Java 自带的 XML 操作, 留着备用
<?xml version="1.0" encoding="UTF-8" standalone="no"?> <items> <item UUID="9da9da4e-b694-4d5f-988c-7dcb32f548e1"> <date>0.09196741716363777</date> <time>7718945087234434250</time> <text>1430765505937</text> </item> <item UUID="8c52774c-030b-425a-8a3f-933c061bb75e"> <date>0.009140362233125865</date> <time>6997050766083944829</time> <text>1430765505937</text> </item> <item UUID="931938fa-ce1e-49d2-a886-4ec5bae1bdd8"> <date>0.24709196045848147</date> <time>3235439044183085217</time> <text>1430765505937</text> </item> </items>
(<)小于号会自动转化为 (<) HTML标记, (>)大于号会自动转化为 (>)
<?xml version="1.0" encoding="UTF-8" standalone="no"?> <items> <item UUID="f3a0ef1c-c697-4571-a6a3-7a4984d554d2"> <date>0.36942465313752504</date> <time>-8059914408081165808</time> <text>1430765657484</text> <tag><tag>value</tag></tag> </item> <item UUID="3c02bfcc-23e9-4cfc-ab92-7012c1bc8f7b"> <date>0.0709377155157227</date> <time>-5406396638998085219</time> <text>1430765657484</text> <tag><tag>value</tag></tag> </item> <item UUID="c68bf6ae-e6eb-4ed8-ac16-908d9c1cd98a"> <date>0.4357969220901605</date> <time>-1198327362916383684</time> <text>1430765657484</text> <tag><tag>value</tag></tag> </item> </items>
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.UUID;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.TransformerFactoryConfigurationError;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
/**
* @author Colin <br />
*
*/
public class XML {
/**
*
*/
private XML() {
// TODO Auto-generated constructor stub
}
private static final class XMLSingle {
private static final XML startup = new XML();
}
public static XML getInstance() {
return XMLSingle.startup;
}
/**
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
//getInstance().OutputXML();
StringBuilder builder = new StringBuilder( System.getProperty( "user.dir" ) + File.separator + "data" + File.separator );
//builder.append( "xml-7951f6c6-7242-4e5d-a0e6-38e0677fcc6b.xml" );
builder.append( "xml-dc1348e6-31a8-4f75-9283-b69435cab9f4.xml" );
String path = builder.toString();
//getInstance().ReadXML( path );
getInstance().ReadItem( path, "fc911e97-55cb-4060-8eb2-395933330b46" );
}
public void ReadItem( String xmlPath, String uuid ) throws ParserConfigurationException, SAXException, IOException, XPathExpressionException {
this.ReadItem( new File( xmlPath ), uuid );
}
public void ReadItem( File xmlFile, String uuid ) throws ParserConfigurationException, SAXException, IOException, XPathExpressionException {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document document = builder.parse( xmlFile );
XPath xpath = XPathFactory.newInstance().newXPath();
XPathExpression expression = xpath.compile( "/items/item[@UUID='" + uuid + "']" );
Node node = (Node) expression.evaluate( document, XPathConstants.NODE );
System.out.println( node.getNodeName() + " --> " + node.getTextContent() );
}
/**
*
* @param xmlFile
* @throws ParserConfigurationException
* @throws IOException
* @throws SAXException
*/
public void ReadXML( String xmlPath ) throws ParserConfigurationException, SAXException, IOException {
this.ReadXML( new File( xmlPath ) );
}
/**
*
* @param xmlFile
* @throws ParserConfigurationException
* @throws IOException
* @throws SAXException
*/
public void ReadXML( File xmlFile ) throws ParserConfigurationException, SAXException, IOException {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document document = builder.parse( xmlFile );
Element items = document.getDocumentElement();
NodeList list = items.getElementsByTagName( "tag" );
for ( int i = 0, l = list.getLength(); l > i; ++i ) {
Node item = list.item( i );
System.out.println( item.getTextContent() + " --> " + item.getParentNode().getNodeName() );
}
for ( Node item : this.ItemNodes( items ) ) {
System.out.println( item.getNodeName() + " --> " + item.getNodeType() + " ==> " + item.getTextContent() );
}
}
private List<Node> ItemNodes( Element root ) {
List<Node> nodes = new ArrayList<Node>( 10 );
NodeList list = root.getChildNodes();
for ( int i = 0, l = list.getLength(); l > i; ++i ) {
Node item = list.item( i );
if ( item.getNodeType() == Node.ELEMENT_NODE && item.getNodeName().equals( "item" ) ) {
nodes.add( item );
}
}
return nodes;
}
/**
*
* @throws ParserConfigurationException
* @throws TransformerFactoryConfigurationError
* @throws TransformerException
* @return
*/
public String OutputXML() throws ParserConfigurationException, TransformerFactoryConfigurationError, TransformerException {
String path = System.getProperty( "user.dir" ) + File.separator + "data" + File.separator;
File xmlFile = new File( path, "xml-" + UUID.randomUUID() + ".xml" );
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document document = builder.newDocument();
{
Element root = document.createElement( "items" );
{
for ( byte i = 0, l = 10; l > i; ++i )
root.appendChild( this.CreateItemNode( document ) );
}
document.appendChild( root );
}
Transformer transformer = TransformerFactory.newInstance().newTransformer();
transformer.setOutputProperty( OutputKeys.INDENT, "yes" );
transformer.setOutputProperty( OutputKeys.METHOD, "xml" );
transformer.setOutputProperty( OutputKeys.ENCODING, "UTF-8" );
transformer.setOutputProperty( OutputKeys.STANDALONE, "yes" );
transformer.setOutputProperty( OutputKeys.VERSION, "1.0" );
transformer.transform( new DOMSource( document ), new StreamResult( xmlFile ) );
return xmlFile.getAbsolutePath();
}
/**
*
* @param document
* @return
*/
private Element CreateItemNode( Document document ) {
Element item = document.createElement( "item" );
item.setAttribute( "UUID", UUID.randomUUID().toString() );
item.appendChild( this.CreateTextNode( document, "date", Math.random() + "" ) );
item.appendChild( this.CreateTextNode( document, "time", new Random().nextLong() + "" ) );
item.appendChild( this.CreateTextNode( document, "text", System.currentTimeMillis() + "" ) );
item.appendChild( this.CreateTextNode( document, "tag", "<tag>value</tag>" ) );
item.appendChild( this.CreateTextNode( document, "url", "http://pan.baidu.com/disk/home#path=%252FCode" ) );
item.appendChild( this.CreateTextNode( document, "sign", "`~1!@#$%^&*()_+=-{}[]/\\|\"" ) );
return item;
}
/**
*
* @param document
* @param tag
* @param value
* @return
*/
private Element CreateTextNode( Document document, String tag, String value ) {
Element element = document.createElement( tag );
element.appendChild( document.createTextNode( value ) );
return element;
}
}