本文主要是介绍轻量级SpringBoot Office文档在线预览框架，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

框架简介

介绍：基于开源项目KkFileView源码提取出,封装成仅用于 Office文档预览(格式转换) 功能的一个通用组件; 原理是把Word转成PDF,PPT转成PDF,Excel转成HTML;
利用浏览器可以直接打开PDF和HTML的特点实现在线预览;

环境安装：目前支持OpenOffice或LibreOffice实现文档格式转换,请自行安装(推荐使用LibreOffice,转出的格式相对较好)

安装 LibreOffice教程: https://www.cnblogs.com/lwjQAQ/p/16505854.html

LibreOffice下载: https://zh-cn.libreoffice.org/

OpenOffice下载: http://www.openoffice.org/

项目运行环境: jdk1.8 SpringBoot2.0

Demo地址：https://github.com/TomHusky/kkfilemini-spring-boot-starter-demo

GitHub：https://github.com/TomHusky/kkfilemini-spring-boot-starter
Gitee：https://gitee.com/luowenjie98/kkfilemini-spring-boot-starter

在线试用地址：https://tools.go996.cn/docView/

maven依赖坐标

目前暂未上传maven中央仓库，需要自行下载源码install之后使用

<dependency>
    <groupId>io.github.tomhusky</groupId>
    <artifactId>office-preview-spring-boot-starter</artifactId>
    <version>1.0.0</version>
</dependency>

配置说明

yml

office:
  plugin:
    home: C:\\Program Files\\LibreOffice
    task:
      timeout: 1M
    server:
      ports: 2001,2002
  cache:
    enabled: true
    type: default
    file:
      dir: D:\project\demo
    clean:
      cron: 0 0 1 * * *

properties

office.plugin.home=C:\\Program Files\\LibreOffice
office.plugin.task.timeout=1M
office.plugin.server.ports=2001,2002
office.cache.enabled=true
office.cache.type=default
office.cache.file.dir=officeFile
office.cache.clean.cron=0 0 1 * * *

快速使用

直接注入

@Resource
private KKFileViewComponent kkFileViewComponent;

OfficeFileViewComponent中提供的方法

代码示例

@Service
public class FileServiceImpl implements FileService {

    private final Logger logger = LoggerFactory.getLogger(getClass());

    @Resource
    private KKFileViewComponent fileViewComponent;

    @Autowired
    private ObjectMapper objectMapper;

    private final Map<String, FileCacheVo> tempFilePathCache = new ConcurrentHashMap<>();

    private static final Set<String> ALLOW_FILE_TYPE = CollUtil.set(false, ".doc", ".docx", ".pdf", ".xlsx", ".xls", ".pptx", ".ppt");

    private static final List<FileInfoRespVo> FILE_SET = new CopyOnWriteArrayList<>();

    @Override
    public FileInfoRespVo uploadFile(MultipartFile file) {
        String originalFilename = file.getOriginalFilename();
        assert originalFilename != null;

        String fileType = originalFilename.substring(originalFilename.lastIndexOf('.'));
        if (!ALLOW_FILE_TYPE.contains(fileType)) {
            throw new RuntimeException("不支持的文件类型！");
        }
        try {
            String fileNo = IdUtil.getSnowflakeNextIdStr();
            File tempFile = File.createTempFile(fileNo, fileType);
            FileUtil.writeFromStream(file.getInputStream(), tempFile, true);

            FileInfoRespVo fileInfoRespVo = new FileInfoRespVo();
            fileInfoRespVo.setFileNo(fileNo);
            fileInfoRespVo.setFileName(originalFilename);
            fileInfoRespVo.setFileSuffix(fileType);
            fileInfoRespVo.setCreateTime(new Date());

            FILE_SET.add(fileInfoRespVo);

            FileCacheVo fileCacheVo = new FileCacheVo();
            fileCacheVo.setFileNo(fileNo);
            fileCacheVo.setFileSuffix(fileType);
            fileCacheVo.setFileName(fileNo + fileType);
            fileCacheVo.setOriginalName(originalFilename);
            fileCacheVo.setPath(tempFile.getPath());

            // 添加预览文档到缓存
            fileViewComponent.addFileToCache(tempFile, fileNo);

            tempFilePathCache.put(fileNo, fileCacheVo);

            return fileInfoRespVo;
        } catch (Exception e) {
            logger.error(e.getMessage(), e);
            throw new RuntimeException("上传文件失败");
        }
    }

    @Override
    public void viewFile(String fileNo, HttpServletResponse response) {
        response.addHeader("access-control-allow-methods", "GET");
        response.addHeader("access-control-allow-headers", "Content-Type");
        FileCacheVo fileCacheVo = tempFilePathCache.get(fileNo);
        if (fileCacheVo == null) {
            responseFailure("文件不存在！", response);
            return;
        }
        boolean existFile = fileViewComponent.cacheExistFile(fileNo);
        if (!existFile) {
            responseFailure("文件已经不存在！", response);
            return;
        }
        // 预览文档
        fileViewComponent.viewCacheFile(response, fileNo);
    }

    private void responseFailure(String msg, HttpServletResponse response) {
        response.setContentType("application/json; charset=utf-8");
        response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
        try (PrintWriter pw = response.getWriter()) {
            String result = objectMapper.writeValueAsString(R.fail(msg));
            pw.write(result);
        } catch (IOException e) {
            logger.error(e.getMessage(), e);
        }
    }
}

前端使用方式

注意：viewFile是接入的后端服务自己接口，本组件不直接提供接口

 axios.get("http://localhost:8081/officePreview/viewFile?fileNo=" + item.fileNo, {responseType: "blob"}).then(res => {
    let type = res.headers['file-type'];
    let blob;
    if (type === "html") {
        blob = new Blob([res.data], {type: 'text/html'});
    } else {
        blob = new Blob([res.data], {type: 'application/pdf'})
    }
    let pdfSrc = window.URL.createObjectURL(blob)
    window.open(pdfSrc)//新窗口打开，借用浏览器查看文档
}).catch(error => {
    alert("预览失败！");
})

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