aliyun oss操作汇总

STS介绍

阿里云STS (Security Token Service) 是为阿里云账号（或RAM用户）提供短期访问权限管理的云服务。通过STS，您可以为联盟用户（您的本地账号系统所管理的用户）颁发一个自定义时效和访问权限的访问凭证。联盟用户可以使用STS短期访问凭证直接调用阿里云服务API，或登录阿里云管理控制台操作被授权访问的资源。

访问点

STS的默认访问点地址是: https://sts.aliyuncs.com ，用户必须使用https接入访问点。

术语表

术语	中文	说明
Federated identity	联盟用户身份	联盟用户的身份认证由客户自己管理
Policy	访问策略	用来描述授权策略的一种描述语言
Grantor	授权者	授权令牌的颁发者(云账号或RAM用户)
Name	被授权者	授权令牌的使用者(即联盟用户)

https://help.aliyun.com/document_detail/28756.html?spm=a2c4g.11186623.2.9.4d4f412fzjwgui#reference-ong-5nv-xdb

授权访问

使用STS进行临时授权

OSS可以通过阿里云STS (Security Token Service) 进行临时授权访问。阿里云STS是为云计算用户提供临时访问令牌的Web服务。通过STS，您可以为第三方应用或子用户（即用户身份由您自己管理的用户）颁发一个自定义时效和权限的访问凭证。STS更详细的解释请参见STS介绍。

STS的优势如下：

• 您无需透露您的长期密钥（AccessKey）给第三方应用，只需生成一个访问令牌并将令牌交给第三方应用。您可以自定义这个令牌的访问权限及有效期限。
• 您无需关心权限撤销问题，访问令牌过期后自动失效。

使用STS访问OSS的流程请参见开发指南中的RAM和STS应用场景实践。

使用签名URL上传文件

以下代码用于使用签名URL上传文件：

// Endpoint以杭州为例，其它Region请按实际情况填写。
String endpoint = "http://oss-cn-hangzhou.aliyuncs.com";
// 阿里云主账号AccessKey拥有所有API的访问权限，风险很高。强烈建议您创建并使用RAM账号进行API访问或日常运维，请登录 https://ram.console.aliyun.com 创建RAM账号。
String accessKeyId = "<yourAccessKeyId>";
String accessKeySecret = "<yourAccessKeySecret>";
String bucketName = "<yourBucketName>";
String objectName = "<yourObjectName>";

// 创建OSSClient实例。
OSSClient ossClient  = new OSSClient(endpoint, accessKeyId, accessKeySecret);

// 生成签名URL。
Date expiration = DateUtil.parseRfc822Date("Thu, 19 Mar 2019 18:00:00 GMT");
GeneratePresignedUrlRequest request = new GeneratePresignedUrlRequest(bucketName, objectName, HttpMethod.PUT);
// 设置过期时间。
request.setExpiration(expiration);
// 设置Content-Type。
request.setContentType("application/octet-stream");
// 添加用户自定义元信息。
request.addUserMetadata("author", "aliy");
// 生成签名URL（HTTP PUT请求）。
URL signedUrl = ossClient.generatePresignedUrl(request);
System.out.println("signed url for putObject: " + signedUrl);

// 使用签名URL发送请求。
File f = new File("<yourLocalFile>");
FileInputStream fin = new FileInputStream(f);
// 添加PutObject请求头。
Map<String, String> customHeaders = new HashMap<String, String>();
customHeaders.put("Content-Type", "application/octet-stream");
customHeaders.put("x-oss-meta-author", "aliy");

PutObjectResult result = ossClient.putObject(signedUrl, fin, f.length(), customHeaders);

