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# UpdateCertificateAuthority
<a name="JavaApi-UpdateCertificateAuthority"></a>

以下 Java 示例显示了如何使用该[UpdateCertificateAuthority](https://docs.aws.amazon.com/privateca/latest/APIReference/API_UpdateCertificateAuthority.html)操作。

此操作可更新私有证书颁发机构 (CA) 的状态或配置。您的私有 CA 必须处于 `ACTIVE` 或 `DISABLED` 状态，您才能更新它。您可以禁用处于 `ACTIVE` 状态的私有 CA，或使处于 `DISABLED` 状态的 CA 再次变为活动的。

```
package com.amazonaws.samples;

import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.profile.ProfileCredentialsProvider;
import com.amazonaws.client.builder.AwsClientBuilder;
import com.amazonaws.client.builder.AwsClientBuilder.EndpointConfiguration;
import com.amazonaws.auth.AWSStaticCredentialsProvider;

import com.amazonaws.services.acmpca.AWSACMPCA;
import com.amazonaws.services.acmpca.AWSACMPCAClientBuilder;

import com.amazonaws.services.acmpca.model.UpdateCertificateAuthorityRequest;
import com.amazonaws.services.acmpca.model.CertificateAuthorityStatus;

import com.amazonaws.AmazonClientException;
import com.amazonaws.services.acmpca.model.ConcurrentModificationException;
import com.amazonaws.services.acmpca.model.ResourceNotFoundException;
import com.amazonaws.services.acmpca.model.InvalidArgsException;
import com.amazonaws.services.acmpca.model.InvalidArnException;
import com.amazonaws.services.acmpca.model.InvalidStateException;
import com.amazonaws.services.acmpca.model.InvalidPolicyException;
import com.amazonaws.services.acmpca.model.CrlConfiguration;
import com.amazonaws.services.acmpca.model.RevocationConfiguration;

public class UpdateCertificateAuthority {

   public static void main(String[] args) throws Exception {

      // Retrieve your credentials from the C:\Users\name\.aws\credentials file
      // in Windows or the .aws/credentials file in Linux.
      AWSCredentials credentials = null;
      try {
          credentials = new ProfileCredentialsProvider("default").getCredentials();
      } catch (Exception e) {
          throw new AmazonClientException("Cannot load your credentials from file.", e);
      }

      // Define the endpoint for your sample.
      String endpointRegion = "{{region}}";  // Substitute your region here, e.g. "us-west-2"
      String endpointProtocol = "https://acm-pca." + endpointRegion + ".amazonaws.com/";
      EndpointConfiguration endpoint =
          new AwsClientBuilder.EndpointConfiguration(endpointProtocol, endpointRegion);

      // Create a client that you can use to make requests.
      AWSACMPCA client = AWSACMPCAClientBuilder.standard()
          .withEndpointConfiguration(endpoint)
          .withCredentials(new AWSStaticCredentialsProvider(credentials))
          .build();

      // Create the request object.
      UpdateCertificateAuthorityRequest req = new UpdateCertificateAuthorityRequest();

      // Set the ARN of the private CA that you want to update.
      req.setCertificateAuthorityArn("arn:{{aws}}:acm-pca:{{us-east-1}}:{{111122223333}}:certificate-authority/{{11223344-1234-1122-2233-112233445566}}");

      // Define the certificate revocation list configuration. If you do not want to
      // update the CRL configuration, leave the CrlConfiguration structure alone and
      // do not set it on your UpdateCertificateAuthorityRequest object.
      CrlConfiguration crlConfigure = new CrlConfiguration();
      crlConfigure.withEnabled(true);
      crlConfigure.withExpirationInDays(365);
      crlConfigure.withCustomCname("{{your-custom-name}}");
      crlConfigure.withS3BucketName("{{your-bucket-name}}");

      // Set the CRL configuration onto your UpdateCertificateAuthorityRequest object.
      // If you do not want to change your CRL configuration, do not use the
      // setCrlConfiguration method.
      RevocationConfiguration revokeConfig = new RevocationConfiguration();
      revokeConfig.setCrlConfiguration(crlConfigure);
      req.setRevocationConfiguration(revokeConfig);

      // Set the status.
      req.withStatus(CertificateAuthorityStatus.<<ACTIVE>>);

      // Create the result object.
      try {
          client.updateCertificateAuthority(req);
      } catch (ConcurrentModificationException ex) {
          throw ex;
      } catch (ResourceNotFoundException ex) {
          throw ex;
      } catch (InvalidArgsException ex) {
          throw ex;
      } catch (InvalidArnException ex) {
          throw ex;
      } catch (InvalidStateException ex) {
          throw ex;
      } catch (InvalidPolicyException ex) {
          throw ex;
      }
   }
}
```