文章目录

• 前言
• 一、初步阶段
• • 1.1、认识OSS服务与开通OSS服务（创建Bucket、配置用户权限以及允许跨域）
  • 1.2、起步demo：GetStartedSample（上传、删除案例）
• 二、实战系列
• • 2.1、上传文件-简单上传
  • 2.2、集成OSS的SDK包及封装阿里云OSS存储服务（上传、删除功能，含源码）
  • 2.3、集成SpringCloud-Alibaba-OSS
  • • 环境依赖配置
    • 2.3.1、实现普通上传
    • 2.3.2、获取服务端签名（web端来实现上传功能）
• 注意点
• 参考资料

前言

学习文档：

• OSS Java SDK 3.13.2版本—阿里官方文档：可以看其中的起步案例
• 阿里云-OSS对象存储控制台：官方控制台

学习视频：

• Java项目《谷粒商城》Java架构师 | 微服务 | 大型电商项目：对应下面四节有详细开通OSS云服务的讲解以及上传文件普通示例+获取服务端签名通过web端上传

本博客的所有配套代码：aliyun-oss—Gitee、aliyun-oss—Github

所有博客文件目录索引：博客目录索引(持续更新)

一、初步阶段

1.1、认识OSS服务与开通OSS服务（创建Bucket、配置用户权限以及允许跨域）

阿里云开通OSS存储服务可见我的博客：阿里云开通OSS存储服务详细流程

2022.11.11编辑最新流程文档：创建Bucket、配置用户权限以及允许跨域

若是我们仅仅用来自己项目测试的话可以按照下面的来进行创建：

记住要为对应的bucket设置对应的用户权限：对于创建子用户操作见我上面的文章链接跟着走一遍就行！

配置跨域请求：

1.2、起步demo：GetStartedSample（上传、删除案例）

首先来到官方文档：

代码来源：OSS Java SDK 3.13.2版本—阿里官方文档

依赖：

com.aliyun.ossaliyun-sdk-oss3.14.0

代码：已调试其中的带中文注释

package com.changlu.test.common;import java.io.BufferedReader;
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.*;/*** This sample demonstrates how to get started with basic requests to Aliyun OSS * using the OSS SDK for Java.*/
public class GetStartedSample {private static String endpoint = "";private static String accessKeyId = "";private static String accessKeySecret = "";
//    private static String bucketName = "pictured-bed";private static String bucketName = "";private static String key = "test/test2/";//若是目录，一定要设置///方便之后拼接private static String shortEndpoint = "oss-cn-beijing.aliyuncs.com";public static void main(String[] args) throws IOException {/** Constructs a client instance with your account for accessing OSS*/OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);System.out.println("Getting Started with OSS SDK for Java\n");try {//            /*
//             * Determine whether the bucket exists 查看桶是否存在
//             */
//            if (!ossClient.doesBucketExist(bucketName)) {  //创建桶
//                /*
//                 * Create a new OSS bucket
//                 */
//                System.out.println("Creating bucket " + bucketName + "\n");
//                ossClient.createBucket(bucketName);//根据当前的认证信息来进行创建Bucket桶，默认是私有
//                CreateBucketRequest createBucketRequest= new CreateBucketRequest(bucketName);
//                createBucketRequest.setCannedACL(CannedAccessControlList.PublicRead);//设置读写权限为公开读
//                ossClient.createBucket(createBucketRequest);//来
//            }/** List the buckets in your account：获取所有的桶名称*/
//            System.out.println("Listing buckets");
//
//            ListBucketsRequest listBucketsRequest = new ListBucketsRequest();
//            listBucketsRequest.setMaxKeys(500);
//
//            for (Bucket bucket : ossClient.listBuckets()) { //发起请求
//                System.out.println(" - " + bucket.getName());
//            }
//            System.out.println();
///** 上传文件* Upload an object to your bucket：上传对象到你的桶中*/
//            System.out.println("Uploading a new object to OSS from a file\n");
//            File file = new File("C:\\Users\\93997\\Desktop\\桌面壁纸\\1.png");
//            String saveFilePath = key + file.getName();//拼接目标路径 + 图片名称
//            //第一个参数为：桶的名称；第二个参数为路径+上你的文件名，如test/1.png，若是test/test2/1.png，也会给我们自动创建目录
//            //第三个参数为：文件对象
//            ossClient.putObject(new PutObjectRequest(bucketName,saveFilePath , file));
//            //拼接获取公共访问地址
//            String publicVisitPath = "http://" + bucketName + '.' +  shortEndpoint + "/" + saveFilePath;
//            System.out.println("访问路径：" + publicVisitPath);
//
//            /*
//             * 删除文件
//             * Delete an object：删除对象
//             */System.out.println("Deleting an object\n");File file = new File("C:\\Users\\93997\\Desktop\\桌面壁纸\\1.png");String saveFilePath = key + file.getName();//拼接目标路径 + 图片名称ossClient.deleteObject(bucketName, saveFilePath);//            /*
//             * Determine whether an object residents in your bucket：判断对象是否存在你的桶
//             */
//            boolean exists = ossClient.doesObjectExist(bucketName, key);
//            System.out.println("Does object " + bucketName + " exist? " + exists + "\n");
//
//            ossClient.setObjectAcl(bucketName, key, CannedAccessControlList.PublicRead);
//            ossClient.setObjectAcl(bucketName, key, CannedAccessControlList.Default);
//
//            ObjectAcl objectAcl = ossClient.getObjectAcl(bucketName, key);
//            System.out.println("ACL:" + objectAcl.getPermission().toString());
//
//            /*
//             * Download an object from your bucket
//             */
//            System.out.println("Downloading an object");
//            OSSObject object = ossClient.getObject(bucketName, key);
//            System.out.println("Content-Type: "  + object.getObjectMetadata().getContentType());
//            displayTextInputStream(object.getObjectContent());
//
//            /*
//             * List objects in your bucket by prefix
//             */
//            System.out.println("Listing objects");
//            ObjectListing objectListing = ossClient.listObjects(bucketName, "My");
//            for (OSSObjectSummary objectSummary : objectListing.getObjectSummaries()) {
//                System.out.println(" - " + objectSummary.getKey() + "  " +
//                                   "(size = " + objectSummary.getSize() + ")");
//            }
//            System.out.println();
//} 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.getErrorMessage());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.*/ossClient.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\n");writer.write("0123456789011234567890\n");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();}}