// 关闭OSSClient。
ossClient.shutdown();

 https://help.aliyun.com/document_detail/32016.html

错误码大全
https://error-center.aliyun.com/status/product/Oss

// endpoint以杭州为例，其它region请按实际情况填写
String endpoint = "http://oss-cn-hangzhou.aliyuncs.com";
// accessKey请登录https://ak-console.aliyun.com/#/查看
String accessKeyId = "<yourAccessKeyId>";
String accessKeySecret = "<yourAccessKeySecret>";
String content = "Hello OSS";
// 创建OSSClient实例
OSSClient ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecret);
AppendObjectRequest appendObjectRequest = new AppendObjectRequest("<yourBucketName>", 
        "<yourKey>", new ByteArrayInputStream(content.getBytes()));
// 第一次追加
appendObjectRequest.setPosition(0L);
AppendObjectResult appendObjectResult = ossClient.appendObject(appendObjectRequest);
// 第二次追加
appendObjectRequest.setPosition(appendObjectResult.getNextPosition());
appendObjectResult = ossClient.appendObject(appendObjectRequest);
// 第三次追加
appendObjectRequest.setPosition(appendObjectResult.getNextPosition());
appendObjectResult = ossClient.appendObject(appendObjectRequest);
// 关闭client
ossClient.shutdown();

https://help.aliyun.com/document_detail/32013.html

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;

import com.aliyun.oss.ClientException;
import com.aliyun.oss.OSSClient;
import com.aliyun.oss.OSSException;
import com.aliyun.oss.model.AppendObjectRequest;
import com.aliyun.oss.model.AppendObjectResult;
import com.aliyun.oss.model.OSSObject;

/**
 * This sample demonstrates how to upload an object by append mode 
 * to Aliyun OSS using the OSS SDK for Java.
 */
public class AppendObjectSample {
    
    private static String endpoint = "*** Provide OSS endpoint ***";
    private static String accessKeyId = "*** Provide your AccessKeyId ***";
    private static String accessKeySecret = "*** Provide your AccessKeySecret ***";
    
    private static String bucketName = "*** Provide bucket name ***";
    private static String key = "*** Provide key ***";
    
    public static void main(String[] args) throws IOException {        
        /*
         * Constructs a client instance with your account for accessing OSS
         */
        OSSClient client = new OSSClient(endpoint, accessKeyId, accessKeySecret);
        
        try {            
            /*
             * Append an object from specfied input stream, keep in mind that
             * position should be set to zero at first time.
             */
            String content = "Thank you for using Aliyun Object Storage Service";
            InputStream instream = new ByteArrayInputStream(content.getBytes());
            Long firstPosition = 0L;
            System.out.println("Begin to append object at position(" + firstPosition + ")");
            AppendObjectResult appendObjectResult = client.appendObject(
                    new AppendObjectRequest(bucketName, key, instream).withPosition(0L));
            System.out.println("	Next position=" + appendObjectResult.getNextPosition() + 
                    ", CRC64=" + appendObjectResult.getObjectCRC() + "
");
            
            /*
             * Continue to append the object from specfied file descriptor at last position
             */
            Long nextPosition = appendObjectResult.getNextPosition();
            System.out.println("Continue to append object at last position(" + nextPosition + "):");
            appendObjectResult = client.appendObject(
                    new AppendObjectRequest(bucketName, key, createTempFile())
                    .withPosition(nextPosition));
            System.out.println("	Next position=" + appendObjectResult.getNextPosition() + 
                    ", CRC64=" + appendObjectResult.getObjectCRC());
            
            /*
             * View object type of the appendable object
             */
            OSSObject object = client.getObject(bucketName, key);
            System.out.println("	Object type=" + object.getObjectMetadata().getObjectType() + "
");
            // Do not forget to close object input stream if not use it any more
            object.getObjectContent().close();
            
            /*
             * Delete the appendable object
             */
            System.out.println("Deleting an appendable object");
            client.deleteObject(bucketName, key);
            
        } catch (OSSException oe) {
            System.out.println("Caught an OSSException, which means your request made it to OSS, "
                    + "but was rejected with an error response for some reason.");
            System.out.println("Error Message: " + oe.getErrorCode());
            System.out.println("Error Code:       " + oe.getErrorCode());
            System.out.println("Request ID:      " + oe.getRequestId());
            System.out.println("Host ID:           " + oe.getHostId());
        } catch (ClientException ce) {
            System.out.println("Caught an ClientException, which means the client encountered "
                    + "a serious internal problem while trying to communicate with OSS, "
                    + "such as not being able to access the network.");
            System.out.println("Error Message: " + ce.getMessage());
        } finally {
            /*
             * Do not forget to shut down the client finally to release all allocated resources.
             */
            client.shutdown();
        }
    }
    
    private static File createTempFile() throws IOException {
        File file = File.createTempFile("oss-java-sdk-", ".txt");
        file.deleteOnExit();

