Java(TM) Boutique - Converting XML to JavaBeans with XMLBeans

Reviews : Converting XML to JavaBeans with XMLBeans :

Saving and modifying the XML document

What if you want to write the document back to the file system? That's easy: add this line to your program:

webappDoc.save(new File("c:/webapp.xml"));

If you look in the output file you'll be impressed to see that it's an exact copy of your original document. Even the comments and formatting are preserved! To add elements to your xml document it is also very easy. If we want to add another servlet-mapping we could code it like this:

    
ServletMapping newSM = webapp.addNewServletMapping();
newSM.setServletName("action2"); 
newSM.setUrlPattern("done.*");

You may control where the new servlet-mapping element is inserted. Use an index to show the position, zero means "at the beginning":

    
// Insert new element before the others: 
    ServletMapping newSM = webapp.insertNewServletMapping(0);
    newSM.setServletName("action2"); 
    newSM.setUrlPattern("done.*");

If you want to update some of the data in the document you use the setter-methods. To change the name of the welcome-file we use this code:

    
WelcomeFileList fileList = webapp.getWelcomeFileList();
    fileList.setWelcomeFileArray(new String[]{"welcome.htm"});

To keep the XML document pretty-printed you have several options to apply to the save method, e.g.:

    
    XmlOptions opt = new XmlOptions();
    opt.setSavePrettyPrint();
    opt.setSavePrettyPrintIndent(3);

    webappDoc.save(new File("c:/webapp.xml"), opt);

I'll encourage you to use the JavaDoc to see the many methods that are available. If you use a tool like Eclipse the code-complete feature may also help you to inspect the methods that are at hand.

Package names

In the FirstTry program you may have noticed the names of the package in the generated jar-file: noNamespace. XMLBeans takes the package name from the namespace definition in the schema file, so let's make a new schema element like this:

<xsd:schema 
  targetNamespace="http://playground.hansen.dk" 
  elementFormDefault="qualified" 
  xmlns:xsd="http://www.w3.org/2001/XMLSchema">

In the XML instance file we must add the same namespace:

<web-app xmlns="http://playground.hansen.dk">

When we generate the jar file this time the package name will be dk.hansen.playground, so the only thing that needs to be changed in the FirstTry program is the import statements.

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