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為什么 STAX 解析器認為這是有效的 XML 1.0 而不是

Why does the STAX parser think this is valid XML 1.0 but not 1.1?(為什么 STAX 解析器認為這是有效的 XML 1.0 而不是 1.1?)
本文介紹了為什么 STAX 解析器認為這是有效的 XML 1.0 而不是 1.1?的處理方法,對大家解決問題具有一定的參考價值,需要的朋友們下面隨著小編來一起學習吧!

問題描述

在下面的代碼示例中,我使用 STaX 解析器來解析一段 XML.如果我通過它運行 xml10,它會按預期工作.xml11 字符串(相同,除了 xml 版本) - 它拋出 NullPointerException.我在使用 JDK 1.6 的 Mac 上運行它.

In the following code example, I use the STaX parser to parse a piece of XML. If I run the xml10 through it, it works as expected. The xml11 string (which is the same, except for the xml version) - it throws a NullPointerException. I'm running this on a Mac using JDK 1.6.

import javax.xml.namespace.QName;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamReader;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.StringReader;
import java.util.Stack;

/**
 */
public class StaxSucks {

    static String xml10 ="<?xml version="1.0" encoding="utf-8" ?>
"+
                        "<anElement/>";

    static String xml11 ="<?xml version="1.1" encoding="utf-8" ?>
"+
            "<anElement/>";


    static void parse(InputStream is) throws Exception{
        final XMLInputFactory factory = XMLInputFactory.newInstance();
        factory.setProperty(XMLInputFactory.IS_SUPPORTING_EXTERNAL_ENTITIES, Boolean.FALSE);
        final XMLStreamReader xmlStreamReader = factory.createXMLStreamReader(is);
        Stack<QName> XMLDEPTH = new Stack<QName>();
        int eventType = xmlStreamReader.next();
        while(eventType != XMLStreamConstants.END_DOCUMENT){
            if(XMLStreamConstants.START_ELEMENT == eventType){
                QName eventName = xmlStreamReader.getName();
                XMLDEPTH.push(eventName);
            }else if(XMLStreamConstants.END_ELEMENT == eventType){
                //ends should always match the starts.
                QName eventName = xmlStreamReader.getName();
                if(XMLDEPTH.peek().equals(eventName)){
                    XMLDEPTH.pop();
                }else{
                    System.out.println("Hit an end with a non-matching beginning:"+eventName);
                }
            } else{
                System.out.println("Hit event type:"+eventType);
            }
            eventType = xmlStreamReader.next();
        }
        System.out.println("Stack is empty:"+XMLDEPTH.empty());

    }

    public static void main(String[] args) throws Exception{
        System.out.println("Starting XML1.0");
        InputStream is = new ByteArrayInputStream(xml10.getBytes("utf8"));
        parse(is);
        System.out.println("Starting XML1.1");
        is = new ByteArrayInputStream(xml11.getBytes("utf8"));
        parse(is);
    }
}

堆棧跟蹤:

Exception in thread "main" java.lang.NullPointerException
    at com.sun.org.apache.xerces.internal.impl.XML11NSDocumentScannerImpl.scanStartElement(XML11NSDocumentScannerImpl.java:351)
    at com.sun.org.apache.xerces.internal.impl.XML11NSDocumentScannerImpl$NS11ContentDriver.scanRootElementHook(XML11NSDocumentScannerImpl.java:889)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:3104)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:922)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648)
    at com.sun.org.apache.xerces.internal.impl.XML11NSDocumentScannerImpl.next(XML11NSDocumentScannerImpl.java:852)
    at com.sun.org.apache.xerces.internal.impl.XMLStreamReaderImpl.next(XMLStreamReaderImpl.java:554)
    at StaxSucks.parse(StaxSucks.java:46)
    at StaxSucks.main(StaxSucks.java:74)

推薦答案

您好 這是 Sun/Oracle JDK 中 stax 實現損壞的案例,IBM JDK 工作正常,或者您甚至可以只使用最新的 Xerces jars會沒事的.

Hi This is a case of broken stax implementation in the Sun/Oracle JDK, IBM JDK works fine, or you can even just use the latest Xerces jars and you will be fine.

您可以從以下位置下載 xerces jar:http://xerces.apache.org/mirrors.cgi#binary

You can download xerces jars from: http://xerces.apache.org/mirrors.cgi#binary

dims@dims-laptop-520:~/test$ /usr/lib/jvm/java-6-sun/bin/java -cp . StaxSucks
Starting XML1.0
Stack is empty:true
Starting XML1.1
Exception in thread "main" java.lang.NullPointerException
    at com.sun.org.apache.xerces.internal.impl.XML11NSDocumentScannerImpl.scanStartElement(XML11NSDocumentScannerImpl.java:351)
    at com.sun.org.apache.xerces.internal.impl.XML11NSDocumentScannerImpl$NS11ContentDriver.scanRootElementHook(XML11NSDocumentScannerImpl.java:889)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:3104)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:922)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648)
    at com.sun.org.apache.xerces.internal.impl.XML11NSDocumentScannerImpl.next(XML11NSDocumentScannerImpl.java:852)
    at com.sun.org.apache.xerces.internal.impl.XMLStreamReaderImpl.next(XMLStreamReaderImpl.java:554)
    at StaxSucks.parse(StaxSucks.java:26)
    at StaxSucks.main(StaxSucks.java:54)
dims@dims-laptop-520:~/test$ java -cp .:xercesImpl.jar:xml-apis.jar StaxSucks
Starting XML1.0
Stack is empty:true
Starting XML1.1
Stack is empty:true

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