javascript 将数据从一个jsp页面传递到另一个jsp页面
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Pass Data from one jsp page to another jsp page
提问by nikhil
I have two pages (page1.jsp and page2.jsp). in page1.jsp i retrieve some values from database and display hyperlinks corresponding to those values. Now what i want is when i click any of those hyperlinks, in page2.jsp i should display other fields coressponding to the vlaue from the database. So what i essentially want is when a link is clicked the associated value must be passed to page2.jsp where i query the database to retrieve other fields.
我有两个页面（page1.jsp 和page2.jsp）。在 page1.jsp 中，我从数据库中检索一些值并显示与这些值对应的超链接。现在我想要的是当我单击这些超链接中的任何一个时，在 page2.jsp 中，我应该显示与数据库中的 vlaue 对应的其他字段。所以我本质上想要的是当一个链接被点击时，关联的值必须传递给 page2.jsp，在那里我查询数据库以检索其他字段。
回答by BalusC
when a link is clicked the associated value must be passed to page2.jsp where i query the database to retrieve other fields
单击链接时，必须将关联的值传递给 page2.jsp，在那里我查询数据库以检索其他字段
So, you want to preprocessthe HTTP request before displaying the JSP? For that you need a servlet.
那么，您想在显示 JSP 之前对 HTTP 请求进行预处理吗？为此，您需要一个 servlet。
Assuming that the links in page1.jspare displayed like follows:
假设链接page1.jsp显示如下：
<ul>
<c:forEach items="${ids}" var="id">
<li><a href="page2?id=${id}">View data for ID ${id}</a></li>
</c:forEach>
</ul>
Then you will be able to preprocess the HTTP request in the doGet()method of a HttpServletwhich is listening on an <url-pattern>of /page2:
然后，你就可以进行预处理的HTTP请求doGet()的方法，HttpServlet这是上听<url-pattern>的/page2：
Long id = Long.valueOf(request.getParameter("id"));
Data data = dataDAO.find(id);
request.setAttribute("data", data); // Will be available as ${data} in JSP.
request.getRequestDispatcher("/WEB-INF/page2.jsp").forward(request, response);
In page2.jspyou will be able to access the dataas follows:
在page2.jsp您将能够访问data如下：
<p>The data for ID ${param.id} is:</p>
<p>Field 1: ${data.field1}</p>
<p>Field 2: ${data.field2}</p>
See also:
也可以看看：
- All about Servlets- contains Hello World example and useful links
- 所有关于 Servlets- 包含 Hello World 示例和有用的链接
回答by wajiw
You can do that by either passing GET or POST variables to the corresponding jsp page and reading them using jsp:
您可以通过将 GET 或 POST 变量传递到相应的 jsp 页面并使用 jsp 读取它们来实现：
using GET method:
使用 GET 方法：
<a href="page2.jsp?datatobesend=value">link</a>
If you want to do this dynamically you will have to add to that on click using javascript:
如果您想动态执行此操作，则必须使用 javascript 在点击时添加：
GET using jQuery js library:
使用 jQuery js 库获取：
<script>
$(document).ready(function(){
$('#mylink').click(function(){
$(this).attr('href', $(this).attr('href')+'?datatobesend=value');
});
});
</script>
<a href="page2.jsp" id="mylink">link</a>
There are many ways to use GET/POST to send data from one page to another, this is just as quick as I could write one up :-) Using form submissions are another place you should look into if this way doesn't work out for you.
有很多方法可以使用 GET/POST 将数据从一个页面发送到另一个页面，这和我写一个一样快:-) 使用表单提交是另一个你应该研究的地方，如果这种方式行不通为你。
回答by Juan Mendes
lIf you are talking about a variable that can't be serialized as a string and passed as an http parameter, as suggested, then you need to store the variable within the session.
l如果你说的是一个不能序列化为字符串并作为http参数传递的变量，如建议的那样，那么你需要将变量存储在会话中。
--page1.asp
<?
session.setAttribute( "val", record );
?>
--page2.asp
<?
//Cast this to your type
Object record = session.getAttribute("val");
// Clean it up now that you're done
session.removeAttribute( "val" )
?>
