java - 如何使用 Java 和 XmlSchema Core 解析 XSD 并读取所有复杂元素及其子元素
问题描述
我正在使用该Apache XmlSchema Core
库来解析XSD
文件并获取所有元素及其子类型(数据类型、maxOccurs 等)。我正在关注文档Apache XML SCHEMA CORE并尝试这样做。但是在导航到某个点后,我有点困惑。有人可以指导我如何遍历我的XSD
文件并获取所有元素及其子元素以及相关信息吗?
我能够在我的schema
元素中获取所有 XSD 信息我只想知道如何从我的根访问子元素RootFood
并获取其相关信息。任何帮助将非常感激。
我试图进一步继续,这就是我到目前为止所拥有的:元素RootFood
属于 class 的实例XmlSchemaGroupParticle
。我尝试调试代码以查找与我关联的元素rootParticles
,它具有调用的字段items
,其中我有我的food
元素items->[0]->namedDelegate->qName->localPart
,但是当我尝试添加GET
方法rootParticles
以获取items
然后没有这样的方法。
XmlSchemaParticle
扩展了以下类:,XmlSchemaAnnotated
,XmlSchemaObject
并实现了接口XmlSchemaObjectBase
,但它们都没有名为 的字段Items
。
以下是我到目前为止的Java代码,我尝试了几件事:
public class XMLSchemaCore {
public static void main(String[] args) throws URISyntaxException,
FileNotFoundException,
UnsupportedEncodingException {
String xsdPath = Paths.get(XMLSchemaCore.class.getClassLoader().getResource("test.xsd").toURI()).toFile().getAbsolutePath();
String filePath = Path.of(xsdPath).toString();
InputStream is = new FileInputStream(filePath);
XmlSchemaCollection schemaCol = new XmlSchemaCollection();
// Schema contain the complete XSD content which needs to be parsed
XmlSchema schema = schemaCol.read(new StreamSource(is));
// schema.write(System.out);
for (Map.Entry<QName, XmlSchemaElement> entry: schema.getElements().entrySet()) {
// Root element and its contents
QName parentElementName = entry.getKey();
XmlSchemaElement parentElementValues = entry.getValue();
// Get the elements based on the Root element
XmlSchemaElement root = schema.getElementByName(parentElementName);
// Get the type of the root element
XmlSchemaType type = root != null ? root.getSchemaType() : null;
// Check if the root element is of Complex type
if (type instanceof XmlSchemaComplexType) {
// Get the Particles associated with the element
XmlSchemaParticle rootParticles = ((XmlSchemaComplexType) type).getParticle();
// Check particle belongs to which type
if (rootParticles instanceof XmlSchemaAny) {
System.out.println("Any Schema Type");
} else if (rootParticles instanceof XmlSchemaElement) {
System.out.println("Element Schema Type");
} else if (rootParticles instanceof XmlSchemaGroupParticle) {
System.out.println("Group Schema Type");
System.out.println(rootParticles);
System.out.println(rootParticles);
} else if (rootParticles instanceof XmlSchemaGroupRef) {
System.out.println("Group Ref Schema Type");
}
}
}
}
}
以下是XSD
我拥有的文件:
<xs:schema attributeFormDefault="unqualified"
elementFormDefault="qualified"
xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="RootFood">
<xs:complexType>
<xs:sequence>
<xs:element name="food">
<xs:complexType>
<xs:sequence>
<xs:element type="xs:string" name="name" />
<xs:element type="xs:string" name="price" />
<xs:element type="xs:string" name="description" />
<xs:element type="xs:short" name="calories" />
<xs:element name="ingredients">
<xs:complexType>
<xs:sequence>
<xs:element type="xs:string" name="ingredient"
maxOccurs="unbounded" minOccurs="0" />
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
解决方案
在尝试了很多事情之后,我能够让代码正常工作。在此处发布代码,因为它可能对计划使用Apache XMLSchema Core Library 进行 XML/XSD 解析的人有所帮助。我知道这是多么令人沮丧,因为我们在互联网上没有这个解析库的一些好的例子。希望这可以帮助。
基本上,此代码将解析整个XSD
文件并HashMap
根据其父元素和子元素将元素存储在其中。您可以获取任何 XSD 元素的父级,也可以获取与子级相关的信息,例如其父级等。检查XmlSchemaElement以获取有关每个子级信息的更多详细信息:
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.URISyntaxException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import javax.xml.namespace.QName;
import javax.xml.transform.stream.StreamSource;
import org.apache.ws.commons.schema.XmlSchema;
import org.apache.ws.commons.schema.XmlSchemaAny;
import org.apache.ws.commons.schema.XmlSchemaCollection;
import org.apache.ws.commons.schema.XmlSchemaComplexType;
