What is servlet response?
When client sends a request to web server, the servlet container creates HttpServletRequest and HttpServletResponse objects and passes them as an argument to the servlet service() method. The response object allows you to format and send the response back to the client.
Should I close HttpServletResponse Outputstream?
The general rule of them is this: if you opened the stream, then you should close it. If you didn’t, you shouldn’t. Make sure the code is symmetric. In the case of HttpServletResponse , it’s a bit less clear cut, since it’s not obvious if calling getOutputStream() is an operation that opens the stream.
What is response setContentType?
setContentType. void setContentType(java.lang.String type) Sets the content type of the response being sent to the client, if the response has not been committed yet. The given content type may include a character encoding specification, for example, text/html;charset=UTF-8 .
What is servlet output stream?
ServletOutputStream class provides a stream to write binary data into the response. It is an abstract class. The getOutputStream() method of ServletResponse interface returns the instance of ServletOutputStream class. It may be get as: ServletOutputStream out=response.
What is request and response in java?
request: This is the object of HttpServletRequest class associated with the request. response: This is the object of HttpServletResponse class associated with the response to the client. config: This is the object of ServletConfig class associated with the page. The exception implicit object is of type java.
Which method is responsible for writing the reply in Servlet?
Answer Sheet
| Question Number | Answer Key |
|---|---|
| 11 | A |
| 12 | C |
| 13 | A |
| 14 | B |
Should I close ServletOutputStream?
I don’t think web app developers need to close ServletOutputStream or PrintWriter in servlet classes. They are created and managed by the web container, and web components should not interfere with its lifecycle. In short, don’t close servlet OutputStream or PrintWriter , just as you won’t close System.
What is request and response in Servlet?
The container passes the ServletRequest and the ServletResponse objects as an argument to the service() method of a corresponding servlet. The ServletRequest object contains header and body information of data that come with request.
What is getWriter in Servlet?
getWriter() method for the response obj that gets us the stream on which we can write our output. response. getWriter() returns a PrintWriter object that can send character text to the client. Calling flush() on the PrintWriter commits the response.
What is generic servlet and HTTP servlet?
The main difference between GenericServlet and HttpServlet is that the GenericServlet is protocol independent that can be used with any protocol such as HTTP, SMTP, FTP, CGI etc. while HttpServlet is protocol dependent and is only used with HTTP protocol.
What is HTTP request and response in servlet?
HTTP Requests The HTTP client sends the request to the server in the form of request message which includes following information: The Request-line. The analysis of source IP address, proxy and port. The analysis of destination IP address, protocol, port and host.
How to get servletoutputstream object in Java?
A ServletOutputStream object is normally retrieved via the ServletResponse#getOutputStream method. This is an abstract class that the servlet container implements. Subclasses of this class must implement the java.io.OutputStream.write (int) method.
How does a servlet send a response to a client?
Defines an object to assist a servlet in sending a response to the client. The servlet container creates a ServletResponse object and passes it as an argument to the servlet’s service method. To send binary data in a MIME body response, use the ServletOutputStream returned by getOutputStream () .
How to access the response body in Java servlets?
In Java Servlets, one can access the response body via response.getOutputStream() or response.getWriter(). Should one call .close() on this OutputStream after it has been written to?
How does the public interface in servletresponse work?
public interface ServletResponse Defines an object to assist a servlet in sending a response to the client. The servlet container creates a ServletResponseobject and passes it as an argument to the servlet’s servicemethod. To send binary data in a MIME body response, use the ServletOutputStreamreturned by getOutputStream().