一个可以完成读取、打印输出、保存xml等等功能的java例子

/*

* Created by IntelliJ IDEA.

* User: administrator

* Date: Mar 26, 2002

* Time: 1:24:56 PM

* To change template for new class use

* Code Style | Class Templates options (Tools | IDE Options).

*/

/*****readXml.java**********************

*This is a javabean.

*This bean read a xml file from a URL,and return a xmlDom

*

***** Created by Xiao Yusong2001-11-30 ****

*/

package com.chinacountry.util;

import java.util.*;

import java.net.URL;

import org.w3c.dom.*;

import javax.xml.parsers.*;

import java.io.*;

import org.apache.xml.serialize.OutputFormat;

import org.apache.xml.serialize.Serializer;

import org.apache.xml.serialize.SerializerFactory;

import org.apache.xml.serialize.XMLSerializer;

import org.xml.sax.InputSource;

public class xmlUtil implements java.io.Serializable {

public xmlUtil()

{

}

public static DocumentBuilder getBuilder()
throws ParserConfigurationException

{

DocumentBuilder builder = DocumentBuilderFactory.newInstance()
.newDocumentBuilder();

return builder;

}

// get a document from given file

public static Document getDocument(String path) throws Exception

{

// BufferedReader fileIn=new BufferedReader(new FileReader(path));

File f = new File(path);

DocumentBuilder builder = getBuilder();

Document doc = builder.parse(f);

return doc;

}

// get a document from InputStream

public static Document getDocument(InputStream in) throws Exception

{

DocumentBuilder builder = getBuilder();

Document doc = builder.parse(in);

return doc;

}

// create a empty document

public static Document getNewDoc() throws Exception

{

DocumentBuilder builder = getBuilder();

Document doc = builder.newDocument();

return doc;

}

// create a document from given string

public static Document getNewDoc(String xmlStr)

{

Document doc = null;

try

{

StringReader sr = new StringReader(xmlStr);

InputSource iSrc = new InputSource(sr);

DocumentBuilder builder = getBuilder();

doc = builder.parse(iSrc);

}

catch (Exception ex)

{

ex.printStackTrace();

}

return doc;

}

// save a document as a file at the given file path

public static void save(Document doc, String filePath)

{

try

{

OutputFormat format = new OutputFormat(doc);// Serialize DOM

format.setEncoding("GB2312");

StringWriter stringOut = new StringWriter();// Writer will be a
// String

XMLSerializer serial = new XMLSerializer(stringOut, format);

serial.asDOMSerializer();// As a DOM Serializer

serial.serialize(doc.getDocumentElement());

String STRXML = stringOut.toString(); // Spit out DOM as a String

String path = filePath;

writeXml(STRXML, path);

}

catch (Exception e)

{

e.printStackTrace();

}

}

// save a string(xml) in the given file path

public static void writeXml(String STRXML, String path)

{

try

{

File f = new File(path);

PrintWriter out = new PrintWriter(new FileWriter(f));

out.print(STRXML + "\n");

out.close();

}

catch (IOException e)

{

e.printStackTrace();

}

}

// format a document to string

public static String toString(Document doc)

{

String STRXML = null;

try

{

OutputFormat format = new OutputFormat(doc);// Serialize DOM

format.setEncoding("GB2312");

StringWriter stringOut = new StringWriter();// Writer will be a
// String

XMLSerializer serial = new XMLSerializer(stringOut, format);

serial.asDOMSerializer();// As a DOM Serializer

serial.serialize(doc.getDocumentElement());

STRXML = stringOut.toString(); // Spit out DOM as a String

}

catch (Exception e)

{

e.printStackTrace();

}

return STRXML;

}

// format a node to string

public static String toString(Node node, Document doc)

{

String STRXML = null;

try

{

OutputFormat format = new OutputFormat(doc);// Serialize DOM

format.setEncoding("GB2312");

StringWriter stringOut = new StringWriter();// Writer will be a
// String

XMLSerializer serial = new XMLSerializer(stringOut, format);

serial.asDOMSerializer();// As a DOM Serializer

serial.serialize((Element) node);

STRXML = stringOut.toString(); // Spit out DOM as a String

}

catch (Exception e)

{

e.printStackTrace();

}

return STRXML;

}

public static void main(String[] args) throws Exception

{

String pathRoot = "NeTrees.xml";

Document doc, doc1;

try

{

doc = xmlUtil.getDocument(pathRoot);

doc1 = xmlUtil.getDocument(pathRoot);

if (doc == doc1)

{

System.out.println("They aresame objects!");

}

else

{

System.out.println("They are different!");

OutputFormat format = new OutputFormat(doc);// Serialize DOM

format.setEncoding("GB2312");

StringWriter stringOut = new StringWriter();// Writer will be a
// String

XMLSerializer serial = new XMLSerializer(stringOut, format);

serial.asDOMSerializer();// As a DOM Serializer

serial.serialize(doc.getDocumentElement());

String STRXML = stringOut.toString(); // Spit out DOM as a
// String

System.out.println(STRXML);

}

}

catch (Exception ex)

{

System.out.print("Reading file\"" + pathRoot + "\" error!");

ex.printStackTrace();

}

}

}