Append to a file
A transaction that appends new file content to the end of an existing file. The contents of the file can be viewed by submitting a FileContentsQuery request.
Transaction Signing Requirements
The key on the file is required to sign the transaction if different than the client operator account key
Transaction Fees
Please see the transaction and query fees table for base transaction fee
Please use the Hedera fee estimator to estimate your transaction fee cost
FileAppendTransaction()
Initializes the FileAppendTransaction object
new FileAppendTransaction()
Methods
setFileId(<fileId>)
FileId
The ID of the file to append
Required
setContents(<text>)
String
The content in String format
Optional
setContents(<content>)
byte [ ]
The content in byte format
Optional
setChunkSize(<chunkSize>)
int
The chunk size
Optional
setMaxChunkSize(<maxChunks>)
int
The max chunk size
Optional
//Create the transaction
FileAppendTransaction transaction = new FileAppendTransaction()
.setFileId(newFileId)
.setContents("The appended contents");
//Change the default max transaction fee to 2 hbars
FileCreateTransaction modifyMaxTransactionFee = transaction.setMaxTransactionFee(new Hbar(2));
//Prepare transaction for signing, sign with the key on the file, sign with the client operator key and submit to a Hedera network
TransactionResponse txResponse = modifyMaxTransactionFee.freezeWith(client).sign(key).execute(client);
//Request the receipt
TransactionReceipt receipt = txResponse.getReceipt(client);
//Get the transaction consensus status
Status transactionStatus = receipt.status;
System.out.println("The transaction consensus status is " +transactionStatus);
//v2.0.0
Get transaction values
getFileId()
FileId
The file ID in the transaction
Optional
getContents()
String
The content in the transaction
Optional
//Create the transaction
FileAppendTransaction transaction = new FileAppendTransaction()
.setFileId(newFileId)
.setContents("The appended contents");
//Get the contents
ByteString getContents = transaction.getContents();
//v2.0.0
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