XML 实用工具类

王朝java/jsp·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

package com.elink.util;

/*

* <p>Company: 凌科软件 www.elingke.com </p>

* @author liubaojun

* @version 1.0

* Created on 2004-11-29

* 来源于 elinkBSP 部分源代码

*/

import java.io.*;

import java.util.*;

import javax.xml.parsers.*;

import javax.xml.transform.*;

import javax.xml.transform.dom.*;

import javax.xml.transform.stream.*;

import org.w3c.dom.*;

import org.xml.sax.*;

public class XmlUtil

{

public static synchronized Document newDocument()

{

Document doc = null;

try

{

DocumentBuilder db = DocumentBuilderFactory.newInstance().

newDocumentBuilder();

doc = db.newDocument();

}

catch (Exception e)

{

LogUtil.logException( e );

}

return doc;

}

public static synchronized Element createRootElement()

{

Element rootElement = null;

try

{

DocumentBuilder db = DocumentBuilderFactory.newInstance().

newDocumentBuilder();

Document doc = db.newDocument();

rootElement = doc.getDocumentElement();

}

catch (Exception e)

{

e.printStackTrace();

}

return rootElement;

}

public static synchronized Element getRootElement(String fileName)

{

if (fileName == null || fileName.length() == 0)

{

return null;

}

try

{

Element rootElement = null;

FileInputStream fis = new FileInputStream(fileName);

rootElement = getRootElement(fis);

fis.close();

return rootElement;

}

catch (Exception e)

{

return null;

}

}

public static synchronized Element getRootElement(InputStream is)

{

if (is == null)

{

return null;

}

Element rootElement = null;

try

{

DocumentBuilder db = DocumentBuilderFactory.newInstance().

newDocumentBuilder();

Document doc = db.parse(is);

rootElement = doc.getDocumentElement();

}

catch (Exception e)

{

e.printStackTrace();

}

return rootElement;

}

public static synchronized Element getRootElement(InputSource is)

{

if (is == null)

{

return null;

}

Element rootElement = null;

try

{

DocumentBuilder db = DocumentBuilderFactory.newInstance().

newDocumentBuilder();

Document doc = db.parse(is);

rootElement = doc.getDocumentElement();

}

catch (Exception e)

{

e.printStackTrace();

}

return rootElement;

}

public static synchronized Element[] getChildElements(Element element)

{

if (element == null)

{

return null;

}

Vector childs = new Vector();

for (Node node = element.getFirstChild(); node != null;

node = node.getNextSibling())

{

if (node instanceof Element)

{

childs.add( (Element)node);

}

}

Element[] elmt = new Element[childs.size()];

childs.toArray(elmt);

return elmt;

}

public static synchronized Element[] getChildElements(Element element,

String childName)

{

if (element == null || childName == null || childName.length() == 0)

{

return null;

}

Vector childs = new Vector();

for (Node node = element.getFirstChild(); node != null;

node = node.getNextSibling())

{

if (node instanceof Element)

{

if (node.getNodeName().equals(childName))

{

childs.add( (Element)node);

}

}

}

Element[] elmt = new Element[childs.size()];

childs.toArray(elmt);

return elmt;

}

public static synchronized Node[] getChildNodes(Node node)

{

if (node == null)

{

return null;

}

Vector childs = new Vector();

for (Node n = node.getFirstChild(); n != null;

n = n.getNextSibling())

{

childs.add( (Element)n);

}

Node[] childNodes = new Element[childs.size()];

childs.toArray(childNodes);

return childNodes;

}

public static synchronized Element getChildElement(Element element,

String childName)

{

if (element == null || childName == null || childName.length() == 0)

{

return null;

}

Element childs = null;

for (Node node = element.getFirstChild(); node != null;

node = node.getNextSibling())

{

if (node instanceof Element)

{

if (node.getNodeName().equals(childName))

{

childs = (Element)node;

break;

}

}

}

return childs;

}

public static synchronized Element getChildElement(Element element)

{

if (element == null)

{

return null;

}

Element childs = null;

for (Node node = element.getFirstChild(); node != null;

node = node.getNextSibling())

{

if (node instanceof Element)

{

childs = (Element)node;

break;

}

}

return childs;

}

public static synchronized String[] getElenentValues(Element element)

{

if (element == null)

{

return null;

}

Vector childs = new Vector();

for (Node node = element.getFirstChild(); node != null;

node = node.getNextSibling())

{

if (node instanceof Text)

{

childs.add(node.getNodeValue());

}

}

String[] values = new String[childs.size()];

childs.toArray(values);

return values;

}

public static synchronized String getElenentValue(Element element)

{

if (element == null)

{

return null;

}

String retnStr = null;

for (Node node = element.getFirstChild(); node != null;

node = node.getNextSibling())

