1，导入IMM的依赖

 <!--阿里云IMM需要的包-->
        <dependency>
            <groupId>com.aliyun</groupId>
            <artifactId>aliyun-java-sdk-core</artifactId>
            <version>4.1.2</version>
        </dependency>
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.8.5</version>
        </dependency>
        <dependency>
            <groupId>com.aliyun</groupId>
            <artifactId>aliyun-java-sdk-imm</artifactId>
            <version>1.14.0</version>
        </dependency>

2，使用阿里云帐号的accessKeyId,secret才能够使用阿里云Java依赖

#IMM智能媒体管理
imm:
  accessKeyId: 
  secret: 
  regionId: 
  projectName: 

3，文档的预览是文件是存储在阿里云oss上面，IMM通过文档转换，把转换后的文件再存回oss，然后通过前端引擎去访问oss上的文件

@Override
    public String findImm_pathByFile_path(String file_path) throws ClientException, UnsupportedEncodingException {
        String find_path = cloudDiskMapper.findImm_pathByFile_path(file_path);
        if (find_path!=null) {
            return find_path;
        }else{
            IAcsClient client = new DefaultAcsClient(DefaultProfile.getProfile(regionId, accessKeyId,secret));
            String DecodeFile_path = URLDecoder.decode(file_path,"utf-8");
            String[] split = DecodeFile_path.split("/");
            String file_name = split[split.length-1];
            // 创建文档转换异步请求任务
            CreateOfficeConversionTaskRequest req = new CreateOfficeConversionTaskRequest();
            req.setProject(projectName);
            // 设置待转换对文件OSS路径
            req.setSrcUri(DecodeFile_path.replace(OLDCHAR,NEWCHAR));
            System.err.println(DecodeFile_path.replace(OLDCHAR,NEWCHAR));
            // 设置文件输出格式为 vector
            req.setTgtType("vector");
            // 设置转换后的输出路径
            req.setTgtUri(NEWURL+file_name);
            System.err.println(NEWURL+file_name);
            CreateOfficeConversionTaskResponse res = client.getAcsResponse(req);
            String taskId = res.getTaskId();
            // 获取文档转换任务结果，最多轮询 30 次
            // 每次轮询的间隔为 1 秒
            GetOfficeConversionTaskRequest getOfficeConversionTaskRequest = new GetOfficeConversionTaskRequest();
            getOfficeConversionTaskRequest.setProject(projectName);
            getOfficeConversionTaskRequest.setTaskId(taskId);
            String imm_path = IMMURL+file_name;
            cloudDiskMapper.addImm_path(file_path,imm_path);
            return imm_path;
        }

    }