grails - 在GSP中显示图片

Question

我正在尝试显示在数据库中保存为GSP中BLOB的图像，但是没有显示，这是我的代码:

域:

  class Photos {
   Date dateCreated
   byte [] photo
   Date lastUpdated

  }
   static mapping ={ photo(sqlType:"BLOB") }
 }

Controller :

def display()
{
    def photosInstance = Photos.get(1).photo  
    byte [] image =params.photos // byte array
    response.setHeader('Content-length', "${image.length}"
    response.contentType = 'image/jpeg' // or the appropriate image content type
    response.outputStream << image
    response.outputStream.flush()

}

GSP:

<g:each var="img" in="${photosInstance}">
<img src="${createLink(action: 'display', params:[photos:"${img}"])}">
</g:each>

这是链接:

http://localhost:8080/myApp/ads/display?photos=%5B65%2C+110%2C+100%2C+114%2C+111%2C+105%2C+100%2C+49%2C+46%2C+106%2C+112%2C+103%5D

这是 View :



有什么线索吗？

Answer 1

def display() {
    def photosInstance = Photos.get(params.id)
    response.contentType = 'image/jpeg'
    response.contentLength = photosInstance.photo.size()
    OutputStream out = response.outputStream
    out.write(photosInstance.photo)
    out.close()
}

似乎您在“照片”域中具有一个照片属性，因此无需GSP中的循环，除非您有“照片”列表:

<img src="${createLink(action: 'display', id:photosInstance.ident())}">