Found 9326 Articles for Object Oriented Programming

Following table lists out the attributes associated with the page directive −S.No.Attribute & Purpose1bufferSpecifies a buffering model for the output stream.2autoFlushControls the behavior of the servlet output buffer.3contentTypeDefines the character encoding scheme.4errorPageDefines the URL of another JSP that reports on Java unchecked runtime exceptions.5isErrorPageIndicates if this JSP page is a URL specified by another JSP page's errorPage attribute.6extendsSpecifies a superclass that the generated servlet must extend.7importSpecifies a list of packages or classes for use in the JSP as the Java import statement does for Java classes.8infoDefines a string that can be accessed with the servlet's getServletInfo() method.9isThreadSafeDefines the threading model ... Read More

The page directive is used to provide instructions to the container. These instructions pertain to the current JSP page. You may code page directives anywhere in your JSP page. By convention, page directives are coded at the top of the JSP page.Following is the basic syntax of the page directive −You can write the XML equivalent of the above syntax as follows −AttributesFollowing table lists out the attributes associated with the page directive −S.No.Attribute & Purpose1bufferSpecifies a buffering model for the output stream.2autoFlushControls the behavior of the servlet output buffer.3contentTypeDefines the character encoding scheme.4errorPageDefines the URL of another JSP that ... Read More

You can make use of JSTL tags to write an error page ShowError.jsp with better structure and more information −           Show Error Page               Opps...                             Error:             ${pageContext.exception}                                 URI:             ${pageContext.errorData.requestURI}                             ... Read More

JSP gives you an option to specify Error Page for each JSP using page attribute. Whenever the page throws an exception, the JSP container automatically invokes the error page.Following is an example to specifiy an error page for a main.jsp. To set up an error page, use the directive.           Error Handling Example               We will now write one Error Handling JSP ShowError.jsp, which is given below. Notice that the error-handling page includes the directive . This directive causes the JSP compiler ... Read More

The exception object is a wrapper containing the exception thrown from the previous page. It is typically used to generate an appropriate response to the error condition.When you are writing a JSP code, you might make coding errors which can occur at any part of the code. There may occur the following type of errors in your JSP code −Checked exceptionsA checked exception is an exception that is typically a user error or a problem that cannot be foreseen by the programmer. For example, if a file is to be opened, but the file cannot be found, an exception occurs. ... Read More

JSP gives you an option to specify Error Page for each JSP using page attribute. Whenever the page throws an exception, the JSP container automatically invokes the error page.Following is an example to specifiy an error page for a main.jsp. To set up an error page, use the directive.                 Error Handling Example               We will now write one Error Handling JSP ShowError.jsp, which is given below. Notice that the error-handling page includes the directive . This directive causes ... Read More

This object is an actual reference to the instance of the page. It can be thought of as an object that represents the entire JSP page.The page object is really a direct synonym for the this object.

The if...else block starts out as an ordinary Scriptlet, but the Scriptlet is closed at each line with HTML text included between the Scriptlet tags.Example Live Demo           IF...ELSE Example                         Today is weekend                 Today is not weekend           The above code will generate the following result −Today is not weekend

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The pageContext object is an instance of a javax.servlet.jsp.PageContext object. The pageContext object is used to represent the entire JSP page.This object is intended as a means to access information about the page while avoiding most of the implementation details.This object stores references to the request and response objects for each request. The application, config, session, and out objects are derived by accessing attributes of this object.The pageContext object also contains information about the directives issued to the JSP page, including the buffering information, the errorPageURL, and page scope.The PageContext class defines several fields, including PAGE_SCOPE, REQUEST_SCOPE, SESSION_SCOPE, and APPLICATION_SCOPE, ... Read More