A simple question: do i have to close the stream?
do i have to close such input/output stream:
HttpServletRequest.getInputStream()
HttpServletRequest.getReader()
HttpServletResponse.getOutputStream()
HttpServletResponse.getWriter()
and why?
thanks!
i found one reason y we won't close the streams beacause see the example and explanation;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
Obtain an output stream by using the HttpServletResponse object and one of the methods shown in the following two examples:
PrintWriter out = res.getWriter();
ServletOutputStream out = res.getOutputStream();
You can use both PrintWriter and ServletOutputStream in the same servlet (or in another servlet that is included in a servlet). The output of both is written to the same buffer.
Write the contents of the response to the output stream using the print() method. You can use HTML tags in these statements. For example:
out.print("<html><head><title>My Servlet</title>");out.print("</head><body><h1>");out.print("Welcome");out.print("</h1></body></html>");Any time you print data that a user has previously supplied, BEA recommends that you remove any HTML special characters that a user might have entered. If you do not remove these characters, your Web site could be exploited by cross-site scripting. For more information, refer to Securing Client Input in Servlets.
Do not close the output stream by using the close() method, and avoid flushing the contents of the stream. If you do not close or flush the output stream, WebLogic Server can take advantage of persistent HTTP connections, as described in the next step.
Optimize the response.
By default, WebLogic Server attempts to use HTTP persistent connections whenever possible. A persistent connection attempts to reuse the same HTTP TCP/IP connection for a series of communications between client and server. Application performance improves because a new connection need not be opened for each request. Persistent connections are useful for HTML pages containing many in-line images, where each requested image would otherwise require a new TCP/IP connection.
Using the WebLogic Server Administration Console, you can configure the amount of time that WebLogic Server keeps an HTTP connection open.
WebLogic Server must know the length of the HTTP response in order to establish a persistent connection and automatically adds a Content-Length property to the HTTP response header. In order to determine the content length, WebLogic Server must buffer the response. However, if your servlet explicitly flushes the ServletOutputStream, WebLogic Server cannot determine the length of the response and therefore cannot use persistent connections. For this reason, you should avoid explicitly flushing the HTTP response in your servlets.
You may decide that, in some cases, it is better to flush the response early to display information in the client before the page has completed; for example, to display a banner advertisement while some time-consuming page content is calculated. Conversely, you may want to increase the size of the buffer used by the servlet engine to accommodate a larger response before flushing the response. You can manipulate the size of the response buffer by using the related methods of the javax.servlet.ServletResponse interface.
The default value of the WebLogic Server response buffer is 12K and the buffer size is internally calculated in terms of CHUNK_SIZE where CHUNK_SIZE = 4088 or 4Kb; if the user sets 5Kb the server rounds the request up to the nearest multiple of CHUNK_SIZE which is 2. and the buffer is set to 8176 or 8Kb.
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