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PMP 1600 Questions
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  • JSP Scripting Elements :Scriptlet, expression, declaration

    JSP Scripting Elements :Scriptlet, expression, declaration
    There are three Scripting Elements
    1. Expressions of the form <%= expression %> that are evaluated and inserted into the output,
    A JSP expression is used to insert Java values directly into the output. It has the following form:
    <%= Java expression %>
    The Java expression is evaluated, converted to a string, and inserted in the page
    Current time: <%= new java.util.Date() %>
    predefined variables that you can use
    request, the HttpServletRequest;
    response, the HttpServletResponse;
    session, the HttpSession associated with the request (if any); and
    out, the PrintWriter (a buffered version of type JspWriter) used to send output to the client.
    Example :Your hostname: <%= request.getRemoteHost() %>
    2. Scriptlets of the form <% code %> that are inserted into the servlet's service method, and
    If you want to do something more complex than insert a simple expression, JSP scriptlets insert code into the service() method of the generated servlet.
    Scriptlets have the following form:
    <% Java Code %> Scriptlets have access to the same automatically defined variables as expressions
    <%
    String name = request.getParameter("name");
    out.println("name: " + name);
    %>

    3. Declarations of the form <%! code %> that are inserted into the body of the servlet class, outside of any existing methods.
    A JSP declaration define methods or fields that get inserted into the main body of the servlet class (outside of the service method processing the request). It has the following form:

    <%! Java Code %> 
    or <%!
    public int getValue(){
    return 78;
    }
    %>
    The method we can use in Expression also. <%=getValue()%>

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