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Editorial Team
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Asked: 2026-05-25T01:59:23+00:00

<% //Retrieving the Server list from dispatcher Collection<Server> svr = (Collection<Server>)request.getAttribute(stuff); ArrayList<String> serverIds =

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<%
    //Retrieving the Server list from dispatcher
    Collection<Server> svr = (Collection<Server>)request.getAttribute("stuff");

    ArrayList<String> serverIds = new ArrayList<String>();

    for(Server i : svr )
      serverIds.add(i.getId());

    String [] svrIds = new String[svr.size()];
    serverIds.toArray(svrIds);

%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<script type="text/javascript">

    var instanceIds = new Array(<%=svrIds%>);

    //test somethings in there
    alert(instanceIds[0]);


</script>
</head>
</html>
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1 Answer

  1. Editorial Team

    If you want to use Java code to write the code for a Javascript data structure, probably the simplest way to do it is to use a JSON library for Java. A JSON string can be interpreted as Javascript code.

    If you want to use JSON.simple, then there are examples here of how to generate the JSON string:

    http://code.google.com/p/json-simple/wiki/EncodingExamples

    In your code, you should be able to do something like this:

    var instanceIds = <%= JSONValue.toJSONString(serverIds) %>

    You shouldn’t need to convert your ArrayList to a Java array. Note that this function is sensitive to what type you pass into it; an array actually won’t work in this instance.

    Also, to do this you will need to install the JSON.simple JAR file and import org.json.simple.JSONValue in your JSP.

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