Read data from ByteArrayOutputStream

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I have decrypted data in bytearrayoutputstream. I want to read the data in each line(not sure if that is possible).Could any one guide how I can do that.

The main requirement is to read a encrypted file , decrypt and read the data without writing into the disk. I have already covered encrypt and decrypt part but unable to read the data without writing into disk.Some suggested to use bytearrayoutputStream so stuck now.

ByteArrayOutputStream byteArrayOutputStream=new ByteArrayOutputStream(inputBytes.length);

byteArrayOutputStream.write(outputBytes);

if i simply print the variable it give me all the data at once as below.

SQlServer,"connection string","user name","password"

Oracle,"connection string","user name","password"

I am trying to read the data line wise so i can match the servername and fetch the user name and other details.

edited Jan 4 at 12:00

Alex Shesterov

15.8k94771

asked Jan 4 at 11:53

Shubham Sahay

507

2

Possible duplicate of How to read a large text file line by line using Java?

– Alex Shesterov
Jan 4 at 12:00

have you tried to use toByteArray?

– Leonardo Alves Machado
Jan 4 at 12:03

@LeonardoAlvesMachado yes not working...could you suggest if you have a way to use it.

– Shubham Sahay
Jan 4 at 12:26

The proper way would be to not have the ByteArrayOutputStream at all, but instead wrap the file input stream in a CipherInputStream or otherwise a custom FilterInputStream, so it is decrypted while being read. There should be no need to read and decrypt the entire file to a byte array and then read it back.

– Mark Rotteveel
Jan 4 at 12:37

@ShubhamSahay I didn't quite understand why you are using an output class (used to write to streams, in your case) in order to read stuff. When I said to use toByteArray, I meant to give you the data that it contains, so you could use it in an input class (used to read data) of your choice... If you couldn't get the data from it, you might be able to get it from the variable outputBytes in your code.

– Leonardo Alves Machado
Jan 4 at 12:57

|
show 2 more comments

I have decrypted data in bytearrayoutputstream. I want to read the data in each line(not sure if that is possible).Could any one guide how I can do that.

ByteArrayOutputStream byteArrayOutputStream=new ByteArrayOutputStream(inputBytes.length);

byteArrayOutputStream.write(outputBytes);

if i simply print the variable it give me all the data at once as below.

SQlServer,"connection string","user name","password"

Oracle,"connection string","user name","password"

I am trying to read the data line wise so i can match the servername and fetch the user name and other details.

edited Jan 4 at 12:00

Alex Shesterov

15.8k94771

asked Jan 4 at 11:53

Shubham Sahay

507

2

Possible duplicate of How to read a large text file line by line using Java?

– Alex Shesterov
Jan 4 at 12:00

have you tried to use toByteArray?

– Leonardo Alves Machado
Jan 4 at 12:03

@LeonardoAlvesMachado yes not working...could you suggest if you have a way to use it.

– Shubham Sahay
Jan 4 at 12:26

The proper way would be to not have the ByteArrayOutputStream at all, but instead wrap the file input stream in a CipherInputStream or otherwise a custom FilterInputStream, so it is decrypted while being read. There should be no need to read and decrypt the entire file to a byte array and then read it back.

– Mark Rotteveel
Jan 4 at 12:37

@ShubhamSahay I didn't quite understand why you are using an output class (used to write to streams, in your case) in order to read stuff. When I said to use toByteArray, I meant to give you the data that it contains, so you could use it in an input class (used to read data) of your choice... If you couldn't get the data from it, you might be able to get it from the variable outputBytes in your code.

– Leonardo Alves Machado
Jan 4 at 12:57

|
show 2 more comments

I have decrypted data in bytearrayoutputstream. I want to read the data in each line(not sure if that is possible).Could any one guide how I can do that.

ByteArrayOutputStream byteArrayOutputStream=new ByteArrayOutputStream(inputBytes.length);

byteArrayOutputStream.write(outputBytes);

if i simply print the variable it give me all the data at once as below.

SQlServer,"connection string","user name","password"

Oracle,"connection string","user name","password"

I am trying to read the data line wise so i can match the servername and fetch the user name and other details.

edited Jan 4 at 12:00

Alex Shesterov

15.8k94771

asked Jan 4 at 11:53

Shubham Sahay

507

I have decrypted data in bytearrayoutputstream. I want to read the data in each line(not sure if that is possible).Could any one guide how I can do that.

ByteArrayOutputStream byteArrayOutputStream=new ByteArrayOutputStream(inputBytes.length);

byteArrayOutputStream.write(outputBytes);

if i simply print the variable it give me all the data at once as below.

SQlServer,"connection string","user name","password"

Oracle,"connection string","user name","password"

I am trying to read the data line wise so i can match the servername and fetch the user name and other details.

java arrays bytearrayoutputstream

edited Jan 4 at 12:00

Alex Shesterov

15.8k94771

asked Jan 4 at 11:53

Shubham Sahay

507

edited Jan 4 at 12:00

Alex Shesterov

15.8k94771

asked Jan 4 at 11:53

Shubham Sahay

507

edited Jan 4 at 12:00

Alex Shesterov

15.8k94771

edited Jan 4 at 12:00

Alex Shesterov

15.8k94771

edited Jan 4 at 12:00

Alex Shesterov

15.8k94771

asked Jan 4 at 11:53

Shubham Sahay

507

asked Jan 4 at 11:53

Shubham Sahay

507

asked Jan 4 at 11:53

Shubham Sahay

507

2

Possible duplicate of How to read a large text file line by line using Java?

