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Table 5-2. The Methods on the HttpServletResponse Object
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addCookie() addHeader() addIntHeader() containsHeader() encodeRedirectURL() encodeRedirectUrl() encodeURL()
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Does nothing. Does nothing. Does nothing. Returns false. Returns null. Returns null; deprecated. Returns an encoded URL for URL rewriting for session tracking. Returns an encoded URL for URL rewriting for session tracking; deprecated. Flushes the buffered output to the client for the response body, and commits the response. Returns the size of the response buffer. Returns the character encoding used by the MIME body for the portlet s response. Returns the portlet response s locale. Returns the output stream for writing binary data. Returns a writer for writing textual data. Returns true if the response has been committed. Resets the buffer and the response properties, if the response has not been committed. Resets the buffer if it hasn t been committed yet. Leaves properties alone. Useful for error message handling. Does nothing. Does nothing. Does nothing. Does nothing. Sets the buffer size used for the portlet s response body. Does nothing. Does nothing. Does nothing.
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getLocale() getOutputStream() getWriter() isCommitted() reset()
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setDateHeader() setHeader() sendError() sendRedirect() setBufferSize() setContentLength() setContentType() setIntHeader() 130
Using Servlets and JavaServer Pages with Portlets
Table 5-2. The Methods on the HttpServletResponse Object (continued)
Method Name Method Description
setLocale() setStatus()
Does nothing. Does nothing.
Request Parameters and Attributes
The request parameters from the portlet s render request object are available in the servlet or JSP as parameters on the servlet request object. The parameters are named the same, and can be accessed through the getParameter() method on the request object. The same is true for attributes stored on the portlet s render request. The servlet or JSP will be able to access these attributes from the servlet request object.
Session Management Between a Portlet and a Servlet or JSP
All of the resources in a portlet application share a session for each user. Portlets will access the session through the PortletSession object, and servlets and JSPs will use their HttpSession objects. Any attributes stored on the session by a portlet are accessible through the HttpSession object, and any attributes stored by servlets or JSPs are accessible through the PortletSession object. A portlet may share an object in the session for a servlet or a JSP by putting the object into the application scope. If the object is in portlet scope, the object will be in a namespace defined by the portlet container, and will not be easily accessible to the servlet or JSP The object will still be an attribute on the session, . but it would be tricky to decode the proper name. You should avoid trying to decode an out-of-scope attribute, because it will be container-specific this would qualify as a hack. Inside the portlet, you call the setAttribute() method on a PortletSession object like this:
PortletSession session = request.getPortletSession(true); session.setAttribute("ContentManager", contentManager, PortletSession.APPLICATION_SCOPE);
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From the JSP or servlet, you ask the HTTPSession object for an attribute called ContentManager, just as you normally would do for any other object on the session. In a servlet, it might look like this:
ContentManager contentMgr = (ContentManager) session.getAttribute("ContentManager");
Creating a Form in JSP
Your portlet s JavaServer Pages can use HTML forms just like stand-alone JSP pages. The two most important portlet practices are to use the POST method for all forms, and to set the action for the form to an action URL or a render URL for the portlet. The POST method is necessary because the URL s query string may be used by the portlet container or portal to maintain information about the user s session. The POST method is safe for portlets (and any servlets or JSP pages they include) to use. The HTML form will need to point back to the portlet that created the form so the portlet can process the request. The portlet can create PortletURL objects that can then create portlet URLs. There are two choices for creating a portlet URL: action URLs or render URLs. Inside the JSP page, you will need to use one of the portlet URL JSP tags to create a portlet URL. Either portlet URL JSP tag will output a URL, so you can just include a tag into your form s action. We discuss the portlet JSP tags in the next section. For more on portlet URLs, see 2.
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