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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"><font size="-1"><b>e8</b> Deserializing a Bean from XML</font></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 < 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>
<?xml version="1.0" encoding="UTF-8"?>
<java version="1.4.0" class="java.beans.XMLDecoder">
<object class="MyClass2">
<void property="prop">
<int>1</int>
</void>
</object>
</java>
</pre>
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Related Examples
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e7. <a class="eglink" href="WriteXml.html?l=rel">
Serializing a Bean to XML
</a>
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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>
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See also:
<a class="eglink" href="/egs/java.beans/pkg.html?l=rel#Events">
Events
</a>
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