如何从javafx imageView获取byte []？

问题描述

如何从javafx image / imageview类获取byte []？我想将我的图像作为Blob存储到我的数据库中。这是我用它的方法

  public PreparedStatement prepareQuery（ HSQLDBConnector连接器）{
 try {
 Blob logoBlob = connector.connection.createBlob（）; 
 logoBlob.setBytes（0，logo.getImage（））; //卡在这里
 for（int i = 0，a = 1; i< data.length; i ++，a ++）{
 
 connector.prepStatCreateProfile.setString（a，data [i]）; 
 
} 
 //存储LOB 
 
 connector.prepStatCreateProfile.setBlob（11，logoBlob）; 
 
} catch（SQLException ex）{
 ex.printStackTrace（）; 
} 
 return connector.prepStatCreateProfile; 
} 
  

有没有办法从我当前的对象转换（imageview） ，图像）到byte [] ?,或者shoud我开始考虑使用其他类作为我的图像/或者指向带引用的位置并使用路径/网址？

  BufferedImage bImage = SwingFXUtils.fromFXImage （logo.getImage（），null）; 
 ByteArrayOutputStream s = new ByteArrayOutputStream（）; 
 ImageIO.write（bImage，png，s）; 
 byte [] res = s.toByteArray（）; 
 s.close（）; //尤其是在使用不同的输出流时。 
  

应该根据徽标类别工作

你需要在写和读时指定一种格式，并且据我记得bmp不受支持，所以你最终会在数据库上找到一个png字节数组

How do i get byte[] from javafx image/imageview class? I want to store my image as a Blob into my database.This is the method that i use for it

 public PreparedStatement prepareQuery(HSQLDBConnector connector) {
        try {
            Blob logoBlob = connector.connection.createBlob();
            logoBlob.setBytes(0,logo.getImage());//stuck  here
            for (int i = 0, a = 1; i < data.length; i++, a++) {

                connector.prepStatCreateProfile.setString(a, data[i]);

            }
            //store LOB

            connector.prepStatCreateProfile.setBlob(11, logoBlob);

        } catch (SQLException ex) {
            ex.printStackTrace();
        }
        return connector.prepStatCreateProfile;
    }

Is there a way to convert from my current object (imageview),image) into byte[]?, or shoud i start to think about using other class for my image/ alternatively point to the location with reference and work with paths/urls?

解决方案

try this one:

BufferedImage bImage = SwingFXUtils.fromFXImage(logo.getImage(), null);
ByteArrayOutputStream s = new ByteArrayOutputStream();
ImageIO.write(bImage, "png", s);
byte[] res  = s.toByteArray();
s.close(); //especially if you are using a different output stream.

should work depending on the logo class

you need to specify a format while writing and reading, and as far as I remember bmp is not supported so you will end up with a png byte array on the database

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