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<TITLE>Preventing a Bean Property from Being Serialized to XML (Java Developers Almanac Example)
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  <h3>e9. Preventing a Bean Property from Being Serialized to XML</h3>

By default, when serializing an object into XML, the current value of
all public properties is persisted (if they don't equal the default
value). This example demonstrates how to prevent a public property
from being persisted.

<P>
See also <a href="../java.beans/ReadXml.html" class="eglink"><b>e8</b> Deserializing a Bean from XML</a>.  


<pre>    // Create an object and set properties
    <font color="#0066ff"><i>MyClass2</i></font> o = new <font color="#0066ff"><i>MyClass2</i></font>();
    o.setProp(<font color="#0066ff"><i>1</i></font>);
    o.setProps(new int[]{<font color="#0066ff"><i>1, 2, 3</i></font>});
    
    try {
        // Serialize object into XML.
        // props is transient so it will not be persisted.
        XMLEncoder encoder = new XMLEncoder(new BufferedOutputStream(
            new FileOutputStream(<font color="#0066ff"><i>"outfilename.xml"</i></font>)));
        encoder.writeObject(o);
        encoder.close();
    } catch (FileNotFoundException e) {
    }
</pre>


<pre>    // This class defines two properties - prop and props.
    // The props property is marked transient so that it will not
    // be persisted if serialized into XML.
    import java.beans.*;
    public class MyClass2 {
        // The prop property
        int i;
        public int getProp() {
            return i;
        }
        public void setProp(int i) {
            this.i = i;
        }
    
        // The props property
        int[] iarray = new int[0];
        public int[] getProps() {
            return iarray;
        }
        public void setProps(int[] iarray) {
            this.iarray = iarray;
        }
    
        static {
            try {
                // Make the props property transient
                BeanInfo info = Introspector.getBeanInfo(MyClass2.class);
                PropertyDescriptor[] propertyDescriptors = info.getPropertyDescriptors();
                for (int i = 0; i &lt; propertyDescriptors.length; ++i) {
                    PropertyDescriptor pd = propertyDescriptors[i];
                    if (pd.getName().equals("props")) {
                        pd.setValue("transient", Boolean.TRUE);
                    }
                }
            } catch (IntrospectionException e) {
            }
        }
    }
</pre>
Here is the XML data:

<pre>    &lt;?xml version="1.0" encoding="UTF-8"?&gt;
    &lt;java version="1.4.0" class="java.beans.XMLDecoder"&gt;
        &lt;object class="MyClass2"&gt;
            &lt;void property="prop"&gt;
                &lt;int&gt;1&lt;/int&gt;
            &lt;/void&gt;
        &lt;/object&gt;
    &lt;/java&gt;
</pre>
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            &nbsp;<b>Related Examples</b></font></td>
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e7. <a class="eglink" href="WriteXml.html?l=rel">
    Serializing a Bean to XML
</a>
<br>

e8. <a class="eglink" href="ReadXml.html?l=rel">
    Deserializing a Bean from XML
</a>
<br>

e10. <a class="eglink" href="Immute.html?l=rel">
    Serializing an Immutable Bean Property to XML
</a>
<br>


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<br>
        See also: 
<a class="eglink" href="/egs/java.beans/pkg.html?l=rel#Events">
    Events
</a>&nbsp;&nbsp;

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