Java通过URL类下载图片的实例代码

httpsURLConnection HttpsURLConnection = null;
        InputStream is = null;
        FileOutputStream fos = null;
        try {
            //1.创建URL对象
            URL url = new URL("/file/imgs/upload/202302/22/23vwdkbnjob.jpg"));
            //4.输出图片
            byte[] buffer = new byte[1024];
            int len;
            while ((len = is.read(buffer)) != -1) {
                fos.write(buffer, 0, len);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            //5.关闭资源
            try {
                if (is != null)
                    is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                if (fos != null)
                    fos.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (httpsURLConnection != null)
                httpsURLConnection.disconnect();
        }

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

public class ImageDownloader {
    public static void main(String[] args) throws Exception {
        // URL of the image to download
        String imageUrl = "https://example.com/image.jpg";
        
        // Create URL object and open input stream to the image
        URL url = new URL(imageUrl);
        InputStream inputStream = url.openStream();
        
        // Output stream to save the image to file
        FileOutputStream outputStream = new FileOutputStream("image.jpg");
        
        // Read bytes from the input stream and write to the output stream
        byte[] buffer = new byte[2048];
        int length;
        while ((length = inputStream.read(buffer)) != -1) {
            outputStream.write(buffer, 0, length);
        }
        
        // Close streams
        inputStream.close();
        outputStream.close();
        
        System.out.println("Image downloaded successfully.");
    }
}

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

public class ImageDownloader {
    public static void main(String[] args) throws Exception {
        // URL of the image to download
        String imageUrl = "https://example.com/image.jpg";
        
        // Create URL object and open input stream to the image
        URL url = new URL(imageUrl);
        InputStream inputStream = url.openStream();
        
        // Output stream to save the image to file
        FileOutputStream outputStream = new FileOutputStream("image.jpg");
        
        // Read bytes from the input stream and write to the output stream
        byte[] buffer = new byte[2048];
        int length;
        while ((length = inputStream.read(buffer)) != -1) {
            outputStream.write(buffer, 0, length);
        }
        
        // Close streams
        inputStream.close();
        outputStream.close();
        
        System.out.println("Image downloaded successfully.");
    }
}

    imageUrl = URLEncoder.encode(imageUrl, "utf-8")
            .replaceAll("%3A", ":")
            .replaceAll("%2F", "/")
            .replaceAll("%2C", ",")
            .replaceAll("%7B", "{")
            .replaceAll("%3F","?")
            .replaceAll("%7D", "}")
            .replaceAll("%26","&")
            .replaceAll("%3D","=");
    //new一个URL对象
    URL url = new URL(imageUrl);