Using the Parameter twice in a jsp page
I need to use a parameter twice I am really new to this and I know very little
about java I need to use it where I put HERE can anyone help me!
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<%@page import="java.sql.*"%>
<%@page import="java.util.*"%>
<jsp:useBean id="dbset" class="Beans.dbset" />
<html>
<body>
<%String res = request.getParameter("image_id");
String sql = "SELECT DISTINCT episode_id, episode_date, link FROM episode_char_Query where character_id = " + res ;
dbset.setQuery(sql);%>
<table>
<%
Vector outvec = new Vector();
Vector invec = new Vector();
outvec = dbset.getResults();
invec = (Vector)outvec.elementAt(1);
for(int i=0; i<outvec.size(); i++)
%>
<tr>
<%
for(int j=0; j<invec.size(); j++)
if(i!=0 && j==0)
%> <td align="center">
<a href="episode.jsp?episode_id=<%=((Vector)outvec.elementAt(i)).elementAt(0).toString() %>&character_id ="HERE/>Click here to show scenes</a>
</td>
<% }
if(i!=0 && j==2)
%> <td align="center">
<a href='C:\eastenders\<%=((Vector)outvec.elementAt(i)).elementAt(2).toString() %>'/>Click here to play episode</a>
</td>
<% }
else
%> <td align="center">
<%= ((Vector)outvec.elementAt(i)).elementAt(j).toString() %>
</td>
<% }
%>
</tr>
<%
%>
</table>
</body>
</html>
um.
yuck.
I would suggest you use some JSTL.
Mixing html and scriptlet code like this is a recipe for disaster:
And whats with all this if j==1, j==2 crap?
Seeing as you only have three items being returned, it would be much simpler just to have one loop, and access vector elements 0,1,2 directly rather than having a double loop.
At LEAST pull some of the stuff into temporary variables.
<c:forEach var="episode" items="${outvec}" varStatus="status">
<c:choose>
// first line is headings?
<c:when test="${status.first}">
<td align="center">${episode[0]}</td>
<td align="center">${episode[1]}</td>
<td align="center">${episode[2]}</td>
</c:when>
// all other lines print the data
<c:otherwise>
<tr>
<td align="center">
<a href="episode.jsp?episode_id=${episode[0]}&character_id=${param.image_id}">Show scene</a>
</td>
<td align="center">${episode[1]}</td>
<td align="center"> <a href='C:\eastenders\${episode[2]}'> play episode </a></td>
</tr>
</c:otherwise>
</c:forEach>You see how much clearer it is without the nested looping and complicated if syntax?
Do yourself a favour - take a step back get JSTL and rewrite it from scratch.
You will be thanking yourself later.
Cheers,
evnafets
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