Spring Boot项目中实现文件上传功能的示例

<!-- 阿里云OSS对象存储 -->
<dependency>
	<groupId>com.aliyun.oss</groupId>
	<artifactId>aliyun-sdk-oss</artifactId>
	<version>3.8.0</version>
</dependency>

# 节点域名
aliyun.oss.endpoint=oss-cn-xxxxxxx.aliyuncs.com
# 账户id
aliyun.oss.accessKeyId=xxxxxxxxxxxxx
# 账户密码
aliyun.oss.accessKeySecret=xxxxxxxxxxxxx
# bucket名称
aliyun.oss.bucketName=xxxxxxxxxxx
# 签名过期时间
aliyun.oss.policy.expire=300
# 上传文件的最大尺寸
aliyun.oss.maxSize=10
# 上传地址的前缀
aliyun.oss.dir.prefix=xxx
# 回调参数的请求地址
aliyun.oss.callback=http://www.xxxxxx.com/api/aliyun/oss/callback

@Configuration
@PropertySource(value = {"classpath:application.properties"}, encoding = "utf-8")
public class OssConfig {

 @Value("${aliyun.oss.endpoint}")
 private String endpoint;

 @Value("${aliyun.oss.accessKeyId}")
 private String accessKeyId;

 @Value("${aliyun.oss.accessKeySecret}")
 private String secretAccessKey;

 @Bean
 public OSS ossClient(){
 return new OSSClientBuilder().build(endpoint, accessKeyId, secretAccessKey);
 }
}

PolicyConditions policyConds = new PolicyConditions();
policyConds.addConditionItem(PolicyConditions.COND_CONTENT_LENGTH_RANGE, 0, maxSize);
policyConds.addConditionItem(MatchMode.StartWith, PolicyConditions.COND_KEY, DIR_PREFIX);
String postPolicy = ossClient.generatePostPolicy(expiration, policyConds);
byte[] binaryData = postPolicy.getBytes(StandardCharsets.UTF_8);
// 将Policy字符串进行base64编码
String policy = BinaryUtil.toBase64String(binaryData);
// 用OSS的AccessKeySecret对base64编码后的Policy进行签名
String signature = ossClient.calculatePostSignature(postPolicy);

// 上传回调参数
Callback callback = new Callback();
// 指定请求回调的服务器URL
callback.setCallbackUrl(CALLBACK);
//（可选）设置回调请求消息头中Host的值，即您的服务器配置Host的值。
// callback.setCallbackHost("yourCallbackHost");
// 设置发起回调时请求body的值。
callback.setCallbackBody("{\\\"filename\\\":${object},\\\"mineType\\\":${mimeType}}");
// 设置发起回调请求的Content-Type。
callback.setCalbackBodyType(Callback.CalbackBodyType.JSON);
// 设置发起回调请求的自定义参数，由Key和Value组成，Key必须以x:开始。
// callback.addCallbackVar("x:dir", "value");

@Data
public class OssPolicyResult {

	@ApiModelProperty("用户id")
	private String accessKeyId;
	
	@ApiModelProperty("Post Policy经过base64编码过的字符串")
 private String policy;
	
	@ApiModelProperty("对policy签名后的字符串")
 private String signature;

	// @ApiModelProperty("对象的键值")
	// private String key;
	
	@ApiModelProperty("上传文件夹路径前缀")
 private String dir;
	
	@ApiModelProperty("oss对外服务的访问域名")
 private String host;

	@ApiModelProperty("上传成功后的回调设置")
	private String callback;
}

@Data
public class OssCallBackResult {

 @ApiModelProperty("文件的链接")
 private String url;
 @ApiModelProperty("文件名称")
 private String filename;
 @ApiModelProperty("文件大小")
 private String size;
 @ApiModelProperty("文件的mimeType")
 private String mimeType;
 @ApiModelProperty("图片文件的宽")
 private String width;
 @ApiModelProperty("图片文件的高")
 private String height;
}

public interface OssService {
	
 // 生成Post Policy
	OssPolicyResult policy();
	
 // 上传成功后的回调
	OssCallBackResult callback(Map<String, Object> requestBody);
}

@Slf4j
@Service
@PropertySource(value = {"classpath:application.properties"}, encoding = "utf-8")
public class OssServiceImpl implements OssService {

