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    java友情鏈接

    閱讀排行榜

    評(píng)論排行榜

    DOM4J使用總結(jié)

    ?DOM4J是dom4j.org出品的一個(gè)開源XML解析包,它的網(wǎng)站中這樣定義:

    Dom4j is an easy to use, open source library for working with XML, XPath and XSLT on the Java platform using the Java Collections Framework and with full support for DOM, SAX and JAXP.

    下載地址:http://sourceforge.net/project/showfiles.php?group_id=16035??

    Dom4j是一個(gè)易用的、開源的庫(kù),用于XML,XPath和XSLT。它應(yīng)用于Java平臺(tái),采用了Java集合框架并完全支持DOM,SAX和JAXP。

    DOM4J使用起來(lái)非常簡(jiǎn)單。只要你了解基本的XML-DOM模型,就能使用。然而他自己帶的指南只有短短一頁(yè)(html),不過(guò)說(shuō)的到挺全。國(guó)內(nèi)的中文資料很少。因而俺寫這個(gè)短小的教程方便大家使用,這篇文章僅談及基本的用法,如需深入的使用,請(qǐng)……自己摸索或查找別的資料。

    之前看過(guò)IBM developer社區(qū)的文章(參見附錄),提到一些XML解析包的性能比較,其中DOM4J的性能非常出色,在多項(xiàng)測(cè)試中名列前茅。(事實(shí)上DOM4J的官方文檔中也引用了這個(gè)比較)所以這次的項(xiàng)目中我采用了DOM4J作為XML解析工具。

    在國(guó)內(nèi)比較流行的是使用JDOM作為解析器,兩者各擅其長(zhǎng),但DOM4J最大的特色是使用大量的接口,這也是它被認(rèn)為比JDOM靈活的主要原因。大師不是說(shuō)過(guò)么,“面向接口編程”。目前使用DOM4J的已經(jīng)越來(lái)越多。如果你善于使用JDOM,不妨繼續(xù)用下去,只看看本篇文章作為了解與比較,如果你正要采用一種解析器,不如就用DOM4J吧。

    它的主要接口都在org.dom4j這個(gè)包里定義:

    Attribute

    Attribute定義了XML的屬性

    Branch

    Branch為能夠包含子節(jié)點(diǎn)的節(jié)點(diǎn)如XML元素(Element)和文檔(Docuemnts)定義了一個(gè)公共的行為,

    CDATA

    CDATA 定義了XML CDATA 區(qū)域

    CharacterData

    CharacterData是一個(gè)標(biāo)識(shí)借口,標(biāo)識(shí)基于字符的節(jié)點(diǎn)。如CDATA,Comment, Text.

    Comment

    Comment 定義了XML注釋的行為

    Document

    定義了XML文檔

    DocumentType

    DocumentType 定義XML DOCTYPE聲明

    Element

    Element定義XML 元素

    ElementHandler

    ElementHandler定義了 Element 對(duì)象的處理器

    ElementPath

    被 ElementHandler 使用,用于取得當(dāng)前正在處理的路徑層次信息

    Entity

    Entity定義 XML entity

    Node

    Node為所有的dom4j中XML節(jié)點(diǎn)定義了多態(tài)行為

    NodeFilter

    NodeFilter 定義了在dom4j節(jié)點(diǎn)中產(chǎn)生的一個(gè)濾鏡或謂詞的行為(predicate)

    ProcessingInstruction

    ProcessingInstruction 定義 XML 處理指令.

    Text

    Text 定義XML 文本節(jié)點(diǎn).

    Visitor

    Visitor 用于實(shí)現(xiàn)Visitor模式.

    XPath

    XPath 在分析一個(gè)字符串后會(huì)提供一個(gè)XPath 表達(dá)式

    看名字大致就知道它們的涵義如何了。

    要想弄懂這套接口,關(guān)鍵的是要明白接口的繼承關(guān)系:

    ??? * interface java.lang.Cloneable
    ????????? o interface org.dom4j.Node

    ??????????????? + interface org.dom4j.Attribute
    ??????????????? + interface org.dom4j.Branch

