JavaWeb--MVC案例1-------(5)添加

 

 

1.在index的表单中转向newCustomer.jsp

  <form action="query.do", method="post ">
    <table>
      <tr>
        <td>Name:</td>
        <td><input type="text", name="name"/></td>
      </tr>

      <tr>
        <td>Address:</td>
        <td><input type="text", name="address"/></td>
      </tr>

      <tr>
        <td>Phone:</td>
        <td><input type="text", name="phone"</td>
      </tr>

      <tr>
        <td><input type="submit", value="Query"/></td>
        <td><a href="newCustomer.jsp">Create New Customer</a></td>

      </tr>
    </table>
  </form>

  2.newCustomer.jsp中进行

<%@ page import="MVCCases.Customer" %>
<%@ page import="java.util.List" %><%--
  Created by IntelliJ IDEA.
  User: Skye
  Date: 2017/12/11
  Time: 9:46
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>

<%
    Object message = request.getAttribute("message");

    if(message!= null){
        %>
        <br>
        <font color="red"><%=message%></font>
        <br>
        <br>
        <br>
<%
    }
%>
<form action="add.do" method="post">
<table>

    <tr>
        <td>CustomerName:</td>
        <td><input type="text" name="name" value="<%=request.getParameter("name") == null ? "" : request.getParameter("name")%>"/></td>
    </tr>

    <tr>
        <td>Address</td>
        <td><input type="text" name="address" value="<%=request.getParameter("address") == null ? "" : request.getParameter("address")%>"/></td>
    </tr>

    <tr>
        <td>Phone</td>
        <td><input type="text" name="phone" value="<%=request.getParameter("phone") == null ? "" : request.getParameter("phone")%>"</td>
    </tr>

    <tr>
        <%--colspan="2"用来指定单元格横向跨越的列数  横跨两列--%>
        <%--rowspan的作用是指定单元格纵向跨越的行数--%>
        <td colspan="2"><input type="submit" value="Submit"/></td>
    </tr>

</table>

</body>
</html>

  3.CustomerServlet中进行add()方法的编写

注意区分有无重复姓名,若有则进行转发,若么有,则进行重定向

private void add(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        //1.获取添加的顾客的信息
        String name = req.getParameter("name");
        String address = req.getParameter("address");
        String phone = req.getParameter("phone");

        long count = customerDAO.getCountWithName(name);
        if(count > 0){
            req.setAttribute("message", "用户名" + name + "已被占用");

            req.getRequestDispatcher("/newCustomer.jsp").forward(req, resp);
            return;
        }

        //2.创建一个Customer对象
        Customer customer = new Customer(name, address, phone);

        customerDAO.save(customer);

        //若添加成功,则重定向到成功页面
        resp.sendRedirect("success.jsp");

    }

  5.重定向的success.jsp

<%@ page import="MVCCases.Customer" %>
<%@ page import="java.util.List" %><%--
  Created by IntelliJ IDEA.
  User: Skye
  Date: 2017/12/11
  Time: 9:19
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <h4>操作成功</h4>
    <h4><a href="index.jsp">return!</a></h4>

</body>
</html>

  

posted @ 2017-12-10 23:46  SkyeAngel  阅读(219)  评论(0编辑  收藏  举报