本文整理了Java中com.google.cloud.storage.Blob.exists()方法的一些代码示例，展示了Blob.exists()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Blob.exists()方法的具体详情如下：
包路径：com.google.cloud.storage.Blob
类名称：Blob
方法名：exists

Blob.exists介绍

[英]Checks if this blob exists.

Example of checking if the blob exists.

boolean exists = blob.exists();else  
// the blob was not found 
} 
}

[中]检查此blob是否存在。
检查blob是否存在的示例。

boolean exists = blob.exists();else  
// the blob was not found 
} 
}

代码示例

代码示例来源：origin: googleapis/google-cloud-java

/** Example of checking if the blob exists. */
// [TARGET exists(BlobSourceOption...)]
public boolean exists() {
 // [START exists]
 boolean exists = blob.exists();
 if (exists) {
  // the blob exists
 } else {
  // the blob was not found
 }
 // [END exists]
 return exists;
}

代码示例来源：origin: googleapis/google-cloud-java

@Test
public void testExists_False() throws Exception {
 Storage.BlobGetOption[] expectedOptions = {Storage.BlobGetOption.fields()};
 expect(storage.getOptions()).andReturn(null);
 expect(storage.get(BLOB_INFO.getBlobId(), expectedOptions)).andReturn(null);
 replay(storage);
 initializeBlob();
 assertFalse(blob.exists());
}

代码示例来源：origin: googleapis/google-cloud-java

@Test
public void testExists_True() throws Exception {
 initializeExpectedBlob(1);
 Storage.BlobGetOption[] expectedOptions = {Storage.BlobGetOption.fields()};
 expect(storage.getOptions()).andReturn(mockOptions);
 expect(storage.get(expectedBlob.getBlobId(), expectedOptions)).andReturn(expectedBlob);
 replay(storage);
 initializeBlob();
 assertTrue(blob.exists());
}

代码示例来源：origin: spring-cloud/spring-cloud-gcp

/**
 * Returns the output stream for a Google Cloud Storage file.
 * @return the object's output stream or {@code null} if the object doesn't exist and cannot be
 * created
 * @throws IOException if an issue occurs getting the OutputStream
 */
@Override
public OutputStream getOutputStream() throws IOException {
  if (isBucket()) {
    throw new IllegalStateException("Cannot open an output stream to a bucket: '" + this.location + "'");
  }
  else {
    Blob blob = getBlob();
    if (blob == null || !blob.exists()) {
      if (!this.autoCreateFiles) {
        throw new FileNotFoundException("The blob was not found: " + this.location);
      }
      blob = createBlob();
    }
    return Channels.newOutputStream(blob.writer());
  }
}

代码示例来源：origin: org.springframework.cloud/spring-cloud-gcp-storage

/**
 * Returns the output stream for a Google Cloud Storage file.
 * @return the object's output stream or {@code null} if the object doesn't exist and cannot be
 * created
 * @throws IOException if an issue occurs getting the OutputStream
 */
@Override
public OutputStream getOutputStream() throws IOException {
  if (isBucket()) {
    throw new IllegalStateException("Cannot open an output stream to a bucket: '" + this.location + "'");
  }
  else {
    Blob blob = getBlob();
    if (blob == null || !blob.exists()) {
      if (!this.autoCreateFiles) {
        throw new FileNotFoundException("The blob was not found: " + this.location);
      }
      blob = createBlob();
    }
    return Channels.newOutputStream(blob.writer());
  }
}

代码示例来源：origin: ai.h2o/h2o-persist-gcs

@Override
public boolean exists(String path) {
 final String bk[] = split(path);
 if (bk.length == 1) {
  return storageProvider.getStorage().get(bk[0]).exists();
 } else if (bk.length == 2) {
  Blob blob = storageProvider.getStorage().get(bk[0], bk[1]);
  return blob != null && blob.exists();
 } else {
  return false;
 }
}