Question

大家好我想在我的JFrame上显示网址中的图片，但它不起作用。以下是代码：注意MYJ是名称我的JLabel。我已经在这里展示了一个教程，但是当我尝试使用它时，它会显示在已经创建的单独标签上。

    import java.awt.Image;
    import java.io.IOException;
    import java.net.URL;
    import javax.imageio.ImageIO;
    import javax.swing.ImageIcon;
    import javax.swing.JLabel;


    public class MYPIX extends javax.swing.JFrame {
    public void myFrame (){

    }

    /**
     * Creates new form MYPIX
     */
    public MYPIX() {
        initComponents();

            Image image = null;
        try {
            URL url = new URL("http://i.imgur.com/xiVXrCD.jpg");
            image = ImageIO.read(url);
        } catch (IOException e) {
            e.printStackTrace();

                 ImageIcon I22 = new ImageIcon();
                        MYJ.setIcon(I22);
        }

    }

     public static void main(String args[]) {

    java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new MYPIX().setVisible(true);
            }
        });
    }
     private javax.swing.JLabel MYJ;
    // End of variables declaration                   
    }

Answer 1

你的异常块只有在出现问题时才会出现，而是在try块内，你应该在成功加载后设置标签的图标属性（因为在read期间没有出现错误进程，try块中的以下行可以执行

 URL url = new URL("http://i.imgur.com/xiVXrCD.jpg");
 image = ImageIO.read(url);
 MYJ.setIcon(new ImageIcon(image));

不要忘记将JLabel添加到框架中。

您可能还希望阅读Code Conventions for the Java TM Programming Language，这样可以让人们更轻松地阅读您的代码并让您阅读其他代码

Answer 2

以下是正在运行的更新代码：

    private void extractFolder(String zipFile, String extractFolder)
{
    try
    {
        int BUFFER = 2048;
        File file = new File(zipFile);

        ZipFile zip = new ZipFile(file);
        String newPath = extractFolder;

        new File(newPath).mkdir();
        Enumeration zipFiles = zip.entries();

        while (zipFiles.hasMoreElements())
        {

            ZipEntry entry = (ZipEntry) zipFiles.nextElement();
            String currentEntry = entry.getName();

            File destFile = new File(newPath, currentEntry);
            // destFile = new File(newPath, destFile.getName());
            File destinationParent = destFile.getParentFile();

            // create the parent directory structure if needed
            destinationParent.mkdirs();

            if (!entry.isDirectory())
            {
                BufferedInputStream inputSteam = new BufferedInputStream(zip.getInputStream(entry));
                int currentByte;
                // init buffer
                byte data[] = new byte[BUFFER];

                FileOutputStream outStream = new FileOutputStream(destFile);
                BufferedOutputStream bufferedOutSteam = new BufferedOutputStream(outStream, BUFFER);

                while ((currentByte = inputSteam.read(data, 0, BUFFER)) != -1)
                {
                    bufferedOutSteam.write(data, 0, currentByte);
                }

                bufferedOutSteam.flush();
                outStream.flush();

                bufferedOutSteam.close();
                inputSteam.close();
                outStream.close();
            }

        }
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }

}

Answer 3

try {
    BufferedImage img = ImageIO.read(new URL("http://1821662466.rsc.cdn77.org/images/google_apps_education.jpg"));
    imgLabel.setIcon(new javax.swing.ImageIcon(img));

}
catch(IOException ex) {

}

你可以试试这个方法

如何将我的图像从URL显示到我的JLabel（JFrame）

3 个答案: