阿里云oss的使用

1.首先第一步我们需要创建Bucket
2.Bucket和外网oss地址
3.创建AccessKey，建议子账户，但我们不走寻常路，直接就是主账户的
4.这是创建好了的，这个可不能泄露
5.上代码
package com.oss;

import com.aliyun.oss.internal.OSSHeaders;
import com.aliyun.oss.model.*;
import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;

import com.aliyun.oss.OSSClient;
import com.aliyun.oss.common.utils.BinaryUtil;
import com.aliyun.oss.common.utils.IOUtils;


import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.lang3.RandomStringUtils;
import org.joda.time.DateTime;
import org.joda.time.LocalDateTime;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.net.URL;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.Objects;

import lombok.extern.slf4j.Slf4j;

/**
 * @author 杨小华
 * @desc 阿里文件云存储管理类
 * @create 2017/11/27 14:25
 **/
@Slf4j
public class OSSClientUtil {
    // 就是刚刚让你创建的AccessKey
    static final String ACCESS_KEY_ID = "这是你的AccessKey ID";
    static final String ACCESS_KEY_SECRET = "这是你的AccessKey Secret";
    /**
     * 用户的存储空间（bucket）名称
     */
    static final String BUCKET_NAME = "bucket名称";
    /**
     * 对应的映射域名
     */
    private static final String ACCESS_URL = "http://www.baidu.com/";
    /**
     * 用户的存储空间所在数据中心的访问域名
     */
    private static final String ENDPOINT = "http://oss-cn-chengdu.aliyuncs.com";
    /**
     * 指定项目文件夹
     */
    private static final String PIC_LOCATION = "gym/";

    /**
     * 加密密钥
     */
    private static final String KEY = "gym";

    private static OSSClient ossClient;

    /**
     * @desc 静态初始化ossClient
     * @author 杨小华
     * @create 2017/11/25 12:44
     **/
    static {
        ossClient = new OSSClient(ENDPOINT, ACCESS_KEY_ID, ACCESS_KEY_SECRET);
    }

    /**
     * @desc 上传自定义格式
     * @author 杨小华
     * @create 2017/11/24 11:09
     **/
    public static String upload(InputStream is, String directory, String fileType) {
        String fileName = getFileName() + "." + fileType;
        return uploadFile(is, directory, fileName);
    }

    /**
     * @desc 上传视频指定mp4格式
     * @author 杨小华
     * @create 2017/11/22 15:00
     **/
    public static String uploadVideo(InputStream is, String directory) {
        String fileName = getFileName() + ".mp4";
        return uploadFile(is, directory, fileName);
    }

    /**
     * @desc 上传图片指定png格式
     * @author 杨小华
     * @create 2017/11/22 14:59
     **/
    public static String uploadImage(InputStream is, String directory) {
        String fileName = getFileName() + ".png";
        return uploadFile(is, directory, fileName);
    }

    /**
     * @desc 上传网络图片指定png格式
     * @author 杨小华
     * @create 2017/11/25 13:37
     **/
    public static String uploadWebImage(String fileUrl, String directory) {
        String fileName = getFileName() + ".png";
        return uploadWebFile(fileUrl, directory, fileName);
    }

    /**
     * @desc 上传本地文件（文件流上传）
     * @author 杨小华
     * @create 2017/11/23 19:57
     **/
    public static String uploadFile(InputStream is, String directory, String fileName) {
        String key = PIC_LOCATION + directory + "/" + fileName;
        if (Objects.isNull(directory)) {
            key = fileName;
        }
        try {
            ObjectMetadata objectMetadata = getObjectMetadata(is.available());
            objectMetadata.setHeader(OSSHeaders.CONTENT_TYPE, "image/png");
            ossClient.putObject(BUCKET_NAME, key, is, objectMetadata);
        } catch (Exception e) {
            log.error(e.getMessage());
            return null;
        } finally {
            IOUtils.safeClose(is);
        }
        return ACCESS_URL + key;
    }

    /**
     * @desc 上传网络图片
     * @author 杨小华
     * @create 2017/11/24 15:43
     **/
    public static String uploadWebFile(String fileUrl, String directory, String fileName) {
        String key = PIC_LOCATION + directory + "/" + fileName;
        InputStream is = null;
        try {
            Integer length = new URL(fileUrl).openConnection().getContentLength();
            is = new URL(fileUrl).openStream();
            ObjectMetadata objectMetadata = getObjectMetadata(length);
            ossClient.putObject(BUCKET_NAME, key, is, objectMetadata);
        } catch (Exception e) {
            log.error(e.getMessage());
            return null;
        } finally {
            IOUtils.safeClose(is);
        }
        return ACCESS_URL + key;
    }

    /**
     * @desc 更新文件:只更新内容，不更新文件名和文件地址。 (因为地址没变，可能存在浏览器原数据缓存，不能及时加载新数据，例如图片更新，请注意)
     * @author 杨小华
     * @create 2017/11/23 20:40
     **/
    public static String updateFile(InputStream is, String fileUrl) {
        String key = getFileNameByUrl(fileUrl);
        return uploadFile(is, null, key);
    }

    /**
     * @desc 替换文件:删除原文件并上传新文件，文件名和地址同时替换 解决原数据缓存问题，只要更新了地址，就能重新加载数据)
     * @author 杨小华
     * @create 2017/11/24 14:19
     **/
    public static String replaceFile(InputStream is, String fileUrl) {
        boolean flag = deleteObject(fileUrl);
        String fileName = getFileNameByUrl(fileUrl);
        if (!flag) {
            return null;
        }
        return uploadFile(is, null, fileName);
    }

    /**
     * @desc 查询文件是否存在
     * @author 杨小华
     * @create 2017/11/24 10:09
     **/
    public static boolean doesObjectExist(String key) {
        boolean result = false;
        try {
            //如果带http,提取key值
            if (key.indexOf("http") != -1) {
                key = getFileNameByUrl(key);
            }
            result = ossClient.doesObjectExist(BUCKET_NAME, key);
        } catch (Exception e) {
            log.error(e.getMessage());
        }
        return result;
    }

    /**
     * @desc 删除Object。 注意：以下所有删除如果文件不存在返回的是true,如果需要先判断是否存在先调用doesObjectExist()方法
     * @author 杨小华
     * @create 2017/11/24 10:06
     **/
    public static boolean deleteObject(String fileUrl) {
        try {
            String key = getFileNameByUrl(fileUrl);
            ossClient.deleteObject(BUCKET_NAME, key);
        } catch (Exception e) {
            log.error(e.getMessage());
            return false;
        }
        return true;
    }

    /**
     * @desc 批量删除object(适用于相同的endpoint和bucketName)
     * @author 杨小华
     * @create 2017/11/24 10:02
     **/
    public static int deleteObjects(List<String> fileUrls) {
        int count = 0;
        List<String> keys = getFileNamesByUrl(fileUrls);
        try {
            // 删除Objects
            DeleteObjectsRequest deleteRequest = new DeleteObjectsRequest(BUCKET_NAME);
            deleteRequest.withKeys(keys);
            count = ossClient.deleteObjects(deleteRequest).getDeletedObjects().size();
        } catch (Exception e) {
            log.error(e.getMessage());
        }
        return count;
    }

    /**
     * @desc 批量文件删除(较慢, 适用于不同endpoint和bucketName)
     * @author 杨小华
     * @create 2017/11/24 13:03
     **/
    public static int deleteBatchObject(List<String> fileUrls) {
        int count = 0;
        for (String url : fileUrls) {
            if (deleteObject(url)) {
                count++;
            }
        }
        return count;
    }

