This discussion is archived
5 Replies Latest reply: Sep 5, 2012 10:01 AM by DrClap RSS

jsp forEach map

960113 Newbie
Currently Being Moderated
Hello



my english is not super.



i got a problem (that's why i'm here ;) )


i got a map => Map<Long, Articles> articleMap

the key => Long, is the numbers of articles that the client want to buy.
in Articles, i got getName,getPrice, etc...


my problem is that i don't know how i can show these informations in a servlet.



a client can buy different articles. and he can buy 1, 2 or more of the same article (Quantity)
i need to show in a JPS, all the articles (information => getName, getPrice, get....) that he want to buy with the quantity that he want.



session.setAttribute ("ArticleMap", articleMap)




<c:forEach var="article" items="${ArticleMap}">
????


</forEach>


or if it's not possible what should i do?


i hope to get a response asp, it's urgent... ;)


thx
  • 1. Re: jsp forEach map
    ramp Explorer
    Currently Being Moderated
    >
    >
    or if it's not possible what should i do?
    For starters, how about reversing the key and value in that map of yours and see where it takes you ?

    map => Map<Articles, Long> articleMap

    >
    i hope to get a response asp, it's urgent... ;)
    When is it not to the person who is asking?
  • 2. Re: jsp forEach map
    960113 Newbie
    Currently Being Moderated
    why should i change it?

    map => Map<Articles, Long> articleMap


    is it possible that u show me with a example how i can get to that map in the jsp to show all the information (Articles => getName, getPrice, etc..) and the Log (amount) with the <c:forEach>
    i don't understand how i can show these informations
    thx
  • 3. Re: jsp forEach map
    ramp Explorer
    Currently Being Moderated
    957110 wrote:
    why should i change it?
    Have you thought how many entries would there be in your map if the user decides to purchase an equal number of different articles?
    map => Map<Articles, Long> articleMap


    is it possible that u show me with a example how i can get to that map in the jsp to show all the information (Articles => getName, getPrice, etc..) and the Log (amount) with the <c:forEach>
    i don't understand how i can show these informations
    thx
    A google search will show you how to use jstl to iterate over a map. I would suggest you try it yourself first and come back here with questions if you are stuck.
  • 4. Re: jsp forEach map
    960113 Newbie
    Currently Being Moderated
    i know how to iterate a map


    example:

    for (Map.Entry<Long, Long> map : ArticleMap.entrySet()) {

                   Value = map.getValue());
                   key =map.getKey();
                   
    }


    can i iterate a Map<Long, articlemap> in a jsp?

    i can iterate in a jsp a simple map (<long, long) but in don't know how do iterate (c:foreach) a map<long, othermap>

    Edited by: 957110 on 5-sep-2012 8:15
  • 5. Re: jsp forEach map
    DrClap Expert
    Currently Being Moderated
    Well, like ramp said, you have your keys and values the wrong way around. If your customer orders 2 shirts and 2 hats, what's in your Map?

    But the real problem is that you didn't do a proper design, and short-cut the process by using a Map. You should have a list of, let's say, Order objects, where an Order contains an Article and a quantity. It's easy to iterate a list.

    However if you still have more time to spend on doing it wrong, the answer is in the JSTL spec. Section 6.1.2 to be specific.

Legend

  • Correct Answers - 10 points
  • Helpful Answers - 5 points