在表格中显示图像 [英] Display image in table

问题描述

我正在尝试将图像插入JavafX中的表视图中。以下是我设置表视图的方法：

I am trying to insert an image into table view in JavafX. Here is how I set up my table view:

TableColumn prodImageCol = new TableColumn("IMAGES");
    prodImageCol.setCellValueFactory(new PropertyValueFactory<Product, Image>("prodImage"));
    prodImageCol.setMinWidth(100);
    // setting cell factory for product image        
    prodImageCol.setCellFactory(new Callback<TableColumn<Product,Image>,TableCell<Product,Image>>(){        
        @Override
        public TableCell<Product,Image> call(TableColumn<Product,Image> param) {                
            TableCell<Product,Image> cell = new TableCell<Product,Image>(){
                    public void updateItem(Product item, boolean empty) {                        
                    if(item!=null){                            
                        ImageView imageview = new ImageView();
                        imageview.setFitHeight(50);
                        imageview.setFitWidth(50);
                        imageview.setImage(new Image(product.getImage()));
                    }
                }
            };
            return cell;
        }

    });        

 viewProduct.setEditable(false);
 viewProduct.getColumns().addAll(prodImageCol, prodIDCol, prodNameCol, prodDescCol, prodPriceCol, col_action);
 viewProduct.getItems().setAll(product.populateProductTable(category));

 private SimpleObjectProperty prodImage;

 public void setprodImage(Image value) {
    prodImageProperty().set(value);
}

public Object getprodImage() {
    return prodImageProperty().get();
}

public SimpleObjectProperty prodImageProperty() {
    if (prodImage == null) {
        prodImage = new SimpleObjectProperty(this, "prodImage");
    }
    return prodImage;
}

这就是我从数据库中检索图像的方式：

And this is how I retrieve the image from database:

 Blob blob = rs.getBlob("productImage");
 byte[] data = blob.getBytes(1, (int) blob.length());
 bufferedImg = ImageIO.read(new ByteArrayInputStream(data));
 image = SwingFXUtils.toFXImage(bufferedImg, null);

但是我在设置表视图时遇到错误：imageview.setImage（new Image（product .getImage（）））;
错误消息：

However I am getting error at the setting up of table view: imageview.setImage(new Image(product.getImage())); The error message as:

no suitable constructor found for Image(Image)
constructor Image.Image(String,InputStream,double,double,boolean,boolean,boolean) is not applicable
  (actual and formal argument lists differ in length)
constructor Image.Image(int,int) is not applicable
  (actual and formal argument lists differ in length)
constructor Image.Image(InputStream,double,double,boolean,boolean) is not applicable
  (actual and formal argument lists differ in length)
constructor Image.Image(InputStream) is not applicable
  (actual argument Image cannot be converted to InputStream by method invocation conversion)
constructor Image.Image(String,double,double,boolean,boolean,boolean) is not applicable
  (actual and formal argument lists differ in length)
constructor Image.Image(String,double,double,boolean,boolean) is not applicab...

我设法检索并显示了图像视图中的图像但是，我无法在表格列中显示它。任何帮助，将不胜感激。在此先感谢。

I did managed to retrieve and display an image inside an image view but however, I can't display it in table column. Any help would be appreciated. Thanks in advance.

推荐答案

导致异常的问题是您的方法 product.getImage（） 返回 javafx.scene.Image 。此时无需做任何其他事情：你有一个图像，所以使用它（在你尝试构建新图像（图像）之前 - 这甚至都不可能） ）。这就是你想要使用的：

The problem that's causing the exception is that your method product.getImage() is returning an javafx.scene.Image. There's no need to do anything else at this point: You have an image, so use it (before you were trying to construct new Image(Image) - which is not even possible). This is what you want to be using:

imageview.setImage(product.getImage());

您的第二个问题是，当您创建 ImageView 每次更新单元格时，你都没有做任何事情。这是您的原始代码：

Your second problem is that while you're creating an ImageView every time you update the cell, you're not doing anything with it. Here's your original code:

        TableCell<Product,Image> cell = new TableCell<Product,Image>(){
                public void updateItem(Product item, boolean empty) {                        
                if(item!=null){                            
                    ImageView imageview = new ImageView();
                    imageview.setFitHeight(50);
                    imageview.setFitWidth(50);
                    imageview.setImage(new Image(product.getImage()));
                }
            }
        };
        return cell;

像@tomsontom建议的那样，我建议使用 setGraphic（Node）附加 ImageView 到 TableCell 。所以你最终会得到这样的结果：

Like @tomsontom suggested, I'd recommend using setGraphic(Node) to attach your ImageView to the TableCell. So you might end up with something like this:

        //Set up the ImageView
        final ImageView imageview = new ImageView();
        imageview.setFitHeight(50);
        imageview.setFitWidth(50);

        //Set up the Table
        TableCell<Product,Image> cell = new TableCell<Product,Image>(){
                public void updateItem(Product item, boolean empty) {                        
                if(item!=null){
                    imageview.setImage(product.getImage());  //Change suggested earlier
                }
            }
        };

        // Attach the imageview to the cell
        cell.setGraphic(imageview) 
        return cell;

@tomsontom的第一点是你创建图像的方法有点迂回。当然，它似乎有效...但有一种更简单的方法。最初你使用的是：

The first point @tomsontom was making is that your method of creating an Image is a little roundabout. Sure, it seems to work... but there's a simpler way. Originally you were using:

 bufferedImg = ImageIO.read(new ByteArrayInputStream(data));
 image = SwingFXUtils.toFXImage(bufferedImg, null);

但更好的方法是用以下方式切换这些行：

But a better way of doing it would be switching those lines with:

 image = new Image(new ByteArrayInputStream(data));

这篇关于在表格中显示图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！