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观察者模�?从�Q意数据结构生成XML解析器��生SAX事�g

Mon, 07 Aug 2006 01:16:00 GMT

在j2ee1.4标准教材里看��C��个很有趣的例�?从�Q意数据结构生成XML解析器��生SAX事�g.数据�l�构可以是文本文�?PDF格式文档�{?关键是自��p��析这些数据源.另外一个有意思的地方是观察者模式的应用.所以就�_�糙的改了一下�ƈ完整到可以测试运�?观察者模式简略UML�?

具体实现被观察者对象ParseXMLSubject�c?
package test;

import java.io.*;
import org.xml.sax.helpers.AttributesImpl;
import org.xml.sax.*;

public class ParseXMLSubject implements XMLReader {
ContentHandler handler;

    String nsu = "";
    Attributes atts = new AttributesImpl();
    String rootElement = "addressbook";
    String indent = "\n    ";

public ParseXMLSubject(){

}

    public ContentHandler getContentHandler() {
        return handler;
    }

    public void parse(InputSource input) throws IOException, SAXException {
        try {
            // Get an efficient reader for the file
            java.io.Reader r = input.getCharacterStream();
            BufferedReader br = new BufferedReader(r);

// Read the file and display it's contents.
String line = br.readLine();

            while (null != (line = br.readLine())) {
                if (line.startsWith("email:")) {
                    break;
                }
            }

            if (handler == null) {
                throw new SAXException("No content handler");
            }

            // Note:
            // We're ignoring setDocumentLocator(), as well
            handler.startDocument();
            handler.startElement(nsu, rootElement, rootElement, atts);

            output("email", line);
            line = br.readLine();
            output("html", line);
            line = br.readLine();
            output("firstname", line);
            line = br.readLine();
            output("lastname", line);
            line = br.readLine();
            output("work", line);
            line = br.readLine();
            output("home", line);
            line = br.readLine();
            output("fax", line);
            line = br.readLine();
            output("pager", line);
            line = br.readLine();
            output("cell", line);
            handler.ignorableWhitespace("\n".toCharArray(), 0, // start index
                                        1 // length
                    );
            handler.endElement(nsu, rootElement, rootElement);
            handler.endDocument();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

public void parse(String systemId) throws IOException, SAXException {
}

    public DTDHandler getDTDHandler() {
        return null;
    }

    public EntityResolver getEntityResolver() {
        return null;
    }

    public ErrorHandler getErrorHandler() {
        return null;
    }

    public boolean getFeature(String name) throws SAXNotRecognizedException,
            SAXNotSupportedException {
        return false;
    }

    public Object getProperty(String name) throws SAXNotRecognizedException,
            SAXNotSupportedException {
        return null;
    }

    public void setContentHandler(ContentHandler handler) {
        this.handler = handler;
    }

public void setDTDHandler(DTDHandler handler) {
}

public void setEntityResolver(EntityResolver resolver) {
}

public void setErrorHandler(ErrorHandler handler) {
}

    public void setFeature(String name, boolean value) throws
            SAXNotRecognizedException, SAXNotSupportedException {
    }

    public void setProperty(String name, Object value) throws
            SAXNotRecognizedException, SAXNotSupportedException {
    }

    void output(String name, String line) throws SAXException {
        int tmp = name.length();
        int startIndex=tmp+1;
        int textLength = line.length() - startIndex;
        String characters = line.substring(startIndex,line.length()-1);
        handler.ignorableWhitespace(indent.toCharArray(), 0, // start index
                                    indent.length());
        handler.startElement(nsu, name, name /*"qName"*/, atts);

        handler.characters(characters.toCharArray(), startIndex, textLength);
        handler.endElement(nsu, name, name);
    }

}

具体观察者对�? ConcreateObserver�c?br />package test;

import org.xml.sax.helpers.DefaultHandler;
import org.xml.sax.*;
public class ConcreateObserver extends DefaultHandler {
public ConcreateObserver() {
}

    public void startElement(String uri,
                         String localName,
                         String qName,
                         Attributes attributes)
                  throws SAXException{
              System.out.println("startElement: "+localName);
          }
          public void characters(char[] ch,
                                 int start,
                                 int length)
                throws SAXException{
            System.out.println("characters: ");
            System.out.print(ch);
            System.out.println();
        }
}

��试�c?TestMain
package test;
import java.io.*;
import org.xml.sax.InputSource;
public class TestMain {
    public TestMain() {
    }

    public static void main(String[] args) throws Exception {
        TestMain testmain = new TestMain();
        FileReader in = new FileReader(new File("d:\\AddressBookReaderLog01.txt"));

        ConcreateObserver observer=new ConcreateObserver();
        ParseXMLSubject parse = new ParseXMLSubject();
        parse.setContentHandler(observer);

parse.parse(new InputSource(in));
}
}

��试文本文档:AddressBookReaderLog01.txt

AddressBookReader01 ../samples/PersonalAddressBook.ldif
nickname: Fred
email: fred@barneys.house
html: TRUE
firstname: Fred
lastname: Flintstone
work: 999-Quarry
home: 999-BedrockLane
fax: 888-Squawk
pager: 777-pager
cell: 555-cell

另外一个也比较也有意思的地方��是具体观察者类从DefaultHandler �l�承,该类是缺省适配器模式的应用.
�Ƣ迎加入QQ��?30406099

�? �?/a> 2006-08-07 09:16 发表评论

用JAXP dom 构徏带名�U�空间的xml文档

Mon, 03 Jul 2006 01:10:00 GMT

�|�上好象关于如何构徏支持名称�I�间的xml文档的资料似乎�ƈ不多刚好啃过一下这斚w��的类�?也就�?br />Blog贴点,权当自己做了个笔�?.

