How to open a large file faster?
Hi,
I am developing a website which will host some documents. Size of the docuemnts are between 1MB to 10MB ans they are PDF documents. I open the document in a new page based on some inout parameters.
I am using the following code. But it takes long time to get displayed. Is there any other way of reading and displaying the file faster? Is it possible to use buffer reader here and make it faster? Please help.
OpenFileStream display =new OpenFileStream();
String fileName =request.getParameter("fileName");
display.displayFile(request,response,fileName);
The code which I sent is working. I do not know why you said it can not work.you call these methods
http://java.sun.com/j2se/1.4.2/docs/api/java/io/InputStream.html#read(byte[])
http://java.sun.com/j2se/1.4.2/docs/api/java/io/InputStream.html#available()
in this code int numOfBytes = fileInput.available();
byte byteArray[] = new byte[numOfBytes];
int totalBytes = reader.read(byteArray);In general its not guaranteed that fileInput.available() will return the number of bytes in the file. It returns how many bytes it can read before blocking. It says: "Returns the number of bytes that can be read (or skipped over) from this input stream without blocking by the next caller of a method for this input stream"
try adding byte byteArray[] = new byte[numOfBytes];
if(numOfBytes!=new File(fileName).length()) {
System.out.println(fileName+" has not been read correctly");
}to your code to see if this is happening.
Now I tried using the following code. Will it be
faster than previous code? I don't see why it would be - have you tried running it and timing it?
I still think the only (possibly very small) performance benefit you can get here is to overlap the reading and writing phases - so that you start reading the file, and writing it to the output stream at the same time.
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