documents4j 文档转换

documents4j 是一个 Java 库，可以将文档转换为另一种文档格式。

https://github.com/documents4j/documents4j

<parent>
    <artifactId>spring-boot-starter-parent</artifactId>
    <groupId>org.springframework.boot</groupId>
    <version>2.6.0</version>
</parent>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>com.documents4j</groupId>
        <artifactId>documents4j-local</artifactId>
        <version>1.1.5</version>
    </dependency>
    <dependency>
        <groupId>com.documents4j</groupId>
        <artifactId>documents4j-transformer-msoffice-word</artifactId>
        <version>1.1.5</version>
    </dependency>
</dependencies>

@RequestMapping("/to")
@RestController
public class PdfController {
    
    

    /**
     * doc文件转pdf
     *
     * @param path 文件路径
     */
    @RequestMapping("/doc2pdf")
    public ResponseEntity<byte[]> doc2pdfFileUpload(String path) throws IOException {
    
    
        URL url = new URL(path);
        URLConnection conn = url.openConnection();
        InputStream inputStream = conn.getInputStream();

        return doc2Pdf(inputStream, ".doc", "fileName.pdf");
    }

    /**
     * docx、xlsx、转pdf
     *
     * @param fileType docx、doc、xls、xlsx
     * @param fileName pdf名称
     */
    public ResponseEntity<byte[]> doc2Pdf(InputStream docxInputStream, String fileType, String fileName) throws IOException {
    
    
        // 转换后的pdf临时路径
        File outputFile = new File("C:/Users/admin002/Desktop/folder/doc/" + fileName);

        IConverter converter = LocalConverter.builder().build();
        ResponseEntity<byte[]> fileResult = null;
        try (OutputStream outputStream = Files.newOutputStream(outputFile.toPath());
             // 导出pdf文件给前端
             FileInputStream inputStream = new FileInputStream(outputFile);
             ) {
    
    
            if (".docx".equals(fileType)) {
    
    
                converter.convert(docxInputStream).as(DocumentType.DOCX).to(outputStream).as(DocumentType.PDF).execute();
            } else if (".doc".equals(fileType)) {
    
    
                converter.convert(docxInputStream).as(DocumentType.DOC).to(outputStream).as(DocumentType.PDF).execute();
            } else if (".xls".equals(fileType)) {
    
    
                converter.convert(docxInputStream).as(DocumentType.XLS).to(outputStream).as(DocumentType.PDF).execute();
            } else if (".xlsx".equals(fileType)) {
    
    
                converter.convert(docxInputStream).as(DocumentType.XLSX).to(outputStream).as(DocumentType.PDF).execute();
            }

            byte[] bytes = new byte[(int) outputFile.length()];
            inputStream.read(bytes);

            HttpHeaders headers = new HttpHeaders();
            // 此处pdf名称需要传入
            headers.set("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
            fileResult = new ResponseEntity(bytes, headers, HttpStatus.OK);

        } finally {
    
    
            docxInputStream.close();
        }
        return fileResult;
    }

}

以上方式依赖于Windows上的MS Word、MS Excel，必须使用Windows。

只有在以下情况下才能运行 LocalConverter构建：

• JVM在MS Windows平台上运行，该平台附带VBS的Microsoft脚本主机。
• MS Word 版本必须在2007 或更高版本。安装了 PDF 插件时，才支持 PDF 转换。该插件包含在了Word 2010及更高版本的MS Word中。

未完待续。。。。