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BlobInfo (Google App Engine API for Java)

java.lang.Object
- com.google.appengine.api.blobstore.BlobInfo

All Implemented Interfaces:

java.io.Serializable
```
public class BlobInfo
extends java.lang.Object
implements java.io.Serializable
```
BlobInfo contains metadata about a blob. This metadata is gathered by parsing the HTTP headers included in the blob upload.

See Also:

RFC 1867 for the specification of HTTP file uploads., Serialized Form

Constructor Summary

Constructors
Constructor and Description
`BlobInfo(BlobKey blobKey, java.lang.String contentType, java.util.Date creation, java.lang.String filename, long size)`
`BlobInfo(BlobKey blobKey, java.lang.String contentType, java.util.Date creation, java.lang.String filename, long size, java.lang.String md5Hash)`
`BlobInfo(BlobKey blobKey, java.lang.String contentType, java.util.Date creation, java.lang.String filename, long size, java.lang.String md5Hash, java.lang.String gsObjectName)` Creates a `BlobInfo` by providing the `BlobKey` and all associated metadata.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`boolean`	`equals(java.lang.Object obj)`
`BlobKey`	`getBlobKey()` Returns the `BlobKey` of the Blob this `BlobInfo` describes.
`java.lang.String`	`getContentType()` Returns the MIME Content-Type provided in the HTTP header during upload of this Blob.
`java.util.Date`	`getCreation()` Returns the time and date the blob was upload.
`java.lang.String`	`getFilename()` Returns the file included in the Content-Disposition HTTP header during upload of this Blob.
`java.lang.String`	`getGsObjectName()` Returns the object name of this Blob, if it is stored in Google Cloud Storage, in the form `/[bucket-name]/[object-name]`.
`java.lang.String`	`getMd5Hash()` Returns the md5Hash of this Blob.
`long`	`getSize()` Returns the size in bytes of this Blob.
`int`	`hashCode()`
`java.lang.String`	`toString()`

Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - BlobInfo
```
public BlobInfo(BlobKey blobKey,
                java.lang.String contentType,
                java.util.Date creation,
                java.lang.String filename,
                long size,
                java.lang.String md5Hash,
                java.lang.String gsObjectName)
```
    Creates a BlobInfo by providing the BlobKey and all associated metadata. This is typically done by the API on the developer's behalf.
    
    Parameters:
    
    blobKey - the BlobKey of the Blob.
    
    contentType - the MIME Content-Type provided in the HTTP header during upload of this Blob.
    
    creation - the time and date the blob was uploaded.
    
    filename - the file included in the Content-Disposition HTTP header during upload of this Blob.
    
    size - the size in bytes of this Blob.
    
    md5Hash - the md5Hash of this Blob.
    
    gsObjectName - the object name of this Blob, if it is stored on Google Cloud Storage, null otherwise.
  - BlobInfo
```
public BlobInfo(BlobKey blobKey,
                java.lang.String contentType,
                java.util.Date creation,
                java.lang.String filename,
                long size,
                java.lang.String md5Hash)
```
  - BlobInfo
```
public BlobInfo(BlobKey blobKey,
                java.lang.String contentType,
                java.util.Date creation,
                java.lang.String filename,
                long size)
```
- Method Detail
  - getBlobKey
```
public BlobKey getBlobKey()
```
    Returns the BlobKey of the Blob this BlobInfo describes.
  - getContentType
```
public java.lang.String getContentType()
```
    Returns the MIME Content-Type provided in the HTTP header during upload of this Blob.
  - getCreation
```
public java.util.Date getCreation()
```
    Returns the time and date the blob was upload.
  - getFilename
```
public java.lang.String getFilename()
```
    Returns the file included in the Content-Disposition HTTP header during upload of this Blob.
  - getSize
```
public long getSize()
```
    Returns the size in bytes of this Blob.
  - getMd5Hash
```
public java.lang.String getMd5Hash()
```
    Returns the md5Hash of this Blob.
  - getGsObjectName
```
public java.lang.String getGsObjectName()
```
    Returns the object name of this Blob, if it is stored in Google Cloud Storage, in the form /[bucket-name]/[object-name]. Returns null if the Blob is stored in Blobstorage.
  - equals
```
public boolean equals(java.lang.Object obj)
```
    Overrides:
    
    equals in class java.lang.Object
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class java.lang.Object
  - toString
```
public java.lang.String toString()
```
    Overrides:
    
    toString in class java.lang.Object

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-06-16 UTC.

BlobInfo (Google App Engine API for Java) Stay organized with collections Save and categorize content based on your preferences.

Class BlobInfo

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

BlobInfo

BlobInfo

BlobInfo

Method Detail

getBlobKey

getContentType

getCreation

getFilename

getSize

getMd5Hash

getGsObjectName

equals

hashCode

toString

BlobInfo (Google App Engine API for Java)