先简要介�l�一下用到的�c�d��其方�?更详�l�的介绍只有看java api文档了    �?
DocumentBuilderFactory创徏DOM解析器的工厂调用其newInstance()�Ҏ(gu��)��实例�?然后用该实例创徏DocumentBuilder
实例该实例表�C�Z��个dom解析器       �?
DocumentBuilderFactory.setNamespaceAware(true); 提供�?XML 名称�I�间的支持�?br />DOMImplementation 允许用户用根Element的限定名�U�和XML命名�I�间创徏新Document
Document createDocument(String namespaceURI,String qualifiedName,     DocumentType doctype)throws DOMException创徏��h��文档元素的指定类型的 DOM Document 对象�?br /> 参数�Q��?namespaceURI - 要创建的文档元素的名�U�空�?URI �?null。�?qualifiedName - 要创建的文档元素的限定名�U�或 null�?br /> doctype - 要创建的文档的类型或 null。当 doctype 不是 null �Ӟ��?Node.ownerDocument 属性将被设�|��ؓ正在创徏的文档�?
�q�回�Q�具有文档元素的�?Document 对象。如�?NamespaceURI、qualifiedName �?doctype �?null�Q�则�q�回�?Document 为空的，不带有文档元�?br />Element getDocumentElement()�q�是一�U�便捷属性，该属性允许直接访问文档的文档元素的子节点�?br />Element createElementNS(String namespaceURI, String qualifiedName) throws DOMException创徏�l�定的限定名�U�和名称�I�间 URI 的元素。依�?[XML Namespaces]�Q�如果应用程序不希望使用名称�I�间�Q�则必须��?null 作�ؓ�Ҏ(gu��)��?namespaceURI 参数的倹{�?
参数�Q�namespaceURI - 要创建的元素的名�U�空�?URI。qualifiedName - 要实例化的元素类型的限定名称�?�q�回�Q�具有以下属性的�?Element 对象�Q?属�?�?Node.nodeName qualifiedName Node.namespaceURI namespaceURI Node.prefix 前缀�Q�从 qualifiedName 中提取的�Q�如果没有前�~��Q�则�?null Node.localName 本地名称�Q�从 qualifiedName 提取�?Element.tagName qualifiedName

Document对象的createAttributeNS Attr createAttributeNS(String namespaceURI, String qualifiedName) throws DOMException创徏�l�定的限定名�U�和名称�I�间 URI 的属性。对于每�?[XML Namespaces]�Q�如果应用程序希望没有名�U�空��_��则它们必��d�� null 作�ؓ�Ҏ(gu��)��?namespaceURI 参数的倹{�?参数�Q�namespaceURI - 要创建的属性的名称�I�间 URI。qualifiedName - 要实例化的属性的限定名称�?/p>

Element对象的setAttributeNS�Ҏ(gu��)�� void setAttributeNS(String namespaceURI, String qualifiedName, String value) throws DOMException throws DOMException ��d��新属�?namespaceURI - 要创建或更改的属性的名称�I�间 URI。qualifiedName - 要创建或更改的属性的限定名称。value - 以字�W�串形式讄��的倹{�?

import javax.xml.parsers.*;
import org.w3c.dom.*;
import javax.xml.transform.*;
import javax.xml.transform.stream.*;
import javax.xml.transform.dom.*;

class BuilderXML {
    public final static String SOAP_NS =
            "    public final static String MH_NS =
            "    public final static String XSD_NS = "    public final static String XSI_NS =
            "    public static void main(String[] args) throws Exception {
        BuilderXML builderxml = new BuilderXML();

        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();


        factory.setNamespaceAware(true);
        DocumentBuilder builder = factory.newDocumentBuilder();

DOMImplementation doIml = builder.getDOMImplementation();

        Document doc = doIml.createDocument(SOAP_NS, "soap:Envelop", null);


        Element root = doc.getDocumentElement();

        root.setAttribute("xmlns:soap", SOAP_NS);
        root.setAttribute("xmlns:mh", MH_NS);
        root.setAttribute("xmlns:xsd", XSD_NS);
        root.setAttribute("xmlns:xsi", XSI_NS);

        Element body = doc.createElementNS(SOAP_NS, "soap:Body");
        root.appendChild(body);
        Element getBookPrice = doc.createElementNS(MH_NS, "mh:getBookPrice");
        body.appendChild(getBookPrice);
        Element isbn = doc.createElementNS(MH_NS, "isbn");
        body.appendChild(isbn);
        Attr typeAttr = doc.createAttributeNS(XSI_NS, "xsi:type"); //attr 只能赋给element
        typeAttr.setValue("xsd:string");
        isbn.setAttributeNodeNS(typeAttr);
        isbn.setAttributeNS( MH_NS,"mh:tt","tt");

        //创徏CDATA�D?br />        CDATASection cdata=doc.createCDATASection("ttt");
          isbn.appendChild(cdata);
         // 创徏文本
          Text tt = doc.createTextNode("made two by hc");
          isbn.setNodeValue("made by hechang");
          isbn.appendChild(tt);
        Text text = doc.createTextNode("0311111");
        body.appendChild(text);
         //创徏注释
        Comment comment = doc.createComment(" written by hc ");
        doc.insertBefore(comment,root);
         //创徏转换器�ƈ��xml文档输出到输出流如果输出��是一个输出文件流,则生成一个文�?br />        Transformer t = TransformerFactory.newInstance().newTransformer();
        t.setOutputProperty("indent", "yes"); //讄��I�白输出

t.transform(new DOMSource(doc),
new StreamResult(System.out));

}
}

�E�序输出:
xmlns:xsd=" xmlns:xsi="

�? �?/a> 2006-07-03 09:10 发表评论