Best Practices in Java EE Web Development - Learn Java for Web Development - page 123

Listing 3-26 illustrates accessing a header named user-agent , using the expression
${header.user-agent} or ${header["user-agent"]} .
Listing 3-26. Using EL Implicit Object Header
<span>${header["user-agent"]}</span>
Here's the output:
Mozilla/5.0 (Windows NT 6.1; rv:12.0) Gecko/20100101 Firefox/12.0
Accessing Cookie
The El implicit object cookie gives us access to the cookie. Listing 3-27 illustrates the cookie stored
in the servlet.
Listing 3-27. Setting a Cookie in a Servlet
1.String userName = "vishal";
2.Cookie c = new Cookie("userName", userName);
3.c.setPath("/");
4.response.addCookie(c);
Listing 3-28 illustrates how to use an EL implicit object to access the cookie in the JSP page.
Listing 3-28. Using an EL Implicit Object Cookie
${cookie.userName.value}
Accessing a Scoped Attribute
The El implicit object sessionScope gives access to the attribute stored in the session scope.
Listing 3-29 illustrates the attribute stored in the session in a servlet.
Listing 3-29. Setting a Session Attribute in a Servlet
HttpSession session = request.getSession();
Book book = new Book();
book.setBookTitle("Beginning Java");
session.setAttribute("book", book);
Listing 3-30 illustrates using an EL implicit object called sessionScope to access the book title in the
JSP page.
Listing 3-30. Using EL Implicit Object sessionScope
<span>Book title in Session Scope ${sessionScope.book.bookTitle}</span>