CODEWITHSUNDEEP
javaspring-mvcspring-boot
MaxPower
MaxPower

Reputation: 871

Trying to get image from Spring

My HTML file has the following command

<img src="/5/background" alt="" width="192" height="192">

Which I have bound to the following inside a @RestController in a Spring Boot application:

@RequestMapping(value = "/{connector}/background", method = RequestMethod.GET)
public File getConnectorBackgroundImage(@PathVariable("connector") int connector)
{
    File image = new File("folder" + connector + "/myPicture");
    return image;
}

I have done my debugging and I know the method is being entered, and I know the path is correct, but all that shows is the icon in the browser when there is a problem loading a picture.

What else am I missing?

Upvotes: 0

Views: 81

Answers (1)

Dimitri Mestdagh
Dimitri Mestdagh

Reputation: 44745

Spring does not know how to handle the file that way. If you return a File, the controller will simply show you the path to the file if you call the REST API.

The proper way to do it is to read the file as a byte[]. Using commons-io you could come up with something like this:

File image = new File("folder" + connector + "/myPicture");
FileInputStream input = null;
try {
    input = new FileInputStream(image);
    return IOUtils.toByteArray(input);
} finally {
    IOUtils.closeQuietly(input);
}

Another thing you shouldn't forget is to provide the mimetype. To do that you tweak the @RequestMapping annotation a bit by providing the produces property:

@RequestMapping(value = "/{connector}/background", method = RequestMethod.GET, produces = MediaType.IMAGE_PNG_VALUE)

This should do the trick.

EDIT: Didn't notice the comments, you already fixed it by yourself.

Upvotes: 1

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