Java解析XML文档给出了“prolog中不允许的内容”。错误

问题描述

我正在用Java编写一个程序，它使用一个自定义的XML文件并对其进行解析。我正在使用XML文件进行存储。我在Eclipse中收到以下错误。

  [致命错误]：1：1：prolog中不允许内容。 
 org.xml.sax.SAXParseException：prolog中不允许内容。 
在com.sun.org.apache.xerces.internal.parsers.DOMParser.parse（DOMParser.java:239）
在com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl。 parse（DocumentBuilderImpl.java:283）
在javax.xml.parsers.DocumentBuilder.parse（DocumentBuilder.java:208）
 at me.ericso.psusoc.RequirementSatisfier.parseXML（RequirementSatisfier.java:61） 
 at me.ericso.psusoc.RequirementSatisfier.getCourses（RequirementSatisfier.java:35）
 at me.ericso.psusoc.programs.RequirementSatisfierProgram.main（RequirementSatisfierProgram.java:23）
  

包含XML文件的开头：

 <？xml version =1.0？> 
< PSU> 
< Major id =IST> 
< name>信息科学与技术< / name> 
< degree> B.S.< / degree> 
< option>信息系统：设计和开发选项< / option> 
< requirements> 
< firstlevel type =General_Educationcredits =45> 
< component type =Writing_Speaking> GWS< / component> 
< component type =Quantification> GQ< / component> 
  

程序能够读取XML文件，但是当我调用 DocumentBuilder .parse（XMLFile）获得解析的 org.w3c.dom.Document ，我收到上面的错误。

在我看来，我的XML文件的序言中没有内容。我不知道是什么错了。请帮忙。谢谢。

解决方案

请检查xml文件是否有这样的垃圾字符 。如果存在，请使用以下语法删除它。

  String XString = writer.toString（）; 
 XString = XString.replaceAll（[^ \\ x20-\\\x7e]，）; 
  

I am writing a program in Java that takes a custom XML file and parses it. I'm using the XML file for storage. I am getting the following error in Eclipse.

[Fatal Error] :1:1: Content is not allowed in prolog.
org.xml.sax.SAXParseException: Content is not allowed in prolog.
    at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:239)
    at     com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:283  )
    at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:208)
    at me.ericso.psusoc.RequirementSatisfier.parseXML(RequirementSatisfier.java:61)
    at me.ericso.psusoc.RequirementSatisfier.getCourses(RequirementSatisfier.java:35)
    at     me.ericso.psusoc.programs.RequirementSatisfierProgram.main(RequirementSatisfierProgram.java:23  )

The beginning of the XML file is included:

<?xml version="1.0" ?>
<PSU>
     <Major id="IST">
        <name>Information Science and Technology</name>
        <degree>B.S.</degree>
        <option> Information Systems: Design and Development Option</option>
        <requirements>
            <firstlevel type="General_Education" credits="45">
                <component type="Writing_Speaking">GWS</component>
                <component type="Quantification">GQ</component>

The program is able to read in the XML file but when I call DocumentBuilder.parse(XMLFile) to get a parsed org.w3c.dom.Document, I get the error above.

It doesn't seem to me that I have invalid content in the prolog of my XML file. I can't figure out what is wrong. Please help. Thanks.

解决方案

Please check the xml file whether it has any junk character like this �.If exists,please use the following syntax to remove that.

String XString = writer.toString();
XString = XString.replaceAll("[^\\x20-\\x7e]", "");

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