Called by the server (via the service method) to
allow a servlet to handle a GET request.
Overriding this method to support a GET request also
automatically supports an HTTP HEAD request. A HEAD
request is a GET request that returns no body in the
response, only the request header fields.
When overriding this method, read the request data,
write the response headers, get the response's writer or
output stream object, and finally, write the response data.
It's best to include content type and encoding. When using
a PrintWriter object to return the response,
set the content type before accessing the
PrintWriter object.
The servlet container must write the headers before
committing the response, because in HTTP the headers must be sent
before the response body.
Where possible, set the Content-Length header (with the
javax.servlet.ServletResponse.setContentLength method),
to allow the servlet container to use a persistent connection
to return its response to the client, improving performance.
The content length is automatically set if the entire response fits
inside the response buffer.
When using HTTP 1.1 chunked encoding (which means that the response
has a Transfer-Encoding header), do not set the Content-Length header.
The GET method should be safe, that is, without
any side effects for which users are held responsible.
For example, most form queries have no side effects.
If a client request is intended to change stored data,
the request should use some other HTTP method.
The GET method should also be idempotent, meaning
that it can be safely repeated. Sometimes making a
method safe also makes it idempotent. For example,
repeating queries is both safe and idempotent, but
buying a product online or modifying data is neither
safe nor idempotent.
If the request is incorrectly formatted, doGet
returns an HTTP "Bad Request" message.
Parameters:
request - an javax.servlet.http.HttpServletRequest object thatcontains the request the client has madeof the servlet
Parameters:
response - an javax.servlet.http.HttpServletResponse object thatcontains the response the servlet sendsto the client
throws:
java.io.IOException - if an input or output error isdetected when the servlet handlesthe GET request
throws:
javax.servlet.ServletException - if the request for the GETcould not be handled
See Also: javax.servlet.ServletResponse.setContentType | 