        Writer writer = new OutputStreamWriter(new FileOutputStream(file));
        writer.write("abcdefghijklmnopqrstuvwxyz
");
        writer.write("0123456789011234567890
");
        writer.close();

        return file;
    }
}

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package samples;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Writer;

import com.aliyun.oss.ClientException;
import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.OSSException;
import com.aliyun.oss.model.GetObjectRequest;
import com.aliyun.oss.model.OSSObject;
import com.aliyun.oss.model.PutObjectRequest;

/**
 * This sample demonstrates how to upload/download an object to/from 
 * Aliyun OSS using the OSS SDK for Java.
 */
public class SimpleGetObjectSample {
    
    private static String endpoint = "*** Provide OSS endpoint ***";
    private static String accessKeyId = "*** Provide your AccessKeyId ***";
    private static String accessKeySecret = "*** Provide your AccessKeySecret ***";
    
    private static String bucketName = "*** Provide bucket name ***";
    private static String key = "*** Provide key ***";
    
    public static void main(String[] args) throws IOException {
        /*
         * Constructs a client instance with your account for accessing OSS
         */
        OSS client = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);
        
        try {
            
            /**
             * Note that there are two ways of uploading an object to your bucket, the one 
             * by specifying an input stream as content source, the other by specifying a file.
             */
            
            /*
             * Upload an object to your bucket from an input stream
             */
            System.out.println("Uploading a new object to OSS from an input stream
");
            String content = "Thank you for using Aliyun Object Storage Service";
            client.putObject(bucketName, key, new ByteArrayInputStream(content.getBytes()));
            
            /*
             * Upload an object to your bucket from a file
             */
            System.out.println("Uploading a new object to OSS from a file
");
            client.putObject(new PutObjectRequest(bucketName, key, createSampleFile()));
            
            /*
             * Download an object from your bucket
             */
            System.out.println("Downloading an object");
            OSSObject object = client.getObject(new GetObjectRequest(bucketName, key));
            System.out.println("Content-Type: "  + object.getObjectMetadata().getContentType());
            displayTextInputStream(object.getObjectContent());
            
        } catch (OSSException oe) {
            System.out.println("Caught an OSSException, which means your request made it to OSS, "
                    + "but was rejected with an error response for some reason.");
            System.out.println("Error Message: " + oe.getErrorCode());
            System.out.println("Error Code:       " + oe.getErrorCode());
            System.out.println("Request ID:      " + oe.getRequestId());
            System.out.println("Host ID:           " + oe.getHostId());
        } catch (ClientException ce) {
            System.out.println("Caught an ClientException, which means the client encountered "
                    + "a serious internal problem while trying to communicate with OSS, "
                    + "such as not being able to access the network.");
            System.out.println("Error Message: " + ce.getMessage());
        } finally {
            /*
             * Do not forget to shut down the client finally to release all allocated resources.
             */
            client.shutdown();
        }
    }
    
    private static File createSampleFile() throws IOException {
        File file = File.createTempFile("oss-java-sdk-", ".txt");
        file.deleteOnExit();

        Writer writer = new OutputStreamWriter(new FileOutputStream(file));
        writer.write("abcdefghijklmnopqrstuvwxyz
");
        writer.write("0123456789011234567890
");
        writer.close();

        return file;
    }

    private static void displayTextInputStream(InputStream input) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(input));
        while (true) {
            String line = reader.readLine();
            if (line == null) break;

