPage == i}"> 155 <li class="active"><a href="${pageContext.request.contextPath}/findUserByPageServlet?currentPage=${i}&rows=5&name=${condition.name[0]}&address=${condition.address[0]}&email=${condition.email[0]}">${i}</a></li> 156 </c:if> 157 <c:if test="${pb.currentPage != i}"> 158 <li><a href="${pageContext.request.contextPath}/findUserByPageServlet?currentPage=${i}&rows=5&name=${condition.name[0]}&address=${condition.address[0]}&email=${condition.email[0]}">${i}</a></li> 159 </c:if> 160 </c:forEach> 161 162 <li> 163 <a href="${pageContext.request.contextPath}/findUserByPageServlet?currentPage=${pb.currentPage + 1}&rows=5&name=${condition.name[0]}&address=${condition.address[0]}&email=${condition.email[0]}" aria-label="Next"> 164 <span aria-hidden="true">»</span> 165 </a> 166 </li> 167 <span style="font-size: 25px;margin-left: 5px;"> 168 共${pb.totalCount}条记录，共${pb.totalPage}页 169 </span> 170 </ul> 171 </nav> 172 </div> 173 </div> 174 </body> 175 </html>
2.Servlet
1 package cn.itcast.web.servlet; 2 3 import cn.itcast.domain.PageBean; 4 import cn.itcast.domain.User; 5 import cn.itcast.service.UserService; 6 import cn.itcast.service.impl.UserServiceImpl; 7 8 import javax.servlet.ServletException; 9 import javax.servlet.annotation.WebServlet; 10 import javax.servlet.http.HttpServlet; 11 import javax.servlet.http.HttpServletRequest; 12 import javax.servlet.http.HttpServletResponse; 13 import java.io.IOException; 14 import java.util.Map; 15 16 @WebServlet("findUserByPageServlet") 17 public class FindUserByPageServlet extends HttpServlet { 18 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 19 request.setCharacterEncoding("utf-8"); 20 21 //1.获取参数 22 String currentPage = request.getParameter("currentPage");//当前页码 23 String rows = request.getParameter("rows");//每页显示条数 24 25 if(currentPage == null || "".equals(currentPage)){ 26 currentPage = "1"; 27 } 28 if(rows == null || "".equals(rows)){ 29 rows = "5"; 30 } 31 32 //获取条件查询参数 33 Map<String, String[]> condition = request.getParameterMap(); 34 35 //2.调用service查询 36 UserService service = new UserServiceImpl(); 37 PageBean<User> pb = service.findUserByPage(currentPage,rows,condition); 38 39 System.out.println(pb); 40 41 //3.将PageBean存入request 42 request.setAttribute("pb",pb); 43 request.setAttribute("condition",condition);//将查询条件存入request 44 //4.转发到list.jsp 45 request.getRequestDispatcher("/jsp/list.jsp").forward(request,response); 46 } 47 48 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 49 this.doPost(request, response); 50 } 51 }
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