上传图片到阿里云OSS和获取上传图片的外网url的步骤

啥都不说  直接上代码

1.html:

<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:

 @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

@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

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'