	@Value("${aliyun.oss.endpoint}")
	private String ENDPOINT;

	@Value("${aliyun.oss.accessKeyId}")
	private String ACCESS_KEY_ID;

	@Value("${aliyun.oss.accessKeySecret}")
	private String SECRET_ACCESS_KEY;

	@Value("${aliyun.oss.bucketName}")
	private String BUCKET_NAME;

	@Value("${aliyun.oss.policy.expire}")
	private int EXPIRE;

	@Value("${aliyun.oss.maxSize}")
	private int MAX_SIZE;

	@Value("${aliyun.oss.dir.prefix}")
	private String DIR_PREFIX;

	@Value("${aliyun.oss.callback}")
	private String CALLBACK;

	@Autowired
	private OSS ossClient;

	@Override
	public OssPolicyResult policy() {
		OssPolicyResult result = new OssPolicyResult();
		// 签名有效期
		long expireEndTime = System.currentTimeMillis() + EXPIRE * 1000;
		Date expiration = new Date(expireEndTime);
		// 文件名称
		// String filename = UUID.randomUUID().toString();
		// 文件大小
		long maxSize = MAX_SIZE * 1024 * 1024;
		// 提交节点
		String action = "http://" + BUCKET_NAME + "." + ENDPOINT;
		// 上传回调参数
		Callback callback = new Callback();
		// 指定请求回调的服务器URL
		callback.setCallbackUrl(CALLBACK);
		//（可选）设置回调请求消息头中Host的值，即您的服务器配置Host的值。
		// callback.setCallbackHost("yourCallbackHost");
		// 设置发起回调时请求body的值。
		callback.setCallbackBody("{\\\"filename\\\":${object}}");
		// 设置发起回调请求的Content-Type。
		callback.setCalbackBodyType(Callback.CalbackBodyType.JSON);
		// 设置发起回调请求的自定义参数，由Key和Value组成，Key必须以x:开始。
		// callback.addCallbackVar("x:dir", "value");
		try {
			PolicyConditions policyConds = new PolicyConditions();
			policyConds.addConditionItem(PolicyConditions.COND_CONTENT_LENGTH_RANGE, 0, maxSize);
			policyConds.addConditionItem(MatchMode.StartWith, PolicyConditions.COND_KEY, DIR_PREFIX);
			String postPolicy = ossClient.generatePostPolicy(expiration, policyConds);
			byte[] binaryData = postPolicy.getBytes(StandardCharsets.UTF_8);
 // 将Policy字符串进行base64编码
			String policy = BinaryUtil.toBase64String(binaryData);
 // 用OSS的AccessKeySecret对base64编码后的Policy进行签名
			String signature = ossClient.calculatePostSignature(postPolicy);
 // 将callback配置进行base64编码
			String callbackData = BinaryUtil.toBase64String(OSSUtils.jsonizeCallback(callback).getBytes());
			// 返回结果
			result.setAccessKeyId(ACCESS_KEY_ID);
			result.setPolicy(policy);
			result.setSignature(signature);
			// result.setKey(filename);
			result.setDir(dir);
			result.setHost(action);
			result.setCallback(callbackData);
		} catch (Exception e) {
			log.error("签名生成失败", e);
		}
		return result;
	}

	@Override
	public OssCallBackResult callback(Map<String, Object> requestBody) {
		OssCallBackResult ossCallbackResult = new OssCallBackResult();
		// 文件名
		String filename = requestBody.get("filename").toString();
		// 文件链接
		String url = "https://" + BUCKET_NAME + "." + ENDPOINT + "/" + DIR_PREFIX + "/" + filename;
		ossCallbackResult.setUrl(url);
		return ossCallbackResult;
	}
}

@Api(tags = "阿里云对象存储接口")
@RequestMapping("/api")
@RestController
public class OssController {
	
	@Autowired
	private OssService ossService;
	
	@ApiOperation(value = "OSS上传签名生成")
	@GetMapping("/aliyun/oss/policy")
	public Object policy() {
		return ossService.policy();
	}

	@ApiOperation(value = "OSS上传成功回调")
	@PostMapping("/aliyun/oss/callback")
	public Object callback(@RequestBody Map<String, Object> requestBody) {
		return ossService.callback(requestBody);
	}
}