Java实现阿里云oss文预览上传和下载

第一步：引入maven依赖

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<dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> </dependency> <!--阿里云oss--> <dependency> <groupId>com.aliyun.oss</groupId> <artifactId>aliyun-sdk-oss</artifactId> <version>2.8.2</version> </dependency>

第二步：阿里云oss工具类

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import com.aliyun.oss.OSSClient; import com.aliyun.oss.model.*; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import java.io.*;   /**  * 阿里云 OSS文件类  */ public class AliOssCloudUtil {     Log log = LogFactory.getLog(AliOssCloudUtil.class);       /**      * 用户的存储空间所在数据中心的访问域名      */     private String endpoint = "oss-cn-hangzhou.aliyuncs.com";       /**      * OSS签名key      */     private String accessKeyId = "LTAI5tSJSDtUaXXXX";       /**      * OSS签名密钥      */     private static final String accessKeySecret = "AQLmguaT1BFsOi5oe07iMUXXXXX";     /**      * 存储空间名称      */     private static final String bucketName = "oss-uav-oss";         //文件存储目录     private String filedir = "uav/";       private OSSClient ossClient;       public AliOssCloudUtil() {         ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecret);     }       public String getFiledir() {         return this.filedir;     }       //自定义上传文件夹     public AliOssCloudUtil(String filedir) {         this.filedir = filedir;         ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecret);     }         /**      * 初始化      */     public void init() {         ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecret);     }       /**      * 销毁      */     public void destory() {         ossClient.shutdown();     }         /**      * 上传到OSS服务器      *      * @param instream 文件流      * @param fileName 文件名称 包括后缀名      * @return 出错返回"" ,唯一MD5数字签名      */     public String uploadFile2OSS(InputStream instream, String fileName) {         String ret = "";         // 判断bucket是否已经存在,不存在进行创建         if (!doesBucketExist()) {             createBucket();         }         try {             //创建上传Object的Metadata             ObjectMetadata objectMetadata = new ObjectMetadata();             objectMetadata.setContentLength(instream.available());             objectMetadata.setCacheControl("no-cache");             objectMetadata.setHeader("Pragma", "no-cache");             objectMetadata.setContentType(getcontentType(fileName.substring(fileName.lastIndexOf("."))));             objectMetadata.setContentDisposition("inline;filename=" + fileName);             // 指定上传文件操作时是否覆盖同名Object。             // 不指定x-oss-forbid-overwrite时，默认覆盖同名Object。             // 指定x-oss-forbid-overwrite为false时，表示允许覆盖同名Object。             // 指定x-oss-forbid-overwrite为true时，表示禁止覆盖同名Object，如果同名Object已存在，程序将报错。             objectMetadata.setHeader("x-oss-forbid-overwrite", "false");             String objectName = filedir + fileName;               //上传文件             ossClient.putObject(bucketName, objectName, instream, objectMetadata);             // 封装  url 路径             String url = "https://" + bucketName + "." + endpoint + "/" + objectName;             ret = url;         } catch (IOException e) {             log.error(e.getMessage(), e);         } finally {             ossClient.shutdown();             try {                 if (instream != null) {                     instream.close();                 }             } catch (IOException e) {                 e.printStackTrace();             }         }         return ret;     }         /**      * 判断文件是否存在。doesObjectExist还有一个参数isOnlyInOSS，      * 如果为true则忽略302重定向或镜像；如果为false，则考虑302重定向或镜像。      * yourObjectName 表示上传文件到OSS时需要指定包含文件后缀在内的完整路径，例如abc/efg/123.jpg。      *      * @return 存在返回true      */     public boolean doesObjectExist(String objectName) {         boolean exists = ossClient.doesObjectExist(bucketName, filedir + objectName);         return exists;     }       /**      * 判断Bucket是否存在      *      * @return 存在返回true      */     public boolean doesBucketExist() {         boolean exists = ossClient.doesBucketExist(bucketName);         return exists;     }       /**      * 创建Bucket      */     public void createBucket() {         CreateBucketRequest createBucketRequest = new CreateBucketRequest(bucketName);         // 设置bucket权限为公共读，默认是私有读写         createBucketRequest.setCannedACL(CannedAccessControlList.PublicRead);         // 设置bucket存储类型为低频访问类型，默认是标准类型         createBucketRequest.setStorageClass(StorageClass.IA);         boolean exists = ossClient.doesBucketExist(bucketName);         if (!exists) {             try {                 ossClient.createBucket(createBucketRequest);                 // 关闭client                 ossClient.shutdown();             } catch (Exception e) {                 log.error(e.getMessage());             }         }     }       /**      * Description: 判断OSS服务文件上传时文件的contentType      *      * @param FilenameExtension 文件后缀      * @return String      */     public static String getcontentType(String FilenameExtension) {         if (".bmp".equalsIgnoreCase(FilenameExtension)) {             return "image/bmp";         }         if (".gif".equalsIgnoreCase(FilenameExtension)) {             return "image/gif";         }         if (".jpeg".equalsIgnoreCase(FilenameExtension)                 || ".jpg".equalsIgnoreCase(FilenameExtension)                 || ".png".equalsIgnoreCase(FilenameExtension)) {             return "image/jpg";         }         if (".html".equalsIgnoreCase(FilenameExtension)) {             return "text/html";         }         if (".txt".equalsIgnoreCase(FilenameExtension)) {             return "text/plain";         }         if (".vsd".equalsIgnoreCase(FilenameExtension)) {             return "application/vnd.visio";         }         if (".ppt".equalsIgnoreCase(FilenameExtension) || "pptx".equalsIgnoreCase(FilenameExtension)) {             return "application/vnd.ms-powerpoint";         }         if (".doc".equalsIgnoreCase(FilenameExtension) || "docx".equalsIgnoreCase(FilenameExtension)) {             return "application/msword";         }         if (".xml".equalsIgnoreCase(FilenameExtension)) {             return "text/xml";         }         if (".mp4".equalsIgnoreCase(FilenameExtension)) {             return "video/mp4";         }         if (".mp3".equalsIgnoreCase(FilenameExtension)) {             return "audio/mp3";         }         return "text/html";     }         /**      * @Description: 根据文件路径获取InputStream流      */     public InputStream getInputStreamByFileUrl(String fileName) {         // ossObject包含文件所在的存储空间名称、文件名称、文件元信息以及一个输入流。         OSSObject ossObject = ossClient.getObject(bucketName, fileName);         return ossObject.getObjectContent();     } }

