Versions Compared

Old Version 8

changes.mady.by.user Sainath Chowdary

Saved on

compared with

New Version 9

changes.mady.by.user Sainath Chowdary

Saved on

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.

...

Info
Errors in Servlet
Errors in Servlet

Here the servlet might notify that some imports are not resolved. We need to add two external jar files to resolve these errors.
The jar files that needed to be added in the build path are:
commons-codec-1.3.jar - <GERONIMO_INSTALL_DIR>\repository\commons-codec\commons-codec\1.3\commons-codec-1.3.jar
commons-httpclient-3.0.1.jar - <GERONIMO_INSTALL_DIR>\repository\commons-httpclient\commons-httpclient\3.0.1\commons-httpclient-3.0.1.jar

  • Let us walkthrough the code of ConverterHandler servlet.
    • We will create a HttpClient object and GetMethod object for our requestquery. Then we will execute the method on our client object.
    • The response after executing the method will be taken as a stream so as to parse the XML elements in response message sent by the Web Service.
    • Here we used XPath to process XML response messages sent by web service.
      Info
      titleXPath Processing

      XPath (XML Path Language) is a language for selecting nodes from an XML document with very advanced features.

      Our response message sent by web service may look like this:

      Code Block
      titleresponse.xml
      
<return>
    <dollarToRupeesResponse>933.34</dollarToRupeesResponse>
    <rupeesToEuroResponse>933.34</rupeesToEuroResponse>
</return>

      We will first try to get the NodeList present between <return> elements, Then we evaluate each child node to get the results.

This concludes the development section of our web based client.

...