java下载linux服务器根路径上的一张图片到本地java代码

你可以使用Java的URLConnection和InputStream来下载文件。以下是一个示例代码：

import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;

public class DownloadImage {
    public static void main(String[] args) {
        String imageUrl = "http://example.com/image.jpg";
        String destinationFile = "/path/to/save/image.jpg";

        try {
            URL url = new URL(imageUrl);
            URLConnection connection = url.openConnection();
            InputStream inputStream = connection.getInputStream();
            byte[] buffer = new byte[1024];
            int length;
            FileOutputStream outputStream = new FileOutputStream(destinationFile);
            while ((length = inputStream.read(buffer)) != -1) {
                outputStream.write(buffer, 0, length);
            }
            outputStream.close();
            inputStream.close();
            System.out.println("Image downloaded successfully!");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

请将imageUrl替换为要下载的图像的URL，并将destinationFile替换为要将图像保存到的本地路径。