Java 解析 XML 文档给出“Prolog 中不允许的内容".错误 [英] Java parsing XML document gives "Content not allowed in prolog." error

问题描述

我正在用 Java 编写一个程序，它接受一个自定义 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.

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  )

包含 XML 文件的开头:

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>

程序能够读取 XML 文件，但是当我调用 DocumentBuilder.parse(XMLFile) 来获取已解析的 org.w3c.dom.Document 时，我得到上面的错误.

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.

在我看来，我的 XML 文件的序言中没有无效内容.我不知道出了什么问题.请帮忙.谢谢.

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.

推荐答案

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.

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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