BBjCookie
Description
In BBj 12.00 and higher, BBjCookie
creates
a cookie, a small amount of information sent by a servlet to a Web browser,
saved by the browser, and later sent back to the server. A cookie's value
can uniquely identify a client, so cookies are commonly used for session
management.
A
cookie has a name, a single value, and optional attributes such as a comment,
path and domain qualifiers, a maximum age, and a version number. Some
Web browsers have bugs in how they handle the optional attributes, so
use them sparingly to improve the interoperability of your servlets.
The
servlet sends cookies to the browser which adds fields to HTTP response
headers to send cookies to the browser, one at a time. The browser is
expected to support 20 cookies for each Web server, 300 cookies total,
and may limit cookie size to 4 KB each.
Creation
BBxServletContext > BBxServletResponse > BBjCookie
A BBjCookie object is obtained
with the following BBxServletResponse method:
Deprecated Creation
BBjServletEvent > BBjHttpResponse > BBjCookie
Methods of BBjCookie
Remarks
The
browser returns cookies to the servlet by adding fields to HTTP request
headers. Cookies can be retrieved from a request by using the BBxServletRequest::getCookies()
method. Several cookies might have the same name but different path attributes.
Example
rem '/**
rem '* Enter the values for your username, password, and the filepath to this file
rem '*/
username$ = "admin"
password$ = "admin123"
pathToThisFile$ = "/path/to/BBxServletResponseDemo.bbj"
context! = BBjAPI().getAdmin(username$, password$).getJettyServerConfig().getCustomContext("root")
context!.addBBxServlet("/BBxServletResponseDemo", pathToThisFile$, "BBxServletResponseDemo", "bbxServletResponseDemo", 1)
BBjAPI().getAdmin(username$, password$).getJettyServer().getContext("root").restart()
CLASS PUBLIC BBxServletResponseDemo
rem 'Demonstrates the various capabilities of the BBxServletResponse object
METHOD PUBLIC VOID bbxServletResponseDemo(BBxServletContext context!)
rem 'Get the response object from the BBxServletContext
response! = context!.getResponse()
rem 'Get ServletOutputStream from BBxServletResponse
out! = response!.getOutputStream()
out!.write("<h2>BBxServletResponse</h2>")
out!.write("<p>This is the response object that is used to send information back to the client when the ")
out!.write("servlet is called. The primary method through which information is passed around is the ")
out!.write("ServletOutputStream returned through BBxServletResponse.getOutputStream.</p>")
#addCookieDemo(context!)
out!.write("<p>See <code>addCookieDemo</code> in source code for method usage examples</p>")
#statusCodesDemo(context!)
out!.write("<p>See <code>statusCodeDemo</code> in source code for method usage examples</p>")
#sendRedirectDemo(context!)
out!.write("<p>See <code>sendRedirectDemo</code> in source code for method usage examples</p>")
#responseInfoMethodsDemo(context!)
out!.write("<p>See <code>responseInfoMethodsDemo</code> in source code for method usage examples</p>")
METHODEND
rem 'Demonstrates how to create a cookie as well as how to add it to the BBxServletResponse
METHOD PUBLIC VOID addCookieDemo(BBxServletContext context!)
rem 'Get the request and response object from the BBxServletContext
request! = context!.getRequest()
response! = context!.getResponse()
rem 'Get ServletOutputStream from BBxServletResponse
out! = response!.getOutputStream()
rem 'Check parameters for addCookie query
cookies! = new BBjVector()
cookiesToAdd! = request!.getParameterValues("addCookieName")
cookieVals! = request!.getParameterValues("cookieVal")
if (cookiesToAdd!.size()>0) then
FOR N=0 TO cookiesToAdd!.size()-1
name$ = cookiesToAdd!.getItem(N)
value$ = cookieVals!.getItem(N)
rem 'create cookie
cookie! = response!.createCookie(name$)
cookie!.setValue(value$)
rem 'add cookie to response
response!.addCookie(cookie!)
cookies!.addItem(cookie!)