    ????????????????????? # interface org.dom4j.Document
    ????????????????????? # interface org.dom4j.Element
    ??????????????? + interface org.dom4j.CharacterData
    ????????????????????? # interface org.dom4j.CDATA
    ????????????????????? # interface org.dom4j.Comment
    ????????????????????? # interface org.dom4j.Text
    ??????????????? + interface org.dom4j.DocumentType
    ??????????????? + interface org.dom4j.Entity
    ??????????????? + interface org.dom4j.ProcessingInstruction

    一目了然,很多事情都清楚了。大部分都是由Node繼承來(lái)的。知道這些關(guān)系,將來(lái)寫程序就不會(huì)出現(xiàn)ClassCastException了。

    下面給出一些例子(部分摘自DOM4J自帶的文檔),簡(jiǎn)單說(shuō)一下如何使用。

    1.????????????? 讀取并解析XML文檔:

    讀寫XML文檔主要依賴于org.dom4j.io包,其中提供DOMReader和SAXReader兩類不同方式,而調(diào)用方式是一樣的。這就是依靠接口的好處。?

    ???

    ? // ?從文件讀取XML,輸入文件名,返回XML文檔

    ????
    public ?Document?read(String?fileName)? throws ?MalformedURLException,?DocumentException? {

    ???????SAXReader?reader?
    = ? new ?SAXReader();

    ???????Document?document?
    = ?reader.read( new ?File(fileName));

    ???????
    return ?document;

    ????}

    其中,reader的read方法是重載的,可以從InputStream, File, Url等多種不同的源來(lái)讀取。得到的Document對(duì)象就帶表了整個(gè)XML。

    根據(jù)本人自己的經(jīng)驗(yàn),讀取的字符編碼是按照XML文件頭定義的編碼來(lái)轉(zhuǎn)換。如果遇到亂碼問(wèn)題,注意要把各處的編碼名稱保持一致即可。

    2.??? 取得Root節(jié)點(diǎn)

    讀取后的第二步,就是得到Root節(jié)點(diǎn)。熟悉XML的人都知道,一切XML分析都是從Root元素開始的。

     

    ?? public ?Element?getRootElement(Document?doc) {

    ???????
    return ?doc.getRootElement();

    ????}

    3.??? 遍歷XML樹

    DOM4J提供至少3種遍歷節(jié)點(diǎn)的方法:

    1) 枚舉(Iterator)

    ???

    // ?枚舉所有子節(jié)點(diǎn)

    ????
    for ?(?Iterator?i? = ?root.elementIterator();?i.hasNext();?)? {

    ???????Element?element?
    = ?(Element)?i.next();

    ???????
    // ?do?something

    ????}


    ????
    // ?枚舉名稱為foo的節(jié)點(diǎn)

    ????
    for ?(?Iterator?i? = ?root.elementIterator(foo);?i.hasNext();)? {

    ???????Element?foo?
    = ?(Element)?i.next();

    ???????
    // ?do?something

    ????}


    ????
    // ?枚舉屬性

    ????
    for ?(?Iterator?i? = ?root.attributeIterator();?i.hasNext();?)? {

    ???????Attribute?attribute?
    = ?(Attribute)?i.next();

    ???????
    // ?do?something

    ????}

    2)遞歸

    遞歸也可以采用Iterator作為枚舉手段,但文檔中提供了另外的做法?

    ???

    ? public ? void ?treeWalk()? {

    ???????treeWalk(getRootElement());

    ????}


    ????
    public ? void ?treeWalk(Element?element)? {

    ???????
    for ?( int ?i? = ? 0 ,?size? = ?element.nodeCount();?i? < ?size;?i ++ )????? {

    ???????????Node?node?
    = ?element.node(i);

    ???????????
    if ?(node? instanceof ?Element)? {

    ??????????????treeWalk((Element)?node);

    ???????????}
    ? else ? {? // ?do?something.

    ???????????}


    ???????}


    }

    ?

    3) Visitor模式

    最令人興奮的是DOM4J對(duì)Visitor的支持,這樣可以大大縮減代碼量,并且清楚易懂。了解設(shè)計(jì)模式的人都知道,Visitor是GOF設(shè)計(jì)模式之一。其主要原理就是兩種類互相保有對(duì)方的引用,并且一種作為Visitor去訪問(wèn)許多Visitable。我們來(lái)看DOM4J中的Visitor模式(快速文檔中沒(méi)有提供)

    只需要自定一個(gè)類實(shí)現(xiàn)Visitor接口即可。?

