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| AJAX: Redefining Web Applications |
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/Using XML
Entered key: 12
<converted-values>
<binary>1100</binary>
<octal>14</octal>
<decimal>12</decimal>
<hexadecimal>c</hexadecimal>
</converted-values>
If you do not provide any value, it behaves
similar as shown below:
When the number 67 is entered, it behaves
as:
Corresponding output at the server console:
Using XML
Entered key: 67
<converted-values>
<binary>1000011</binary>
<octal>103</octal>
<decimal>67</decimal>
<hexadecimal>43</hexadecimal>
</converted-values>
In the above servlet, we used simple StringBuffer class to create a xml as a response string. This response string is then parsed at the client-side by leveraging the built-in xml parsers in the browser. There are two different
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functions given in the html file, i.e. msPopulate(
) for IE browser and nonMSPopulate( ) for non-IE browsers. The extracted data is then placed into the different UI elements of the web page.
II. Constructing and parsing the response data with JSON:
• One major drawback with XML is speed.
• XML requires two tags per data point, plus extra tags for parent nodes. All this extra data in transmission slows down the data exchange between the client and server.
• It means that the data transmission becomes slower as the response XML string becomes bulkier.
• So, there is another way to send data to the client that is easier to parse and more compact. That alternative is JSON
[JavaScript Object Notation].
• Advantages of using JSON:
• JSON objects are typically smaller than the equivalent XML documents.
• Working with them is more memoryefficient.
• You can parse JSON with JavaScript’s eval() function – For this you don’t need other libraries, and you don’t need to worry as much about cross-browser functionality.
• As long as your browser has JavaScript enabled and supports the eval() function, you will be able to interpret the data.
• Following is the data object represented in JSON:
{
“conversion”:
{
“decimal”: “120”,
“hexadecimal”: “78”,
“octal”: “170”,
“binary”: “1111000B”
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Nov
2007 | Java Jazz Up | 53 |
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