二、实战系列

2.1、上传文件-简单上传

配套代码：AliyunOss-SDK—Gitee、AliyunOss-SDK—Github

文档可见官网有对应不同功能的代码示例：简单上传文档

测试其中的上传文件流：直接复制的上面文件流的示例代码，然后去修改一下配置信息即可

package com.changlu;import com.aliyun.oss.ClientException;
import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.OSSException;
import java.io.FileInputStream;
import java.io.InputStream;public class Demo {public static void main(String[] args) throws Exception {// Endpoint以华东1（杭州）为例，其它Region请按实际情况填写。String endpoint = "";// 阿里云账号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用户进行API访问或日常运维，请登录RAM控制台创建RAM用户。String accessKeyId = "";String accessKeySecret = "";// 填写Bucket名称，例如examplebucket。String bucketName = "";// 填写Object完整路径，完整路径中不能包含Bucket名称，例如exampledir/exampleobject.txt。String objectName = "2.png";// 填写本地文件的完整路径，例如D:\\localpath\\examplefile.txt。// 如果未指定本地路径，则默认从示例程序所属项目对应本地路径中上传文件流。String filePath= "C:\\Users\\93997\\Desktop\\桌面壁纸\\1.png";// 创建OSSClient实例。OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);try {InputStream inputStream = new FileInputStream(filePath);            // 创建PutObject请求。ossClient.putObject(bucketName, objectName, inputStream);} 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.getErrorMessage());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 {if (ossClient != null) {ossClient.shutdown();}}}
}    

若是你的配置没有问题，程序不会报任何代码错误！

接下来检查一下对应阿里云的bucket文件列表是否有对应的文件：

2.2、集成OSS的SDK包及封装阿里云OSS存储服务（上传、删除功能，含源码）

配套代码：AliyunOssService-Gitee 、AliyunOssService-Github

上传、删除方法已经封装到Utils中，controller只需要调用工具类的上传、删除即可！

application.yml：

# 图片文件上传
spring:servlet:multipart:max-file-size: 100MBmax-request-size: 1000MB# 阿里云OSS配置
aliyun:oss:endpoint:   # 坐标地区示例：oss-cn-beijing.aliyuncs.comaccessKeyId:  # 注册用户的keyIDaccessKeySecret:   # 注册用户的密钥bucketName:   # 桶名称 示例：pictured-stkey:     # 存储根路径，例如：img/，以目录形式为结尾，之后图片会自动生成并添加到后缀

package com.changlu.config;import lombok.Data;
import lombok.ToString;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;/*** @ClassName AliyunOssConfig* @Author ChangLu* @Date 3/26/2022 4:22 PM* @Description 阿里云OOS配置*/
@Component
// 指定配置文件中自定义属性前缀
@ConfigurationProperties(prefix = "aliyun.oss")
@Data
@ToString
public class AliyunOssConfig {private String endpoint;private String accessKeyId;private String accessKeySecret;private String bucketName;private String key;}