    ? public ? class ?MyVisitor? extends ?VisitorSupport? {

    ???????????
    public ? void ?visit(Element?element) {

    ???????????????System.out.println(element.getName());

    ???????????}


    ???????????
    public ? void ?visit(Attribute?attr) {

    ???????????????System.out.println(attr.getName());

    ???????????}


    ????????}

    ?? 調(diào)用:? root.accept(new MyVisitor())

    ??? Visitor接口提供多種Visit()的重載,根據(jù)XML不同的對(duì)象,將采用不同的方式來(lái)訪問(wèn)。上面是給出的Element和Attribute的簡(jiǎn)單實(shí)現(xiàn),一般比較常用的就是這兩個(gè)。VisitorSupport是DOM4J提供的默認(rèn)適配器,Visitor接口的Default Adapter模式,這個(gè)模式給出了各種visit(*)的空實(shí)現(xiàn),以便簡(jiǎn)化代碼。

    ??? 注意,這個(gè)Visitor是自動(dòng)遍歷所有子節(jié)點(diǎn)的。如果是root.accept(MyVisitor),將遍歷子節(jié)點(diǎn)。我第一次用的時(shí)候,認(rèn)為是需要自己遍歷,便在遞歸中調(diào)用Visitor,結(jié)果可想而知。

    4. XPath支持

    ??? DOM4J對(duì)XPath有良好的支持,如訪問(wèn)一個(gè)節(jié)點(diǎn),可直接用XPath選擇。

    ??

    ? public ? void ?bar(Document?document)? {

    ????????List?list?
    = ?document.selectNodes(? // foo/bar?);

    ????????Node?node?
    = ?document.selectSingleNode( // foo/bar/author);

    ????????String?name?
    = ?node.valueOf(?@name?);

    ?????}

    ??? 例如,如果你想查找XHTML文檔中所有的超鏈接,下面的代碼可以實(shí)現(xiàn):

    ??

    ?? public ? void ?findLinks(Document?document)? throws ?DocumentException? {

    ????????List?list?
    = ?document.selectNodes(? // a/@href?);

    ????????
    for ?(Iterator?iter? = ?list.iterator();?iter.hasNext();?)? {

    ????????????Attribute?attribute?
    = ?(Attribute)?iter.next();

    ????????????String?url?
    = ?attribute.getValue();

    ????????}


    ?????}

    5. 字符串與XML的轉(zhuǎn)換

    有時(shí)候經(jīng)常要用到字符串轉(zhuǎn)換為XML或反之,

    ???

    ? // ?XML轉(zhuǎn)字符串?

     ?Document?document?
    = ?;

    ????String?text?
    = ?document.asXML();

    // ?字符串轉(zhuǎn)XML

    ????String?text?
    = ? < person > ? < name > James </ name > ? </ person > ;

    ????Document?document?
    = ?DocumentHelper.parseText(text);

    6 用XSLT轉(zhuǎn)換XML

    ? public ?Document?styleDocument(

    ???????Document?document,

    ???????String?stylesheet

    ????)?
    throws ?Exception? {

    ????
    // ?load?the?transformer?using?JAXP

    ????TransformerFactory?factory?
    = ?TransformerFactory.newInstance();

    ????Transformer?transformer?
    = ?factory.newTransformer(

    ???????
    new ?StreamSource(?stylesheet?)

    ????);

    ????
    // ?now?lets?style?the?given?document

    ????DocumentSource?source?
    = ? new ?DocumentSource(?document?);

    ????DocumentResult?result?
    = ? new ?DocumentResult();

    ????transformer.transform(?source,?result?);

    ????
    // ?return?the?transformed?document

    ????Document?transformedDoc?
    = ?result.getDocument();

    ????
    return ?transformedDoc;

    }

    ?7. 創(chuàng)建XML

    ? 一般創(chuàng)建XML是寫文件前的工作,這就像StringBuffer一樣容易。

    public ?Document?createDocument()? {

    ???????Document?document?
    = ?DocumentHelper.createDocument();

    ???????Element?root?
    = ?document.addElement(root);

    ???????Element?author1?
    =

    ???????????root

    ??????????????.addElement(author)

    ??????????????.addAttribute(name,?James)

    ??????????????.addAttribute(location,?UK)

    ??????????????.addText(James?Strachan);

    ???????Element?author2?
    =

    ???????????root

    ??????????????.addElement(author)

    ??????????????.addAttribute(name,?Bob)

    ??????????????.addAttribute(location,?US)

    ??????????????.addText(Bob?McWhirter);

    ???????
    return ?document;

    ????}

    ?8. 文件輸出

    ??? 一個(gè)簡(jiǎn)單的輸出方法是將一個(gè)Document或任何的Node通過(guò)write方法輸出

    ???

