Question

I want to save my file on Oracle Instance. I am using Hibernate for data objects. How can I insert files into Oracle Blob. Is there any sample code for this?

Answer 1

In first you must annotate your entity field with @javax.persistance.Lob annotation.
Like this:

public class InfoMessage {

    private byte[] body;

    @Lob
    public byte[] getBody() {
        return body;
    }

    public void setBody(byte[] body) {
        this.body = body;
    }
}

and set it with bytes array. It’s depends on wich File class you use. The first google result for java.io.File. I guess there’s better solution for this operation.

public static byte[] getBytesFromFile(File file) throws IOException {
    InputStream is = new FileInputStream(file);
// Get the size of the file
long length = file.length();

if (length > Integer.MAX_VALUE) {
    // File is too large
}

// Create the byte array to hold the data
byte[] bytes = new byte[(int)length];

// Read in the bytes
int offset = 0;
int numRead = 0;
while (offset < bytes.length
       && (numRead=is.read(bytes, offset, bytes.length-offset)) >= 0) {
    offset += numRead;
}

// Ensure all the bytes have been read in
if (offset < bytes.length) {
    throw new IOException("Could not completely read file "+file.getName());
}

// Close the input stream and return bytes
is.close();
return bytes;

}