public class LiveBeansViewServlet extends HttpServlet
LiveBeansView
's MBean exposure.
Generates a JSON snapshot for current beans and their dependencies in all ApplicationContexts that live within the current web application.
LiveBeansView.getSnapshotAsJson()
,
Serialized FormConstructor and Description |
---|
LiveBeansViewServlet() |
Modifier and Type | Method and Description |
---|---|
protected LiveBeansView |
buildLiveBeansView() |
protected void |
doGet(HttpServletRequest request,
HttpServletResponse response)
Called by the server (via the
service method) to
allow a servlet to handle a GET request. |
void |
init()
A convenience method which can be overridden so that there's no need
to call
super.init(config) . |
doDelete, doHead, doOptions, doPost, doPut, doTrace, getLastModified, service, service
destroy, getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, getServletName, init, log, log
public void init() throws ServletException
javax.servlet.GenericServlet
super.init(config)
.
Instead of overriding GenericServlet.init(ServletConfig)
, simply override
this method and it will be called by
GenericServlet.init(ServletConfig config)
.
The ServletConfig
object can still be retrieved via GenericServlet.getServletConfig()
.
init
in class GenericServlet
ServletException
- if an exception occurs that
interrupts the servlet's
normal operationprotected LiveBeansView buildLiveBeansView()
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
javax.servlet.http.HttpServlet
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
ServletResponse.setContentLength(int)
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.
doGet
in class HttpServlet
request
- an HttpServletRequest
object that
contains the request the client has made
of the servletresponse
- an HttpServletResponse
object that
contains the response the servlet sends
to the clientServletException
- if the request for the GET
could not be handledIOException
- if an input or output error is
detected when the servlet handles
the GET requestServletResponse.setContentType(java.lang.String)