將字符串轉換爲XML文檔時出現致命錯誤

我有XML形式的字符串數據，我想將其轉換爲XML文檔以便在其中創建一些過程，並且使用以下方法做的是：將字符串轉換爲XML文檔時出現致命錯誤

private Document convert(String xml) throws ParserConfigurationException, 
      SAXException, IOException { 

     // convert String into InputStream 
     InputStream is = new ByteArrayInputStream(xml.getBytes()); 

     // convert InputStream to Document 
     domFactory = DocumentBuilderFactory.newInstance(); 
     domFactory.setNamespaceAware(true); 
     builder = domFactory.newDocumentBuilder(); 
     builder(builder); // this is the error handler method i'm using 
     Document doc = builder.parse(is); 
     is.close(); 

     return doc; 
    }

奇怪的是，處理正確完成，每一件事情是完美的與我的結果，但在另一邊，當我使轉換過程中，我在我的控制檯得到一個信息：

[Fatal Error] :1:1: Premature end of file.

所以，我已經使用了一個錯誤處理程序爲了趕上致命的錯誤，並打印異常堆棧跟蹤，然後我得到了這些異常拋出：

org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 1; Premature end of file. 
    at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source) 
    at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(Unknown Source) 
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source) 
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source) 
    at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(Unknown Source) 
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(Unknown Source) 
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source) 
    at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(Unknown Source) 
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source) 
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) 
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) 
    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source) 
    at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(Unknown Source) 
    at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(Unknown Source) 
    at javax.xml.parsers.DocumentBuilder.parse(Unknown Source) 
    at com.nc.inotify.dp.xml.impl.XmlSource.convert(XmlSource.java:327) 
    at com.nc.inotify.dp.xml.impl.XmlSource.update(XmlSource.java:299) 
    at com.nc.inotify.dp.xml.junit.TXmlSource.testUpdate(TXmlSource.java:106) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
    at java.lang.reflect.Method.invoke(Unknown Source) 
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45) 
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) 
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42) 
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20) 
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263) 
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68) 
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47) 
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231) 
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60) 
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229) 
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50) 
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222) 
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28) 
    at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:30) 
    at org.junit.runners.ParentRunner.run(ParentRunner.java:300) 
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) 
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

UPDATE： XML文件：

<?xml version="1.0" encoding="UTF-8" standalone="no"?> 
<rss xmlns:geo="http://www.w3.org/2003/01/geo/wgs84_pos#" xmlns:yweather="http://xml.weather.yahoo.com/ns/rss/1.0" version="2.0"> 
      <channel> 

<title>Yahoo! Weather - Sunnyvale, CA</title> 
<link>http://us.rd.yahoo.com/dailynews/rss/weather/Sunnyvale__CA/*http://weather.yahoo.com/forecast/USCA1116_f.html</link> 
<description>Yahoo! Weather for Sunnyvale, CA</description> 
<language>en-us</language> 
<lastBuildDate>Thu, 06 Jun 2013 1:56 am PDT</lastBuildDate> 
<ttl>60</ttl> 
<yweather:location city="Sunnyvale" country="United States" region="CA"/> 
<yweather:units distance="mi" pressure="in" speed="mph" temperature="F"/> 
<yweather:wind chill="58" direction="30" speed="3"/> 
<yweather:atmosphere humidity="81" pressure="29.96" rising="2" visibility="10"/> 
<yweather:astronomy sunrise="5:46 am" sunset="8:25 pm"/> 
<image> 
<title>Yahoo! Weather</title> 
<width>142</width> 
<height>18</height> 
<link>http://weather.yahoo.com</link> 
<url>http://l.yimg.com/a/i/brand/purplelogo//uh/us/news-wea.gif</url> 
</image> 
<item> 
<title>Conditions for Sunnyvale, CA at 1:56 am PDT</title> 
<geo:lat>37.37</geo:lat> 
<geo:long>-122.04</geo:long> 
<link>http://us.rd.yahoo.com/dailynews/rss/weather/Sunnyvale__CA/*http://weather.yahoo.com/forecast/USCA1116_f.html</link> 
<pubDate>Thu, 06 Jun 2013 1:56 am PDT</pubDate> 
<yweather:condition code="26" date="Thu, 06 Jun 2013 1:56 am PDT" temp="58" text="Cloudy"/> 
<description><![CDATA[ 
<img src="http://l.yimg.com/a/i/us/we/52/26.gif"/><br /> 
<b>Current Conditions:</b><br /> 
Cloudy, 58 F<BR /> 
<BR /><b>Forecast:</b><BR /> 
Wed - Partly Cloudy. High: 70 Low: 55<br /> 
Thu - AM Clouds/PM Sun. High: 74 Low: 57<br /> 
Fri - Partly Cloudy. High: 81 Low: 62<br /> 
Sat - Sunny. High: 78 Low: 63<br /> 
Sun - Partly Cloudy. High: 72 Low: 60<br /> 
<br /> 
<a href="http://us.rd.yahoo.com/dailynews/rss/weather/Sunnyvale__CA/*http://weather.yahoo.com/forecast/USCA1116_f.html">Full Forecast at Yahoo! Weather</a><BR/><BR/> 
(provided by <a href="http://www.weather.com" >The Weather Channel</a>)<br/> 
]]></description> 
<yweather:forecast code="29" date="5 Jun 2013" day="Wed" high="70" low="55" text="Partly Cloudy"/> 
<yweather:forecast code="30" date="6 Jun 2013" day="Thu" high="74" low="57" text="AM Clouds/PM Sun"/> 
<yweather:forecast code="30" date="7 Jun 2013" day="Fri" high="81" low="62" text="Partly Cloudy"/> 
<yweather:forecast code="32" date="8 Jun 2013" day="Sat" high="78" low="63" text="Sunny"/> 
<yweather:forecast code="30" date="9 Jun 2013" day="Sun" high="72" low="60" text="Partly Cloudy"/> 
<guid isPermaLink="false">USCA1116_2013_06_09_7_00_PDT</guid> 
</item> 
</channel> 
</rss><!-- api10.weather.ch1.yahoo.com Thu Jun 6 09:34:11 PST 2013 -->

