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Java调用LibreOffice将文档转为PDF
2023-06-15 19:05:34 深夜i     --     --
Java LibreOffice PDF转换

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LibreOffice是一款免费的办公软件套件,可以用于创建和编辑文档、表格、幻灯片等。Java作为一种流行的编程语言,可以很方便地调用LibreOffice的API来将文档转换为PDF格式。本文将介绍如何使用Java调用LibreOffice将文档转换为PDF格式,并提供示例代码。

首先,我们需要下载并安装LibreOffice。然后,我们需要启动它的服务进程。在Windows上,可以使用以下命令:


"C:\Program Files\LibreOffice\program\soffice.exe" --headless --invisible --norestore --convert-to pdf *.docx

在Linux上,可以使用以下命令:


/usr/bin/libreoffice --headless --invisible --convert-to pdf *.docx

一旦启动了服务进程,我们就可以通过Java代码来使用LibreOffice的API。以下是一个将.docx文件转换为PDF格式的示例代码:


import com.sun.star.beans.PropertyValue;

import com.sun.star.frame.XComponentLoader;

import com.sun.star.lang.XComponent;

import com.sun.star.lang.XServiceInfo;

import com.sun.star.task.XStatusIndicator;

import com.sun.star.uno.UnoRuntime;

import com.sun.star.uno.XComponentContext;

public class DocToPdfConverter {

  private XComponentContext context;

  private XComponentLoader loader;

  public DocToPdfConverter(XComponentContext context) {

    this.context = context;

    this.loader = (XComponentLoader) UnoRuntime.queryInterface(XComponentLoader.class, getDesktopService("com.sun.star.frame.Desktop"));

  }

  public void convertDocToPdf(String inputFile, String outputFile) throws Exception {

    PropertyValue[] conversionProperties = new PropertyValue[2];

    conversionProperties[0] = new PropertyValue();

    conversionProperties[0].Name = "Hidden";

    conversionProperties[0].Value = Boolean.TRUE;

    conversionProperties[1] = new PropertyValue();

    conversionProperties[1].Name = "MacroExecutionMode";

    conversionProperties[1].Value = com.sun.star.document.MacroExecMode.ALWAYS_EXECUTE_NO_WARN;

    XComponent document = loader.loadComponentFromURL(inputFile, "_blank", 0, conversionProperties);

    XServiceInfo docServiceInfo = (XServiceInfo) UnoRuntime.queryInterface(XServiceInfo.class, document);

    if (docServiceInfo.supportsService("com.sun.star.text.GenericTextDocument")) {

      PropertyValue[] saveProperties = new PropertyValue[3];

      saveProperties[0] = new PropertyValue();

      saveProperties[0].Name = "FilterName";

      saveProperties[0].Value = "writer_pdf_Export";

      saveProperties[1] = new PropertyValue();

      saveProperties[1].Name = "Overwrite";

      saveProperties[1].Value = true;

      saveProperties[2] = new PropertyValue();

      saveProperties[2].Name = "UseLosslessCompression";

      saveProperties[2].Value = true;

      loader = (XComponentLoader) UnoRuntime.queryInterface(XComponentLoader.class, getDesktopService("com.sun.star.frame.Desktop"));

      XStatusIndicator indicator = (XStatusIndicator) UnoRuntime.queryInterface(XStatusIndicator.class, getDesktopService("com.sun.star.frame.StatusIndicator"));

      loader.setPropertyValue("StatusIndicator", indicator);

      loader.storeToURL(outputFile, saveProperties);

    } else {

      throw new Exception("Unsupported document type");

    }

  }

  private Object getDesktopService(String serviceName) {

    XComponent desktop = null;

    try {

      desktop = loader.getDesktop();

    } catch (Exception ex) {

      throw new RuntimeException("Failed to initialize LibreOffice", ex);

    }

    return UnoRuntime.queryInterface(XComponent.class, desktop.getServiceManager().createInstanceWithContext(serviceName, context));

  }

}

在上面的代码中,我们使用了LibreOffice内置的writer_pdf_Export过滤器将文档转换为PDF格式,并使用了XStatusIndicator类来实现状态栏的显示。

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