Question

hi i am building a dynamic web project in which the welcome page have struts2 file tag now i want to store that specified file to mysql database would some one help me…

Thanks in advance.

Here is the Code i developed but it takes the file parameter statically means manually i am specifying path. but it should take path from the struts 2 file tag see the java class u will get it..

public class FileUploadACtion 
{

    public String execute() throws IOException
{
System.out.println("Hibernate save image into database");
    Session session = HibernateUtil.getSessionFactory().openSession();

    session.beginTransaction();

    //save image into database
    File file = new File("C:\\mavan-hibernate-image-mysql.gif");
    byte[] bFile = new byte[(int) file.length()];

    try {
     FileInputStream fileInputStream = new FileInputStream(file);
     //convert file into array of bytes
     fileInputStream.read(bFile);
     fileInputStream.close();
    } catch (Exception e) {
     e.printStackTrace();
    }

    FileUpload tfile = new FileUpload();
    avatar.setImage(bFile);

    session.save(tfile);

    //Get image from database
    FileUpload tfile2 =         (FileUpload)session.get(FileUpload.class,FileUpload.getAvatarId());
    byte[] bAvatar = avatar2.getImage();
    try{
        FileOutputStream fos = new FileOutputStream("C:\\test.gif"); 
        fos.write(bAvatar);
        fos.close();
    }catch(Exception e){
        e.printStackTrace();
    }

    session.getTransaction().commit();
}

}

Answer 1

You should be storing the image in the table as a BLOB type. Lets assume you have a Person class with the an image of the person stored in the DB. If you want to map this, just add a property in your person POJO that holds the image.

@Column(name="image")
@Blob
private Blob image;

When you display it, convert it to a byte[] and show.

private byte[] toByteArray(Blob fromImageBlob) {
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    try {
      return toByteArrayImpl(fromImageBlob, baos);
    } catch (Exception e) {
    }
    return null;
  }



private byte[] toByteArrayImpl(Blob fromImageBlob, 
      ByteArrayOutputStream baos) throws SQLException, IOException {
    byte buf[] = new byte[4000];
    int dataSize;
    InputStream is = fromImageBlob.getBinaryStream(); 

    try {
      while((dataSize = is.read(buf)) != -1) {
        baos.write(buf, 0, dataSize);
      }    
    } finally {
      if(is != null) {
        is.close();
      }
    }
    return baos.toByteArray();
  }

You can see the below examples to know more about it.

1. http://i-proving.com/space/Technologies/Hibernate/Blobs+and+Hibernate
2. http://snehaprashant.blogspot.com/2008/08/how-to-store-and-retrieve-blob-object.html
3. http://viralpatel.net/blogs/2011/01/tutorial-save-get-blob-object-spring-3-mvc-hibernate.html