java 解析 XML

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XML Java .net Blog HTML

本文转自：
http://hi.baidu.com/zhanghaooy/blog/item/5636af098f3ce1c43bc76371.html

在读取XML数据的时候可以采用两种实现，可以灵活应用。

XML文件为：

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<?xml version="1.0" encoding="ISO-8859-1"?>
<bookstore>
    <book category="COOKING">
      <title lang="en">Everyday Italian</title>
      <author>Giada De Laurentiis</author>
      <year>2005</year>
      <price>30.00</price>
    </book>
    <book category="CHILDREN">
      <title lang="en">Harry Potter</title>
      <author>J K. Rowling</author>
      <year>2005</year>
      <price>29.99</price>
    </book>
    <book category="WEB">
      <title lang="en">XQuery Kick Start</title>
      <author>James McGovern</author>
      <year>2003</year>
      <price>49.99</price>
    </book>
    <book category="EEWEB">
      <title lang="en">Learning XML</title>
      <author>Erik T. Ray</author>
      <year>2003</year>
      <price>39.95</price>
    </book>
</bookstore>
<?xml version="1.0" encoding="ISO-8859-1"?>
<bookstore>
<book category="COOKING">
   <title lang="en">Everyday Italian</title>
   <author>Giada De Laurentiis</author>
   <year>2005</year>
   <price>30.00</price>
</book>
<book category="CHILDREN">
   <title lang="en">Harry Potter</title>
   <author>J K. Rowling</author>
   <year>2005</year>
   <price>29.99</price>
</book>
<book category="WEB">
   <title lang="en">XQuery Kick Start</title>
   <author>James McGovern</author>
   <year>2003</year>
   <price>49.99</price>
</book>
<book category="EEWEB">
   <title lang="en">Learning XML</title>
   <author>Erik T. Ray</author>
   <year>2003</year>
   <price>39.95</price>
</book>
</bookstore>

实现一：

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public static void readXML(String xmlFile){

        try {
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            DocumentBuilder db = dbf.newDocumentBuilder();
            Document doc = db.parse(xmlFile);
            Element root = doc.getDocumentElement();
            NodeList ndBooks = root.getElementsByTagName("book");
            NodeList ndTitles = root.getElementsByTagName("title");
            NodeList ndAuthors = root.getElementsByTagName("author");
            NodeList ndYears = root.getElementsByTagName("year");
            NodeList ndPrices = root.getElementsByTagName("price");
            if(ndBooks != null){
                for(int i=0;i<ndBooks.getLength();i++){
                    Node ndBook = ndBooks.item(i);
                    Node ndTitle = ndTitles.item(i);
                    Node ndAuthor = ndAuthors.item(i);
                    Node ndYear = ndYears.item(i);
                    Node ndPrice = ndPrices.item(i);
                    System.out.println(ndBook.getAttributes().getNamedItem("category").getNodeValue());
                    System.out.println(ndTitle.getAttributes().getNamedItem("lang").getNodeValue());
                    System.out.println(ndTitle.getFirstChild().getNodeValue());
                    System.out.println(ndAuthor.getFirstChild().getNodeValue());
                    System.out.println(ndYear.getFirstChild().getNodeValue());
                    System.out.println(ndPrice.getFirstChild().getNodeValue());
                    System.out.println("--------------------------------");
                }
            }
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        } catch (SAXException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
public static void readXML(String xmlFile){

   try {
    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    DocumentBuilder db = dbf.newDocumentBuilder();
    Document doc = db.parse(xmlFile);
    Element root = doc.getDocumentElement();
    NodeList ndBooks = root.getElementsByTagName("book");
    NodeList ndTitles = root.getElementsByTagName("title");
    NodeList ndAuthors = root.getElementsByTagName("author");
    NodeList ndYears = root.getElementsByTagName("year");
    NodeList ndPrices = root.getElementsByTagName("price");
    if(ndBooks != null){
     for(int i=0;i<ndBooks.getLength();i++){
      Node ndBook = ndBooks.item(i);
      Node ndTitle = ndTitles.item(i);
      Node ndAuthor = ndAuthors.item(i);
      Node ndYear = ndYears.item(i);
      Node ndPrice = ndPrices.item(i);
      System.out.println(ndBook.getAttributes().getNamedItem("category").getNodeValue());
      System.out.println(ndTitle.getAttributes().getNamedItem("lang").getNodeValue());
      System.out.println(ndTitle.getFirstChild().getNodeValue());
      System.out.println(ndAuthor.getFirstChild().getNodeValue());
      System.out.println(ndYear.getFirstChild().getNodeValue());
      System.out.println(ndPrice.getFirstChild().getNodeValue());
      System.out.println("--------------------------------");
     }
    }
   } catch (ParserConfigurationException e) {
    e.printStackTrace();
   } catch (SAXException e) {
    e.printStackTrace();
   } catch (IOException e) {
    e.printStackTrace();
   }
}

