JavaWeb同步学习笔记之三十三、JavaWeb_MVC案例之删除操作
作者:互联网
JavaWeb_MVC案例之删除操作
MVC案例之删除操作
- 1.删除操作
1)超链接:delete.do?id=<%=customer.getId()%>
2)Servlet 的 delete 方法
①获取 id
②调用 DAO 执行删除
③重定向到 query.do(若目标页面不需要读取当前请求的 request 属性,就可以使用重定向),将显示删除后的 Customer 的 List
3)JSP 上的 jQuery 提示:
确定要删除 xx 的信息吗? - 2.具体代码:
index.jsp
<%@page import="com.xs.mvc_crud.domain.Customer"%>
<%@page import="java.util.List"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<!-------------------导入jquery-1.7.2.js------------------->
<script type="text/javascript" src="scripts/jquery-1.7.2.js"></script>
<!-------------------删除提示信息------------------->
<script type="text/javascript">
$(function () {
$(".delete").click(function name() {
var content = $(this).parent().parent().find("td:eq(1)").text();
var flag = confirm("确定要删除" + content + "的信息吗?");
return flag;
});
});
</script>
</head>
<body>
<form action="query.do" method="post">
<table border="1" cellpadding="10" cellspacing="0">
<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="">Add New Customer</a></td>
</tr>
</table>
</form>
<br>
<br>
<hr>
<br>
<br>
<%
List<Customer> customers = (List<Customer>)request.getAttribute("customer");
if(customers != null && customers.size() > 0) {
%>
<table border="1" cellpadding="10" cellspacing="0">
<tr>
<th>Name</th>
<th>Address</th>
<th>Phone</th>
<th>Edit</th>
<th>Delete</th>
</tr>
<%
for(Customer customer: customers) {
%>
<tr>
<td><%= customer.getName() %></td>
<td><%= customer.getAddress() %></td>
<td><%= customer.getPhone() %></td>
<td><a href="">Edit</a></td>
<td><a class="delete" href="delete.do?id=<%= customer.getId()%>">Delete</a></td>
</tr>
<%
}
%>
</table>
<%
}
%>
</body>
</html>
CustomerServlet中delete()方法的具体实现:
/**
* @Title: delete
* @Description: TODO
* @param request
* @param response
* @return void
* @throws IOException
*/
private void delete(HttpServletRequest request, HttpServletResponse response) throws IOException {
String idStr = request.getParameter("id");
int id = 0;
// try-catch的作用:防止idStr不能转为int类型
// 若不能转则id=0,无法进行任何的删除操作。
try {
id = Integer.parseInt(idStr);
customerDAO.delete(id);
} catch (NumberFormatException e) {
//delete.do?id=xxx,如果xxx参数出现错误,直接重定向到query.do。
response.sendRedirect("query.do");
}
}
标签:do,三十三,JavaWeb,删除,request,MVC,id,delete 来源: https://blog.csdn.net/baidu_38688346/article/details/88368426