腾讯云java web项目页面上传图片保存到对象存储(COS)中、获取上传到COS的图片的url
因为项目中保存一个对象的时候有几个图片字段，现在需要把上传的图片保存到COS上，然后数据库保存图片路径。
在看官方文档的时候，上面的图片上传是通过给出图片具体的绝对路径或相对路径。但是现在是通过页面选择图片然后进行上传。
我使用的是springmvc，form提交过来后传递的是MultipartFile对象，想过把MultipartFile转为file，或者上传图片的时候获取图片本地绝对位置，这两种思路都出现了一些问题没有成功。经过一番百度后，找到一片帖子非常适合解决我现在的问题。
引入依赖：
com.qcloud
cos_api
5.4.4
commons-codec
commons-codec
1.10
然后建立一个工具类：这个类定义好了通过MultipartFile对象上传图片，然后返回图片的url的方法，对我来说写的非常完整。
package com.thinkgem.jeesite.modules.education.utils;
import com.qcloud.cos.COSClient;
import com.qcloud.cos.ClientConfig;
import com.qcloud.cos.auth.BasicCOSCredentials;
import com.qcloud.cos.auth.COSCredentials;
import com.qcloud.cos.model.ObjectMetadata;
import com.qcloud.cos.model.PutObjectResult;
import com.qcloud.cos.region.Region;
import org.springframework.web.multipart.MultipartFile;
import java.io.*;
import java.net.URL;
import java.util.Date;
import java.util.Random;
public class COSClientUtil {
//todo 这些变量信息自行到 腾讯云对象存储控制台 获取
// 存储通名称 替换成自己的
private static final String bucketName = "name-xxxxxxxxxx";
//secretId 替换成自己的
private static final String secretId = "xxxxxx";
// secretKey 替换成自己的
private static final String secretKey = "xxxx";
// 1 初始化用户身份信息(secretId, secretKey)
private static final COSCredentials cred = new BasicCOSCredentials(secretId, secretKey);
// 2 设置bucket的区域, COS地域的简称请参照 https://cloud.tencent.com/document/product/436/6224
private static final ClientConfig clientConfig = new ClientConfig(new Region("ap-chengdu"));
// 3 生成cos客户端
private static final COSClient cosClient = new COSClient(cred, clientConfig);
// 文件存储目录
//private String filedir = "blog/";
private COSClient cOSClient;
public COSClientUtil() {
cOSClient = new COSClient(cred, clientConfig);
}
/**
* 销毁
*/
public void destory() {
cOSClient.shutdown();
}
/**
* 上传图片
*
* @param url
*/
public void uploadImg2Cos(String url) throws Exception {
File fileOnServer = new File(url);
FileInputStream fin;
try {
fin = new FileInputStream(fileOnServer);
String[] split = url.split("/");
this.uploadFile2Cos(fin, split[split.length - 1]);
} catch (FileNotFoundException e) {
throw new Exception("图片上传失败");
}
}
public String uploadFile2Cos(MultipartFile file) throws Exception {
if (file.getSize() > 10 * 1024 * 1024) {
throw new Exception("上传图片大小不能超过10M！");
}
String originalFilename = file.getOriginalFilename(); //demo.jpg
String substring = originalFilename.substring(originalFilename.lastIndexOf(".")).toLowerCase(); //.jpg
Random random = new Random();
String name = random.nextInt(10000) + System.currentTimeMillis() + substring;
try {
InputStream inputStream = file.getInputStream();
this.uploadFile2Cos(inputStream, name);
return name;
} catch (Exception e) {
throw new Exception("图片上传失败");
}
}
/**
* 获得图片路径
*
* @param fileUrl
* @return
*/
public String getImgUrl(String fileUrl) {
return getUrl(fileUrl);
}
/**
* 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(System.currentTimeMillis() + 3600L * 1000 * 24 * 365 * 10);
// 生成URL
URL url = cosClient.generatePresignedUrl(bucketName, key, expiration);
if (url != null) {
return url.toString();
}
return null;
}
/**
* 上传到COS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 uploadFile2Cos(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 = cOSClient.putObject(bucketName, fileName, instream, objectMetadata);
ret = putResult.getETag();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (instream != null) {
instream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return ret;
}
/**
* Description: 判断Cos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";
}
}页面上传图片部分代码：这里记得给form加enctype="multipart/form-data"属性
controller层：
@RequiresPermissions("education:czywC2Educator:edit")
@RequestMapping(value = "save")
public String save(CzywC2Educator czywC2Educator,MultipartFile file,MultipartFile file1, MultipartFile file2, Model model, RedirectAttributes redirectAttributes) throws Exception {
if (!beanValidator(model, czywC2Educator)){
return form(czywC2Educator, model);
}
czywC2EducatorService.save(czywC2Educator);
if (file != null && file.getSize()>0 ) {
czywC2Educator.setImgIdcard(uploadMethod(file));
czywC2EducatorService.save(czywC2Educator);
}
if (file1 != null && file1.getSize()>0) {
czywC2Educator.setImgDiploma(uploadMethod(file1));
czywC2EducatorService.save(czywC2Educator);
}
if (file2 != null && file2.getSize()>0) {
czywC2Educator.setImgQualiCert(uploadMethod(file2));
czywC2EducatorService.save(czywC2Educator);
}
addMessage(redirectAttributes, "保存xxx成功");
return "redirect:"+Global.getAdminPath()+"/education/czywC2Educator/list?repage";
}
public String uploadMethod(MultipartFile file) throws Exception {
COSClientUtil cosClientUtil = new COSClientUtil();
String name = cosClientUtil.uploadFile2Cos(file);
String imgUrl = cosClientUtil.getImgUrl(name);
String[] split = imgUrl.split("\\?");
return split[0];
}ok,问题解决了，开心！！！非常感谢https://blog.csdn.net/zhou870498/article/details/79795391这篇帖子以及贴主。