            System.out.println("	" + line);
        }
        System.out.println();

        reader.close();
    }
    
}

https://github.com/aliyun/aliyun-oss-java-sdk/blob/master/src/samples/SimpleGetObjectSample.java?spm=5176.12026607.tutorial.1.9c7732e2bQ2hBA&file=SimpleGetObjectSample.java

https://help.aliyun.com/document_detail/84781.html?spm=a2c4g.11186623.6.662.2cb51000luQAlv

https://segmentfault.com/a/1190000017273629?utm_source=tag-newest

在OSS控制台设置了CORS规则以后，通过JS程序去调用的时候报No ‘Access-Control-Allow-Origin’ header is present on the requested resource，可以通过下面的思路来进行下排查：

1. 确认检查CORS规则是否设置好了，是否设置正确，正确的设置方法如下图：

 

2. CORS设置都正确的话，那就检查AllowedHeader的设置，一般建议设置为*，设置方法如下： 

https://help.aliyun.com/knowledge_detail/39518.html

参数	是否必须	说明
来源	是	指定允许的跨域请求的来源。允许多条匹配规则，多条规则需换行填写。每条匹配规则允许使用最多一个星号（*）通配符。单独填写星号（*）通配符，表示允许所有来源的跨域请求。
允许 Methods	是	指定允许的跨域请求方法。
允许 Headers	否	指定允许的跨域请求的响应头。大小写不敏感，允许多条匹配规则，多条规则需换行填写。每条匹配规则最多使用一个星号（*）通配符。建议没有特殊需求的情况下设置为星号（*）。
暴露 Headers	否	指定允许用户从应用程序中访问的响应头（例如，一个Javascript 的 XMLHttpRequest对象）。不允许使用星号（*）通配符。
缓存时间	否	指定浏览器对特定资源的预取（OPTIONS）请求返回结果的缓存时间。

 

说明 每个存储空间最多可以配置10条规则。

https://help.aliyun.com/document_detail/31903.html?spm=a2c4g.11186623.2.14.5c73c451QhufyK#concept-pbw-4df-vdb

设置跨域访问

跨域访问，或者说JavaScript的跨域访问问题，是浏览器出于安全考虑而设置的一个限制，即同源策略。当来自于A网站的页面中的JavaScript代码希望访问B网站的时候，浏览器会拒绝该访问，因为A、B两个网站是属于不同的域。

在实际应用中，经常会有跨域访问的需求，比如用户的网站www.a.com，后端使用了OSS。在网页中提供了使用JavaScript实现的上传功能，但是在该页面中，只能向www.a.com发送请求，向其他网站发送的请求都会被浏览器拒绝。这样就导致用户上传的数据必须从www.a.com中转。如果设置了跨域访问的话，用户就可以直接上传到OSS而无需从www.a.com中转。

跨域资源共享的实现

跨域资源共享（Cross-Origin Resource Sharing），简称CORS，是HTML5提供的标准跨域解决方案，OSS支持CORS标准来实现跨域访问。具体的CORS规则可以参考W3C CORS规范。其实现如下：

1. CORS通过HTTP请求中附带Origin的Header来表明自己来源域，比如上面那个例子，Origin的Header就是www.a.com。
2. 服务器端接收到这个请求之后，会根据一定的规则判断是否允许该来源域的请求。如果允许，服务器在返回的响应中会附带上Access-Control-Allow-Origin这个Header，内容为www.a.com来表示允许该次跨域访问。如果服务器允许所有的跨域请求，将Access-Control-Allow-Origin的Header设置为*即可。
3. 浏览器根据是否返回了对应的Header来决定该跨域请求是否成功，如果没有附加对应的Header，浏览器将会拦截该请求。如果是非简单请求，浏览器会先发送一个OPTIONS请求来获取服务器的CORS配置，如果服务器不支持接下来的操作，浏览器也会拦截接下来的请求。

