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Java XML教程(一)

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  sonnet.xml

这是在本教程中贯穿使用的示例 XML 文档。

Shakespeare

William

British

1564

1616

Sonnet 130

My mistress` eyes are nothing like the sun,

Coral is far more red than her lips red.

If snow be white, why then her breasts are dun,

If hairs be wires, black wires grow on her head.

I have seen roses damasked, red and white,

But no such roses see I in her cheeks.

And in some perfumes is there more delight

Than in the breath that from my mistress reeks.

I love to hear her speak, yet well I know

That music hath a far more pleasing sound.

I grant I never saw a goddess go,

My mistress when she walks, treads on the ground.

And yet, by Heaven, I think my love as rare

As any she belied with false compare.

sonnet.dtd

这是我们示例文档所用的 DTD。

domOne.java

这是我们的第一个 DOM 应用。它解析一个 XML 文档并将其内容输出到标准输出。

/*

* (C) Copyright IBM Corp. 1999 All rights reserved.

*

* US Government Users Restricted Rights Use, duplication or

* disclosure restricted by GSA ADP Schedule Contract with IBM Corp.

*

* The program is provided "as is" without any warranty express or

* implied, including the warranty of non-infringement and the implied

* warranties of merchantibility and fitness for a particular purpose.

* IBM will not be liable for any damages suffered by you as a result

* of using the Program. In no event will IBM be liable for any

* special, indirect or consequential damages or lost profits even if

* IBM has been advised of the possibility of their occurrence. IBM

* will not be liable for any third party claims against you.

*/

import java.io.OutputStreamWriter;

import java.io.PrintWriter;

import java.io.UnsupportedEncodingException;

import org.w3c.dom.Attr;

import org.w3c.dom.Document;

import org.w3c.dom.NamedNodeMap;

import org.w3c.dom.Node;

import org.w3c.dom.NodeList;

import com.ibm.xml.parsers.*;

/**

* domOne.java

* Illustrates how to go through a DOM tree.

*/

public class domOne

{

public void parseAndPrint(String uri)

{

Document doc = null;

try

{

DOMParser parser = new DOMParser();

parser.parse(uri);

doc = parser.getDocument();

}

catch (Exception e)

{

System.err.println("Sorry, an error occurred: " + e);

}

// We`ve parsed the document now, so let`s print it.

if (doc != null)

printDOMTree(doc);

}

/** Prints the specified node, then prints all of its children. */

public void printDOMTree(Node node)

{

int type = node.getNodeType();

switch (type)

{

// print the document element

case Node.DOCUMENT_NODE:

{

System.out.println("");

printDOMTree(((Document)node).getDocumentElement());

break;

}

// print element with attributes

case Node.ELEMENT_NODE:

{

System.out.print("<");

System.out.print(node.getNodeName());

NamedNodeMap attrs = node.getAttributes();

for (int i = 0; i ");

NodeList children = node.getChildNodes();

if (children != null)

{

int len = children.getLength();

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

printDOMTree(children.item(i));

}

break;

}

// handle entity reference nodes

case Node.ENTITY_REFERENCE_NODE:

{

System.out.print("&");

System.out.print(node.getNodeName());

System.out.print(";");

break;

}

// print cdata sections

case Node.CDATA_SECTION_NODE:

{

System.out.print("");

break;

}

// print text

case Node.TEXT_NODE:

{

System.out.print(node.getNodeValue());

break;

}

// print processing instruction

case Node.PROCESSING_INSTRUCTION_NODE:

{

System.out.print("");

break;

}

}

if (type == Node.ELEMENT_NODE)

{

System.out.println();

System.out.print("`);

}

}

/** Main program entry point. */

public static void main(String argv[])

{

if (argv.length == 0)

{

System.out.println("Usage: java domOne uri");

System.out.println(" where uri is the URI of the XML document you want to print.");

System.out.println(" Sample: java domOne sonnet.xml");

System.exit(1);

}

domOne d1 = new domOne();

d1.parseAndPrint(argv[0]);

}

}

domCounter.java

这段代码解析一个 XML 文档,然后遍历 DOM 树来采集有关该文档的数据。当数据采集后将其输出到标准输出。

/*

* (C) Copyright IBM Corp. 1999 All rights reserved.

*

* US Government Users Restricted Rights Use, duplication or

* disclosure restricted by GSA ADP Schedule Contract with IBM Corp.

*

* The program is provided "as is" without any warranty express or

* implied, including the warranty of non-infringement and the implied

* warranties of merchantibility and fitness for a particular purpose.

* IBM will not be liable for any damages suffered by you as a result

* of using the Program. In no event will IBM be liable for any

* special, indirect or consequential damages or lost profits even if

* IBM has been advised of the possibility of their occurrence. IBM

* will not be liable for any third party claims against you.

*/

import java.io.OutputStreamWriter;

import java.io.PrintWriter;

import java.io.UnsupportedEncodingException;

import org.w3c.dom.Document;

import org.w3c.dom.Node;

import org.w3c.dom.NodeList;

import com.ibm.xml.parsers.DOMParser;

/**

* domCounter.java

* This code creates a DOM parser, parses a document, then

* prints statistics about the number and type of nodes

* found in the document.

*/

public class domCounter

{

int documentNodes = 0;

int elementNodes = 0;

int entityReferenceNodes = 0;

int cdataSections = 0;

int textNodes = 0;

int processingInstructions = 0;

public void parseAndCount(String uri)

{

Document doc = null;

try

{

DOMParser parser = new DOMParser();

parser.parse(uri);

doc = parser.getDocument();

}

catch (Exception e)

{

System.err.println("Sorry, an error occurred: " + e);

}

// We`ve parsed the document now, so let`s scan the DOM tree and

// print the statistics.

if (doc != null)

{

scanDOMTree(doc);

System.out.println("Document Statistics for " + uri + ":");

System.out.println("====================================");

System.out.println("Document Nodes: " + documentNodes);

System.out.println("Element Nodes: " + elementNodes);

System.out.println("Entity Reference Nodes: " + entityReferenceNodes);

System.out.println("CDATA Sections: " + cdataSections);

System.out.println("Text Nodes: " + textNodes);

System.out.println("Processing Instructions: " + processingInstructions);

System.out.println(" ----------");

int totalNodes = documentNodes + elementNodes + entityReferenceNodes +

cdataSections + textNodes + processingInstructions;

System.out.println("Total: " + totalNodes + " Nodes");

}

}

/** Scans the DOM tree and counts the different types of nodes. */

public void scanDOMTree(Node node)

{

int type = node.getNodeType();

switch (type)

{

case Node.DOCUMENT_NODE:

documentNodes++;

scanDOMTree(((Document)node).getDocumentElement());

break;

TAG: Java JAVA java XML xml XMl Xml 教程
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