import com.volcengine.tos.TOSV2;​
import com.volcengine.tos.TOSV2ClientBuilder;​
import com.volcengine.tos.TosClientException;​
import com.volcengine.tos.model.object.PreSignedPostSignatureInput;​
import com.volcengine.tos.model.object.PreSignedPostSignatureOutput;​
​
public class PreSignedPostSignatureExample {​
    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";​
        String objectKey = "example_dir/example_object.txt";​
        long expires = 3600;​
        List<PostSignatureCondition> conditions = new ArrayList<>(2);​
        conditions.add(new PostSignatureCondition("x-tos-acl", "private"));​
        conditions.add(new PostSignatureCondition("key", objectKey, "starts-with"));​
​
        TOSV2 tos = new TOSV2ClientBuilder().build(region, endpoint, accessKey, secretKey);​
​
        try{​
            PreSignedPostSignatureInput input = new PreSignedPostSignatureInput().setBucket(bucketName)​
                    .setExpires(expires).setConditions(conditions);​
            PreSignedPostSignatureOutput output = tos.preSignedPostSignature(input);​
            System.out.println("preSignedPostSignature succeed, the signature is " + output.getSignature());​
            System.out.println("the credential is " + output.getCredential());​
            System.out.println("the policy is " + output.getPolicy());​
            System.out.println("the date is " + output.getDate());​
            System.out.println("the algorithm is " + output.getAlgorithm());​
            System.out.println("the originPolicy is " + output.getOriginPolicy());​
        } catch (TosClientException e) {​
            System.out.println("preSignedPostSignature failed");​
            System.out.println("Message: " + e.getMessage());​
            if (e.getCause() != null) {​
                e.getCause().printStackTrace();​
            }​
        } catch (Throwable t) {​
            System.out.println("preSignedPostSignature failed");​
            System.out.println("unexpected exception, message: " + t.getMessage());​
        }​
    }​
}​