package com.changlu.controller;import com.changlu.domain.ResponseResult;
import com.changlu.utils.AliyunOssUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;import java.util.HashMap;
import java.util.Map;/*** @ClassName UploadController* @Author ChangLu* @Date 3/26/2022 5:23 PM* @Description Oss文件控制器*/
@RestController
public class OssFileController {@Autowiredprivate AliyunOssUtil aliOssUtil;/*** 上传图片* @param file* @return*/@PostMapping("/upload")public ResponseResult uploadFile(@RequestParam("file")MultipartFile file){try {String visitUrl = aliOssUtil.uploadFile(file);Map result = new HashMap<>(1);result.put("visitUrl", visitUrl);return new ResponseResult(200,"上传成功！", result);}catch (Exception e){e.printStackTrace();return new ResponseResult(500,"上传失败！");}}/*** 删除图片* @param fileName 文件名称如：b8809d28-82ec-4b06-af5f-8d3d7a16107c.jpg* @return*/@GetMapping("/deleFile/{fileName}")public ResponseResult deleteFile(@PathVariable("fileName")String fileName){try {aliOssUtil.deleteFile(fileName);return new ResponseResult(200,"删除成功！");} catch (Exception e) {e.printStackTrace();return new ResponseResult(500,"删除失败！");}}}

import com.fasterxml.jackson.annotation.JsonInclude;/*** @Author changlu*/
@JsonInclude(JsonInclude.Include.NON_NULL)
public class ResponseResult {/*** 状态码*/private Integer code;/*** 提示信息，如果有错误时，前端可以获取该字段进行提示*/private String msg;/*** 查询到的结果数据，*/private T data;public ResponseResult(Integer code, String msg) {this.code = code;this.msg = msg;}public ResponseResult(Integer code, T data) {this.code = code;this.data = data;}public Integer getCode() {return code;}public void setCode(Integer code) {this.code = code;}public String getMsg() {return msg;}public void setMsg(String msg) {this.msg = msg;}public T getData() {return data;}public void setData(T data) {this.data = data;}public ResponseResult(Integer code, String msg, T data) {this.code = code;this.msg = msg;this.data = data;}
}

package com.changlu.utils;import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClient;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.model.ObjectMetadata;
import com.aliyun.oss.model.PutObjectRequest;
import com.changlu.config.AliyunOssConfig;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;import java.io.File;
import java.io.InputStream;
import java.util.UUID;/*** @ClassName AliyunOssUtil* @Author ChangLu* @Date 3/26/2022 4:51 PM* @Description OSS对象存储工具类*/
@Component
public class AliyunOssUtil {@Autowiredprivate AliyunOssConfig aliyunOssConfig;/*** 创建一个OSS连接* @return OssClient*/private OSS createOssClient(){String endpoint = "http://" + aliyunOssConfig.getEndpoint();String accessKeyId = aliyunOssConfig.getAccessKeyId();String accessKeySecret = aliyunOssConfig.getAccessKeySecret();return new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);}/*** 关闭连接* @param ossClient*/private void close(OSS ossClient){if (ossClient != null) {ossClient.shutdown();}}/*** 上传文件* @param file File类型* @return*/public String uploadFile(File file){String key = aliyunOssConfig.getKey();String bucketName = aliyunOssConfig.getBucketName();String endpoint = aliyunOssConfig.getEndpoint();//1、取得保存文件路径saveFilePath：拼接目标路径 + 图片名称String originFileName = file.getName();String filePrefix = UUID.randomUUID().toString();String saveFileName = filePrefix + originFileName.substring(file.getName().indexOf("."));String saveFilePath = key + saveFileName;OSS ossClient = null;try {ossClient = createOssClient();//2、上传文件//第一个参数为：桶的名称；第二个参数为路径+上你的文件名，如test/1.png，若是test/test2/1.png，也会给我们自动创建目录//第三个参数为：文件对象ossClient.putObject(new PutObjectRequest(bucketName,saveFilePath , file));}catch (Exception e){e.printStackTrace();return null;}finally {this.close(ossClient);}//3、拼接获取公共访问地址String publicVisitPath = "http://" + bucketName + '.' +  endpoint + "/" + saveFilePath;return publicVisitPath;}/*** 上传文件* @param file MultipartFile类型* @return*/public String uploadFile(MultipartFile file)throws Exception{String key = aliyunOssConfig.getKey();String bucketName = aliyunOssConfig.getBucketName();String endpoint = aliyunOssConfig.getEndpoint();//1、取得保存文件路径saveFilePath：拼接目标路径 + 图片名称String originFileName = file.getOriginalFilename();String filePrefix = UUID.randomUUID().toString();String saveFileName = filePrefix + originFileName.substring(originFileName.indexOf("."));String saveFilePath = key + saveFileName;OSS ossClient = null;try {ossClient = createOssClient();//2、上传文件//第一个参数为：桶的名称；第二个参数为路径+上你的文件名，如test/1.png，若是test/test2/1.png，也会给我们自动创建目录//第三个参数为：文件对象/*** 阿里云OSS 默认图片上传ContentType是image/jpeg* 图片链接后，图片是下载链接，而并非在线浏览链接* 这里在上传的时候要解决ContentType的问题，将其改为image/jpg*/InputStream is = file.getInputStream();ObjectMetadata meta = new ObjectMetadata();meta.setContentType("image/jpg");ossClient.putObject(new PutObjectRequest(bucketName,saveFilePath , is, meta));}catch (Exception e){throw new RuntimeException(e);}finally {this.close(ossClient);}//3、拼接获取公共访问地址String publicVisitPath = "http://" + bucketName + '.' +  endpoint + "/" + saveFilePath;return publicVisitPath;}/*** 删除文件* @param fileName 待删除的文件名* @return*/public void deleteFile(String fileName)throws Exception{String key = aliyunOssConfig.getKey();String bucketName = aliyunOssConfig.getBucketName();//1、拼接待删除路径String deleteFilePath = key + fileName;OSS ossClient = null;try {ossClient = createOssClient();//2、删除文件ossClient.deleteObject(bucketName, deleteFilePath);}catch (Exception e){throw new RuntimeException(e);}finally {this.close(ossClient);}}}