– Alex Shesterov
Jan 4 at 12:00

have you tried to use toByteArray?

– Leonardo Alves Machado
Jan 4 at 12:03

@LeonardoAlvesMachado yes not working...could you suggest if you have a way to use it.

– Shubham Sahay
Jan 4 at 12:26

The proper way would be to not have the ByteArrayOutputStream at all, but instead wrap the file input stream in a CipherInputStream or otherwise a custom FilterInputStream, so it is decrypted while being read. There should be no need to read and decrypt the entire file to a byte array and then read it back.

– Mark Rotteveel
Jan 4 at 12:37

@ShubhamSahay I didn't quite understand why you are using an output class (used to write to streams, in your case) in order to read stuff. When I said to use toByteArray, I meant to give you the data that it contains, so you could use it in an input class (used to read data) of your choice... If you couldn't get the data from it, you might be able to get it from the variable outputBytes in your code.

– Leonardo Alves Machado
Jan 4 at 12:57

|
show 2 more comments

2

Possible duplicate of How to read a large text file line by line using Java?

– Alex Shesterov
Jan 4 at 12:00

have you tried to use toByteArray?

– Leonardo Alves Machado
Jan 4 at 12:03

@LeonardoAlvesMachado yes not working...could you suggest if you have a way to use it.

– Shubham Sahay
Jan 4 at 12:26

The proper way would be to not have the ByteArrayOutputStream at all, but instead wrap the file input stream in a CipherInputStream or otherwise a custom FilterInputStream, so it is decrypted while being read. There should be no need to read and decrypt the entire file to a byte array and then read it back.

– Mark Rotteveel
Jan 4 at 12:37

@ShubhamSahay I didn't quite understand why you are using an output class (used to write to streams, in your case) in order to read stuff. When I said to use toByteArray, I meant to give you the data that it contains, so you could use it in an input class (used to read data) of your choice... If you couldn't get the data from it, you might be able to get it from the variable outputBytes in your code.

– Leonardo Alves Machado
Jan 4 at 12:57

Possible duplicate of How to read a large text file line by line using Java?

– Alex Shesterov
Jan 4 at 12:00

have you tried to use toByteArray?

– Leonardo Alves Machado
Jan 4 at 12:03

@LeonardoAlvesMachado yes not working...could you suggest if you have a way to use it.

– Shubham Sahay
Jan 4 at 12:26

The proper way would be to not have the ByteArrayOutputStream at all, but instead wrap the file input stream in a CipherInputStream or otherwise a custom FilterInputStream, so it is decrypted while being read. There should be no need to read and decrypt the entire file to a byte array and then read it back.

– Mark Rotteveel
Jan 4 at 12:37

@ShubhamSahay I didn't quite understand why you are using an output class (used to write to streams, in your case) in order to read stuff. When I said to use toByteArray, I meant to give you the data that it contains, so you could use it in an input class (used to read data) of your choice... If you couldn't get the data from it, you might be able to get it from the variable outputBytes in your code.

– Leonardo Alves Machado
Jan 4 at 12:57

|
show 2 more comments

1 Answer
1

active

oldest

votes

To read a byte you can use

ByteArrayInputStream in = new ByteArrayInputStream(outputBytes);

and to read this as lines of text you can use

BufferedReader br = new BufferedReader(new InputStreamReader(in));

for (String line; (line = br.readLine()) != null; ) {

    // do something with the line

}

answered Jan 4 at 12:35

Peter Lawrey

450k56576980

add a comment |

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

To read a byte you can use

ByteArrayInputStream in = new ByteArrayInputStream(outputBytes);

and to read this as lines of text you can use

BufferedReader br = new BufferedReader(new InputStreamReader(in));

for (String line; (line = br.readLine()) != null; ) {

    // do something with the line

}

answered Jan 4 at 12:35

Peter Lawrey

450k56576980

add a comment |

To read a byte you can use

ByteArrayInputStream in = new ByteArrayInputStream(outputBytes);

and to read this as lines of text you can use

BufferedReader br = new BufferedReader(new InputStreamReader(in));

for (String line; (line = br.readLine()) != null; ) {

    // do something with the line

}

answered Jan 4 at 12:35

Peter Lawrey

450k56576980

add a comment |

To read a byte you can use

ByteArrayInputStream in = new ByteArrayInputStream(outputBytes);

and to read this as lines of text you can use

BufferedReader br = new BufferedReader(new InputStreamReader(in));

for (String line; (line = br.readLine()) != null; ) {

    // do something with the line

}

answered Jan 4 at 12:35

Peter Lawrey

450k56576980

To read a byte you can use

ByteArrayInputStream in = new ByteArrayInputStream(outputBytes);

and to read this as lines of text you can use

BufferedReader br = new BufferedReader(new InputStreamReader(in));

for (String line; (line = br.readLine()) != null; ) {

    // do something with the line

}

answered Jan 4 at 12:35

Peter Lawrey

450k56576980

answered Jan 4 at 12:35

Peter Lawrey

450k56576980

answered Jan 4 at 12:35

Peter Lawrey

450k56576980

answered Jan 4 at 12:35

Peter Lawrey

450k56576980

add a comment |

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