The example here is just a simple servlet + JSP and does not use a framework. If struts is used, it only needs to comply with the Action Standard in struts, or simply replace it with the struts tag.
Tomainaction
Public class tomainaction extends httpservlet
{
Private iboarderdao boarddao = new boarddaoimpl ();
Private itopicdao topicdao = new topicdaoimpl ();
Private iuserdao userdao = new userdaoimpl ();
Public void doget (httpservletrequest request, httpservletresponse response) throws servletexception, ioexception
{
// Plate list
List <board> boards = boarddao. getallboard ();
List <integer> COUNT = new arraylist <integer> ();
List <user> Users = new arraylist <user> ();
List <topic> lasttopic = new arraylist <topic> ();
If (null! = Boards)
{
For (board B: boards)
{
// Number of replies
List <topic> topic = topicdao. gettopicbyboardid (B. getborderid ());
If (null! = Topic)
{
Int num = topic. Size ();
Count. Add (Num );
}
Else
{
Count. Add (0 );
}
// Latest update
Topic T = topicdao. getlasttopic (B. getborderid ());
Lasttopic. Add (t );
// Author of the latest update
User u = userdao. getuserbyuid (T. getuid ());
Users. Add (U );
}
Request. setattribute ("Boards", boards );
Request. setattribute ("count", count );
Request. setattribute ("users", users );
Request. setattribute ("lasttopic", lasttopic );
Requestdispatcher Dis = request. getrequestdispatcher ("Main. jsp ");
Dis. Forward (request, response );
}
}
Public void dopost (httpservletrequest request, httpservletresponse response) throws servletexception, ioexception
{
This. doget (request, response );
}
}
Main. jsp
<Body>
<Div id = "Container">
<Div id = "divlogin">
<JSP: Include page = "checuser. jsp"> </jsp: Include>
</Div>
<Div class = "nav">
<Div align = "Left" style = "font-weight: bold"> </div>
</Div>
<Table width = "100%" border = "3" bordercolor = "# d0e3ff"
Style = "font-size: 12px">
<Tr style = "background-color: # f3f8ef">
<TD Height = "22" colspan = "2" class = "noborder">
& Nbsp;
</TD>
<TD width = "11%" style = "border: 0; font-size: 12px">
Number of senders
</TD>
<TD width = "21%" style = "border: 0; font-size: 12px">
Latest update
</TD>
</Tr>
<C: If test = "$ {requestscope. boards! = NULL} ">
<C: foreach Var = "B" items = "$ {requestscope. Boards}" varstatus = "status">
<Tr>
<TD width = "6%" Height = "68">
& Nbsp;
</TD>
& Lt; TD width = "67%" & gt;
<Div align = "Left" class = "bluespan">
& Nbsp;
& Nbsp;
<A href = "tolistaction? Boardid =$ {B. borderid} ">$ {B. bordername} </a>
</Div>
</TD>
<TD>
$ {Requestscope. Count [status. Index]}
</TD>
<TD>
<Br/>
<P align = "Left">
$ {Requestscope. lasttopic [status. Index]. Title}
</P>
<Br/>
<P align = "Left">
$ {Requestscope. Users [status. Index]. Username}
</P>
<Br/>
<P align = "Left">
Modification time:
<Br>
$ {Requestscope. lasttopic [status. Index]. modifytime}
</P>
</TD>
</Tr>
</C: foreach>
</C: If>
</Table>
<Div id = "divcopy">
& Copy; xy-
</Div>
</Div>
</Body>
Checuser. jsp
<% @ Taglib uri = "http://java.sun.com/jsp/jstl/core" prefix = "C" %>
<C: If test = "$ {not empty sessionscope. uinfo}">
<Span style = "color: Blue"> welcome:$ {Sessionscope. uinfo. Username}</Span>
<Span style = "color: Blue"> <a href = "gobackaction"> exit </a> </span>
</C: If>
<C: If test = "$ {empty sessionscope. uinfo}">
<Span style = ""> <a href = "tologinaction"> logon </a> </span>
</C: If>
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