Letícia Álvares Barbalho wrote:
Hello, everyone.
I have an app which uses struts + hibernate. I was having a problem of
corrupted blobs (which are treated by the app as byte[]), and so far I was
blaming hibernate for that. But right now, making a test, I found out that
my data gets corrupted BEFORE even being treated by hibernate. Here's what I
have:
1. A jsp page that gets a String using html:text, property = descricao
2. An action form that has the descricao property as a byte[], together with
its getters and setters
3. An action that takes data from this action form and puts it in my object,
which by the way also has this property as a byte[], with its getters and
setters.
So, what I wanna do is get this String and put in a blob field. Here comes
my action code:
cor.setCor(addCorForm.getCor());
cor.setNome(addCorForm.getNome());
cor.setDescricao(addCorForm.getDescricao());
CorService.getInstance().addCor(cor);
That's basically it: I set the properties and add. The thing is that if I
get the byte[] value of addCorForm.getDescricao() and convert it to a
string, it gives me NULL or a lot of weird characters. That means my data is
getting corrupted right there, before its insertion.
Another proof of it, is that if I insert a line in this table using the
database's tool, I can retrieve the information through my application.
So... database tool = correct data. App = incorrect data, even before adding
the object in the DB with hibernate. What I can think here is struts is
corrupting... could it be?
1. Is html:text the correct component I have to use for this?
2. Do I have to make any conversion, being that I insert a String and it
gets a byte[]?
How do you guys do it? Thank you all very much for the help
You need to thing about what happens when your form is submitted:
1) the browser serializes the text into the HTTP request, using encoding X
2) the servlet container reads the HTTP request and deserializes the
text into the request object, using encoding Y
3) Struts copies the text into the form bean via BeanUtils, using encoding Z
4) you copy the bytes from the form bean into your database
If X and Y are different, you'll get corrupted data. If encoding Z is
not what you're expecting (i.e. doesn't match whatever character set
you're expecting data stored in your Blob column to use), you'll get
corrupted data.
I would suggest you start by making sure that 1 and 2 are right (try
getting the text value directly from the request and comparing it to a
known-good String value). There's a number of ways you can get tripped
up trying to deal with non-Latin-1 data over HTTP.
Once you have that working, you can look at 3. Take your now known-good
request string, encode it to a byte array using the encoding you need
and compare the result with the byte array Struts / BeanUtils stores in
your form bean.
Actually, I suspect that the String to byte[] conversion in BeanUtils
probably isn't doing what you need at all; I just had a quick look at
the code and I'm not sure quite what it's doing. You may have to change
your form bean to use String instead of byte[] and do the conversion
yourself in your action.
HTH,
L.
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