若依（ruoyi）开发框架支持将word文档等文件转pdf并通过接口实时访问返回pdf水印文件

文档内链：通过Java对word/xls/image/ppt转pdf文件并添加水印信息

java后台端代码

@Log(title = "预览上传文件", businessType = BusinessType.OTHER)
@RequestMapping("/queryPdfFile")
public void queryPdfFile(
        @RequestParam(value = "fileUrl",required = true)String fileUrl,
        HttpServletResponse response
)throws  Exception{

    //上传文件目录
    String defaultBaseDir = RuoYiConfig.getProfile();
    //文件真实位置
    String filePath = defaultBaseDir+fileUrl.substring(fileUrl.indexOf("/upload"));
    logger.info("文件FileUrl地址：{}",filePath);

    String fileStr = fileUrl.substring(fileUrl.lastIndexOf("/"));
    //文件名称
    String fileName = fileStr.substring(1);
    //文件类型
    String fileType = fileName.substring(fileName.lastIndexOf(".")+1);


    //获取原文件流数据对象
    FileInputStream inputStream = new FileInputStream(filePath);
    //生成临时文件
    File tempPdfFile = File.createTempFile(fileName+"_convertpdf_"+System.currentTimeMillis()+"",".pdf");
    FileOutputStream outputStream = new FileOutputStream(tempPdfFile);

    //根据文件类型选择不同转换pdf方法类
    if( "jpg".equals(fileType) || "png".equals(fileType) || "jpeg".equals(fileType) ){
        PdfConverUtil.imgToPdf(inputStream, outputStream);
    }else if( "doc".equals(fileType) || "docx".equals(fileType) ){
        PdfConverUtil.wordTopdfByAspose(inputStream, outputStream);
    }else if( "xls".equals(fileType) || "xlsx".equals(fileType) ){
        PdfConverUtil.excelToPdf(inputStream, outputStream);
    }else{
        logger.error("文件类型异常!fileType:{}",fileType);
        return ;
    }

    logger.info("文件fileName:{}转pdf完成~",fileName);

    /*pdf文件加水印信息*/
    File tempWaterMarkPdfFile = File.createTempFile(fileName+"_watermark_"+System.currentTimeMillis()+"",".pdf");
    // 要输出的pdf文件
    FileOutputStream outputStreamMarkPdf = new FileOutputStream(tempWaterMarkPdfFile);
    BufferedOutputStream bos = new BufferedOutputStream(outputStreamMarkPdf);
    // 将pdf文件先加水印然后输出
    setWatermarkText(bos, new FileInputStream(tempPdfFile) ,fileName+(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date())));

    logger.info("文件fileName:{}添加水印watermark完成~",fileName);

    FileInputStream fileInputStream = new FileInputStream(tempWaterMarkPdfFile);
    InputStream fis = new BufferedInputStream(fileInputStream);
    byte[] buffer = new byte[fis.available()];
    fis.read(buffer);
    fis.close();

    //设置响应头以指示浏览器下载文件
    response.setContentType("application/pdf");
    response.setHeader("Content-Disposition", "inline; filename=" + URLEncoder.encode(fileName,"UTF-8"));

    OutputStream os = new BufferedOutputStream(response.getOutputStream());
    os.write(buffer);
    os.flush();

}