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Reviews : Java Books : Jython for Java Programmers :

Buy this book
Title: Jython for Java Programmers
ISBN: 0735711119
US Price: 49.99
© NewRiders Publishing

HttpServletRequest and HttpServletResponse

Communication with client connections happens through the HttpServletRequest and HttpServletResponse object. These are abstractions of the literal request stream received from and sent to the client. Each of these objects adds higher-level, HTTP-specific methods to ease working with requests and responses.

Table 12.3 is a list of the methods within the HttpServletRequest object. A great majority of the methods are bean property accessors, which means that you can reference them with Jython's automatic bean properties. This may not be as great of an advantage here as it is for GUI programming because there is no opportunity to leverage this facility in method keyword arguments. Table 12.3 shows the methods and bean property names from the HttpServletRequest object.

Table 12.3 HttpServletRequest Methods and Properties

Method and Property

Description

Method: getAuthType()
Property name: AuthType

Returns a string (PyString) describing the name of the authentication type. The value is None if the user is notauthenticated.

Method: getContextPath()
Property name: contextPath

Returns a string (PyString) describing the path information that identifies the context requested.

Method: getCookies()
Property name: cookies()

Returns all cookies sent with the client's request as an array of javax.servlet.http.Cookie objects.

Method: getDateHeader(name)

Retrieves the value of the specified header as a long type.

Method: getHeader(name)

Returns the value of the specified header as string (PyString).

Method: getHeaderNames()
Property name: headerNames

Returns all the header names contained within the request as an Enumeration.

Method: getHeaders(name)

Returns all the values of the specified header name as an Enumeration.

Method: getIntHeader(name)

Retrieves the specified header value as a Java int, which Jython converts to a PyInteger.

Method: getMethod()
Property name: method

Returns the type of request made a string.

Method: getPathInfo()
Property name: pathInfo

All extra path information sent by the client.

Method: getPathTranslated()
Property name: pathTranslated

Returns the real path derived from extra path information in the client's request.

Method: getQueryString()
Property name: queryString

Returns the query string from the client's request (the string after the path).

Method: getRemoteUser()
Property name: remoteUser

Returns the login name of the client. None if the client is not authenticated.

Method: getRequestedSessionId()
Property name: requestedSessionId

Returns the clients session ID.

Method: getRequestURI()
Property name: requestURI

Returns that segment of the between the protocol name and the query string.

Method: getServletPath()
Property name: servletPath

Returns the portion of the URL that designates the current Servlet.

Method: getSession()
Property name: session

Returns the current session, or creates on if needed. A session is an instance of javax.servlet.http.HttpSession.

Method: getSession(create)

Returns the current session if one exists. If not, a new session is created if the create value is true.

Method: getUserPrincipal()
Property name: userPrincipal

Returns a java.security.Principal object with the current authentication information userPrincipal

Method: isRequestedSessionIdFromCookie()

Returns 1 or 0 depending on whether the current session ID was from a cookie.

Method: isRequestedSessionIdFromURL()

Returns 1 or 0 depending on whether the current session ID was from the requested URL string.

Method: isRequestedSessionIdValid()

Returns 1 or 0 depending on whether the requested session ID is still valid.

Method: isUserInRole(role)

Returns 1 or 0 indicating whether the user is listed in the specified role.


The HttpServletResponse object is used to send the mime-encoded stream back to the client. HttpServletResponse defines additional HTTP-specific methods that do not exist in a generic ServletResponse object. The methods within the HttpServletResponse object appear in Table 12.4. Whereas Jython adds numerous automatic bean properties to the HttpServletRequest object, the HttpServletResponse object only has one: status.

Table 12.4 HttpServletResponse Methods and Properties

Method and Property

Description

addCookie(cookie)

Add a cookie to the response.

addDateHeader(headerName, date)

Adds a header name with a date (long) value.

addHeader(headerName, value)

Adds a header name and value.

addIntHeader(headerName, value)

Adds a header name with an integer value.

containsHeader(headerName)

Returns a 1 or 0 depending whether the specified header.

encodeRedirectUrl(url)

Encodes a URL for the sendRedirect method. For version 2.1 and greater, use encodeRedirectURL instead.

encodeRedirectURL(url)

Encodes a URL for the sendRedirect method.

encodeURL(url)

Encodes a URL by including the session ID in it.

sendError(sc)

Sends an error using the status code.

sendError(sc, msg)

Sends an error using the specified status code and message.

sendRedirect(location)

Sends a temporary redirect to the specified location.

setDateHeader(headerName, date)

Sets a header name to the specified date (long) value.

setHeader(headerName, value)

Sets a header name to the specified value.

setIntHeader(headerName, value)

Sets a header name to the specified integer value.

setStatus(statusCode) status

Sets the response status code.


The HttpServletResponse class also contains fields that correspond to the standard HTTP response codes. You can use these with sendError(int) and setStatus(int). Table 12.5 lists the number and error code for these status codes.

Table 12.5 HttpServletResponse Status CodesError

Code

Status

100

SC_CONTINUE

101

SC_SWITCHING_PROTOCOLS

200

SC_OK

201

SC_CONTINUE

202

SC_ACCEPTED

203

SC_NON_AUTHORITATIVE_INFORMATION

204

SC_NO_CONTENT

205

SC_RESET_CONTENT

206

SC_PARTIAL_CONTENT

300

SC_MULTIPLE_CHOICES

301

SC_MOVED_PERMANENTLY

302

SC_MOVED_TEMPORARILY

303

SC_SEE_OTHER

304

SC_NOT_MODIFIED

305

SC_USE_PROXY

400

SC_BAD_REQUEST

401

SC_UNAUTHORIZED

402

SC_PAYMENT_REQUIRED

403

SC_FORBIDDEN

404

SC_NOT_FOUND

405

SC_METHOD_NOT_ALLOWED

406

SC_NOT_ACCEPTABLE

407

SC_PROXY_AUTHENTICATION_REQUIRED

408

SC_REQUEST_TIMEOUT

409

SC_CONFLICT

410

SC_GONE

411

SC_LENGTH_REQUIRED

412

SC_PRECONDITION_FAILED

413

SC_REQUEST_ENTITY_TOO_LARGE

414

SC_REQUEST_URI_TOO_LONG

415

SC_UNSUPPORTED_MEDIA_TYPE

500

SC_INTERNAL_SERVER_ERROR

501

SC_NOT_IMPLEMENTED

502

SC_BAD_GATEWAY

503

SC_SERVICE_UNAVAILABLE

504

SC_GATEWAY_TIMEOUT

505

SC_HTTP_VERSION_NOT_SUPPORTED


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