來源

2013-06-06 Muhammed Refaat

你確定，你的'xml'變量是否包含安全的xml？ – Andremoniy

也許你的xml文件已損壞。看看它，並確保每個標籤都有其相應的結束標籤。 –

您需要共享xml字符串以尋求適當的幫助 –

如何使這個私有方法，可測試通過創建一個單獨的類？讓我們開始測試：

import static org.hamcrest.CoreMatchers.is; 
import static org.junit.Assert.*; 

import org.junit.Test; 
import org.w3c.dom.Document; 
import org.w3c.dom.Element; 

public class StringToDOMConverterTest { 

private StringToDOMConverter stringToDOMConverter = new StringToDOMConverter(); 

@Test 
public void converterShouldConvertSimpleDocument() throws Exception { 
    final Document dom = stringToDOMConverter.convert("<mail><to>Alice</to><from>Jum</from><heading>Invitation</heading><body>Let's get some icecream!</body></mail>"); 
    final Element documentRoot = dom.getDocumentElement(); 
    assertThat(documentRoot.getNodeName(), is("mail")); 
} 
}

現在你的方法的修改版本（建設者聲明並未編譯）：

import java.io.ByteArrayInputStream; 
import java.io.IOException; 
import java.io.InputStream; 

import javax.xml.parsers.DocumentBuilder; 
import javax.xml.parsers.DocumentBuilderFactory; 
import javax.xml.parsers.ParserConfigurationException; 

import org.w3c.dom.Document; 
import org.xml.sax.SAXException; 

public class StringToDOMConverter { 

private final DocumentBuilderFactory domFactory; 
private DocumentBuilder builder; 

public StringToDOMConverter() { 
    domFactory = DocumentBuilderFactory.newInstance(); 
    domFactory.setNamespaceAware(false); 
} 

public Document convert(final String xml) throws ParserConfigurationException, SAXException, IOException { 

    final InputStream is = new ByteArrayInputStream(xml.getBytes()); 
    Document document = null; 
    try { 
     builder = domFactory.newDocumentBuilder(); 
     // builder(builder); // this is the error handler method i'm using 
     document = builder.parse(is); 
    } finally { 
     if(is != null) is.close(); 
    } 
    return document; 
} 
}

這是一個基礎，你可以嘗試所有的標誌和錯誤處理東西。不要忘記需要檢查前提條件並適當地處理錯誤（併爲此寫入測試:-)）。

來源

2013-06-06 09:41:36

測試通過正確，我看到你寫的代碼沒有核心變化，那麼，我的錯誤在哪裏？ –

嘗試添加我遺漏的語句，測試將向您展示！ –

你的xml不是一個格式良好的xml。如果你在瀏覽器中打開它，你可以看到它沒有正確打開。您可以使用XML驗證可在驗證XML：

http://www.w3schools.com/xml/xml_validator.asp

修復你的XML，你應該是不錯的。

來源

2013-06-06 09:50:06

將字符串轉換爲XML文檔時出現致命錯誤

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