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

以下 Java 示例显示了如何使用该[RestoreCertificateAuthority](https://docs.aws.amazon.com/privateca/latest/APIReference/API_RestoreCertificateAuthority.html)操作。私有 CA 在其还原期内可随时还原。当前，此期间可持续 7 到 30 天（自删除之日起），并且您可以在删除 CA 时对其进行定义。有关更多信息，请参阅 [还原 CA](PCARestoreCA.md)。另请参阅 [DeleteCertificateAuthority](JavaApi-DeleteCertificateAuthority.md) Java 示例。

```
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.RestoreCertificateAuthorityRequest;

import com.amazonaws.AmazonClientException;
import com.amazonaws.services.acmpca.model.InvalidArnException;
import com.amazonaws.services.acmpca.model.InvalidStateException;
import com.amazonaws.services.acmpca.model.ResourceNotFoundException;

public class RestoreCertificateAuthority {

   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.
      RestoreCertificateAuthorityRequest req = new RestoreCertificateAuthorityRequest();

      // Set the certificate authority ARN.
      req.withCertificateAuthorityArn("arn:{{aws}}:acm-pca:{{us-east-1}}:{{111122223333}}:certificate-authority/{{11223344-1234-1122-2233-112233445566}}");

      // Restore the CA.
      try {
          client.restoreCertificateAuthority(req);
      } catch (InvalidArnException ex) {
          throw ex;
      } catch (InvalidStateException ex) {
          throw ex;
      } catch (ResourceNotFoundException ex) {
          throw ex;
      }
   }
}
```