2.3、集成SpringCloud-Alibaba-OSS

环境依赖配置

pom.xml：三个版本依次为springboot2.1.8、springcloud Greenwich.SR3、SpringCloud Alibaba2.1.0.RELEASE

org.springframework.bootspring-boot-starter-parent2.1.8.RELEASE 
1.8Greenwich.SR3
org.springframework.bootspring-boot-starter-weborg.springframework.bootspring-boot-starter-testtestcom.alibaba.cloudspring-cloud-starter-alicloud-oss
org.springframework.bootspring-boot-maven-plugin
org.springframework.cloudspring-cloud-dependencies${spring-cloud.version}pomimportcom.alibaba.cloudspring-cloud-alibaba-dependencies2.1.0.RELEASEpomimport

2.3.1、实现普通上传

配套代码：springcloud-alibaba-oss-Gitee 、springcloud-alibaba-oss-Github

server:port: 8888
spring:cloud:alicloud:access-key: secret-key: oss:endpoint: # 这是自定义的，需要自己来去读取bucketname: 

接着对应demo写在了test的示例中：下面黄色框的就是我们需要自己额外编写的，其他的上传操作和之前的普通上传基本一致

package com.changlu;import com.aliyun.oss.ClientException;
import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSException;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;/*** @Description:* @Author: changlu* @Date: 5:44 PM*/@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringCloudOSSApplicationTest {@Autowiredprivate OSS ossClient;@Value("${spring.cloud.alicloud.oss.bucketname}")private String bucketName;//普通上传文件服务@Testpublic void test() {// 填写Object完整路径，完整路径中不能包含Bucket名称，例如exampledir/exampleobject.txt。String objectName = "4.png";// 填写本地文件的完整路径，例如D:\\localpath\\examplefile.txt。// 如果未指定本地路径，则默认从示例程序所属项目对应本地路径中上传文件流。String filePath= "C:\\Users\\93997\\Desktop\\桌面壁纸\\1.png";try {InputStream inputStream = new FileInputStream(filePath);// 创建PutObject请求。ossClient.putObject(bucketName, objectName, inputStream);} 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.getErrorMessage());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());} catch (FileNotFoundException e) {e.printStackTrace();} finally {if (ossClient != null) {ossClient.shutdown();}}}
}

