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Displaying image in GSP (Grails), get link from database

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抹茶落季
抹茶落季 2021-01-03 09:20

I\'m a Grails newbie. I\'m trying to show an images thumbnail for every product in a site, like this:
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4条回答
  • 猫巷女王i
    2021-01-03 09:48

    Wait a sec... If I read your question literally, you're trying something like this:

    <a href="#"><img src="${resource(dir:"images", 
        file: "${fieldValue(bean: productInstance, field: "image")} ") }"/></a>

    Well, that's convoluted and wrong. This should work:

    <a href="#"><img src="${fieldValue(bean: productInstance, field: "image")}"/></a>
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  • 不思量自难忘°
    2021-01-03 10:01

    The proper syntax to avoid a syntax errors would be:

    <img src="${resource(dir:'images', file:fieldValue(bean:productInstance, field:'image'))}" />

    But I recommend you write your own tagLib, because it is really very simple to write one and your GSPs will look much nicer if you are going to use this code a lot. You could easily write a tag that would be called something like: <product:image product='productInstance' /> and for extra usability you could make the tagLib output the link as well.

    The simplicity of writing tagLibs is really one of the best grails features in my opinion.

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  • 日久生厌
    2021-01-03 10:03

    I needed a secured solution that was made in combination of http://grails.asia/grails-example-application-simple-document-management-system and http://grails.asia/grails-render-images-on-the-fly-in-gsp . For that purpouse i used a Domain where i store the path of images, a gsp to show the images and a Controller to serve the images

    Domain:

    class Document {
String filename
String fullPath
Date uploadDate = new Date()
static constraints = {
    filename(blank:false,nullable:false)
    fullPath(blank:false,nullable:false)
}

    }

    Grails Server Page:

    <!DOCTYPE html>
<html>
    <head>
        <meta name="layout" content="main">
        <title>Document List</title>
    </head>
<body>

        <div class="content scaffold-list" role="main">
            <h1>Document List</h1>
        <g:if test="${flash.message}"><div class="message" role="status">${flash.message}</div></g:if>
            <table>
                <thead>
                    <tr>
                    <g:sortableColumn property="filename" title="Filename" />
                    <g:sortableColumn property="uploadDate" title="Upload Date" />
                    <g:sortableColumn property="Preview" title="Vista Previa" />
                </tr>
            </thead>
            <tbody>
                <g:each in="${documentInstanceList}" status="i" var="documentInstance">
                    <tr class="${(i % 2) == 0 ? 'even' : 'odd'}">
                        <td><g:link action="download" id="${documentInstance.id}">${documentInstance.filename}</g:link></td>
                        <td><g:formatDate date="${documentInstance.uploadDate}" /></td>
                        <td><g:img style="height:120px;width:120px;" uri="/doclist/images?id=${documentInstance.id}"  /></td>
                    </tr>
                </g:each>
            </tbody>
        </table>

        <div class="pagination">
            <g:paginate total="${documentInstanceTotal}" />
        </div>
    </div>
</body>
</html>

    Controller:

    import org.springframework.security.access.annotation.Secured
class DoclistController {

@Secured(['ROLE_ADMIN'])      
def list(){

    params.max = 10
    [documentInstanceList: Document.list(params), documentInstanceTotal: Document.count()]

    //render view: 'list'
}

@Secured(['ROLE_ADMIN'])      
def images(long id){
    Document documentInstance = Document.get(id)
    if ( documentInstance == null) {
        flash.message = "Document not found."
        redirect (action:'list')
    } else {

        def file = new File(documentInstance.fullPath)
        def fileInputStream = new FileInputStream(file)
        def outputStream = response.getOutputStream()
        byte[] buffer = new byte[4096];
        int len;
        while ((len = fileInputStream.read(buffer)) > 0) {
            outputStream.write(buffer, 0, len);
        }
        outputStream.flush()
        outputStream.close()
        fileInputStream.close()
    }
}
}

    I show the images of database as follows

    Hope this helps

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  • 误落风尘
    2021-01-03 10:08

    I save the image storagePath in Database like ../../../web- app/personImages/imageName.img extension using FileUploadService. For displaying images in GSP 

    <img style="height:120px;width:102px;"src="${resource(dir:'personImages',file:domainInstance.id + '.png')}" />

    Example

    First Use FileUploadSevices file

    Domain:

    class PersonalDetails {

String avatar

static constraints = {

    avatar(nullable:true,maxSize: 1024000)

}

    Controller save() action:

    // Save Avatar if uploaded
def avatarImage = request.getFile('avatar')
    if (!avatarImage.isEmpty()) {
    personalDetailsInstance.avatar = fileUploadService.uploadFile(avatarImage, 
       "${personalDetailsInstance.id}.png", "personImages")
        }

    DB file storage path:

    In avatar file :

    C:\Documents and Settings\Administrator\Documents\workspace-ggts-3.4.0.RELEASE\IDiary\web-app\personImages/1.png

    List GSP:

    <img style="height: 120px;width: 102px;"src="${resource(dir:'personImages', file: personalDetailsInstance.id + '.png')}" />
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