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递归xml解析并获取数据Java

[英]Recursive xml parsing and get data java

 原文  2013-03-23 17:30:35  5   1    java/ xml/ parsing/ xml-parsing/ playframework-2.0

问题描述

Good day! 美好的一天！ I can't find normal algorithm to paars xml and get data for my enteties. 我找不到正常的算法来处理xml并获取有关我的实体的数据。 So I have xml like this: 所以我有这样的XML： 

    <?xml version="1.0" encoding="UTF-8"?>
<export>
    <categories>
        <category>
            <idgr xmlns:type="string">bd72d90d-55bc-11d9-848a-00112f43529a</idgr>
            <namegr xmlns:type="string">Обувь</namegr>
            <categories>
                <category>
                    <idgr xmlns:type="string">bd72d90e-55bc-11d9-848a-00112f43529a</idgr>
                    <namegr xmlns:type="string">Женская обувь</namegr>
                    <categories>
                        <category>
                            <idgr xmlns:type="string">bd72d910-55bc-11d9-848a-00112f43529a</idgr>
                            <namegr xmlns:type="string">Женские ботфорты коричневые</namegr>
                        </category>
                        <category>
                            <idgr xmlns:type="string">bd72d913-55bc-11d9-848a-00112f43529a</idgr>
                            <namegr xmlns:type="string">Ботинки женские демисезонные</namegr>
                        </category>
                        <category>
                            <idgr xmlns:type="string">bd72d916-55bc-11d9-848a-00112f43529a</idgr>
                            <namegr xmlns:type="string">Ботинки женские натуральная кожа</namegr>
                        </category>
                        <category>
                            <idgr xmlns:type="string">bd72d91b-55bc-11d9-848a-00112f43529a</idgr>
                            <namegr xmlns:type="string">Женские босоножки</namegr>
                        </category>
                        <category>
                            <idgr xmlns:type="string">dee6e178-55bc-11d9-848a-00112f43529a</idgr>
                            <namegr xmlns:type="string">Женские модельные туфли</namegr>
                        </category>
                        <category>
                            <idgr xmlns:type="string">dee6e17b-55bc-11d9-848a-00112f43529a</idgr>
                            <namegr xmlns:type="string">Женские сапоги с искусственным мехом</namegr>
                        </category>
                        <category>
                            <idgr xmlns:type="string">e8a71f9a-55bc-11d9-848a-00112f43529a</idgr>
                            <namegr xmlns:type="string">Женские туфли-мокасины</namegr>
                        </category>
                        <category>
                            <idgr xmlns:type="string">e8a71fa7-55bc-11d9-848a-00112f43529a</idgr>
                            <namegr xmlns:type="string">Женские сапоги с натуральным мехом</namegr>
                        </category>
                        <category>
                            <idgr xmlns:type="string">e8a71fa9-55bc-11d9-848a-00112f43529a</idgr>
                            <namegr xmlns:type="string">Сапоги жен. низкие</namegr>
                        </category>
                        <category>
                            <idgr xmlns:type="string">e8a71faf-55bc-11d9-848a-00112f43529a</idgr>
                            <namegr xmlns:type="string">Сапоги жен высокие</namegr>
                        </category>
                        <category>
                            <idgr xmlns:type="string">e8a71fb3-55bc-11d9-848a-00112f43529a</idgr>
                            <namegr xmlns:type="string">Женские туфли</namegr>
                        </category>
                        <category>
                            <idgr xmlns:type="string">e8a71fb7-55bc-11d9-848a-00112f43529a</idgr>
                            <namegr xmlns:type="string">Полусапожки на шнурках</namegr>
                        </category>
                    </categories>
                </category>
