Getting and Setting an Attribute in a DOM Element
// Obtain an XML document; this method is implemented in
// The Quintessential Program to Create a DOM Document from an XML File
Document doc = parseXmlFile("infilename.xml", false);
// Obtain an element
Element element = doc.getElementById("key1");
// Determine the presence of an attribute
boolean has = element.hasAttribute("value"); // true
// Get an attribute value; returns null if not present
String attrValue = element.getAttribute("value"); // value1
// Change the value of an attribute
element.setAttribute("value", "newValue1");
// If an attribute is not specified in the XML but has a
// default value, the attribute is automatically created
element = doc.getElementById("key2");
has = element.hasAttribute("value"); // true
attrValue = element.getAttribute("value"); // value2
// If the attribute value contains special characters,
// they are automatically converted to entities when the
// document in dumped
element.setAttribute("value", "a<\"'&>z");
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE map [ <!ELEMENT map (entry*) >
<!ELEMENT entry EMPTY >
<!ATTLIST entry key ID #REQUIRED
value CDATA "mydefault"> ]>
<map>
<entry key="key1" value="value1"/>
<entry key="key2" />
</map>
<?xml version="1.0" encoding="UTF-8"?>
<map>
<entry key="key1" value="newValue1"/>
<entry key="key2" value="a<"'&>z"/>
</map>
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