    /**
     * @desc web直传获取签名
     * @author 杨小华
     * @create 2017/9/11 13:01
     **/
    public static Map<String, Object> getWebSign(String callbackUrl, int seconds) {
        Map<String, Object> data = Maps.newHashMap();
        // 存储目录
        String dir = PIC_LOCATION + "web/" + getDirectory();
        //回调内容
        Map<String, String> callback = Maps.newHashMap();
        callback.put("callbackUrl", callbackUrl);
        callback.put("callbackBody", "filename=${object}&size=${size}&mimeType=${mimeType}&height" +
                "=${imageInfo.height}&width=${imageInfo.width}");
        callback.put("callbackBodyType", "application/x-www-form-urlencoded");
        //签名有效期30秒过期
        Date expiration = DateTime.now().plusSeconds(seconds).toDate();
        // 提交节点
        String host = "http://" + BUCKET_NAME + "." + ENDPOINT;
        try {
            PolicyConditions policyConds = new PolicyConditions();
            // 设置上传文件的大小限制
            policyConds.addConditionItem(PolicyConditions.COND_CONTENT_LENGTH_RANGE, 0,
                    1048576000);
            //指定此次上传的文件名必须是dir变量的值开头
            policyConds.addConditionItem(MatchMode.StartWith, PolicyConditions.COND_KEY, dir);
            String postPolicy = ossClient.generatePostPolicy(expiration, policyConds);
            //policy
            String policy = BinaryUtil.toBase64String(postPolicy.getBytes("utf-8"));
            //签名
            String signature = ossClient.calculatePostSignature(postPolicy);
            //回调
            String callbackData = BinaryUtil.toBase64String(callback.toString().getBytes("utf-8"));
            data.put("policy", policy);
            data.put("signature", signature);
            data.put("callback", callbackData);
            data.put("dir", dir);
            data.put("accessKeyId", ACCESS_KEY_ID);
            data.put("accessUrl", ACCESS_URL);
            data.put("host", host);
            data.put("expire", expiration);
        } catch (Exception e) {
            log.error(e.getMessage(), e);
            return null;
        }
        return data;
    }

    /**
     * 移动端临时授权上传
     *
     * @return java.util.Map<java.lang.String,java.lang.Object>
     * @author 杨小华
     * @date 2018/1/29 14:11
     * @since 1.0.0
     */
    /*public static Map<String, Object> getSTSWrite() {
        Map<String, Object> data = Maps.newHashMap();
        // 设置文件目录
        String folder = PIC_LOCATION + "app/" + getDirectory();
        //权限验证
        AssumeRoleResponse.Credentials credentials = STSUtil.createSTSForPutObject(folder);
        Preconditions.checkState(Objects.nonNull(credentials), "权限获取失败，请重试");
        AssumeRoleResponse.Credentials encryptCredentials = DESUtil.encrypt(credentials, KEY);
        //完整文件名
        data.put("oss", encryptCredentials);
        data.put("folder", folder);
        data.put("endpoint", ENDPOINT);
        data.put("buckName", BUCKET_NAME);
        data.put("accessUrl", ACCESS_URL);
        return data;
    }*/

    /**
     * 移动端临时授权下载
     *
     * @return java.util.Map<java.lang.String,java.lang.Object>
     * @author 杨小华
     * @date 2018/1/31 15:33
     * @since 1.0.0
     */
    /*public static Map<String, Object> getSTSRead() {
        Map<String, Object> data = Maps.newHashMap();
        //权限验证
        AssumeRoleResponse.Credentials credentials = STSUtil.createSTSForReadOnly();
        Preconditions.checkState(Objects.nonNull(credentials), "权限获取失败，请重试");
        AssumeRoleResponse.Credentials encryptCredentials = DESUtil.encrypt(credentials, KEY);
        //完整文件名
        data.put("oss", encryptCredentials);
        data.put("endpoint", ENDPOINT);
        data.put("buckName", BUCKET_NAME);
        return data;
    }*/

    /**
     * 私有型bucket，生成签名URL
     *
     * @param key     表情地址，如face/zip/test.zip
     * @param seconds 多少秒后过期
     * @return java.lang.String
     * @author 杨小华
     * @date 2018/2/2 14:32
     * @since 1.0.0
     */
    public static String getSignUrl(String key, int seconds) {
        //如果key值不存在
        Preconditions.checkArgument(doesObjectExist(key), "key值不存在");
        Date expire = DateTime.now().plusSeconds(seconds).toDate();
        GeneratePresignedUrlRequest generatePresignedUrlRequest =
                new GeneratePresignedUrlRequest(BUCKET_NAME, key);
        generatePresignedUrlRequest.setExpiration(expire);
        URL url = ossClient.generatePresignedUrl(generatePresignedUrlRequest);
        return url.toString();
    }


    /**
     * 单个下载文件
     *
     * @param key     文件key值
     * @param fileUrl 目标文件路径名称
     * @return boolean
     * @author 杨小华
     * @date 2018/2/2 18:08
     * @since 1.0.0
     */
    public static boolean getObject(String key, String fileUrl) {
        ObjectMetadata object = ossClient.getObject(new GetObjectRequest(BUCKET_NAME, key), new
                File(fileUrl));
        if (Objects.nonNull(object)) {
            return true;
        }
        return false;
    }