OSS提供了CORS规则的配置，从而根据需求允许或者拒绝相应的跨域请求。该规则是配置在Bucket级别的。详情可以参考PutBucketCORS。

细节分析

• CORS相关的Header附加等都是浏览器自动完成的，用户不需要有任何额外的操作。CORS操作也只在浏览器环境下有意义。
• CORS请求的通过与否和OSS的身份验证是完全独立的，即OSS的CORS规则仅仅是用来决定是否附加CORS相关的Header的一个规则。是否拦截该请求完全由浏览器决定。
• 使用跨域请求的时候需要关注浏览器是否开启了Cache功能。当运行在同一个浏览器上分别来源于www.a.com和www.b.com的两个页面都同时请求同一个跨域资源的时候，如果www.a.com的请求先到达服务器，服务器将资源带上Access-Control-Allow-Origin的Header为www.a.com返回给用户。这个时候www.b.com又发起了请求，浏览器会将Cache的上一次请求返回给用户，此时Header的内容和CORS的要求不匹配，就会导致后面的请求失败。

https://help.aliyun.com/document_detail/31870.html?spm=a2c4g.11186623.2.10.7ecc6a68CpGZAQ#concept-bwn-tjd-5db

本文介绍如何进行跨域资源共享。

跨域资源共享（Cross-origin resource sharing，简称CORS）允许Web端的应用程序访问不属于本域的资源。OSS提供跨域资源共享接口，方便您控制跨域访问的权限。

更多关于跨域资源共享的介绍，请参见开发指南中的设置跨域访问和API参考中PutBucketcors。

// Endpoint以杭州为例，其它Region请按实际情况填写。
String endpoint = "http://oss-cn-hangzhou.aliyuncs.com";
// 阿里云主账号AccessKey拥有所有API的访问权限，风险很高。强烈建议您创建并使用RAM账号进行API访问或日常运维，请登录 https://ram.console.aliyun.com 创建RAM账号
String accessKeyId = "<yourAccessKeyId>";
String accessKeySecret = "<yourAccessKeySecret>";
String bucketName = "<yourBucketName>";

// 创建OSSClient实例。
OSSClient ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecret);

SetBucketCORSRequest request = new SetBucketCORSRequest(bucketName);

// 跨域资源共享规则的容器，每个存储空间最多允许10条规则。
ArrayList<CORSRule> putCorsRules = new ArrayList<CORSRule>();

CORSRule corRule = new CORSRule();

ArrayList<String> allowedOrigin = new ArrayList<String>();
// 指定允许跨域请求的来源。
allowedOrigin.add( "http://www.b.com");

ArrayList<String> allowedMethod = new ArrayList<String>();
// 指定允许的跨域请求方法(GET/PUT/DELETE/POST/HEAD)。
allowedMethod.add("GET");

ArrayList<String> allowedHeader = new ArrayList<String>();
// 是否允许预取指令（OPTIONS）中Access-Control-Request-Headers头中指定的Header。
allowedHeader.add("x-oss-test");

ArrayList<String> exposedHeader = new ArrayList<String>();
// 指定允许用户从应用程序中访问的响应头。
exposedHeader.add("x-oss-test1");
// AllowedOrigins和AllowedMethods最多支持一个星号（*）通配符。星号（*）表示允许所有的域来源或者操作。
corRule.setAllowedMethods(allowedMethod);
corRule.setAllowedOrigins(allowedOrigin);
// AllowedHeaders和ExposeHeaders不支持通配符。
corRule.setAllowedHeaders(allowedHeader);
corRule.setExposeHeaders(exposedHeader);
// 指定浏览器对特定资源的预取（OPTIONS）请求返回结果的缓存时间，单位为秒。
corRule.setMaxAgeSeconds(10);

// 最多允许10条规则。
putCorsRules.add(corRule);
// 已存在的规则将被覆盖。
request.setCorsRules(putCorsRules);
ossClient.setBucketCORS(request);

// 关闭OSSClient。
ossClient.shutdown();

https://help.aliyun.com/document_detail/32018.html?spm=a2c4g.11186623.6.690.676f2eaaWRN8fZ

获取跨域资源共享规则

以下代码用于获取跨域资源共享规则：

// Endpoint以杭州为例，其它Region请按实际情况填写。
String endpoint = "http://oss-cn-hangzhou.aliyuncs.com";
// 阿里云主账号AccessKey拥有所有API的访问权限，风险很高。强烈建议您创建并使用RAM账号进行API访问或日常运维，请登录 https://ram.console.aliyun.com 创建RAM账号。
String accessKeyId = "<yourAccessKeyId>";
String accessKeySecret = "<yourAccessKeySecret>";
String bucketName = "<yourBucketName>";

