java - 仅打印（不是整个框架）java swings 中的标签

Question

检查下面的图片

条形码被添加为标签。单击“打印”后，我只需要打印条形码。我想怎么做。我看到的例子很少，但它们打印了整个框架，即包括框架上的打印按钮。

更新 现在我将打印到左上角。如何将它放置在我想要的任何位置

Answer 1

需要做的只是简单地Printable为单个Component.

这是一个基本的实现示例，可以对这个主题有所了解：

/**
 * Allows for printing a single UI component.
 * @author Ben Barkay
 */
public class ComponentPrinter implements Printable {
    /**
     * The component to be printed.
     */
    Component component;

    /**
     * The amount of pixels to shift the component to the right.
     */
    int translateX;

    /**
     * The amount of pixels to shift the component to the bottom.
     */
    int translateY;

    /**
     * Constructs a new <code>ComponentPrinter</code> for the specified component.
     * @param component     The component that this component printer will print.
     * @param translateX    The amount of pixels to move the component towards the right.
     * @param translateY    The amount of pixels to move the component towards the bottom.
     */
    public ComponentPrinter(Component component, int translateX, int translateY) {
        this.component = component;
        this.translateX = translateX;
        this.translateY = translateY;
    }

    /**
     * Prints the component of this <code>ComponentPrinter</code>.
     * {@inheritDoc}
     */
    @Override
    public int print(Graphics graphics, PageFormat format, int pageIndex)
            throws PrinterException {
        // We assume that there is only one page.
        if (pageIndex == 0) {
            // Position the component appropriately
            ((Graphics2D)graphics).translate(translateX, translateY);

            // Paints the component on the graphics that are about to be printed for this page.
            component.paint(graphics);
            return PAGE_EXISTS;
        }

        // We don't have a page other than the first page.
        return NO_SUCH_PAGE;
    }
}

它的用法是这样的：

JLabel yourJLabelHere = null;
int moveToTheRight = 100;
int moveToTheBottom = 50;
PrinterJob printJob = PrinterJob.getPrinterJob();
printJob.setPrintable(new ComponentPrinter(yourJLabelHere, moveToTheRight, moveToTheBottom));
if (printJob.printDialog()) {
    try { 
        printJob.print();
    } catch(PrinterException pe) {
        System.out.println("Error printing: " + pe);
    }
}