Display byte array in gsp

Question

I want to loop through this class and display in a table. what is the easiest way to display the image?

class Crop {
    static hasMany = [diseases: Disease]
    int id
    String commonName
    String scientificName
    byte[] image
}

static mapping = {
    table: 'Crops'
    commonName length : 100
    scientificName length: 100
    image sqlType: "longblob"
}

Normally you would do an extra request for each image which are handled by a controller. Do you really have to do this inside gsp? And maybe you should accept some of your earlier questions first? — micha
– micha, Commented Dec 22, 2012 at 10:15

Gareth Davis · Accepted Answer · 2012-12-22 11:33:49Z

2

You can if you don't mind the lack of browser compatablity use data: uri encoding:

<img src="data:image/png;base64,${crop.image.encodeBase64()}"/>

see the Wikipedia page on Data URI encoding scheme

@Xeon suggest the more conventional approach, ie create a controller that returns an image response with the correct mime type and the byte array as the body.

answered Dec 22, 2012 at 11:33

Gareth Davis

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Community · Accepted Answer · 2017-05-23 10:24:45Z

1

You could do the same thing as in this answer.

Or you can create controller which provide image data stream from your entity. On GSP you could write:

<img src="${request.contextPath}/imageController/actionName?id=${entity.id}" ...

But this is unusual - storing images in entities as byte[]. You should consider changing it to String which would indicate a path/filename of the image.

edited May 23, 2017 at 10:24

CommunityBot

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answered Dec 22, 2012 at 11:26

Xeon

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1 Comment

Gareth Davis Over a year ago

I wouldn't say storing images in the DB is unusual, I've seen it used on numerous occasions, and to be honest is usual a good first choice for a lot of applications.

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