    /**
     * 批量下载文件
     *
     * @param preFix 下载某个文件夹中的所有
     * @param dir    目标目录
     * @return java.lang.String
     * @author 杨小华
     * @date 2018/2/2 17:33
     * @since 1.0.0
     */
    public static String listObject(String preFix, String dir) {
        // 构造ListObjectsRequest请求
        ListObjectsRequest listObjectsRequest = new ListObjectsRequest(BUCKET_NAME);
        //Delimiter 设置为 “/” 时，罗列该文件夹下的文件
        listObjectsRequest.setDelimiter("/");
        //Prefix 设为某个文件夹名，罗列以此 Prefix 开头的文件
        listObjectsRequest.setPrefix(preFix);

        ObjectListing listing = ossClient.listObjects(listObjectsRequest);
        //如果改目录下没有文件返回null
        if (CollectionUtils.isEmpty(listing.getObjectSummaries())) {
            return null;
        }
        // 取第一个目录的key
        File file = new File(dir + listing.getObjectSummaries().get(0).getKey());
        //判断文件所在本地路径是否存在，若无，新建目录
        File fileParent = file.getParentFile();
        if (!fileParent.exists()) {
            fileParent.mkdirs();
        }
        // 遍历所有Object:目录下的文件
        for (OSSObjectSummary objectSummary : listing.getObjectSummaries()) {
            //Bucket中存储文件的路径
            String key = objectSummary.getKey();
            //下载object到文件
            ossClient.getObject(new GetObjectRequest(BUCKET_NAME, key), file);
        }
        return file.getParent();
    }

    /**
     * @desc 生成文件名
     * @author 杨小华
     * @create 2017/11/24 11:15
     **/
    public static String getFileName() {
        return LocalDateTime.now().toString("yyyyMMddHHmmssSSS_") + RandomStringUtils
                .randomNumeric(6);
    }

    /**
     * 生成目录
     *
     * @return java.lang.String
     * @author 杨小华
     * @date 2018/1/29 19:00
     * @since 1.0.0
     */
    public static String getDirectory() {
        return LocalDateTime.now().toString("yyyy-MM-dd");
    }


    /**
     * @desc 根据url获取fileName
     * @author 杨小华
     * @create 2017/11/23 20:40
     **/
    private static String getFileNameByUrl(String fileUrl) {
        int beginIndex = fileUrl.indexOf(ACCESS_URL);
        //针对单个图片处理的图片
        int endIndex = fileUrl.indexOf("?");
        //针对使用模板图片处理的图片
        int endIndex2 = fileUrl.indexOf("@!");
        if (beginIndex == -1) {
            return null;
        }
        if (endIndex != -1) {
            return fileUrl.substring(beginIndex + ACCESS_URL.length(), endIndex);
        }
        if (endIndex2 != -1) {
            return fileUrl.substring(beginIndex + ACCESS_URL.length(), endIndex2);
        }
        return fileUrl.substring(beginIndex + ACCESS_URL.length());
    }

    /**
     * @desc 根据url获取fileNames集合
     * @author 杨小华
     * @create 2017/11/23 20:42
     **/
    private static List<String> getFileNamesByUrl(List<String> fileUrls) {
        List<String> fileNames = Lists.newArrayList();
        for (String url : fileUrls) {
            fileNames.add(getFileNameByUrl(url));
        }
        return fileNames;
    }

    /**
     * @desc ObjectMetaData是用户对该object的描述，
     * 由一系列name-value对组成；其中ContentLength是必须设置的，以便SDK可以正确识别上传Object的大小
     * @author 杨小华
     * @create 2017/11/23 20:12
     **/
    private static ObjectMetadata getObjectMetadata(long length) {
        ObjectMetadata objectMetadata = new ObjectMetadata();
        objectMetadata.setContentLength(length);
        // 被下载时网页的缓存行为
        objectMetadata.setCacheControl("no-cache");
        objectMetadata.setHeader("Pragma", "no-cache");
        return objectMetadata;
    }

    public static void main(String[] args) throws FileNotFoundException {
        File file = new File("C:\\Users\\qian\\Desktop\\Snipaste_2021-06-29_14-28-06.png");
        InputStream is = new FileInputStream(file);
        String result = OSSClientUtil.uploadImage(is, "data");
        System.out.println(result);
    }
}