    FileWriter?out? = ? new ?FileWriter(?foo.xml?);

    ????document.write(out);

    如果你想改變輸出的格式,比如美化輸出或縮減格式,可以用XMLWriter類

    public ? void ?write(Document?document)? throws ?IOException? {

    ???????
    // ?指定文件

    ???????XMLWriter?writer?
    = ? new ?XMLWriter(

    ???????????
    new ?FileWriter(?output.xml?)

    ???????);

    ???????writer.write(?document?);

    ???????writer.close();

    ???????
    // ?美化格式

    ???????OutputFormat?format?
    = ?OutputFormat.createPrettyPrint();

    ???????writer?
    = ? new ?XMLWriter(?System.out,?format?);

    ???????writer.write(?document?);

    ???????
    // ?縮減格式

    ???????format?
    = ?OutputFormat.createCompactFormat();

    ???????writer?
    = ? new ?XMLWriter(?System.out,?format?);

    ???????writer.write(?document?);

    ????}


    ?如何,DOM4J夠簡(jiǎn)單吧,當(dāng)然,還有一些復(fù)雜的應(yīng)用沒(méi)有提到,如ElementHandler等。如果你動(dòng)心了,那就一起來(lái)用DOM4J.

    DOM4J官方網(wǎng)站:

    http://www.dom4j.org

    DOM4J下載(SourceForge),最新版本為1.4

    http://sourceforge.net/projects/dom4j

    參考資料:

    DOM4J文檔

    Java 中的 XML:文檔模型,第一部分:性能

    http://www-900.ibm.com/developerWorks/cn/xml/x-injava/index.shtml

    Java 中的 XML:Java 文檔模型的用法

    http://www-900.ibm.com/developerWorks/cn/xml/x-injava2/index.shtml

    Java XML API 漫談 by robbin

    http://www.hibernate.org.cn:8000/137.html

    附件:

    package ?org.test;

    import ?java.io.File;
    import ?java.io.FileWriter;
    import ?java.util.Iterator;
    import ?java.util.List;

    import ?org.dom4j.Attribute;
    import ?org.dom4j.Document;
    import ?org.dom4j.DocumentException;
    import ?org.dom4j.DocumentHelper;
    import ?org.dom4j.Element;
    import ?org.dom4j.io.OutputFormat;
    import ?org.dom4j.io.SAXReader;
    import ?org.dom4j.io.XMLWriter;

    public ? class ?TestDom4J? {

    ????
    private ?Document?document? = ? null ;

    ????
    private ?String?filePath? = ? null ;

    ????
    public ?TestDom4J()? {
    ????}


    ????
    public ?TestDom4J(String?filePath)? {
    ????????
    this .filePath? = ?filePath;
    ????}


    ????
    private ?Document?parse()? throws ?DocumentException? {
    ????????SAXReader?reader?
    = ? new ?SAXReader();
    ????????Document?document?
    = ?reader.read(filePath);
    ????????
    return ?document;
    ????}


    ????
    public ? void ?backup()? throws ?Exception? {
    ????????document?
    = ?parse();
    ????????Element?rootElement?
    = ?document.getRootElement();
    ????????rootElement.addElement(
    " friend_list " ).addText( " nihao " );
    ????????saveToFile();
    ????}


    ????
    private ? void ?saveToFile()? {
    ????????
    try ? {
    ????????????
    // ?美化輸出
    ????????????OutputFormat?format? = ?OutputFormat.createPrettyPrint();
    ????????????
    // ?設(shè)置字符編碼
    ????????????format.setEncoding( " GB2312 " );
    ????????????XMLWriter?writer?
    = ? new ?XMLWriter( new ?FileWriter(filePath),?format);
    ????????????writer.write(document);
    ????????????writer.close();
    ????????}
    ? catch ?(Exception?e)? {
    ????????}

