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Java Server Page JSP - Coggle Diagram

- - - - HttpServletRequest object associated with the request
 - - HttpServletResponse object associated with the response to the client.
 - - PrintWriter object used to send output to the client
 - - HttpSession object associated with the request
 - - ServletContext object associated with the application context
 - - ServletConfig object associated with the page
 - - This encapsulates use of server-specific features like higher performance JspWriters
 - - This is simply a synonym for this, and is used to call the methods defined by the translated servlet class
 - - Exception object allows the exception data to be accessed by designated JSP
- - - - can dynamically insert a file
 - forward the user to another page
 - generate HTML for the Java plugin.
 - reuse JavaBeans components
 - - jsp:include
 
 example ; <jsp:include page = "date.jsp" flush = "true" />
 - jsp:useBean
 
 example ; <jsp:useBean id = "name" class = "package.class" />
 - jsp:setProperty
 
 example ; <<jsp:setProperty name = "myName" property = "someProperty" .../>
 - jsp:forward
 
 example ; <jsp:forward page = "Relative URL" />
 - jsp:plugin
 
 <jsp:param name = "background" value = "black" />
 
 <jsp:plugin type = "applet" codebase = "dirname" code = "MyApplet.class"
 
 <jsp:fallback> Unable to initialize Java Plugin</jsp:fallback>
 
 </jsp:plugin>
 - jsp:element
 
 <jsp:element name = "xmlElement"> </jsp:element>
 - jsp:attribute
 
 <jsp:attribute name = "xmlElementAttr">
 Value for the attribute
 </jsp:attribute>
 - jsp:body
 
 <jsp:body>
 Body for XML element
 </jsp:body>
 - jsp:text
 
 <jsp:text>Template data</jsp:text>
- - - - Page
 
 %@ page attributes="" %>
 
 To provide instructions to the container.
 
 Attributes
 
 autoFlush
 
 Specifies whether the buffered output should be flushed automatically when the buffer is filled, or whether an exception should be raised to indicate the buffer overflow.
 
 contentType
 
 Defines the MIME(Multipurpose Internet Mail Extension) type of the HTTP response.The default value is "text/html;charset=ISO-8859-1"
 
 buffer
 
 Sets the buffer size in kilobytes to handle output generated by the JSP page.The default size of the buffer is 8Kb.
 
 errorPage
 
 Declare that the current page is the error page.
 
 isErrorPage
 
 Define the error page, if exception occurs in the current page, it will be redirected to the error page.
 
 import
 
 import class,interface or all the members of a package.It is similar to import keyword in java class or interface.
 
 extends
 
 Defines the parent class that will be inherited by the generated servlet.It is rarely used
 
 info
 
 Sets the information of the JSP page which is retrieved later by using getServletInfo() method of Servlet interface.
 
 isThreadSafe
 
 Servlet and JSP both are multithreaded.If you want to control this behaviour of JSP page, you can use isThreadSafe attribute of page directive.The value of isThreadSafe value is true.If you make it false, the web container will serialize the multiple requests, i.e. it will wait until the JSP finishes responding to a request before passing another request to it.
 
 language
 
 Specifies the scripting language used in the JSP page. The default value is "java".
 
 session
 
 Defines the MIME(Multipurpose Internet Mail Extension) type of the HTTP response.The default value is "text/html;charset=ISO-8859-1"
 
 isELIgnored
 
 Ignore the Expression Language (EL) in jsp by the isELIgnored attribute. By default its value is false.
 
 isScriptingEnabled
 
 Determines if the scripting elements are allowed for use.
 - Include
 
 <%@ include file = "relative url" %>
 
 To include a file during the translation phase.
 
 commonly used to include a jsp or html file
- - - - syntax : <%= expression %> in JSP. Eg <%=k%> will be converted to...
 
 Converts into out.println(k); in servlet
 - inserted into the output (String conversion)
 - Evaluation is performed at run-time (when the page
 is requested)
 - Example: Current time: <%= new java.util.Date() %>
 
 Can use Implicit Objects to simplify expressions
 
 Example:
 
 Your hostname: <%= request.getRemoteHost() %>
 
 Importants are :!: :Request, Response, Session, Out
 - - Syntax: <% Java Code; %>
 
 Example, Use out variable to display output in page
 
 <% String queryData = request.getQueryString();
 out.println("Attached GET data: " + queryData); %>
 
 Example: <% if (Math.random() < 0.5)
 { %> Have a nice day! <% } else { %> Have a lousy day! <% } %>
 
 converts to: if (Math.random() < 0.5) {
 out.println("Have a nice day!");
 } else {
 out.println("Have a lousy day!");
 }
 - inserted into servlet service method
 - - Syntax : <%! code %>
 
 Declarations do not generate any Output
 
 Normally used in conjunction with JSP expressions or
 scriptlets
 
 Examples:
 
 <%! String nome=“pippo”; %>
 
 <%! public String getName() {return nome;} %>
 - Inserted into the body of the servlet class
 - Define class-wide variables and methods in the generated
 servlet.
 - initialized when the JSP page is initialized.