Question

我有从XSD生成的XmlBeans类。我想跟踪持久对象的行号。这可能吗？我不关心在解析（xml→beans）期间或者在prettyprinting（beans→xml）期间是否存储了这些信息，因为我在应用程序流程中保持它们同步。

如果可能的话，我想要开始和结束行/列号。

我不在乎是否必须使用某种非标准黑客来获取定位器数据。

如果有另一个Java XML框架可以从XSD文件生成类和支持定位器数据，那么我愿意切换。

Answer 1

注意：我是EclipseLink JAXB (MOXy)主管，是JAXB (JSR-222)专家组的成员。

如果有另一个可以从中生成类的Java XML框架一个XSD文件和支持定位器数据，然后我愿意切换。

JAXB可以从XML模式生成类，下面有两种方法可以获取位置信息。有关JAXB和XMLBeans的比较，请参阅：

http://blog.bdoughan.com/2012/01/how-does-jaxb-compare-to-xmlbeans.html

选项＃1 - StAX和Unmarshaller.Listener

的演示 的

package forum10241929; import java.io.File; import javax.xml.bind.*; import javax.xml.stream.*; import javax.xml.transform.stream.StreamSource; public class Demo { public static void main(String[] args) throws Exception { JAXBContext jc = JAXBContext.newInstance(Customer.class); XMLInputFactory xif = XMLInputFactory.newFactory(); XMLStreamReader xsr = xif.createXMLStreamReader(new StreamSource(new File("src/forum10241929/input.xml"))); Unmarshaller unmarshaller = jc.createUnmarshaller(); unmarshaller.setListener(new LocationListener(xsr)); Customer customer = (Customer) unmarshaller.unmarshal(xsr); } private static class LocationListener extends Unmarshaller.Listener { private XMLStreamReader xsr; public LocationListener(XMLStreamReader xsr) { this.xsr = xsr; } @Override public void afterUnmarshal(Object target, Object parent) { log("End", target); } @Override public void beforeUnmarshal(Object target, Object parent) { log("Start", target); } private void log(String event, Object target) { System.out.print(event); System.out.print(" "); System.out.print(target); System.out.print(" ["); Location location = xsr.getLocation(); System.out.print(location.getLineNumber()); System.out.print(","); System.out.print(location.getColumnNumber()); System.out.println("]"); } } }

的 input.xml中 的

<?xml version="1.0" encoding="UTF-8"?> <customer> <name>Jane Doe</name> <address> <street>1 A Street</street> </address> </customer>

的输出 的

Start forum10241929.Customer@144aa0ce [2,11] Start forum10241929.Address@19e3cd51 [4,14] End forum10241929.Address@19e3cd51 [6,15] End forum10241929.Customer@144aa0ce [7,12]

<强>客户 的

package forum10241929; import javax.xml.bind.annotation.XmlRootElement; @XmlRootElement public class Customer { private String name; private Address address; public String getName() { return name; } public void setName(String name) { this.name = name; } public Address getAddress() { return address; } public void setAddress(Address address) { this.address = address; } }

的地址 的

package forum10241929; public class Address { private String street; public String getStreet() { return street; } public void setStreet(String street) { this.street = street; } }

选项＃2 - @XmlLocation

EclipseLink JAXB（MOXy）和名为@XmlLocation的引用实现都支持JAXB扩展（下面是使用MOXy的示例）。这只会捕获起始位置。

package forum10241929; import javax.xml.bind.annotation.XmlRootElement; import org.eclipse.persistence.oxm.annotations.XmlLocation; import org.xml.sax.Locator; @XmlRootElement public class Customer { private String name; private Address address; @XmlLocation private Locator location; public String getName() { return name; } public void setName(String name) { this.name = name; } public Address getAddress() { return address; } public void setAddress(Address address) { this.address = address; } }

Answer 2

只需使用XmlOptions#setLoadLineNumbers()，例如：

MyDocument.Factory.parse(xmlFile, new XmlOptions().setLoadLineNubmers());

然后从xml商店中检索行号，找到最近的XmlLineNumber书签。

import org.apache.xmlbeans.*;

public class linenumber
{
    public static void main(String[] args) throws XmlException
    {
        XmlOptions options = new XmlOptions().setLoadLineNumbers();
        XmlObject xobj = XmlObject.Factory.parse("<a>\n<b>test</b>\n<c>test</c>\n</a>", options);

        // let's get the line number for the '<c>' xml object
        XmlObject cobj = xobj.selectPath(".//c")[0];
        System.out.println(cobj.xmlText());

        XmlCursor c = null;
        try
        {
            c = cobj.newCursor();

            // search for XmlLineNumber bookmark
            XmlLineNumber ln =
                (XmlLineNumber) c.getBookmark( XmlLineNumber.class );

            if (ln == null)
                ln = (XmlLineNumber) c.toPrevBookmark( XmlLineNumber.class );

            if (ln != null)
            {
                int line = ln.getLine();
                int column = ln.getColumn();
                int offset = ln.getOffset();

                System.out.println("line=" + line + ", col=" + column + ", offset=" + offset);
            }
        }
        finally
        {
            if (c != null) c.dispose();
        }
    }
}

读/写期间的XmlBeans源定位器

2 个答案: