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

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

此操作将您签名的私有 CA 证书导入 AWS 私有 CA。在调用此操作之前，必须先通过调用该[CreateCertificateAuthority](https://docs.aws.amazon.com/privateca/latest/APIReference/API_CreateCertificateAuthority.html)操作创建私有证书颁发机构。然后，您必须通过调用[GetCertificateAuthorityCsr](https://docs.aws.amazon.com/privateca/latest/APIReference/API_GetCertificateAuthorityCsr.html)操作来生成证书签名请求 (CSR)。将该 CSR 放至本地 CA 并使用您的根或从属证书对其签名。创建证书链并将签名的证书和证书链复制到您的工作目录。

```
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.ImportCertificateAuthorityCertificateRequest;

import com.amazonaws.AmazonClientException;
import com.amazonaws.services.acmpca.model.RequestInProgressException;
import com.amazonaws.services.acmpca.model.MalformedCertificateException;
import com.amazonaws.services.acmpca.model.ResourceNotFoundException;
import com.amazonaws.services.acmpca.model.ConcurrentModificationException;
import com.amazonaws.services.acmpca.model.InvalidArnException;
import com.amazonaws.services.acmpca.model.CertificateMismatchException;
import com.amazonaws.services.acmpca.model.RequestFailedException;

import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.util.Objects;

public class ImportCertificateAuthorityCertificate {

   public static ByteBuffer stringToByteBuffer(final String string) {
      if (Objects.isNull(string)) {
          return null;
      }
      byte[] bytes = string.getBytes(StandardCharsets.UTF_8);
      return ByteBuffer.wrap(bytes);
      }

   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 disk", 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 and set the signed certificate, chain and CA ARN.
      ImportCertificateAuthorityCertificateRequest req =
            new ImportCertificateAuthorityCertificateRequest();

      // Set the signed certificate.
      String strCertificate =
            "{{-----BEGIN CERTIFICATE-----\n}}" +
            "{{base64-encoded certificate\n}}" +
            "{{-----END CERTIFICATE-----\n}}";
      ByteBuffer certByteBuffer = stringToByteBuffer(strCertificate);
      req.setCertificate(certByteBuffer);

      // Set the certificate chain.
      String strCertificateChain =
            "{{-----BEGIN CERTIFICATE-----\n}}" +
            "{{base64-encoded certificate\n}}" +
            "{{-----END CERTIFICATE-----\n}}";
      ByteBuffer chainByteBuffer = stringToByteBuffer(strCertificateChain);
      req.setCertificateChain(chainByteBuffer);

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

      // Import the certificate.
      try {
         client.importCertificateAuthorityCertificate(req);
      } catch (CertificateMismatchException ex) {
         throw ex;
      } catch (MalformedCertificateException ex) {
         throw ex;
      } catch (InvalidArnException ex) {
         throw ex;
      } catch (ResourceNotFoundException ex) {
         throw ex;
      } catch (RequestInProgressException ex) {
         throw ex;
      } catch (ConcurrentModificationException ex) {
         throw ex;
      } catch (RequestFailedException ex) {
         throw ex;
      }
   }
}
```