springboot实战之office文档在线预览

#安装文件

    yum -y install libreoffice

    #安装中文包

    yum -y install libreoffice-langpack-zh-Han*

    #安装的目录在/usr/lib64/libreoffice

#centos
  /usr/bin/libreoffice  --invisible --convert-to pdf  <待转换的word路径> --outdir <生成的pdf路径>

  比如：/usr/bin/libreoffice  --invisible --convert-to pdf  test.txt --outdir abc


  # windows
  soffice.exe --headless --invisible --convert-to pdf test.txt --outdir d:\abc

<!-- office预览相关-->
    <dependency>
      <groupId>org.jodconverter</groupId>
      <artifactId>jodconverter-core</artifactId>
    </dependency>
    <dependency>
      <groupId>org.jodconverter</groupId>
      <artifactId>jodconverter-local</artifactId>
    </dependency>
    <dependency>
      <groupId>org.jodconverter</groupId>
      <artifactId>jodconverter-spring-boot-starter</artifactId>
    </dependency>
    <dependency>
      <groupId>org.jodconverter</groupId>
      <artifactId>jodconverter-online</artifactId>
    </dependency>
    <dependency>
      <groupId>org.libreoffice</groupId>
      <artifactId>ridl</artifactId>
    </dependency>

jodconverter:
  local:
    enabled: true
    office-home: ${office.home}
    port-numbers: 8100,8101,8102
    max-tasks-per-process: 100
  store:
    path: ${store.path}

<profiles>
    <profile>
      <id>win</id>
      <properties>
        <office.home>D:/Program Files/LibreOffice</office.home>
        <store.path>D:/data/preview</store.path>
      </properties>
      <activation>
        <activeByDefault>true</activeByDefault>
      </activation>
    </profile>
    <profile>
      <id>linux</id>
      <properties>
        <office.home>/usr/lib64/libreoffice</office.home>
        <store.path>/data/preview</store.path>
      </properties>
      <activation>
        <activeByDefault>false</activeByDefault>
      </activation>
    </profile>
  </profiles>

@Service
@Slf4j
public class PreviewServiceImpl implements PreviewService {

  @Value("${jodconverter.store.path}")
  private String storePath;

  @Autowired
  private DocumentConverter documentConverter;

  @Override
  public FileConvertResultDTO convertFile2pdf(File sourceFile,String fileExt) {
    FileConvertResultDTO fileConvertResultDTO = new FileConvertResultDTO();
    try {
      fileExt = fileExt.toLowerCase();
      String fileName = FileUtil.getWithoutExtension(sourceFile.getName());
      String targetFileExt = getTargetFileExt(fileExt);
      File targetFile = new File(storePath+ FileUtil.SLASH_ONE + fileName + FileUtil.DOT + targetFileExt);
      documentConverter.convert(sourceFile).as(DefaultDocumentFormatRegistry.getFormatByExtension(fileExt))
          .to(targetFile).as(DefaultDocumentFormatRegistry.getFormatByExtension(targetFileExt)).execute();
      fileConvertResultDTO.setStatus("success");
      fileConvertResultDTO.setTargetFileName(targetFile.getName());
    } catch (OfficeException e) {
      log.error("convertFile2pdf error : " + e.getMessage(),e);
      fileConvertResultDTO.setStatus("fail");
    }
    return fileConvertResultDTO;

  }

  @Override
  public FileConvertResultDTO convertInputStream2pdf(InputStream in, String fileName, String fileExt) {
    FileConvertResultDTO fileConvertResultDTO = new FileConvertResultDTO();
    try {
      fileExt = fileExt.toLowerCase();
      fileName = FileUtil.getWithoutExtension(fileName);
      String targetFileExt = getTargetFileExt(fileExt);
      File targetFile = new File(storePath+ FileUtil.SLASH_ONE + fileName + FileUtil.DOT + targetFileExt);
      documentConverter.convert(in).as(DefaultDocumentFormatRegistry.getFormatByExtension(fileExt))
          .to(targetFile).as(DefaultDocumentFormatRegistry.getFormatByExtension(targetFileExt)).execute();
      fileConvertResultDTO.setStatus("success");
      fileConvertResultDTO.setTargetFileName(targetFile.getName());
    } catch (OfficeException e) {
      log.error("convertInputStream2pdf error : " + e.getMessage(),e);
      fileConvertResultDTO.setStatus("fail");
    }
    return fileConvertResultDTO;
  }

  /**
   * 获取想要转换的格式类型
   * @return
   */
  private String getTargetFileExt(String originFileExt){
     if(Constants.fileType2Htmls.contains(originFileExt)){
       return FileUtil.HTML;
     }
     return FileUtil.PDF;
  }

  @PostConstruct
  private void init(){
    File targetDir = new File(storePath);
    if(!targetDir.exists()){
      targetDir.mkdirs();
    }
  }
}

@GetMapping(value="/readFile")
  public ResponseEntity<byte[]> readFile(String fileName){
    if(StringUtils.isBlank(fileName)){
      log.warn("fileName is blank");
      return new ResponseEntity<>(HttpStatus.BAD_REQUEST);
    }

    String fileExt = FileUtil.getExtension(fileName);
    if(StringUtils.isBlank(fileExt)){
      fileName = fileName + FileUtil.PDF;
    }
    String filePath = storePath + FileUtil.SLASH_ONE + fileName;
    File file = new File(filePath);


    if(!file.exists()){
        log.warn("fileName:{} is not found",fileName);
        return new ResponseEntity<>(HttpStatus.NOT_FOUND);
    }

    try {
      //判断文件类型
      String mimeType = URLConnection.guessContentTypeFromName(file.getName());
      if(mimeType == null) {
        mimeType = "application/octet-stream";
      }
      response.setContentType(mimeType);

      //设置文件响应大小
      response.setContentLengthLong(file.length());

      byte[] bytes = FileUtil.readFileToByteArray(file);
      response.getOutputStream().write(bytes);
      return new ResponseEntity<>(bytes,HttpStatus.OK);
    } catch (IOException e) {
      log.error("readFile error:"+e.getMessage(),e);
    }
    return new ResponseEntity<>(HttpStatus.EXPECTATION_FAILED);

  }