                <category>
                    <idgr xmlns:type="string">dee6e186-55bc-11d9-848a-00112f43529a</idgr>
                    <namegr xmlns:type="string">Мужская обувь</namegr>
                    <categories>
                        <category>
                            <idgr xmlns:type="string">dee6e187-55bc-11d9-848a-00112f43529a</idgr>
                            <namegr xmlns:type="string">Мужские мокасины</namegr>
                        </category>
                        <category>
                            <idgr xmlns:type="string">dee6e18a-55bc-11d9-848a-00112f43529a</idgr>
                            <namegr xmlns:type="string">Мужские ботинки демисезонные</namegr>
                        </category>
                        <category>
                            <idgr xmlns:type="string">e8a71fab-55bc-11d9-848a-00112f43529a</idgr>
                            <namegr xmlns:type="string">Мужские сапоги с натуральным мехом</namegr>
                        </category>
                        <category>
                            <idgr xmlns:type="string">e8a71fad-55bc-11d9-848a-00112f43529a</idgr>
                            <namegr xmlns:type="string">Мужские туфли нубук</namegr>
                        </category>
                        <category>
                            <idgr xmlns:type="string">e8a71fb1-55bc-11d9-848a-00112f43529a</idgr>
                            <namegr xmlns:type="string">Мужские сапоги с искуственным мехом</namegr>
                        </category>
                        <category>
                            <idgr xmlns:type="string">e8a71fb5-55bc-11d9-848a-00112f43529a</idgr>
                            <namegr xmlns:type="string">Ботинки мужские</namegr>
                        </category>
                    </categories>
                </category>
                <category>
                    <idgr xmlns:type="string">dee6e1cf-55bc-11d9-848a-00112f43529a</idgr>
                    <namegr xmlns:type="string">Кроссовки</namegr>
                    <categories>
                        <category>
                            <idgr xmlns:type="string">dee6e1d0-55bc-11d9-848a-00112f43529a</idgr>
                            <namegr xmlns:type="string">Кроссовки "ADIDAS"</namegr>
                        </category>
                        <category>
                            <idgr xmlns:type="string">dee6e1d3-55bc-11d9-848a-00112f43529a</idgr>
                            <namegr xmlns:type="string">Кроссовки "REEBOK"</namegr>
                        </category>
                        <category>
                            <idgr xmlns:type="string">dee6e1d6-55bc-11d9-848a-00112f43529a</idgr>
                            <namegr xmlns:type="string">Кроссовки высокие нат. кожа</namegr>
                        </category>
                        <category>
                            <idgr xmlns:type="string">dee6e1d9-55bc-11d9-848a-00112f43529a</idgr>
                            <namegr xmlns:type="string">Кроссовки мужские, кожа</namegr>
                        </category>
                    </categories>
                </category>
                <category>
                    <idgr xmlns:type="string">05e26d88-01e4-11dc-a411-00055d80a2d1</idgr>
                    <namegr xmlns:type="string">Аксессуары</namegr>
                    <categories>
                        <category>
                            <idgr xmlns:type="string">05e26d89-01e4-11dc-a411-00055d80a2d1</idgr>
                            <namegr xmlns:type="string">Крем для обуви</namegr>
                        </category>
                        <category>
                            <idgr xmlns:type="string">05e26d8b-01e4-11dc-a411-00055d80a2d1</idgr>
                            <namegr xmlns:type="string">Щетка для обуви</namegr>
                        </category>
                    </categories>
                </category>
            </categories>
        </category>
</categories>
</export>

