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第一部分：准备工作

1. 注册阿里云账号： 如果尚未拥有阿里云账号，需要先注册一个账号并创建一个 OSS 存储空间。

2. 获取Access Key和Secret Key： 在阿里云控制台中创建一个 Access Key 和 Secret Key，用于访问 OSS。

第二部分：添加依赖

在Spring Boot项目的pom.xml文件中添加阿里云OSS的依赖：

     <!--oss对象存储-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alicloud-oss</artifactId>
            <version>2.2.0.RELEASE</version>
        </dependency>

第三部分：配置阿里云OSS

spring:
  cloud:
    alicloud:
      secret-key: 
      access-key: 
      oss:
        endpoint: 
        bucket: 
    util:
      enabled: false

第四部分：创建Controller

创建一个Controller类，用于处理文件上传请求：

package com.atguigu.gulimall.thirdparty.controller;

import com.aliyun.oss.ClientException;
import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSException;
import com.aliyun.oss.common.utils.BinaryUtil;
import com.aliyun.oss.model.MatchMode;
import com.aliyun.oss.model.PolicyConditions;
import com.atguigu.common.utils.R;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.Map;

@RequestMapping("/api/files")
public class OssController {

    @Autowired
   private OSS ossClient;

    @Value("${spring.cloud.alicloud.oss.endpoint}")
    private String endpoint;

    @Value("${spring.cloud.alicloud.secret-key}")
    private String secretKey;

    @Value("${spring.cloud.alicloud.access-key}")
    private String accessId;

    @Value("${spring.cloud.alicloud.oss.bucket}")
    private String bucket;

    /**
     * 文件流上传
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public String uploadFile(@RequestParam("file") MultipartFile file) {
        String objectName = "gulimall-basc/";
        try {
            InputStream inputStream = file.getInputStream();
            String originalFilename = file.getOriginalFilename();
            objectName=objectName+originalFilename;
            // 上传文件到 OSS
            ossClient.putObject(bucket, objectName, inputStream);
            System.out.println("文件上传成功");
        } catch (OSSException oe) {
            // 处理 OSS 异常
            return R.error("OSS上传失败");
        } catch (ClientException ce) {
            // 处理 Client 异常
            System.out.println("Client Error Message:" + ce.getMessage());
            return R.error("OSS上传失败");
        } catch (IOException e) {
            e.printStackTrace();
        }
        String url="https://"+bucket+"."+endpoint+"/"+objectName;
        return R.ok().put("data", url);
    }
    /**
     * Oss 获取服务端签名，直传
     * @return
     */
    @RequestMapping("/oss/policy")
    public R policy() {

        // https://gulimall-hello.oss-cn-beijing.aliyuncs.com/hahaha.jpg  host的格式为 bucketname.endpoint
        String host = "https://" + bucket + "." + endpoint;
        // callbackUrl为 上传回调服务器的URL，请将下面的IP和Port配置为您自己的真实信息。
        // String callbackUrl = "http://88.88.88.88:8888";
        String format = new SimpleDateFormat("yyyy-MM-dd").format(new Date());
        // 用户上传文件时指定的前缀。
        String dir = "gulimall-basc/"+format + "/";

        Map<String, String> 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);

            String postPolicy = ossClient.generatePostPolicy(expiration, policyConds);
            byte[] binaryData = postPolicy.getBytes(StandardCharsets.UTF_8);
            String encodedPolicy = BinaryUtil.toBase64String(binaryData);
            String postSignature = ossClient.calculatePostSignature(postPolicy);

            respMap = new LinkedHashMap<String, String>();
            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));
            // respMap.put("expire", formatISO8601Date(expiration));

        } catch (Exception e) {
            // Assert.fail(e.getMessage());
            System.out.println(e.getMessage());
        }

        return R.ok().put("data", respMap);
    }
}

第六部分：前端页面实现

在前端页面中添加文件上传的表单，使用Ajax异步上传文件：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>File Upload</title>
</head>
<body>
    <form id="fileUploadForm" enctype="multipart/form-data">
        <input type="file" name="file" />
        <button type="button" onclick="uploadFile()">Upload</button>
    </form>

    <script>
        function uploadFile() {
            var form = document.getElementById('fileUploadForm');
            var formData = new FormData(form);

            fetch('/api/files/upload', {
                method: 'POST',
                body: formData
            })
            .then(response => response.text())
            .then(data => {
                console.log('File uploaded:', data);
            })
            .catch(error => {
                console.error('Error uploading file:', error);
            });
        }
    </script>
</body>
</html>

结语：

通过以上步骤，我们成功地在Spring Boot应用中集成了阿里云OSS文件上传功能。用户可以通过前端页面选择文件并

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