获取图片信息功能可以获取到图片的基本信息，包括图片的长、宽、大小和格式。如果图片包含 Exif 信息，将按照 JSON 格式返回内容。本文介绍如何通过 TOS Java SDK 获取图片信息。

示例代码

以下代码展示如何获取图片信息。

import com.fasterxml.jackson.core.JacksonException;
import com.fasterxml.jackson.databind.JsonNode;
import com.volcengine.tos.TOSV2;
import com.volcengine.tos.TOSV2ClientBuilder;
import com.volcengine.tos.TosClientException;
import com.volcengine.tos.TosServerException;
import com.volcengine.tos.internal.util.TosUtils;
import com.volcengine.tos.model.object.GetObjectV2Input;
import com.volcengine.tos.model.object.GetObjectV2Output;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

public class ImageInfoExample {
    public static void main(String[] args) {
        String endpoint = "your endpoint";
        String region = "your region";
        String accessKey = System.getenv("TOS_ACCESS_KEY");
        String secretKey = System.getenv("TOS_SECRET_KEY"); 

        String bucketName = "bucket-example";
        // 需要确保对象已存在
        String objectKey = "image.png";
        String style = "image/info"; // 获取图片信息

        TOSV2 tos = new TOSV2ClientBuilder().build(region, endpoint, accessKey, secretKey);
        try {
            GetObjectV2Input input = new GetObjectV2Input().setBucket(bucketName).setKey(objectKey).setProcess(style);
            try (ByteArrayOutputStream stream = new ByteArrayOutputStream();
                 GetObjectV2Output output = tos.getObject(input)) {
                byte[] buffer = new byte[1024];
                int length;
                while ((length = output.getContent().read(buffer)) != -1) {
                    stream.write(buffer, 0, length);
                }
                String respBody = stream.toString("UTF-8");
                System.out.println("Get image info succeed, image info is " + respBody);
                JsonNode jsonNode = TosUtils.getJsonMapper().readTree(respBody);
                String height = jsonNode.get("ImageHeight").get("value").asText();
                String width = jsonNode.get("ImageWidth").get("value").asText();
                String fileSize = jsonNode.get("FileSize").get("value").asText();
                String format = jsonNode.get("Format").get("value").asText();
                System.out.println("Image info height:" + height + ", width:" + width + ", size:" + fileSize + ", format:" + format);
            } catch (JacksonException e) {
                System.out.println("parse response data failed");
                e.printStackTrace();
            } catch (IOException e) {
                System.out.println("read response data failed");
                e.printStackTrace();
            }
        } catch (TosClientException e) {
            // 操作失败，捕获客户端异常，一般情况是请求参数错误，此时请求并未发送。
            System.out.println("get image info failed");
            System.out.println("Message: " + e.getMessage());
            if (e.getCause() != null) {
                e.getCause().printStackTrace();
            }
        } catch (TosServerException e) {
            // 操作失败，捕获服务端异常，可以获取到从服务端返回的详细错误信息。
            System.out.println("get image info failed");
            System.out.println("StatusCode: " + e.getStatusCode());
            System.out.println("Code: " + e.getCode());
            System.out.println("Message: " + e.getMessage());
            System.out.println("RequestID: " + e.getRequestID());
        } catch (Throwable t) {
            // 作为兜底捕获其他异常，一般不会执行到这里。
            System.out.println("get image info failed");
            System.out.println("unexpected exception, message: " + t.getMessage());
        }
    }
}

相关文档

关于获取图片信息的详细介绍，请参见获取信息。