java - Assigning a HashMap to a variable within JSP -

java - Assigning a HashMap to a variable within JSP -

i have controller servlet creating object , placing hashmap , i'm forwarding jsp attribute, in jsp wish set hashmap variable, how able this?

see code below:

controllerservlet

map<integer, post> posts = new hashmap<integer, post>(); // needs refactoring db query post p = new post(); p.setid(1); p.settitle("hello world!"); p.setbody("this first blog post!"); p.setauthor("jacob clark"); p.setpublished(new date()); posts.put(p.getid(), p); getservletcontext().setattribute("posts", posts); requestdispatcher rd = getservletcontext().getrequestdispatcher("/web-inf/index.jsp"); rd.forward(request, response);

jsp

getservletcontext().getattribute("posts")

please not utilize servletcontext communicate between servlet , jsp page ! you'd improve utilize request attributes usage, servletcontext attributes mutual servlets , sessions.

in controller utilize :

request.setattribute("posts", posts); requestdispatcher rd = getservletcontext().getrequestdispatcher("/web-inf/index.jsp"); rd.forward(request, response);

then in jsp :

<jsp:usebean name="posts" scope="request" class="java.util.map"/> ${posts["1"].title}

you can iterate on map <c:foreach> jstl tag, unless map in linkedhashmap or treemap order of iteration unspecified. illustration :

<table><tr><th>title</th><th>author</th><tr> <c:foreach var="entry" items="${posts}"> <!-- key ${entry.key} value ${entry.value} --> <tr><td>${entry.value.title}</td><td>${entry.value.author}</td></tr> </c:foreach> </table>

java jsp servlets