(Sorry for russian text in code) I tried to parse it （很抱歉代码中的俄语文本）我试图解析它 

public class ParseXmlData {
    public final static String FILE_PATH = "public/1cimport/export.xml";
    private DocumentBuilderFactory dbfactory;
    private DocumentBuilder documentBuilder;
    private Document doc;

    public final static String CATEGORIES_LABEL = "categories";

    private Integer levelCounter = 0;
    public ParseXmlData(){
        File xmlFile = new File(FILE_PATH);

        dbfactory = DocumentBuilderFactory.newInstance();
        try {
            documentBuilder = dbfactory.newDocumentBuilder();
            doc = documentBuilder.parse(FILE_PATH);
            final List<String> l  = new ArrayList<String>();

            parse(doc, l, doc.getDocumentElement());
        } catch (Exception e) {
            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
        }


    }
    public void parse(final Document doc, final List<String> list, final Element element){

        final NodeList nodeChildrenList = element.getChildNodes();

        for(int i = 0; i<nodeChildrenList.getLength(); i++){
            final Node node = nodeChildrenList.item(i);
            if(node.getNodeType() == Node.ELEMENT_NODE){
               list.add(node.getNodeName());
               if(node.getNodeName().toUpperCase().equals(ParseXmlData.CATEGORIES_LABEL.toUpperCase())){
                   CategoryParseXml categoryParseXml = new CategoryParseXml();
                   categoryParseXml.parseCategory(doc,list,(Element) node);
               }
               parse(doc,list,(Element) node);
            }
        }

    }
}

And another class 还有另一堂课 

public class CategoryParseXml {
    public static Integer levelCounter = 0;
    public final static String IDGR_LABEL = "IDGR";
    public final static String NAMEGR_LABEL = "NAMEGR";

    private List<CategoryEntity> categoryEntities = new ArrayList<CategoryEntity>();

    public void parseCategory(final Document doc, final List<String> list, final Element element){
        final NodeList nodeChildrenList = element.getChildNodes();

        CategoryEntity categoryEntity = new CategoryEntity();
        categoryEntity.setLevel(levelCounter);

        for(int i = 0; i<nodeChildrenList.getLength(); i++){
            final Node node = nodeChildrenList.item(i);
            if(node.getNodeType() == Node.ELEMENT_NODE){
                list.add(node.getNodeName());
                if(node.getNodeName().toUpperCase().equals(ParseXmlData.CATEGORIES_LABEL.toUpperCase())){
                    CategoryParseXml.levelCounter++;
                    parseCategory(doc,list,(Element) node);
                }
                if(node.getNodeName().toUpperCase().equals(CategoryParseXml.IDGR_LABEL.toUpperCase())){
                    categoryEntity.setCategoryId(node.getNodeValue());
                }
                if(node.getNodeName().toUpperCase().equals(CategoryParseXml.NAMEGR_LABEL.toUpperCase())){
                    categoryEntity.setName(node.getNodeValue());
                }

                parseCategory(doc,list,(Element) node);
            }
        }

    }

}

I use play framework and ebean as ORM support. 我使用play框架和ebean作为ORM支持。 So Entity looks like 所以实体看起来像 

@Entity
public class CategoryEntity extends Model {
    @Id
    private String categoryId;

    private String Name;
@OneToMany(targetEntity = CategoryEntity.class, cascade = CascadeType.ALL)
private List<CategoryEntity> categories;
    private Integer level;
}

I can't find moment when i need to get List of subcategories and when I need to create it and add to category. 我找不到何时需要获取子类别列表以及何时需要创建子类别并将其添加到类别的时刻。 Please provide me some ideas to fill this class entity from this xml 请提供一些想法，以从此xml填充此类实体

1 个解决方案

解决方案1
 0  2013-03-23 17:48:31

If I were you I would try a different approach: 如果我是你，我会尝试另一种方法：

  1. Create a XSD schema supporting recursion See this Recursion in an XML schema? 创建支持递归的XSD架构在XML架构中看到此递归吗？
  2. From that xsd schema use JAXB to create classes you can serialize to XML and de-serialize from XML See this too JAXB endless data structure, recursive binding? 从该xsd模式使用JAXB创建类，您可以将其序列化为XML并从XML反序列化。也可以看到JAXB这种无止境的数据结构，递归绑定吗？
  3. I would not recommend it but you can annotate that same JAXB generated classes as JPA entities and use them directly for persistence. 我不推荐这样做，但是您可以注释与JPA实体相同的JAXB生成的类，并将其直接用于持久性。 An alternative approach would be to create different separated classes for JPA entities and moving values between JPA and JAXB classes using reflection for instance 一种替代方法是为JPA实体创建不同的分离类，并使用例如反射在JPA和JAXB类之间移动值

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