准备工作
-
准备一个云主机。
云主机不一定要使用阿里云，只是最近疫情期间，阿里云有活动，学生可以免费用6个月，我今早定了闹钟7点50就起来抢这个免费的云主机了 -
开通OSS
使用OSS教程文件 -
创建bucket
编码部分
java中实现上传的教程参考：https://help.aliyun.com/document_detail/32013.html?spm=a2c4g.11186623.2.22.2abb7815PJ5Nce#concept-32013-zh
- 引入依赖
<!--阿里云-->
<dependency>
<groupId>com.aliyun.oss</groupId>
<artifactId>aliyun-sdk-oss</artifactId>
<version>3.8.1</version>
</dependency>
- 必备参数配置
aliyun.bucketName=ju***nity
aliyun.accessKeyId=LT***9hs
aliyun.accessKeySecret=r7c***XF
aliyun.endpoint=http://oss-cn-shenzhen.aliyuncs.com
#目标文件夹
aliyun.filehost=userImg/
- 创建OSS工具类
package com.july.community.provider;
/**
* 阿里云oss服务器工具类
*/
@Component
public class OssUtil {
@Value("${aliyun.endpoint}")
private String endpoint;
@Value("${aliyun.accessKeyId}")
private String accessKeyId;
@Value("${aliyun.accessKeySecret}")
private String accessKeySecret;
@Value("${aliyun.bucketName}")
private String bucketName;
//文件存储目录
@Value("${aliyun.filehost}")
private String filedir;
//上传图片
public String uploadImg20ss(MultipartFile file){
if (file.getSize() > 1024 * 1024 * 20){
throw new CustomizeException(CustomizeErrorCode.IMAGE_TOO_MAX);
}
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.uploadFile20SS(inputStream,name);
return name;
}catch (Exception e){
throw new CustomizeException(CustomizeErrorCode.IMAGE_UPLOAD_FAIL);
}
}
//上传图片获取fileUrl
private String uploadFile20SS(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
// 创建OSSClient实例。
OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);
PutObjectResult putRequest = ossClient.putObject(bucketName,filedir+fileName,instream,objectMetadata);
ret=putRequest.getETag();
} catch (IOException e) {
System.out.println(e.getMessage());
}finally {
try{
if (instream != null){
instream.close();
}
}catch (IOException e){
e.printStackTrace();
}
}
return ret;
}
//
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";
}
//获取图片路径
public String getImgUrl(String fileUrl){
if (!StringUtils.isEmpty(fileUrl)){
String[] split =fileUrl.split("/");
String url=this.getUrl(this.filedir+split[split.length-1]);
return url;
}
return null;
}
//获取url链接
public String getUrl(String key){
//设置Url过期时间为10年
Date expiration =new Date(new Date().getTime() + 36001 * 1000 * 24 * 365 * 10);
//生成URL
OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);
URL url=ossClient.generatePresignedUrl(bucketName,key,expiration);
if (url != null){
return url.toString();
}
return null;
}
//多图上传
public String checkList(List<MultipartFile> fileList){
String fileUrl="";
String str = "";
String photoUrl = "";
for (int i =0;i<fileList.size();i++){
fileUrl = uploadImg20ss(fileList.get(i));
str = getImgUrl(fileUrl);
if (i==0){
photoUrl = str;
}else {
photoUrl+=","+str;
}
}
return photoUrl.trim();
}
//单个图片上传
public String checkImage(MultipartFile file){
String fileUrl = uploadImg20ss(file);
String str = getImgUrl(fileUrl);
return str.trim();
}
}
- FileController
package com.july.community.controller;
@Controller
public class FileController {
@Autowired
private FileService fileService;
@RequestMapping("/file/upload")
@ResponseBody
private FileDTO upload(HttpServletRequest request){
MultipartHttpServletRequest multipartRequest=(MultipartHttpServletRequest) request;
MultipartFile file = multipartRequest.getFile("editormd-image-file");
FileDTO fileDTO = fileService.fileUpload(file);
return fileDTO;
}
}
- FileService
package com.july.community.service;
@Service
public class FileService {
@Autowired
private OssUtil ossUtil;
public FileDTO fileUpload(MultipartFile file) {
if (file == null){
throw new CustomizeException(CustomizeErrorCode.FILE_IS_EMPTY);
}
//上传
String url=ossUtil.checkImage(file);
//获取url
FileDTO fileDTO = new FileDTO();
fileDTO.setUrl(url);
fileDTO.setSuccess(1);
System.out.println(url);
return fileDTO;
}
}
遇坑
- 有一次上传，提示没权限。经过百度，发现，原来要给用户授权