    ????}


    ????
    public ? static ? void ?main(String[]?args)? throws ?Exception? {
    ????????TestDom4J?test?
    = ? new ?TestDom4J( " first.xml " );
    ????????test.backup();
    ????????test.createXMLFile(
    " first.xml " );
    ????????test.ModiXMLFile(
    " first.xml " ,? " firstNew.xml " );
    ????}


    ????
    /**
    ?????*?
    ?????*?建立一個(gè)XML文檔,文檔名由輸入屬性決定
    ?????*?
    ?????*?
    @param ?filename
    ?????*????????????需建立的文件名
    ?????*?
    ?????*?
    @return ?返回操作結(jié)果,?0表失敗,?1表成功
    ?????*?
    ?????
    */

    ????
    public ? int ?createXMLFile(String?filename)? {
    ????????
    /** ?返回操作結(jié)果,?0表失敗,?1表成功? */
    ????????
    int ?returnValue? = ? 0 ;
    ????????
    /** ?建立document對(duì)象? */
    ????????Document?document?
    = ?DocumentHelper.createDocument();
    ????????
    /** ?建立XML文檔的根books? */
    ????????Element?booksElement?
    = ?document.addElement( " books " );
    ????????
    /** ?加入一行注釋? */
    ????????booksElement.addComment(
    " 這是dom4j的一個(gè)測(cè)試,?2004.9.11 " );
    ????????
    /** ?加入第一個(gè)book節(jié)點(diǎn)? */
    ????????Element?bookElement?
    = ?booksElement.addElement( " book " );
    ????????
    /** ?加入show屬性內(nèi)容? */
    ????????bookElement.addAttribute(
    " show " ,? " yes " );
    ????????
    /** ?加入title節(jié)點(diǎn)? */
    ????????Element?titleElement?
    = ?bookElement.addElement( " title " );
    ????????
    /** ?為title設(shè)置內(nèi)容? */
    ????????titleElement.setText(
    " Dom4j?Tutorials " );
    ????????
    /** ?類似的完成后兩個(gè)book? */
    ????????bookElement?
    = ?booksElement.addElement( " book " );
    ????????bookElement.addAttribute(
    " show " ,? " yes " );
    ????????titleElement?
    = ?bookElement.addElement( " title " );
    ????????titleElement.setText(
    " Lucene?Studing " );
    ????????bookElement?
    = ?booksElement.addElement( " book " );
    ????????bookElement.addAttribute(
    " show " ,? " no " );
    ????????titleElement?
    = ?bookElement.addElement( " title " );
    ????????titleElement.setText(
    " Lucene?in?Action " );
    ????????
    /** ?加入owner節(jié)點(diǎn)? */
    ????????Element?ownerElement?
    = ?booksElement.addElement( " owner " );
    ????????ownerElement.setText(
    " 張華平 " );
    ????????
    try ? {
    ????????????
    // ?美化輸出
    ????????????OutputFormat?format? = ?OutputFormat.createPrettyPrint();
    ????????????
    // ?設(shè)置字符編碼
    ????????????format.setEncoding( " GB2312 " );
    ????????????
    /** ?將document中的內(nèi)容寫入文件中? */
    ????????????XMLWriter?writer?
    = ? new ?XMLWriter(
    ????????????????????
    new ?FileWriter( new ?File(filename)),?format);
    ????????????writer.write(document);
    ????????????writer.close();
    ????????????
    /** ?執(zhí)行成功,需返回1? */
    ????????????returnValue?
    = ? 1 ;
    ????????}
    ? catch ?(Exception?ex)? {
    ????????????ex.printStackTrace();
    ????????????returnValue?
    = ? 0 ;
    ????????}

    ????????
    return ?returnValue;
    ????}


    ????
    /**
    ?????*?
    ?????*?修改XML文件中內(nèi)容,并另存為一個(gè)新文件
    ?????*?
    ?????*?重點(diǎn)掌握dom4j中如何添加節(jié)點(diǎn),修改節(jié)點(diǎn),刪除節(jié)點(diǎn)
    ?????*?
    ?????*?
    @param ?filename
    ?????*????????????修改對(duì)象文件
    ?????*?
    ?????*?
    @param ?newfilename
    ?????*????????????修改后另存為該文件
    ?????*?
    ?????*?
    @return ?返回操作結(jié)果,?0表失敗,?1表成功
    ?????*?
    ?????
    */