第三步：上传下载文件

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public class FlightFileController {       @ResponseBody     @PostMapping("/upload")     public Response upload(@RequestParam("file") MultipartFile file) {         String filename = file.getResource().getFilename();         //文件名         String pattern = "yyyy-MM-dd";         String dir = DateFormatUtils.format(new Date(), pattern);         String name = "";         if (getFileType(filename) == 0) {             name = OssBucketEnum.VIDEO.getValue() + "/" + dir + "/" + filename;         } else {             name = OssBucketEnum.PICTURE.getValue() + "/" + dir + "/" + filename;         }         InputStream inputStream = null;         try {             inputStream = file.getInputStream();         } catch (IOException e) {             e.printStackTrace();             log.info("上传失败");         }         AliOssCloudUtil util = new AliOssCloudUtil();         //上传成功返回可直接查看文件的url         String url = util.uploadFile2OSS(inputStream, name);         return Response.success(url);     }       public int getFileType(String fileName) {         int i = 0;         FileNameMap fileNameMap = URLConnection.getFileNameMap();         String contentTypeFor = fileNameMap.getContentTypeFor(fileName);         //下面是进一判断是视频和图片的区别         if (contentTypeFor != null) {// 当为图片时不为空，是视频时为空             i = 1;         }         return i;     }       @PostMapping("/downLoad")     public void downloadFile(String fileName, HttpServletResponse response) {         try {             AliOssCloudUtil ossClientUtil = new AliOssCloudUtil();             InputStream is = ossClientUtil.getInputStreamByFileUrl(ossClientUtil.getFiledir() + fileName);             // 配置文件下载             response.setHeader("content-type", "application/octet-stream");             response.setContentType("application/octet-stream");             // 下载文件能正常显示中文             response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));             OutputStream os = response.getOutputStream();             byte[] b = new byte[1024];             int len = -1;             while ((len = is.read(b)) != -1) {                 os.write(b, 0, len);             }             is.close();             os.close();         } catch (Exception e) {             e.printStackTrace();         }     }   }