运行一下，若是没有任何报错信息的话，那么此时说就说上传成功：

2.3.2、获取服务端签名（web端来实现上传功能）

后端代码

配套代码：springcloud-alibaba-oss-Gitee 、springcloud-alibaba-oss-Github

文档地址：最佳实践-web端上传数据至OSS-服务器端直传并设置上传回调

pom.xml：

4.0.0org.springframework.bootspring-boot-starter-parent2.1.8.RELEASE com.changluspringcloud-alibaba-oss0.0.1-SNAPSHOTspringcloud-alibaba-ossDemo project for Spring Boot1.8Greenwich.SR3org.springframework.bootspring-boot-starter-weborg.springframework.bootspring-boot-starter-testtestcom.alibaba.cloudspring-cloud-starter-alicloud-ossorg.springframework.bootspring-boot-maven-pluginorg.springframework.cloudspring-cloud-dependencies${spring-cloud.version}pomimportcom.alibaba.cloudspring-cloud-alibaba-dependencies2.1.0.RELEASEpomimport

application.yml：

server:port: 8888
spring:cloud:alicloud:access-key: secret-key: oss:endpoint: # 这是自定义的，需要自己来去读取bucketname: 

R.java：统一封装响应类

package com.changlu.utils;import java.util.HashMap;
import java.util.Map;/*** 返回数据* * @author chenshun* @email sunlightcs@gmail.com* @date 2016年10月27日 下午9:59:27*/
public class R extends HashMap {private static final long serialVersionUID = 1L;public R() {put("code", 0);put("msg", "success");}public static R error() {return error(500, "未知异常，请联系管理员");}public static R error(String msg) {return error(500, msg);}public static R error(int code, String msg) {R r = new R();r.put("code", code);r.put("msg", msg);return r;}public static R ok(String msg) {R r = new R();r.put("msg", msg);return r;}public static R ok(Map map) {R r = new R();r.putAll(map);return r;}public static R ok() {return new R();}public R put(String key, Object value) {super.put(key, value);return this;}
}

OssController.java：提供获取签名服务

package com.changlu.controller;import com.aliyun.oss.OSS;
import com.aliyun.oss.common.utils.BinaryUtil;
import com.aliyun.oss.model.MatchMode;
import com.aliyun.oss.model.PolicyConditions;
import com.changlu.utils.R;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.Map;/*** @Description:* @Author: changlu* @Date: 7:03 PM*/
@RestController
public class OssController {@Autowiredprivate OSS ossClient;@Value("${spring.cloud.alicloud.oss.bucketname}")private String bucketName;@Value("${spring.cloud.alicloud.access-key}")private String accessId;@Value("${spring.cloud.alicloud.oss.endpoint}")private String endpoint;@RequestMapping("/oss/policy")public R policy() {// 填写Host地址，格式为https://bucketname.endpoint。String host = "https://" + bucketName + "." + endpoint;String dirName = new SimpleDateFormat("yyyy-MM-dd").format(new Date());// 设置上传到OSS文件的前缀，可置空此项。置空后，文件将上传至Bucket的根目录下。String dir = dirName + "/";Map respMap = null;try {long expireTime = 30;long expireEndTime = System.currentTimeMillis() + expireTime * 1000;Date expiration = new Date(expireEndTime);PolicyConditions policyConds = new PolicyConditions();policyConds.addConditionItem(PolicyConditions.COND_CONTENT_LENGTH_RANGE, 0, 1048576000);policyConds.addConditionItem(MatchMode.StartWith, PolicyConditions.COND_KEY, dir);//生成签名String postPolicy = ossClient.generatePostPolicy(expiration, policyConds);byte[] binaryData = postPolicy.getBytes("utf-8");String encodedPolicy = BinaryUtil.toBase64String(binaryData);String postSignature = ossClient.calculatePostSignature(postPolicy);respMap = new LinkedHashMap();respMap.put("accessid", accessId);respMap.put("policy", encodedPolicy);respMap.put("signature", postSignature);respMap.put("dir", dir);respMap.put("host", host);respMap.put("expire", String.valueOf(expireEndTime / 1000));} catch (Exception e) {// Assert.fail(e.getMessage());System.out.println(e.getMessage());}return R.ok().put("data", respMap);}}

测试下：成功获取

前端代码

这里组件源代码可以直接可以查看谷粒商城博客笔记：谷粒商城-基础篇(详细流程梳理+代码)

这里面包含了组件源代码以及实际引入项目并使用的前端案例。

注意点

1、每次使用完OSSClient后要进行关闭，ossClient.shutdown()。

OSSClient不关闭，导致大量FullGC

2、可不可以设置OSSClient为单例？

• new OSSClient只是初始化一堆对象，并未建立长连接，如果你endpoint和权限是固定的，定义成static变量都行，只有在有实际操作时，才会httpClient.execute()，我每次都new这个客户端，是因为包装sdk给业务用时，CredentialsProvider这个是动态的
• 建议在方法中创建OSSClient 而不是使用@Bean注入，不然容易出现Connection pool shut down。

参考资料

[1] 一小时学会使用springboot操作阿里云OSS实现文件上传，下载，删除(附源码)

[2] SpringBoot整合阿里云OSS