Java IOException while trying to copy inputstream to outputstream

Question

I'am trying to write the inputstream image to OutputStream to display the image in the browser this is the code:

try
{
    InputStream input = Filer.readImage("images/test.jpg");
    byte[] buffer = new byte[1024];
    int bytesRead;
    while ((bytesRead = input.read(buffer)) != -1)
    {
        responseBody.write(buffer, 0, bytesRead);
    }
}
catch(IOException e)
{
    System.out.println(e);
}

the readImage:

public static InputStream readImage(String file) throws IOException {
    try (InputStream input = new FileInputStream(file)) {

        return input;
    }
}

but I get an error while writing:

java.io.IOException: Stream Closed

any ideas?

Sotirios Delimanolis · Accepted Answer · 2013-12-17 18:53:07Z

5

The try-with-resources closes the stream when you exit the block

try (InputStream input = new FileInputStream(file)) {

ie. when your method returns.

Just remove it and take care of closing the stream at the end of your other method body.

As stated in the comments, here's a link to the official tutorial on try-with-resources.

edited Dec 17, 2013 at 18:53

answered Dec 17, 2013 at 18:08

Sotirios Delimanolis

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1 Comment

Jonathan Drapeau Over a year ago

The link to the doc would be nice to have in your answer.

Al Sweetman · Accepted Answer · 2013-12-17 18:15:41Z

1

Taken from oracle tutorial the resource is closed when the statement completes:

The try-with-resources statement ensures that each resource is closed at the end of the statement. Any object that implements java.lang.AutoCloseable, which includes all objects which implement java.io.Closeable, can be used as a resource.

Prior to Java SE 7, you can use a finally block to ensure that a resource is closed regardless of whether the try statement completes normally or abruptly. The following example uses a finally block instead of a try-with-resources statement:

answered Dec 17, 2013 at 18:15

Al Sweetman

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