Question

在搜索类似问题后，我想问下列问题：

我正在尝试从Google静态地图加载图片，但我收到此错误：Exception in thread "main" java.lang.IllegalArgumentException: input == null! at javax.imageio.ImageIO.read(Unknown Source) at MapPicturePanel.main(MapPicturePanel.java:18)

以下是此课程的完整代码：

 import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.*;

public class MapPicturePanel {
    private JScrollPane getContent(BufferedImage image) {
        ImageIcon icon = new ImageIcon(image);
        JLabel label = new JLabel(icon);
        label.setHorizontalAlignment(JLabel.CENTER);
        return new JScrollPane(label);
    }

    public static void main(String[] args) throws IOException {
        String path = "http://maps.googleapis.com/maps/api/staticmap?center=37.426616,-122.176380&zoom=14&size=800x600&scale=2&format=jpg&maptype=hybrid&sensor=false";
        URL url = MapPicturePanel.class.getResource(path);
        BufferedImage image = ImageIO.read(url);
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setContentPane(new MapPicturePanel().getContent(image));
        f.setSize(800,800);
        f.setLocation(200,200);
        f.setVisible(true);
    }
}

Answer 1

您正试图在类路径中找到资源（这是Class.getResource所做的）。但看起来你想从外部网址加载图片。

就这样做

BufferedImage image  - ImageIO.read(new URL(path));

尝试使用ImageIO.read加载图像时出错

1 个答案: