Question

I am developing a web application using JSP and Servlets.
In that application I have to show data from database table stud(studID, name, add) in html table, And each row in the table will have a hyperlink associated with it at the last column. After clicking on that hyperlink I wants to get the (studID) from the table…

so far I have done getting the data from database and then putting it into the column and then adding hyperlink for each row.. But I am not able to get the (studID) from the html table associated with hyperlink..

Thanks in advance….

Source code :

<% 
String[][] data = (String[][])request.getAttribute("data"); 
String[] cNames = (String[])request.getAttribute("columnNames"); 
//headings 
%> 
<table> 
<tr> 
<% 
for(int i=0;i<cNames.length;i++) { 
%> 
<th>
<%= cNames[i] %>
</th>
<% 
} 

//data if(data!=null) 
for(int i=0;i<data.length;i++) { 
%>
<tr> 
<% 
for(int a=0;a<3;a++) {
%> 
<td>
<%= 
data[i][a] 
%>
</td> 
<% 
//hyperlink 
if(a==2) { 
%> 
<td>
<a href="PlanProtocol" id=<%=i%> onclick="<% session.setAttribute("ID","p2"); %>" >Edit</a></td> 
<% 
} 
} 
%>
</tr> 
<% } %> 
<tr>
</table>

Answer 1

You can pass the id as a query string in the url. Simply:

  <a href="myservlet?id=<%=stuid%>">My Link</a>

Will work. But if you are using JSTL or another tag library then you can do something like this:

  <c:url value="/myservlet" var="myURL">
     <c:param name="id" value="1234"/>
  </c:url>

  <a href="<c:out value="myURL">mylink</a>

And this has its advantages such as url encoding etc.

---

So to add the id to the URL in your posted code you can:

  <a href="PlanProtocol?id=<%=i%>" >Edit</a>

And the url will end up like this: PlanProtocol?id=1234.

In the Servlet you can get the Parameter by:

   request.getParameter("i");

However, as I mentioned above, you probably want to use a tag library like the JSTL rather than placing these scriptlets in your page. There are several advantages.