Question

File heduiFile = ExportImage.saveCompoentImage(fileName, poker480JPanel1.getjPanel1(), poker480JPanel1); OutputStream out = new FileOutputStream(new File("C:\\a.jpg")); out.write(heduiFile); out.close();

我想将heduiFile保存为JPG格式。但我仍然无法得到图像？

Answer 1

我这样做的一种方法是使用这个小的Java方法（下面），它在提供的Swing组件中获取图像，并将其保存到本地文件系统中提供的所需路径和文件名。图像以提供的文件名末尾的扩展名指定的格式保存。如果所需文件名为MyImage.jpg，则该文件将另存为 JPG 文件。如果文件名为MyImage.png，则图片会另存为包含Alpha通道的 PNG 文件。该方法支持以下图像格式： GIF ， PNG ， JPEG ， JPG ， BMP 和 WBMP ：

/**
 * Saves the image contained within a Swing component to the local file system. If 
 * the image file already exists within the supplied path then that file is overwritten.<br>
 * 
 * @param component (JComponent) The Swing Component to get the Image Icon from (ie: JLabel, etc).<br>
 * 
 * @param saveToFilePath (String) The full path and file name of where to save the image file. 
 * The file name must contain one of the following file name image extensions: .gif, .jpeg, 
 * .jpg, .bmp, .wbmp, .png. If the file name provided does not contain a file name extension 
 * then .png is used by default.<br> 
 * 
 * @throws IOException
 */
public void saveComponentImage(JComponent component, String saveToFilePath) throws IOException {
    String imageType;
    String ext = saveToFilePath.substring(saveToFilePath.lastIndexOf(".")).toLowerCase();
    String allowableExtentions = ".gif .jpg .jpeg .png .bmp .wbmp";
    imageType = allowableExtentions.contains(ext) ? ext.substring(1) : "png";
    int rgbType = imageType.equals("png") ? BufferedImage.TYPE_INT_ARGB : BufferedImage.TYPE_INT_RGB;

    BufferedImage img = new BufferedImage(component.getWidth(), component.getHeight(), rgbType);
    Graphics2D g2d = img.createGraphics();
    component.printAll(g2d);
    g2d.dispose();
    File outputfile = new File(saveToFilePath);
    ImageIO.write(img, imageType, outputfile);
}

这可能就是你如何使用这种方法：

try { saveComponentImage(jLabel1, "C:\\Pictures\\Some_Image.jpg"); }
catch (IOException ex) { ex.printStackTrace(); }

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