why we go for response.getWriter()

[Arun Maalik]

Dear sir
why we go for response.getWriter() ,PrintWriter is a class we can make the object via PrintWriter obj=new PrintWriter();Why we did like that in every servlet program.

Thanks and Regards
Arun kumar maalik

[Ben Souther]

Look again at the API for the PrintWriter class.
http://java.sun.com/j2se/1.5.0/docs/api/java/io/PrintWriter.html

There is no empty constructor.
In order to create one, you need something some kind of outputstream or file.

The container insures that you have a valid outputstream that will go back to the client.

[Scott Selikoff]

If you're asking why its done that way everytime (I agree that it is repetitive), its because java is not a pure web language. Most of the use of java in servlet/jsps are extensions of the language in order to make it more accessible to web programmers.

Its why PHP is often a lot faster than writing in JSP/Servlets, but with the added work comes more power and more control. For example, you can have servlets that perform work and never use the print writer.

[Arun Maalik]

Thanks sir

[William Brogden]

For servlets to work, it must be possible to configure the response output stream for binary output (images, etc) or character output (HTML) under the programmers control. Therefore we have getWriter() and getOutputStream() - the programmer must choose the appropriate one.
Bill