// 创建OSSClient实例。
OSSClient ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecret);

ArrayList<CORSRule> corsRules;
// 获取跨域资源共享规则列表。
corsRules =  (ArrayList<CORSRule>) ossClient.getBucketCORSRules(bucketName);
for (CORSRule rule : corsRules) {
    for (String allowedOrigin1 : rule.getAllowedOrigins()) {
        // 获取允许的跨域请求源。
        System.out.println(allowedOrigin1);
    }

    for (String allowedMethod1 : rule.getAllowedMethods()) {
        // 获取允许的跨域请求方法。
        System.out.println(allowedMethod1);
    }

    if (rule.getAllowedHeaders().size() > 0){
        for (String allowedHeader1 : rule.getAllowedHeaders()) {
            // 获取允许的头部列表。
            System.out.println(allowedHeader1);
        }
    }

    if (rule.getExposeHeaders().size() > 0) {
        for (String exposeHeader : rule.getExposeHeaders()) {
            // 获取允许的头部。
            System.out.println(exposeHeader);
        }
    }

    if ( null != rule.getMaxAgeSeconds()) {
        System.out.println(rule.getMaxAgeSeconds());
    }
}

// 关闭OSSClient。
ossClient.shutdown();

https://help.aliyun.com/document_detail/32018.html?spm=a2c4g.11186623.6.690.676f2eaaWRN8fZ

签名错误 （signature not match）

签名错误建议您排查以下问题：

• 参考在Header中包含签名中的签名方法以及示例，切记其中的 是不能少的。

• URL中出现特殊字符“+”等时，会有浏览器无法识别的情况，需要对签名做url coding，对“+”等做url编码，将+转换为“%2b”，浏览器才能识别。

• 使用如下的签名验证工具自行查看签名的过程，请您参考：https://bbs.aliyun.com/read/233851.html

推荐直接使用我们提供的SDK，这样避免您自己进行签名，我们帮您直接实现了签名的过程，请您参考：这里。

https://help.aliyun.com/knowledge_detail/66098.html?spm=a2c4g.11186631.2.8.6e892a8dwb2Hk5

java实现生成url签名的代码示例

生成签名以后的URL的示例代码如下：

// Generate a presigned URL

Date expires = new Date (new Date().getTime() + 1000 * 60); // 1 minute to expire

GeneratePresignedUrlRequest generatePresignedUrlRequest =

new GeneratePresignedUrlRequest(bucketName, key);

generatePresignedUrlRequest.setExpiration(expires);

URL url = client.generatePresignedUrl(generatePresignedUrlRequest);

System.out.println(url.toString());

这段代码假定指定bucketName和key的Object已经上传到OSS，用户可以根据修改设定expires，即过期时间。更详细的操作可以参考OSSClient#generatePresignedUrl方法和GeneratePresignedUrlRequest类的帮助。

 详细Java SDK文档可以参考：点击查看

https://help.aliyun.com/knowledge_list/51639.html?spm=a2c4g.11186623.3.3.697c7681h465JK

@Slf4j
@Service
public class AliOSSServiceImpl implements OSSService {

    @Autowired
    private OssConfig ossConfig;