{

if (node instanceof Text)

{

String str = node.getNodeValue();

if (str == null || str.length() == 0

|| str.trim().length() == 0)

{

continue;

}

else

{

retnStr = str;

break;

}

}

}

return retnStr;

}

public static synchronized Element findElementByName(Element e, String name)

{

if (e == null || name == null || name.length() == 0)

{

return null;

}

String nodename = null;

Element[] childs = getChildElements(e);

for (int i = 0; i < childs.length; i++)

{

nodename = childs[i].getNodeName();

if (name.equals(nodename))

{

return childs[i];

}

}

for (int i = 0; i < childs.length; i++)

{

Element retn = findElementByName(childs[i], name);

if (retn != null)

{

return retn;

}

}

return null;

}

public static synchronized Element findElementByAttr(Element e, String attrName,

String attrVal)

{

return findElementByAttr( e, attrName, attrVal, true );

}

public static synchronized Element findElementByAttr(Element e, String attrName,

String attrVal, boolean dept)

{

if (e == null || attrName == null || attrName.length() == 0

|| attrVal == null || attrVal.length() == 0)

{

return null;

}

String tmpValue = null;

Element[] childs = getChildElements(e);

for (int i = 0; i < childs.length; i++)

{

tmpValue = childs[i].getAttribute(attrName);

if (attrVal.equals(tmpValue))

{

return childs[i];

}

}

if( dept )

{

for (int i = 0; i < childs.length; i++)

{

Element retn = findElementByAttr(childs[i], attrName, attrVal);

if (retn != null)

{

return retn;

}

}

}

return null;

}

public static synchronized String formatXml(Element e)

{

return formatXml(e, 0);

}

/**

* 格式化XML输出串.

*/

public static synchronized String formatXml(Element e, int indent)

{

indent++;

for (Node n = e.getFirstChild(); n != null; n = n.getNextSibling())

{

appendIndent(e, n, indent);

if (!n.getNodeName().equals("#text"))

{

formatXml( (Element)n, indent);

}

}

indent--;

appendIndent(e, indent);

return e.toString();

}

/**

* 在指定的节点前插入格式表示.

*/

private static synchronized void appendIndent(Element e, Node pos, int indent)

{

Document doc = e.getOwnerDocument();

if (indent == 0)

{

e.insertBefore(doc.createTextNode("\n"), pos);

}

for (int i = 0; i < indent; i++)

{

if (i == 0)

{

e.insertBefore(doc.createTextNode("\n\t"), pos);

}

else

{

e.insertBefore(doc.createTextNode("\t"), pos);

}

}

}

/**

* 追加格式表示.

*/

private static synchronized void appendIndent(Element e, int indent)

{

Document doc = e.getOwnerDocument();

if (indent == 0)

{

e.appendChild(doc.createTextNode("\n"));

}

for (int i = 0; i < indent; i++)

{

if (i == 0)

{

e.appendChild(doc.createTextNode("\n\t"));

}

else

{

e.appendChild(doc.createTextNode("\t"));

}

}

}

public static synchronized void setAttribute(Element e, String name, String value)

{

if (e == null || name == null || name.length() == 0 || value == null

|| value.length() == 0)

return;

else

e.setAttribute( name, value );

}

public static synchronized String getAttribute(Element e, String name)

{

return getAttribute( e, name, null );

}

public static synchronized String getAttribute(Element e, String name, String defval)

{

if( e == null || name == null || name.length()== 0 )

return defval;

else

return e.getAttribute(name);

}

public void transformerWrite( Element doc, String filename ) throws Exception

{

DOMSource doms = new DOMSource( doc );

File f = new File( filename );

StreamResult sr = new StreamResult( f );

transformerWrite( doms, sr );

}

public void transformerWrite( Element doc, File file ) throws Exception

{

DOMSource doms = new DOMSource( doc );

StreamResult sr = new StreamResult( file );

transformerWrite( doms, sr );

}

public void transformerWrite( Element doc, OutputStream outstream ) throws Exception

{

DOMSource doms = new DOMSource( doc );

StreamResult sr = new StreamResult( outstream );

transformerWrite( doms, sr );

}

public void transformerWrite( Element doc, Writer outwriter ) throws Exception

{

DOMSource doms = new DOMSource( doc );

StreamResult sr = new StreamResult( outwriter );

transformerWrite( doms, sr );

}

public void transformerWrite( DOMSource doms, StreamResult sr ) throws Exception

{

TransformerFactory tf = TransformerFactory.newInstance();

Transformer t = tf.newTransformer();

t.setOutputProperty( OutputKeys.ENCODING, "GBK" );

t.transform( doms, sr );

}

}

 
 
 
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