|Constructor and Description|
|Modifier and Type||Method and Description|
Called by the server (via the
Called by the servlet container to indicate to a servlet that the servlet is being placed into service.
doDelete, doHead, doOptions, doPost, doPut, doTrace, getLastModified, service, service
destroy, getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, getServletName, init, log, log
public WebSocketServlet(WebSocketConnectionCallback callback)
public void init(ServletConfig config) throws ServletException
This implementation stores the
object it receives from the servlet container for later use.
When overriding this form of the method, call
ServletConfigobject that contains configuration information for this servlet
ServletException- if an exception occurs that interrupts the servlet's normal operation
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
servicemethod) 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
PrintWriter object to return the response,
set the content type before accessing the
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
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,
returns an HTTP "Bad Request" message.
HttpServletRequestobject that contains the request the client has made of the servlet
HttpServletResponseobject that contains the response the servlet sends to the client
ServletException- if the request for the GET could not be handled
IOException- if an input or output error is detected when the servlet handles the GET request
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