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Java Articles
Page 418 of 450
What is a buffer attribute in JSP?
The buffer attribute specifies the buffering characteristics for the server output response object.You may code a value of "none" to specify no buffering so that the servlet output is immediately directed to the response object or you may code a maximum buffer size in kilobytes, which directs the servlet to write to the buffer before writing to the response object.To direct the servlet to write the output directly to the response output object, use the following −Use the following to direct the servlet to write the output to a buffer of size not less than 8 kilobytes −
Read MoreWhat happens when buffer is set to a value "none" in JSP?
The buffer attribute specifies the buffering characteristics for the server output response object.You may code value of "none" to specify no buffering so that the servlet output is immediately directed to the response object or you may code a maximum buffer size in kilobytes, which directs the servlet to write to the buffer before writing to the response object.To direct the servlet to write the output directly to the response output object, use the following −
Read MoreWhat is autoFlush attribute in JSP?
The autoFlush attribute 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.A value of true (default) indicates automatic buffer flushing and a value of false throws an exception.The following directive causes the servlet to throw an exception when the servlet's output buffer is full −This directive causes the servlet to flush the output buffer when full −Usually, the buffer and the autoFlush attributes are coded on a single page directive as follows −
Read MoreWhat is contentType attribute in JSP?
The contentType attribute sets the character encoding for the JSP page and for the generated response page. The default content type is text/html, which is the standard content type for HTML pages.If you want to write out XML from your JSP, use the following page directive −The following statement directs the browser to render the generated page as HTML −The following directive sets the content type as a Microsoft Word document −You can also specify the character encoding for the response. For example, if you wanted to specify that the resulting page that is returned to the browser uses ISO ...
Read MoreWhat is errorPage attribute in JSP?
The errorPage attribute tells the JSP engine which page to display if there is an error while the current page runs. The value of the errorPage attribute is a relative URL.The following directive displays MyErrorPage.jsp when all uncaught exceptions are thrown −The isErrorPage attribute indicates that the current JSP can be used as the error page for another JSP.The value of isErrorPage is either true or false. The default value of the isErrorPage attribute is false.For example, handleError.jsp sets the isErrorPage option to true because it is supposed to handle errors −
Read MoreHow to send an error code using JSP to browser?
Following example shows how a 407 error code is sent to the client browser. After this, the browser would show you "Need authentication!!!" message. Setting HTTP Status Code You will receive the following output −HTTP Status 407 - Need authentication!!! type Status report message Need authentication!!! description The client must first authenticate itself with the proxy (Need authentication!!!). Apache Tomcat/5.5.29
Read MoreWhat are important server response headers that are useful in web programming?
Following is a summary of the most useful HTTP 1.1 response headers which go back to the browser from the web server. These headers are frequently used in web programming −Sr.No.Header & Description1AllowThis header specifies the request methods (GET, POST, etc.) that the server supports.2Cache-ControlThis header specifies the circumstances in which the response document can safely be cached. It can have values public, private or no-cache etc. Public means document is cacheable, Private means document is for a single user and can only be stored in private (nonshared) caches and no-cache means document should never be cached.3ConnectionThis header instructs the ...
Read MoreWhat is import attribute in JSP?
The import attribute serves the same function as and behaves like, the Java import statement. The value for the import option is the name of the package you want to import.To import java.sql.*, use the following page directive −To import multiple packages, you can specify them separated by comma as follows −By default, a container automatically imports java.lang.*, javax.servlet.*, javax.servlet.jsp.*, and javax.servlet.http.*.
Read MoreWhat is difference between GET and POST method in HTTP protocol?
GET methodThe GET method sends the encoded user information appended to the page request. The page and the encoded information are separated by the ? character as follows −http://www.test.com/hello?key1=value1&key2=value2The GET method is the default method to pass information from the browser to the web server and it produces a long string that appears in your browser's Location:box. It is recommended that the GET method is better not used. if you have a password or other sensitive information to pass to the server.The GET method has size limitation: only 1024 characters can be in a request string.This information is passed using ...
Read MoreHow to read form data using JSP?
JSP handles requests using getParameter() method to read simple parameters and getInputStream() method to read binary data stream coming from the client.Reading Form Data using JSPJSP handles form data parsing automatically using the following methods depending on the situation −getParameter(): You call request.getParameter() method to get the value of a form parameter.getParameterValues(): Call this method if the parameter appears more than once and returns multiple values, for example, checkbox.getParameterNames(): Call this method if you want a complete list of all parameters in the current request.getInputStream(): Call this method to read binary data stream coming from the client.
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