    @Override
    public UploadOSSVO generatePresignedUrl(UploadOSSReq req) {
        String bucketName = ossConfig.getBucket();
        OSSClient ossClient = null;
        try {
            ossClient = getOssClient();
            // 设置文件路径和名称
            // https://filetest.gongbangbang.com/resources/u/2019/02/11/ea05ef6c4fce4e04a910fb38a2643a1fBJxmpf.jpg
            String key = getObjectName(req);
            // 创建请求。
            GeneratePresignedUrlRequest generatePresignedUrlRequest = new GeneratePresignedUrlRequest(bucketName, key);
            // HttpMethod为PUT。
        generatePresignedUrlRequest.setMethod(HttpMethod.PUT);//要使用put方法进行上传
//            // 添加用户自定义元信息。
            generatePresignedUrlRequest.addUserMetadata("author", "jackie");
            // 添加Content-Type。
        generatePresignedUrlRequest.setContentType("application/octet-stream");//要指定HttpHeader
            // 设置URL过期时间为1小时。
            generatePresignedUrlRequest.setExpiration(LocalDateTime.now().plusHours(1).toDate());
            // 上传文件
            URL url = ossClient.generatePresignedUrl(generatePresignedUrlRequest);
            String query = url.getQuery();
            return new UploadOSSVO(ossConfig.getOssResourceUrl(key) + "?" + query);
        } catch (OSSException oe) {
            log.error("生成url失败 OSSException {}", oe.getMessage(), oe);
            throw oe;
        } catch (ClientException ce) {
            log.error("生成url失败 ClientException {}", ce.getErrorMessage());
            throw ce;
        } finally {
            if (ossClient != null) {
                ossClient.shutdown();
            }
        }
    }


    /**
     * 上传文件。
     *
     * @param file 需要上传的文件路径
     * @return 如果上传的文件是图片的话，会返回图片的"URL"，如果非图片的话会返回"非图片，不可预览。文件路径为：+文件路径"
     */
    @Override
    public String upLoad(File file) throws IOException {
        log.info("------OSS文件上传开始--------{}", file.getName());
        Assert.notNull(file, "往ali oss 上传的文件为空");
        Assert.isTrue(file.exists(), "往ali oss上传的文件不存在");
        String bucketName = ossConfig.getBucket();
        OSSClient ossClient = null;
        try {
            ossClient = getOssClient();
            // 设置文件路径和名称
            // https://filetest.gongbangbang.com/resources/u/2019/02/11/ea05ef6c4fce4e04a910fb38a2643a1fBJxmpf.jpg
            String key = getObjectName(new UploadOSSReq(FilenameUtils.getExtension(file.getName())));
            // 上传文件
            PutObjectResult putObjectResult = ossClient.putObject(bucketName, key, file);
            String ossResourceUrl = ossConfig.getOssResourceUrl(key);
            if (putObjectResult != null) {
                log.info("PutObjectResult:{}", JSON.toJSONString(putObjectResult));
                // 设置权限(公开读)
                ossClient.setObjectAcl(bucketName, key, CannedAccessControlList.PublicRead);
                log.info("------OSS文件上传成功------ {}", ossResourceUrl);
                FileUtils.deleteQuietly(file);
                return ossResourceUrl;
            }
            log.warn("OSS文件上传失败。 putObjectResult is null");
            throw new IOException("OSS文件上传失败。putObjectResult is null");
        } catch (OSSException oe) {
            log.error(oe.getMessage(), oe);
            throw oe;
        } catch (ClientException ce) {
            log.error(ce.getErrorMessage(), ce);
            throw ce;
        } finally {
            if (ossClient != null) {
                ossClient.shutdown();
            }
        }
    }


    /**
     * 上传的资源在OSS上的路径
     *
     * @param req
     * @return
     */
    private String getObjectName(UploadOSSReq req) {
        return ossConfig.getPath() + LocalDate.now().toString("yyyy/MM/dd") + "/" + RandomUtils.getRandomFileName() + req.getSuffix();
    }

    /**
     * 初始化OSS Client对象
     *
     * @return
     */
    private OSSClient getOssClient() {
        OSSClient ossClient = new OSSClient(ossConfig.getEndpoint(), ossConfig.getAccessId(), ossConfig.getAccessKey());
        // 判断容器是否存在,不存在就创建
        String bucketName = ossConfig.getBucket();
        if (!ossClient.doesBucketExist(bucketName)) {
            ossClient.createBucket(bucketName);
            CreateBucketRequest createBucketRequest = new CreateBucketRequest(bucketName);
            createBucketRequest.setCannedACL(CannedAccessControlList.PublicRead);
            ossClient.createBucket(createBucketRequest);
        }
        return ossClient;
    }
}