NEXT N
endif
out!.write("<h3>Adding BBjCookies</h3>")
out!.write("<p>BBjCookies can be added to a response which will set them in the client browser. This can be")
out!.write(" done by creating a cookie with <code>response!.createCookie(name$)</code> and then adding the ")
out!.write("cookie to the response with <code>response!.addCookie(cookie!)</code>.<p>")
rem 'loop over cookie BBjVector to print out the cookies that will be added
if cookies!.size() > 0
out!.write("<p>The following cookies will be added to this response:</p><ul>")
FOR N=0 TO cookies!.size()-1
cookie! = cookies!.getItem(N)
out!.write("<li> Cookie "+String.valueOf(N)+":")
out!.write("<ul><li>name = "+cookie!.getName()+"</li><li>value = "+cookie!.getValue()+"</li></ul>")
NEXT N
out!.write("</ul>")
out!.write("To see these cookies in the request, <b>refresh the page</b>.")
endif
out!.write("<p>Try adding a cookie below!</p>")
rem 'An HTML form to add cookies to the request
out!.write("Enter the name and value of a cookie to add:")
out!.write("<form method='GET' enctype='text/html' action='"+request!.getServletPath()+"'>")
out!.write("Name: <input type='text' name='addCookieName'> Value: <input type='text' name='cookieVal'> ")
out!.write("<input type='submit' value='Press'> to <b>add</b> a cookie to the next response!")
out!.write("</form>")
METHODEND
rem 'Demonstrates the getStatus() and sendError(in code) methods in BBxServletResponse
METHOD PUBLIC VOID statusCodesDemo(BBxServletContext context!)
rem 'Get the request and response object from the BBxServletContext
request! = context!.getRequest()
response! = context!.getResponse()
rem 'Get ServletOutputStream from BBxServletResponse
out! = response!.getOutputStream()
rem 'Check parameters for sendError query
errorCode! = request!.getParameter("sendError")
errorMsg! = request!.getParameter("errorMsg")
if (errorCode!.length() > 0) then
rem 'Send the error code and message
response!.sendError(Integer.parseInt(errorCode!), errorMsg!)
endif
rem 'Get the value of getStatus()
status! = response!.getStatus()
out!.write("<h3>Status Codes</h3>")
out!.write("<p>Through BBxServletResponse, you have the capability to check status codes as well as send error ")
out!.write("codes along with a message. Below is the current return value for <code>getStatus()</code></p>")
out!.write("<code><ul><li>getStatus() = "+String.valueOf(status!)+"</li></ul></code>")
rem 'Form for submitting an error code
out!.write("Try submitting an error code and message for yourself!")
out!.write("<form method='GET' enctype='text/html' action='"+request!.getServletPath()+"'>")
out!.write("Error Code: <input type='text' name='sendError'> Message: <input type='text' name='errorMsg'> ")
out!.write("<input type='submit' value='Press'> to send an error.")
out!.write("</form>")
METHODEND
rem 'Demonstration of the sendRedirect(url$) method
METHOD PUBLIC VOID sendRedirectDemo(BBxServletContext context!)
rem 'Get the request and response objects from the BBxServletContext
request! = context!.getRequest()
response! = context!.getResponse()
rem 'Get ServletOutputStream from BBxServletResponse
out! = response!.getOutputStream()
rem 'check parameters for sendRedirect parameter
sendRedirect! = request!.getParameter("sendRedirect")
rem 'Send the redirect on the response
if (sendRedirect!.length() > 0) then
response!.sendRedirect(sendRedirect!)
endif
out!.write("<h3>Send Redirect</h3>")
out!.write("<p>With <code>sendRedirect</code>, you can redirect a page to any URL you would like.</p>")
out!.write("<p>Enter a URL below to redirect the servlet to that page</p>")
rem 'An HTML form to add sendRedirect parameter to URL
out!.write("<form method='GET' enctype='text/html' action='"+request!.getServletPath()+"'>")
out!.write("Redirect URL: <input type='text' name='sendRedirect'> ")
out!.write("<input type='submit' value='Press'> to redirect page")
out!.write("</form>")
METHODEND
rem 'Demonstrates methods for getting and setting various information in the BBxServletResponse
METHOD PUBLIC VOID responseInfoMethodsDemo(BBxServletContext context!)
rem 'Get the request and response objects from the BBxServletContext
request! = context!.getRequest()
response! = context!.getResponse()
rem 'Get ServletOutputStream from BBxServletResponse
out! = response!.getOutputStream()
rem 'Check parameters for setCharacterEncoding and set it to the specified value
setCharacterEncoding! = request!.getParameter("setCharacterEncoding")
if (setCharacterEncoding!.length() > 0) then
response!.setCharacterEncoding(setCharacterEncoding!)
endif
rem 'Check parameters for setContentType and set it to the specified value
setContentType! = request!.getParameter("setContentType")
if (setContentType!.length() > 0) then
response!.setContentType(setContentType!)
