Docx4j加载docx给NullPointerException

Question

我想把docx转换成html。我开始编写与github中给出的示例相同的代码。这只是装货部分。问题就在这里。

import org.docx4j.Docx4J;
import org.docx4j.openpackaging.exceptions.Docx4JException;
import org.docx4j.openpackaging.packages.WordprocessingMLPackage;

public class Main {

    public static void main(String[] args) throws Docx4JException, 
        String inputfilepath = "myfilepathhere";


        OutputStream os = new FileOutputStream(inputfilepath + ".html");

        WordprocessingMLPackage wordMLPackage = Docx4J
                .load(new FileInputStream(inputfilepath));

    }
}

我要去接NullPointerException了。看到github中的异常跟踪并在源代码中导航，我怀疑它与这个类https://github.com/plutext/docx4j/blob/master/src/main/java/org/docx4j/jaxb/Context.java中与JAXB有关的事情有关。

Docx4j源代码可在https://github.com/plutext/docx4j上获得。

异常跟踪：

Exception in thread "main" org.docx4j.openpackaging.exceptions.Docx4JException: Couldn't get [Content_Types].xml from ZipFile
    at org.docx4j.openpackaging.io3.Load3.get(Load3.java:134)
    at org.docx4j.openpackaging.packages.OpcPackage.load(OpcPackage.java:454)
    at org.docx4j.openpackaging.packages.OpcPackage.load(OpcPackage.java:371)
    at org.docx4j.openpackaging.packages.OpcPackage.load(OpcPackage.java:337)
    at org.docx4j.openpackaging.packages.OpcPackage.load(OpcPackage.java:302)
    at org.docx4j.openpackaging.packages.WordprocessingMLPackage.load(WordprocessingMLPackage.java:170)
    at org.docx4j.Docx4J.load(Docx4J.java:195)
    at Main.main(Main.java:29)
Caused by: org.docx4j.openpackaging.exceptions.InvalidFormatException: Bad [Content_Types].xml
    at org.docx4j.openpackaging.contenttype.ContentTypeManager.parseContentTypesFile(ContentTypeManager.java:713)
    at org.docx4j.openpackaging.io3.Load3.get(Load3.java:132)
    ... 7 more
Caused by: java.lang.NullPointerException
    at org.docx4j.openpackaging.contenttype.ContentTypeManager.parseContentTypesFile(ContentTypeManager.java:679)
    ... 8 more

docx文档很好(由Word 2010创建)。我甚至把它解压缩，看看Content_Types.xml是否在那里。它就在那里。

我使用Eclipse和Java 7，我在项目属性中将所有必需的jar文件添加到Java构建路径中。

请帮帮我。

更新：

实际上，当我将这一行从Context.java添加到我的类中时，看看这是否是问题所在。

     JAXBContext.newInstance("org.docx4j.openpackaging.contenttype");

我可以在我的控制台中看到以下异常：

    Exception in thread "main" javax.xml.bind.JAXBException: Provider org.eclipse.persistence.jaxb.JAXBContextFactory not found
 - with linked exception:
[java.lang.ClassNotFoundException: org.eclipse.persistence.jaxb.JAXBContextFactory]
    at javax.xml.bind.ContextFinder.newInstance(Unknown Source)
    at javax.xml.bind.ContextFinder.find(Unknown Source)
    at javax.xml.bind.JAXBContext.newInstance(Unknown Source)
    at javax.xml.bind.JAXBContext.newInstance(Unknown Source)
    at javax.xml.bind.JAXBContext.newInstance(Unknown Source)
    at Main.main(Main.java:26)
Caused by: java.lang.ClassNotFoundException: org.eclipse.persistence.jaxb.JAXBContextFactory
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at javax.xml.bind.ContextFinder.safeLoadClass(Unknown Source)
    ... 6 more

Answer 1

docx4j支持几种不同的JAXB实现：

• 参考实施
• Java 6/7/8中包含的one Sun/Oracle
• EclipseLink MOXy

如果您想使用MOXy，您需要：

1. 相关的EclipseLink jars
2. docx4j-MOXy-JAXBContext-3.0.0.jar (它只包含jaxb.properties文件)

jaxb.properties文件只是说：

javax.xml.bind.context.factory=org.eclipse.persistence.jaxb.JAXBContextFactory

如果您使用的是maven，则只需添加：

<dependency>
<groupId>org.docx4j</groupId>
<artifactId>docx4j-MOXy-JAXBContext</artifactId>
<version>3.0.0</version>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>org.eclipse.persistence.moxy</artifactId>
<version>2.5.1</version>
</dependency>

类路径上是否有docx4j-MOXy-JAXBContext jar？要么删除它，要么添加相关的EclipseLink jars

Answer 2

这个对我有用，试试这个

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.OutputStream;

import org.docx4j.Docx4J;
import org.docx4j.Docx4jProperties;
import org.docx4j.convert.out.HTMLSettings;
import org.docx4j.openpackaging.exceptions.Docx4JException;
import org.docx4j.openpackaging.packages.WordprocessingMLPackage;

public class Test {
    public static void main(String[] args) throws Docx4JException,
            FileNotFoundException {
        String inputfilepath = "c:/file.docx";


        WordprocessingMLPackage wordMLPackage = Docx4J
                .load(new FileInputStream(inputfilepath));

        // HTML exporter setup (required)
        //.. the HTMLSettings object
        HTMLSettings htmlSettings = Docx4J.createHTMLSettings();

        htmlSettings.setImageDirPath(inputfilepath + "_files");
        htmlSettings.setImageTargetUri(inputfilepath.substring(inputfilepath
                .lastIndexOf("/") + 1) + "_files");
        htmlSettings.setWmlPackage(wordMLPackage);

        OutputStream os = new FileOutputStream(inputfilepath + ".html");

        // If you want XHTML output
        Docx4jProperties.setProperty("docx4j.Convert.Out.HTML.OutputMethodXML", true);

        //Prefer the exporter, that uses a xsl transformation
        Docx4J.toHTML(htmlSettings, os, Docx4J.FLAG_EXPORT_PREFER_XSL);

    }

}

Answer 3

确保您拥有所有正确的依赖项(包括适当的JAXB运行时)

implementation 'org.docx4j:docx4j-core:11.4.7'
implementation 'org.docx4j:docx4j-MOXy-JAXBContext:6.0.0'
implementation 'org.docx4j:docx4j-export-fo:11.4.7'
implementation 'org.docx4j:docx4j-JAXB-Internal:8.3.8'
implementation 'org.docx4j:docx4j-JAXB-ReferenceImpl:11.4.7'
implementation 'org.docx4j:docx4j-JAXB-MOXy:11.4.7'
implementation 'jakarta.xml.bind:jakarta.xml.bind-api:4.0.0'
implementation 'org.glassfish.jaxb:jaxb-runtime:4.0.0'
implementation 'jakarta.activation:jakarta.activation-api:2.1.0'