getting session variables from session

I am getting the below error when I compile the below code

Enumeration e = bean.getSession().getAttributeNames(); 
        while (e.hasMoreElements()) { 
        String name = (String)e.nextElement(); 
        String value = session.getAttribute(name).toString(); 
        System.out.println(name + " = " + value); 

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Error:
found   : java.util.Iterator
requ开发者_如何学Pythonired: java.util.Enumeration
        Enumeration e = bean.getSession().getAttributeNames(); 

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You shouldn't be using an enumeration, it should be an Iterator. Then use the methods of the Iterator like hasNext() to check if there is a next item and next() to get the next item. Hope it helps :)

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how about just using a for loop?

for (String name : bean.getSession().getAttributeNames() ) {
    String value = session.getAttribute(name).toString();
    System.out.println( name + " = " + value );
}

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It looks like you're actually using a getAttributeNames() method that return an instance of java.util.Iterator. So as a quick fix, this should work:

Iterator it = bean.getSession().getAttributeNames(); 
while (it.hasNext()) { 
    String name = (String)it.next(); 
    String value = session.getAttribute(name).toString(); 
    System.out.println(name + " = " + value);

More help/info could be provided if we knew the actual types of the bean variable and/or the return value of bean.getSession().

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I think the problem is in the first line. This works for me:

<%
    Enumeration attrs = session.getAttributeNames(); //you will need to include java.util.Enumeration
    while(attrs.hasMoreElements()){ //for each item in the session array
        String id = attrs.nextElement().toString(); //the name of the attribute
        out.print("'" + id + "': '" + session.getAttribute(id) + "'"); //print out the key/value pair
    }
%>

As others pointed out though, you should be using an Iterator