类似于这个问题,但不幸的是没有帮助
我正在尝试在 Java 中将字符串解析为 XML,但不断收到错误:
[Fatal Error] output.txt:1:1: Content is not allowed in prolog.
我知道这一定与我的XML字符串有关,因为我用非常基本的XML运行了一个测试,错误消失了。
.XML
<?xml version="1.0" encoding="UTF-8"?>
<?xfa generator="ff99v250_01" APIVersion="1.4.3139.0"?>
<jfxpf:XPF xmlns:jfxpf="http://www.xfa.com/schema/xml-package">
<jfxpf:Package>
<jfxpf:Resource Location="GenReq">
<jfxpf:Link ContentType="application/x-jetform-cft" />
</jfxpf:Resource>
<jfxpf:Resource Location="default.xml">
<jfxpf:Content ContentType="text/xml" Location="default.xml">
<xfa:Data xmlns:xfa="http://www.xfa.org/schema/xfa-data/1.0/">
<xfa:DataGroup>
<data xmlns:xfe="http://www.xfa.org/schema/xfa-events/1.0" xfe:script="$config.proto.common.template.uri='GenReq'" xfe:event="$config:load">
<?jetform ^Dat ^page 1?>
<FR_NAME>Administrator</FR_NAME>
<JFWF_DELEGATE />
<ADHOC_DLN_ACTOR />
<ADHOC_DLN_MSG />
<ADHOC_DLN_TIME />
<ADHOC_DLN_UNITS>Days</ADHOC_DLN_UNITS>
<ADHOC_RMD_MSG />
<ADHOC_RMD_TIME />
<ADHOC_RMD_UNITS>Days</ADHOC_RMD_UNITS>
<ADHOC_RPT_TIME />
<ADHOC_RPT_UNITS>Days</ADHOC_RPT_UNITS>
<CIRCULATETO />
<COMPLETION />
<FOLLOWUP />
<MSGSUBJECT />
<OTHERFIELD />
<PRIORITY>Low</PRIORITY>
<REQUEST />
<RESPONSE />
<Submit />
<ADHOC_VALIDDATA>True</ADHOC_VALIDDATA>
<JFWF_TRANID>2xxyg9sffane7pwd5j8yv9t49s.1</JFWF_TRANID>
<JFWF_INSTRUCTION>Initiate a General Request. Fill the request form, then identify the next participant.</JFWF_INSTRUCTION>
<JFWF_TRANSPORT>HTTP</JFWF_TRANSPORT>
<JFWF_STATUS>RECEIVED</JFWF_STATUS>
<JFWF_ACTION />
<JFWF_CHOICE>*Select Next Participant,Cancel</JFWF_CHOICE>
<JFWF_VERSION>6.2</JFWF_VERSION>
<JFWF_READONLY>1</JFWF_READONLY>
</data>
</xfa:DataGroup>
</xfa:Data>
</jfxpf:Content>
</jfxpf:Resource>
</jfxpf:Package>
</jfxpf:XPF>
但是,我无法找到导致此问题的文本。我的 Java 代码如下:
Document doc = DocumentBuilderFactory.newInstance().newDocumentBuilder()
.parse(new InputSource(new StringReader(xml)));
编辑删除Data
节点有效,因此错误位于 XML 的深层位置。这不会引发错误:
<?xml version="1.0" encoding="UTF-8"?>
<?xfa generator="ff99v250_01" APIVersion="1.4.3139.0"?>
<jfxpf:XPF xmlns:jfxpf="http://www.xfa.com/schema/xml-package">
<jfxpf:Package>
<jfxpf:Resource Location="GenReq">
<jfxpf:Link ContentType="application/x-jetform-cft"/>
</jfxpf:Resource>
<jfxpf:Resource Location="default.xml">
<jfxpf:Content ContentType="text/xml" Location="default.xml">
</jfxpf:Content>
</jfxpf:Resource>
</jfxpf:Package>
</jfxpf:XPF>
我的进口
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import javax.swing.JFileChooser;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
我的猜测是该文件以 BOM 字符 U+FEFF 开头:第 1 行第 1 列的错误。这是一个零宽度空格,有时用于将文件标记为某些 Unicode 表示形式,UTF-8、UTF-16LE、UTF-16BE。
