java获取网络图片上传到OSS的方法

OSS不支持通过一个网络地址来上传图片，所以若想将网络上的图片上传到OSS上需要走点弯路。

1、通过链接将图片下载到本地的一个文件夹下面

2、用OSS上传该文件夹下的文件

3、上传完成后删除本地的文件

具体代码如下：

//获取当前项目的绝对路径
public static String getTomcatPath(){
 String nowpath;  
 String tempdir;
 nowpath=System.getProperty("user.dir");
 tempdir=nowpath.replace("bin", ""); //把bin 文件夹变到 webapps文件里面
 return tempdir;
}
/**
* 将图片下载下来后，上传到OSS
* @param imgLink
* @param downloadPath
* @return
* @throws Exception
*/
private String downloadImagAndUploadToOss(String imgLink,String downloadPath) throws Exception{
 List<String> urlList=new ArrayList<String>();
 urlList.add(imgLink);
 String imgName=DateUtil.formatDate(new Date(), "yyyyMMddhhmmss")+UuidUtil.createUUID()+".jpg";
 downloadPicture(urlList,downloadPath,imgName);
String key="carAlbum/"+imgName;
String imgUrl=OSSObjectAPI.genOssPicUrl(OSSObjectAPI.XI_AN_BUCKET_NAME,OSSObjectAPI.XIAN_ACCESS_ID,OSSObjectAPI.XIAN_ACCESS_KEY,
 "http://oss-cn-zhangjiakou.aliyuncs.com/",downloadPath+imgName,key);
FileUtil.delete(downloadPath+imgName);
return imgUrl;
}
/**
 * 传入要下载的图片的url列表，将url所对应的图片下载到本地
 * @param urlList
 * @throws Exception
 */
private void downloadPicture(List<String> urlList,String path,String imgName) throws Exception {
 if(urlList==null||urlList.size()==0){
  return;
 }
 URL url = null;
 FileOutputStream fileOutputStream =null;
 InputStream inputStream =null;
 for (String urlString : urlList) {
  try {
    url = new URL(urlString);
    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
    connection.addRequestProperty("User-Agent","Mozilla/5.0 (Windows NT 6.1; WOW64; rv:55.0) Gecko/20100101 Firefox/55.0");
    connection.setConnectTimeout(10 * 1000);
    connection.setReadTimeout(15 * 1000);
    inputStream = connection.getInputStream();
    byte[] buffer = new byte[1024];
    int length;
    fileOutputStream= new FileOutputStream(path+ File.separator+ imgName);
    while ((length = inputStream.read(buffer)) != -1) {
     fileOutputStream.write(buffer, 0, length);
    }
  } catch (Exception e) {
   e.printStackTrace();
  } finally{
   inputStream.close();
   fileOutputStream.flush();
   fileOutputStream.close();
  }
 }

}

来源：https://blog.csdn.net/qq_33556185/article/details/79152679