endif
rem 'Check parameters for setDateHeader values and set the date header
setDateHeaderName! = request!.getParameter("setDateHeaderName")
setDateHeaderValue! = request!.getParameter("setDateHeaderValue")
if (setDateHeaderName!.length() > 0) then
response!.setDateHeader(setDateHeaderName!, Long.parseLong(setDateHeaderValue!))
endif
rem 'Check parameters for setHeader values and set them in the response
setHeaderName! = request!.getParameter("setHeaderName")
setHeaderValue! = request!.getParameter("setHeaderValue")
if (setHeaderName!.length() > 0) then
response!.setHeader(setHeaderName!, setHeaderValue!)
endif
rem 'Check parameters for setLocale and set the locale to that value
setLocale! = request!.getParameter("setLocale")
if (setLocale!.length() > 0) then
response!.setLocale(new java.util.Locale(setLocale!))
endif
rem 'Get BBxServletResponse info
isCommitted! = response!.isCommitted()
characterEncoding! = response!.getCharacterEncoding()
contentType! = response!.getContentType()
headerNames! = response!.getHeaderNames()
getHeadersString$ = ""
getHeaderString$ = ""
if (headerNames!.size() > 0) then
getHeadersString$ = getHeadersString$ + "<ul>"
getHeaderString$ = getHeaderString$ + "<ul>"
FOR N=0 TO headerNames!.size()-1
name$ = headerNames!.get(N)
headers! = response!.getHeaders(name$)
getHeadersString$ = getHeadersString$ + "<li>getHeaders(<em>"+name$+"</em>) = "+String.valueOf(headers!)+"</li>"
header! = response!.getHeader(name$)
getHeaderString$ = getHeaderString$ + "<li>getHeaders(<em>"+name$+"</em>) = "+String.valueOf(header!)+"</li>"
NEXT N
getHeadersString$ = getHeadersString$ + "</ul>"
getHeaderString$ = getHeaderString$ + "</ul>"
endif
locale! = response!.getLocale()
out!.write("<h3>BBxServletResponse Header Info</h3>")
out!.write("<p>BBxServletResponse has a number of methods that allow you to get as well as set values in the ")
out!.write("response header. Below are the methods and return values along with fields that will allow you to")
out!.write(" change their values.</p>")
out!.write("<code><ul>")
out!.write("<li>boolean isCommitted() = "+Boolean.toString(isCommitted!)+"</li>")
out!.write("<li>String getCharacterEncoding() = "+String.valueOf(CAST(Object, characterEncoding!))+"</li>")
out!.write("<li>String getContentType() = "+String.valueOf(CAST(Object, contentType!))+"</li>")
out!.write("<li>Locale getLocale() = "+String.valueOf(CAST(Object, locale!))+"</li>")
out!.write("<li>BBjVector getHeaderNames() = "+String.valueOf(headerNames!)+"</li>")
out!.write("<li>String getHeader(String name) : "+getHeaderString$+"</li>")
out!.write("<li>String getHeaders(String name) : "+getHeadersString$+"</li>")
out!.write("</code></ul>")
out!.write("<p>Try changing these values below.</p>")
rem 'An HTML form to add setCharacterEncoding parameter to URL
out!.write("<form method='GET' enctype='text/html' action='"+request!.getServletPath()+"'>")
out!.write("Character Encoding: <input type='text' name='setCharacterEncoding'> ")
out!.write("<input type='submit' value='Press'> to set character encoding")
out!.write("</form>")
rem 'An HTML form to add setContentType parameter to URL
out!.write("<form method='GET' enctype='text/html' action='"+request!.getServletPath()+"'>")
out!.write("Content Type: <input type='text' name='setContentType'> ")
out!.write("<input type='submit' value='Press'> to set content type")
out!.write("</form>")
rem 'An HTML form to add setLocale parameter to URL
out!.write("<form method='GET' enctype='text/html' action='"+request!.getServletPath()+"'>")
out!.write("Locale: <input type='text' name='setLocale'> ")
out!.write("<input type='submit' value='Press'> to set locale")
out!.write("</form>")
rem 'An HTML form to add setHeader parameters to URL
out!.write("<form method='GET' enctype='text/html' action='"+request!.getServletPath()+"'>")
out!.write("Header Name: <input type='text' name='setHeaderName'> Header Value: <input type='text' name='setHeaderValue'> ")
out!.write("<input type='submit' value='Press'> to set header")
out!.write("</form>")
METHODEND
CLASSEND
|
See Also
BBjAPI
BBxServletContext
BBxServletResponse
BBxServletRequest
See the BBj Object Diagram for an illustration of the relationship between BBj Objects.