如何从数据库中检索图像并将其显示在div上

Question

I am new to the blob data conversion of content. I am reading the emails and saving into database with body type as BLOB , if we have image embed into email even those are saving into it. but the problem is retrieving back and showing it to users. The image re-creation is not happening it says image path failed.

the src in image tag would be something like this.

cid:image001.png@01CF630F.005FA080

Please help with the suitable java code which 'll form image back and we can show into the division .

thanks in advance.

Answer 1

I have solved same problem, by making a sevlet that returns the byte[] of the image. And call this servlet within the img src tag.

Example : This method will give you byte[] for any file, and method is in Utilities class

public static byte[] getFileData ( String fileName ){
    File f = new File(fileName);
    byte data [] = new byte[ (int) f.length() ];

    try {
        FileInputStream fis = new FileInputStream(f);
        fis.read(data);
        fis.close();
        return data;
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return null;
}**

and I have called this method from doGet of the servlet as following:

final String imageName = request.getParameter("imageName");    
byte[] imageData = Utilities.getFileData( ROOT_DIR + imageName );
response.getOutputStream().write(imageData);

In above code ROOT_DIR is also defined as C:\\Temp\\FormData\\Images\\

My div is like this:

<div>
<img src='http://localhost:9080/LoadImage?imageName=one.png' />
</div>