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The servlet response object passed to the servlet or JSP by the portlet wraps the behavior of the portlet s RenderResponse object. Like the RenderRequest object, the RenderResponse object is similar to its servlet counterpart. Having a firm knowledge of Java servlet programming can go a long way in understanding portlet development and best practices. Table 5-2 describes the behavior of the methods on the HttpServletResponse object when a portlet includes content from a servlet or JSP .

Note .NET 3.0 introduced Language Integrated Query (LINQ) extensions that offered a new way of reading

5

Now that you are ready to start coding, the first step will be to handle the input parameter. This page will be called using a URI like this: GetPicture.aspx PicID= <something>, and the parameterized ID will be used to call the database for a specific picture. This is achieved with the following code:

addCookie() addHeader() addIntHeader() containsHeader() encodeRedirectURL() encodeRedirectUrl() encodeURL()

and writing XML documents. .NET 3.5 and Visual Studio 2008 continue to harness these features. You will learn more about LINQ later in this chapter. 13 covers the LINQ features as applicable to XML data manipulation in fuller details.

int picID; if (Request.Params["PicID"] != null) picID = Convert.ToInt16(Request.Params["PicID"]); else picID = 100;

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.

XML solves the problem of data representation and exchange. However, often we need to convert this XML data into a format understood by the target application. For example, if your target client application is a web browser, the XML data must be converted to HTML before display in the browser.

encodeUrl()

This simply checks to see if the parameter is present. If it is, it loads its value into the integer picID; otherwise it defaults it to 100. Next, you set up your data connection and initialize a SQL query to use this parameter:

flushBuffer()

Another example is that of business-to-business (B2B) applications. Let s say that application A captures order data from the end user and represents it in some XML format. This data then needs to be sent to application B that belongs to some other business. It is quite possible that the XML format as generated by application A is different from that required by application B. In such cases, you need to convert the source XML data to a format acceptable to the target system. In short, in real-world scenarios you need to transform XML data from one form to another. That is where XSLT comes in handy. XSLT stands for Extensible Stylesheet Language Transformations and allows you to transform XML documents from one form into another. Figure 1-5 shows how this transformation happens.

string connectionString = WebConfigurationManager.ConnectionStrings["AdventureWorksConnectionString"] .ConnectionString; SqlConnection con = new SqlConnection(connectionString); string sql = "Select * from Production.ProductPhoto where ProductPhotoID=@ID"; SqlCommand cmd = new SqlCommand(sql, con); cmd.Parameters.Add("@ID", picID);

getBufferSize() getCharacterEncoding()