学步园

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

<?xml version="1.0" encoding="GB2312"?><br /> <books count="3"<br /> xmlns="http://test.org/books"><br /> <!--books's comment--><br /> <book id="1"><br /> <name>Thinking in JAVA</name><br /> </book><br /> <book id="2"><br /> <name>Core JAVA2</name><br /> </book><br /> <book id="3"><br /> <name>C++ primer</name><br /> </book><br /> </books>

运行结果如下：

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>>