实现二：

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public static void readXML2(String xmlFile){
        try {
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            DocumentBuilder db = dbf.newDocumentBuilder();
            Document doc = db.parse(xmlFile);
            Element root = doc.getDocumentElement();//root 指向bookstore节点
            NodeList nls = root.getChildNodes();//nls指向bookstore的子节点book
            if(nls!= null){
                for(int i=0;i<nls.getLength();i++){
                    Node nd = nls.item(i);//输出每个book节点的category属性
                    if(nd.getNodeType() == Node.ELEMENT_NODE){
                        System.out.println("book:category:" + nd.getAttributes().getNamedItem("category").getNodeValue());
                    }
                    //以下遍历book节点的所有子节点
                    for(Node nde = nd.getFirstChild();nde!=null; nde = nde.getNextSibling()){
                        if(nde.getNodeType() == Node.ELEMENT_NODE){
                            //输出title节点值
                            if(nde.getNodeName().equals("title")){
                                System.out.println("----title:" + nde.getFirstChild().getNodeValue());
                            }
                            //输出author节点值
                            if(nde.getNodeName().equals("author")){
                                System.out.println("----author:" + nde.getFirstChild().getNodeValue());
                            }
                            //输出year节点值
                            if(nde.getNodeName().equals("year")){
                                System.out.println("----year:" + nde.getFirstChild().getNodeValue());
                            }
                            //输出price节点值
                            if(nde.getNodeName().equals("price")){
                                System.out.println("----price:" + nde.getFirstChild().getNodeValue());
                            }


                        }
                    }

                }
            }
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        } catch (SAXException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
public static void readXML2(String xmlFile){
   try {
    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    DocumentBuilder db = dbf.newDocumentBuilder();
    Document doc = db.parse(xmlFile);
    Element root = doc.getDocumentElement();//root 指向bookstore节点
    NodeList nls = root.getChildNodes();//nls指向bookstore的子节点book
    if(nls!= null){
     for(int i=0;i<nls.getLength();i++){
      Node nd = nls.item(i);//输出每个book节点的category属性
      if(nd.getNodeType() == Node.ELEMENT_NODE){
       System.out.println("book:category:" + nd.getAttributes().getNamedItem("category").getNodeValue());
      }
      //以下遍历book节点的所有子节点
      for(Node nde = nd.getFirstChild();nde!=null; nde = nde.getNextSibling()){
       if(nde.getNodeType() == Node.ELEMENT_NODE){
        //输出title节点值
        if(nde.getNodeName().equals("title")){
         System.out.println("----title:" + nde.getFirstChild().getNodeValue());
        }
        //输出author节点值
        if(nde.getNodeName().equals("author")){
         System.out.println("----author:" + nde.getFirstChild().getNodeValue());
        }
        //输出year节点值
        if(nde.getNodeName().equals("year")){
         System.out.println("----year:" + nde.getFirstChild().getNodeValue());
        }
        //输出price节点值
        if(nde.getNodeName().equals("price")){
         System.out.println("----price:" + nde.getFirstChild().getNodeValue());
        }


       }
      }

     }
    }
   } catch (ParserConfigurationException e) {
    e.printStackTrace();
   } catch (SAXException e) {
    e.printStackTrace();
   } catch (IOException e) {
    e.printStackTrace();
   }
}

第二种方法更可取些。注意理解

调用方法：

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public static void main(String[] args) {
    String xmlFile = "E:\\workspace_g2\\TT\\src、\\books.xml";
    readXML2(xmlFile);

    }
public static void main(String[] args) {
    String xmlFile = "E:\\workspace_g2\\TT\\src、\\books.xml";
    readXML2(xmlFile);

}

相关文章参见：

http://www.blogjava.net/lcs/archive/2007/11/21/162088.html

http://achievo-bruce-126-com.iteye.com/blog/221480

http://www.91linux.com/html/article/program/java/20070901/6639.html

http://blog.csdn.net/ydsakyclguozi/archive/2008/04/30/2347575.aspx

http://blog.csdn.net/java2000_net/archive/2008/11/06/3241167.aspx

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