import org.apache.ws.commons.schema.XmlSchemaElement;
import org.apache.ws.commons.schema.XmlSchemaGroupRef;
import org.apache.ws.commons.schema.XmlSchemaParticle;
import org.apache.ws.commons.schema.XmlSchemaSequence;
import org.apache.ws.commons.schema.XmlSchemaSequenceMember;
import org.apache.ws.commons.schema.XmlSchemaType;
public class XMLSchemaCore {
private static XmlSchemaCollection xmlSchemaCollection;
private static Map<QName, List<XmlSchemaElement>> xsdElements = new HashMap<QName, List<XmlSchemaElement>>();
private static List<XmlSchemaElement> schemaElements = new ArrayList<XmlSchemaElement>();
public static void main(String[] args) throws URISyntaxException, FileNotFoundException, UnsupportedEncodingException {
// Path for the file which is stored within the Resource folder
String xsdPath = Paths.get(XMLSchemaCore.class.getClassLoader().getResource("test.xsd").toURI()).toFile().getAbsolutePath();
String filePath = Path.of(xsdPath).toString();
InputStream is = new FileInputStream(filePath);
xmlSchemaCollection = new XmlSchemaCollection();
// Schema contain the complete XSD content which needs to be parsed
XmlSchema schema = xmlSchemaCollection.read(new StreamSource(is));
// schema.write(System.out);
// Get the root element from XSD
Map.Entry<QName, XmlSchemaElement> entry = schema.getElements().entrySet().iterator().next();
QName rootElement = entry.getKey();
// Get all the elements based on the parent element
XmlSchemaElement childElement = xmlSchemaCollection.getElementByQName(rootElement);
// Call method to get all the child elements
getChildElementNames(childElement);
String element = "" + xsdElements.entrySet().stream().map(e -> e.getKey() + " -- " + String.join(", ", e.getValue().stream().map(v -> v
.getQName().toString()).collect(Collectors.toList()))).collect(Collectors.toList());
System.out.println(element);
}
// Method to check for the child elements and return list
private static void getChildElementNames(XmlSchemaElement element) {
// Get the type of the element
XmlSchemaType elementType = element != null ? element.getSchemaType() : null;
// Confirm if the element is of Complex type
if (elementType instanceof XmlSchemaComplexType) {
// Get all particles associated with that element Type
XmlSchemaParticle allParticles = ((XmlSchemaComplexType) elementType).getParticle();
// Check particle belongs to which type
if (allParticles instanceof XmlSchemaAny) {
System.out.println("Any Schema Type");
} else if (allParticles instanceof XmlSchemaElement) {
System.out.println("Element Schema Type");
} else if (allParticles instanceof XmlSchemaSequence) {
// System.out.println("Sequence Schema Type");
final XmlSchemaSequence xmlSchemaSequence = (XmlSchemaSequence) allParticles;
final List<XmlSchemaSequenceMember> items = xmlSchemaSequence.getItems();
items.forEach((item) -> {
XmlSchemaElement itemElements = (XmlSchemaElement) item;
schemaElements.add(itemElements);
// System.out.println(" Parent : " + element.getQName() + " -- Child : " +
// itemElements.getQName());
//Call the method to add the current element as child
addChild(element.getQName(), itemElements);
// Call method recursively to get all subsequent element
getChildElementNames(itemElements);
schemaElements = new ArrayList<XmlSchemaElement>();
});
} else if (allParticles instanceof XmlSchemaGroupRef) {
}
}
}
// Add child elements based on its parent
public static void addChild(QName qName, XmlSchemaElement child) {
List<XmlSchemaElement> values = xsdElements.get(qName);
if (values == null) {
values = new ArrayList<XmlSchemaElement>();
}
values.add(child);
xsdElements.put(qName, values);
}
}
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