可以删除 BOM 字符。检查文件大小,然后查看您有哪些选项:另存为 UTF-8 而不带 BOM,删除。
在 java 中(如果编辑器固执):
Path path = Paths.get(".... .xml");
byte[] content = Files.readAllBytes(path);
String s = new String(content, StandardCharsets.UTF_8);
s = s.replaceFirst("^uFEFF", "");
byte[] content2 = s.getBytes(StandardCharsets.UTF_8);
if (content2.length != content.length) {
Files.write(path, content2);
}
您提供的文档和示例代码在 Java 1.8u25 中运行良好:
import static org.junit.Assert.*;
import java.io.IOException;
import java.io.StringReader;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.junit.Test;
import org.w3c.dom.Document;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
public class FatalErrorTest
{
@Test
public void as_given() throws SAXException, IOException, ParserConfigurationException
{
String xml ="<?xml version="1.0" encoding="UTF-8"?>rn<?xfa generator="ff99v250_01" APIVersion="1.4.3139.0"?>rn<jfxpf:XPF xmlns:jfxpf="http://www.xfa.com/schema/xml-package">rn <jfxpf:Package>rn <jfxpf:Resource Location="GenReq">rn <jfxpf:Link ContentType="application/x-jetform-cft" />rn </jfxpf:Resource>rn <jfxpf:Resource Location="default.xml">rn <jfxpf:Content ContentType="text/xml" Location="default.xml">rn <xfa:Data xmlns:xfa="http://www.xfa.org/schema/xfa-data/1.0/">rn <xfa:DataGroup>rn <data xmlns:xfe="http://www.xfa.org/schema/xfa-events/1.0" xfe:script="$config.proto.common.template.uri='GenReq'" xfe:event="$config:load">rn <?jetform ^Dat ^page 1?>rn <FR_NAME>Administrator</FR_NAME>rn <JFWF_DELEGATE />rn <ADHOC_DLN_ACTOR />rn <ADHOC_DLN_MSG />rn <ADHOC_DLN_TIME />rn <ADHOC_DLN_UNITS>Days</ADHOC_DLN_UNITS>rn <ADHOC_RMD_MSG />rn <ADHOC_RMD_TIME />rn <ADHOC_RMD_UNITS>Days</ADHOC_RMD_UNITS>rn <ADHOC_RPT_TIME />rn <ADHOC_RPT_UNITS>Days</ADHOC_RPT_UNITS>rn <CIRCULATETO />rn <COMPLETION />rn <FOLLOWUP />rn <MSGSUBJECT />rn <OTHERFIELD />rn <PRIORITY>Low</PRIORITY>rn <REQUEST />rn <RESPONSE />rn <Submit />rn <ADHOC_VALIDDATA>True</ADHOC_VALIDDATA>rn <JFWF_TRANID>2xxyg9sffane7pwd5j8yv9t49s.1</JFWF_TRANID>rn <JFWF_INSTRUCTION>Initiate a General Request. Fill the request form, then identify the next participant.</JFWF_INSTRUCTION>rn <JFWF_TRANSPORT>HTTP</JFWF_TRANSPORT>rn <JFWF_STATUS>RECEIVED</JFWF_STATUS>rn <JFWF_ACTION />rn <JFWF_CHOICE>*Select Next Participant,Cancel</JFWF_CHOICE>rn <JFWF_VERSION>6.2</JFWF_VERSION>rn <JFWF_READONLY>1</JFWF_READONLY>rn </data>rn </xfa:DataGroup>rn </xfa:Data>rn </jfxpf:Content>rn </jfxpf:Resource>rn </jfxpf:Package>rn</jfxpf:XPF>";
Document doc = DocumentBuilderFactory.newInstance().newDocumentBuilder()
.parse(new InputSource(new StringReader(xml)));
assertNotNull(doc);
}
}