上传图片到阿里云OSS和获取上传图片的外网url的步骤

<form action="/bcis/api/headImgUpload.json" method="post" enctype="multipart/form-data">

    <input type="file" name="file">

    <input type="submit" value="提交">

</form>

2.controller:

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@RequestMapping(value = "/headImgUpload.json", method = RequestMethod.POST)  @ResponseBody  public Map<String, Object> headImgUpload(HttpServletRequest request,MultipartFile file) {    Map<String, Object> value = new HashMap<String, Object>();    value.put("success", true);    value.put("errorCode", 0);    value.put("errorMsg", "");    try {      String head = userService.updateHead(file, 4);//此处是调用上传服务接口，4是需要更新的userId 测试数据。      value.put("data", head);    } catch (IOException e) {      e.printStackTrace();      value.put("success", false);      value.put("errorCode", 200);      value.put("errorMsg", "图片上传失败");    }    return value;  }

3.service   此处要把

@Autowired
private OSSClientUtil ossClient;注进来

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@Override   public String updateHead(MultipartFile file, long userId) throws IOException{     if (file == null || file.getSize() <= 0) {       throw new ImgException("头像不能为空");     }     String name = ossClient.uploadImg2Oss(file);     String imgUrl = ossClient.getImgUrl(name);     userDao.updateHead(userId, imgUrl);//只是本地上传使用的     return imgUrl;   }

4.上传的阿里云的帮助类OSSClientUtil 

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import java.io.*; import java.net.URL; import java.util.Date; import java.util.Random;   import com.fndsoft.bcis.exception.ImgException; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory;   import com.aliyun.oss.OSSClient; import com.aliyun.oss.model.ObjectMetadata; import com.aliyun.oss.model.PutObjectResult; import org.springframework.util.StringUtils; import org.springframework.web.multipart.MultipartFile;   /**  * 阿里云 OSS文件类  *  * @author YuanDuDu  */ public class OSSClientUtil {     Log log = LogFactory.getLog(OSSClientUtil.class);   // endpoint以杭州为例，其它region请按实际情况填写   private String endpoint = "您的endpoint";   // accessKey   private String accessKeyId = "您的accessKeyId";   private String accessKeySecret = "您的accessKeySecret";   //空间   private String bucketName = "bcis";   //文件存储目录   private String filedir = "data/";     private OSSClient ossClient;     public OSSClientUtil() {     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();   }     /**    * 上传图片    *    * @param url    */   public void uploadImg2Oss(String url) {     File fileOnServer = new File(url);     FileInputStream fin;     try {       fin = new FileInputStream(fileOnServer);       String[] split = url.split("/");       this.uploadFile2OSS(fin, split[split.length - 1]);     } catch (FileNotFoundException e) {       throw new ImgException("图片上传失败");     }   }       public String uploadImg2Oss(MultipartFile file) {     if (file.getSize() > 1024 * 1024) {       throw new ImgException("上传图片大小不能超过1M！");     }     String originalFilename = file.getOriginalFilename();     String substring = originalFilename.substring(originalFilename.lastIndexOf(".")).toLowerCase();     Random random = new Random();     String name = random.nextInt(10000) + System.currentTimeMillis() + substring;     try {       InputStream inputStream = file.getInputStream();       this.uploadFile2OSS(inputStream, name);       return name;     } catch (Exception e) {       throw new ImgException("图片上传失败");     }   }     /**    * 获得图片路径    *    * @param fileUrl    * @return    */   public String getImgUrl(String fileUrl) {     if (!StringUtils.isEmpty(fileUrl)) {       String[] split = fileUrl.split("/");       return this.getUrl(this.filedir + split[split.length - 1]);     }     return null;   }     /**    * 上传到OSS服务器  如果同名文件会覆盖服务器上的    *    * @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 = "";     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);       //上传文件       PutObjectResult putResult = ossClient.putObject(bucketName, filedir + fileName, instream, objectMetadata);       ret = putResult.getETag();     } catch (IOException e) {       log.error(e.getMessage(), e);     } finally {       try {         if (instream != null) {           instream.close();         }       } catch (IOException e) {         e.printStackTrace();       }     }     return ret;   }     /**    * 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 (FilenameExtension.equalsIgnoreCase(".bmp")) {       return "image/bmp";     }     if (FilenameExtension.equalsIgnoreCase(".gif")) {       return "image/gif";     }     if (FilenameExtension.equalsIgnoreCase(".jpeg") ||         FilenameExtension.equalsIgnoreCase(".jpg") ||         FilenameExtension.equalsIgnoreCase(".png")) {       return "image/jpeg";     }     if (FilenameExtension.equalsIgnoreCase(".html")) {       return "text/html";     }     if (FilenameExtension.equalsIgnoreCase(".txt")) {       return "text/plain";     }     if (FilenameExtension.equalsIgnoreCase(".vsd")) {       return "application/vnd.visio";     }     if (FilenameExtension.equalsIgnoreCase(".pptx") ||         FilenameExtension.equalsIgnoreCase(".ppt")) {       return "application/vnd.ms-powerpoint";     }     if (FilenameExtension.equalsIgnoreCase(".docx") ||         FilenameExtension.equalsIgnoreCase(".doc")) {       return "application/msword";     }     if (FilenameExtension.equalsIgnoreCase(".xml")) {       return "text/xml";     }     return "image/jpeg";   }     /**    * 获得url链接    *    * @param key    * @return    */   public String getUrl(String key) {     // 设置URL过期时间为10年  3600l* 1000*24*365*10     Date expiration = new Date(new Date().getTime() + 3600l * 1000 * 24 * 365 * 10);     // 生成URL     URL url = ossClient.generatePresignedUrl(bucketName, key, expiration);     if (url != null) {       return url.toString();     }     return null;   } }

　　

6.需要引入的jar包：gradle配置为：

compile 'com.aliyun.oss:aliyun-sdk-oss:2.2.3'