prolog问题中不允许使用内容

Question

这是我签署XML的代码

public String signXML(String xmlDocument, boolean includeKeyInfo) {
    Security.addProvider(new BouncyCastleProvider());
    try {
        // Parse the input XML
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        dbf.setNamespaceAware(true);
        Document inputDocument = dbf.newDocumentBuilder().parse(new InputSource(new StringReader(xmlDocument)));

        // Sign the input XML's DOM document
        Document signedDocument = sign(inputDocument, includeKeyInfo);

        // Convert the signedDocument to XML String
        StringWriter stringWriter = new StringWriter();
        TransformerFactory tf = TransformerFactory.newInstance();
        Transformer trans = tf.newTransformer();
        trans.transform(new DOMSource(signedDocument), new StreamResult(stringWriter));

        return stringWriter.getBuffer().toString();
    } catch (Exception e) {
        e.printStackTrace();
        throw new RuntimeException("Error while digitally signing the XML document", e);
    }
}

我在这里使用

public static void main(String [] ags)
{
    //SignGenerator signgenerator=new SignGenerator();
    //signgenerator.generateXMLDigitalSignature("C:\\Users\\admin\\workspace\\Esign_Request\\Esign.xml", "C:\\Users\\admin\\workspace\\Esign_Request\\jaxb-emp.xml", "C:\\Users\\admin\\Downloads\\simple.p12", "C:\\Users\\admin\\Downloads\\uidai_auth_prod.cer");
    char[] a={'p','u','b','l','i','c'};
    DigitalSigner ds=new DigitalSigner("C:\\Users\\admin\\Downloads\\simple.p12",a,"public");
    String s=ds.signXML("C:\\Users\\admin\\workspace\\Esign_Request\\Esign.xml",true);
    System.out.println(s);
}

但显示错误

Fatal Error] :1:1: Content is not allowed in prolog.

org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 1; Content is not allowed in prolog.
    at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(Unknown Source)

显示错误

Document inputDocument = dbf.newDocumentBuilder().parse(new InputSource(new StringReader(xmlDocument)));

我已经阅读了有关此主题的所有答案，他们都指向<?xml >标记前面有一些内容但是......我传递的XML是以<?xml标记开头的。没有空格 那么，为什么会出现错误？

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Esign ts="2016-06-09T16:44:44" txn="78e65b0e-a20c-4fe2-b3cc-746a8e0c4670"  esignClass="1" aspId="KNTR-900" gatewayPin="" preferredCa="" sc="Y" ver="1.0">
    <Input>658c26712e1d4591253833407dc2cd81b8b686370d38b4c65c2ea6bdf54e5dd4</Input>
    <Aadhaar>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</Aadhaar>
</Esign>

Answer 1

一种可能性是文件开头有一个BOM，尝试使用一些高级编辑器来检查当前编码并将xml保存为UTF-8而不用BOM。

使用Sublime Text，在文件菜单中，使用save with encoding并选择＆＃34; UTF-8＆＃34;：

这应该删除您的BOM

Answer 2

我做了一些改动，现在正在努力。但仍然没有找到为什么它在以前的版本中显示错误。

之前的版本 - ：

   Document inputDocument = dbf.newDocumentBuilder().parse(new InputSource(new StringReader(xmlDocument)));

新版本 - ：

   Document inputDocument = dbf.newDocumentBuilder().parse(new InputSource(new File(XmlDocument));

我将StringReader（xmlDocument）更改为File（XmlDocument）