android中dom解析
package Test_DOM;
import java.io.File;
import java.io.IOException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
public class Test {
public static void main(String[] args) throws ParserConfigurationException,
SAXException, IOException {
DocumentBuilderFactory builderFactory = DocumentBuilderFactory
.newInstance();
DocumentBuilder builder = builderFactory.newDocumentBuilder();
/*
* builder.parse()方法将给定文件的内容解析为一个 XML 文档， 并且返回一个新的 DOM Document对象。
*/
Document document = builder.parse(new File("books.xml"));
//打印document节点
printNode(document,0);
//获取文档的根元素，赋值给rootElement变量
Element rootElement = document.getDocumentElement();
//获取元素的count属性
int countOfBooks = Integer.parseInt(rootElement.getAttribute("count"));
System.out.println("There are "+countOfBooks+" books , they are ");
//获取rootElement的所有子节点（不包括属性节点），返回一个NodeList对象
NodeList childNodes = rootElement.getChildNodes();
for(int i = 0;i < childNodes.getLength();i++){
//获取childNodes的第i个节点
Node childNode = childNodes.item(i);
//判断childNode是不是一个元素节点，并且它的 nodeName 值为book
if(childNode.getNodeType() == Node.ELEMENT_NODE
&& childNode.getNodeName().equals("book")){
//若是，则获取childNode的所有子节点（不包括属性节点），返回一个NodeList对象
NodeList childNodes_2 = childNode.getChildNodes();
for(int j = 0;j < childNodes_2.getLength();j++){
//获取childNodes_2的第j个节点
Node childNode_2 = childNodes_2.item(j);
//判断childNode_2是不是一个元素节点，并且它的 nodeName 值为name
if(childNode_2.getNodeType() == Node.ELEMENT_NODE
&& childNode_2.getNodeName().equals("name")){
//若是，则获取childNode_2的所有子节点（不包括属性节点），返回一个NodeList对象
NodeList childNodes_3 = childNode_2.getChildNodes();
for(int k = 0;k < childNodes_3.getLength();k++){
//获取childNodes_3的第k个节点
Node childNode_3 = childNodes_3.item(k);
//判断childNodes_3是不是一个文本节点
if(childNode_3.getNodeType() == Node.TEXT_NODE){
//若是，则打印输出这个文本节点的nodeValue
System.out.println(" <<"+childNode_3.getNodeValue()+">>");
}
}
}
}
}
}
}
/*
* 打印 DOM 节点
* 输出格式为：
* nodeType(nodeName,nodeValue)
* "ATTRIBUTE"(attributeName=attributeValue)
* ...
* childNodeType[childNodeName,childNodeValue]
* ...
*/
public static void printNode(Node node,int count) {
if (node != null) {
String tmp = "";
for(int i = 0 ; i < count ; i++) tmp += " ";
//获取node节点的节点类型，赋值给nodeType变量
int nodeType = node.getNodeType();
switch (nodeType) {
case Node.ATTRIBUTE_NODE: tmp += "ATTRIBUTE";break;
case Node.CDATA_SECTION_NODE: tmp += "CDATA_SECTION";break;
case Node.COMMENT_NODE:tmp += "COMMENT";break;
case Node.DOCUMENT_FRAGMENT_NODE:tmp += "DOCUMENT_FRAGMENT";break;
case Node.DOCUMENT_NODE:tmp += "DOCUMENT";break;
case Node.DOCUMENT_TYPE_NODE:tmp += "DOCUMENT_TYPE";break;
case Node.ELEMENT_NODE:tmp += "ELEMENT";break;
case Node.ENTITY_NODE:tmp += "ENTITY";break;
case Node.ENTITY_REFERENCE_NODE:tmp += "ENTITY_REFERENCE";break;
case Node.NOTATION_NODE:tmp += "NOTATION";break;
case Node.PROCESSING_INSTRUCTION_NODE:tmp += "PROCESSING_INSTRUCTION";break;
case Node.TEXT_NODE:tmp += "TEXT";break;
default:return;//invalid node type.
}
System.out.println(tmp+" ("+node.getNodeName()+","+node.getNodeValue()+")");
/*
* node.getAttributes()方法返回
* 包含node节点的属性的 NamedNodeMap（如果它是 Element）
*/
NamedNodeMap attrs = node.getAttributes();
if(attrs != null)
for(int i = 0 ; i < attrs.getLength() ; i++){
printNode(attrs.item(i),count+1);
}
/*
* node.getChildNodes()方法返回
* 包含node节点的所有子节点的 NodeList。
*/
NodeList childNodes = node.getChildNodes();
for(int i = 0 ; i < childNodes.getLength() ; i++){
printNode(childNodes.item(i),count+1);
}
}
}
}
<?xml version="1.0" encoding="GB2312"?> <books count="3" xmlns="http://test.org/books"> <!--books's comment--> <book id="1"> <name>Thinking in JAVA</name> </book> <book id="2"> <name>Core JAVA2</name> </book> <book id="3"> <name>C++ primer</name> </book> </books>
结果
DOCUMENT (#document,null)
ELEMENT (books,null)
ATTRIBUTE (count,3)
TEXT (#text,3)
ATTRIBUTE (xmlns,http://test.org/books)
TEXT (#text,http://test.org/books)
TEXT (#text,
)
COMMENT (#comment,books's comment)
TEXT (#text,
)
ELEMENT (book,null)
ATTRIBUTE (id,1)
TEXT (#text,1)
TEXT (#text,
)
ELEMENT (name,null)
TEXT (#text,Thinking in JAVA)
TEXT (#text,
)
TEXT (#text,
)
ELEMENT (book,null)
ATTRIBUTE (id,2)
TEXT (#text,2)
TEXT (#text,
)
ELEMENT (name,null)
TEXT (#text,Core JAVA2)
TEXT (#text,
)
TEXT (#text,
)
ELEMENT (book,null)
ATTRIBUTE (id,3)
TEXT (#text,3)
TEXT (#text,
)
ELEMENT (name,null)
TEXT (#text,C++ primer)
TEXT (#text,
)
TEXT (#text,
)
There are 3 books , they are
<<Thinking in JAVA>>
<<Core JAVA2>>
<<C++ primer>>