    ????
    public ? int ?ModiXMLFile(String?filename,?String?newfilename)? {
    ????????
    int ?returnValue? = ? 0 ;
    ????????
    try ? {
    ????????????SAXReader?saxReader?
    = ? new ?SAXReader();
    ????????????Document?document?
    = ?saxReader.read( new ?File(filename));
    ????????????
    /** ?修改內(nèi)容之一:?如果book節(jié)點(diǎn)中show屬性的內(nèi)容為yes,則修改成no? */
    ????????????
    /** ?先用xpath查找對(duì)象? */
    ????????????List?list?
    = ?document.selectNodes( " /books/book/@show " );
    ????????????Iterator?iter?
    = ?list.iterator();
    ????????????
    while ?(iter.hasNext())? {
    ????????????????Attribute?attribute?
    = ?(Attribute)?iter.next();
    ????????????????
    if ?(attribute.getValue().equals( " yes " ))? {
    ????????????????????attribute.setValue(
    " no " );
    ????????????????}

    ????????????}

    ????????????
    /**
    ?????????????*?
    ?????????????*?修改內(nèi)容之二:?把owner項(xiàng)內(nèi)容改為Tshinghua
    ?????????????*?
    ?????????????*?并在owner節(jié)點(diǎn)中加入date節(jié)點(diǎn),date節(jié)點(diǎn)的內(nèi)容為2004-09-11,還為date節(jié)點(diǎn)添加一個(gè)屬性type
    ?????????????*?
    ?????????????
    */

    ????????????list?
    = ?document.selectNodes( " /books/owner " );
    ????????????iter?
    = ?list.iterator();
    ????????????
    if ?(iter.hasNext())? {
    ????????????????Element?ownerElement?
    = ?(Element)?iter.next();
    ????????????????ownerElement.setText(
    " Tshinghua " );
    ????????????????Element?dateElement?
    = ?ownerElement.addElement( " date " );
    ????????????????dateElement.setText(
    " 2004-09-11 " );
    ????????????????dateElement.addAttribute(
    " type " ,? " Gregorian?calendar " );
    ????????????}

    ????????????
    /** ?修改內(nèi)容之三:?若title內(nèi)容為Dom4j?Tutorials,則刪除該節(jié)點(diǎn)? */
    ????????????list?
    = ?document.selectNodes( " /books/book " );
    ????????????iter?
    = ?list.iterator();
    ????????????
    while ?(iter.hasNext())? {
    ????????????????Element?bookElement?
    = ?(Element)?iter.next();
    ????????????????Iterator?iterator?
    = ?bookElement.elementIterator( " title " );
    ????????????????
    while ?(iterator.hasNext())? {
    ????????????????????Element?titleElement?
    = ?(Element)?iterator.next();
    ????????????????????
    if ?(titleElement.getText().equals( " Dom4j?Tutorials " ))? {
    ????????????????????????bookElement.remove(titleElement);
    ????????????????????}

    ????????????????}

    ????????????}

    ????????????
    try ? {
    ????????????????
    // ?美化輸出
    ????????????????OutputFormat?format? = ?OutputFormat.createPrettyPrint();
    ????????????????
    // ?設(shè)置字符編碼
    ????????????????format.setEncoding( " GB2312 " );
    ????????????????
    /** ?將document中的內(nèi)容寫入文件中? */
    ????????????????XMLWriter?writer?
    = ? new ?XMLWriter( new ?FileWriter( new ?File(
    ????????????????????????newfilename)),?format);
    ????????????????writer.write(document);
    ????????????????writer.close();
    ????????????????
    /** ?執(zhí)行成功,需返回1? */
    ????????????????returnValue?
    = ? 1 ;
    ????????????}
    ? catch ?(Exception?ex)? {
    ????????????????ex.printStackTrace();
    ????????????}

    ????????}
    ? catch ?(Exception?ex)? {
    ????????????ex.printStackTrace();
    ????????}

    ????????
    return ?returnValue;
    ????}

    }


    posted on 2006-10-12 10:23 捕風(fēng) 閱讀(386) 評(píng)論(0)  編輯  收藏 所屬分類: xml應(yīng)用

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