By Steven Douglas Olson

ISBN-10: 0596101872

ISBN-13: 9780596101879

This useful advisor exhibits you ways to make your Java internet purposes extra responsive and dynamic by means of incorporating new Ajaxian positive aspects, together with advice lists, drag-and-drop, and extra. Java builders can make a choice from many alternative methods of incorporating Ajax, from development JavaScript into your functions "by hand" to utilizing the recent Google net Toolkit (GWT). Ajax on Java begins with an creation to Ajax, displaying you ways to jot down a few easy functions that use client-side JavaScript to request details from a Java servlet and reveal it with no doing an entire web page reload. It additionally offers a number of thoughts for speaking among the customer and the server, together with sending uncooked info, and utilizing XML or JSON (JavaScript item Notation) for sending extra complicated collections of information. The booklet then branches out into varied ways for incorporating Ajax, which come with: The Prototype and Javascript libraries, the Dojo and Rico libraries, and DWRIntegrating Ajax into Java ServerPages (JSP) purposes utilizing Ajax with Struts Integrating Ajax into Java ServerFaces (JSF) functions utilizing Google's GWT, which bargains a natural Java method of constructing internet purposes: your client-side elements are written in Java, and compiled into HTML and JavaScript Ajax provides internet builders the facility to construct functions which are extra interactive, extra dynamic, extra intriguing and stress-free on your clients. in case you are a Java developer and have not attempted Ajax, yet want to start, this booklet is vital. Your clients could be thankful.

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In most cases, you will be better off with a JSON implementation. This is our data object represented in JSON: {"conversion":{ "decimal": "120", "hexadecimal": "78", "octal": "170", "hyper": "&0x78", "binary": "1111000B"} } There are programmatic ways to build the JSON object, but to keep it simple we'll use a StringBuffer again and glue together the strings that will form the conversion object. Example 4-10 illustrates how we build the data object in the servlet. Example 4-10. toString( ); } } That wasn't all that different from creating an XML document with a StringBuffer.

As shown in Example 4-3, we create a document, add a root element to the document, add the elements and data to the root, and then return the document in a String. Example 4-3. XMLWriter; ... createDocument( ) to create the XML document. addElement( ) puts a child element on the root element, and addText( ) puts the data in the elements. > 97 0x61 0141 &0x61 1100001B 32 33 This step can be skipped, because it only formats the document for readability by adding linefeeds and spaces.

53 54 Example 5-3. close( ); } catch (SQLException e) { } } } return cityStateMap; } 54 55 We use the JSON format to pass data back to the client because it is simpler to process and therefore less error-prone. Using the zip code, we look up the corresponding city and state in the database and store them in a HashMap. We then pass that HashMap into the buildJSON( ) method. toString( ); } This isn't production-quality code: the exceptions aren't handled very well, the database connections aren't managed well, there's no logging, and so on.

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Ajax on Java by Steven Douglas Olson

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