java怎么根据url下载图片

在Java中，可以使用URL和HttpURLConnection类来下载图片。以下是一个简单的示例代码：

import java.io.BufferedInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.URL;  public class ImageDownloader {     public static void main(String[] args) {         String imageUrl = "http://example.com/image.jpg";         String destinationPath = "C:/path/to/save/image.jpg";                  try {             URL url = new URL(imageUrl);             HttpURLConnection connection = (HttpURLConnection) url.openConnection();             connection.setRequestMethod("GET");                          InputStream inputStream = connection.getInputStream();             BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream);                          FileOutputStream fileOutputStream = new FileOutputStream(destinationPath);                          byte[] buffer = new byte[1024];             int bytesRead;             while ((bytesRead = bufferedInputStream.read(buffer)) != -1) {                 fileOutputStream.write(buffer, 0, bytesRead);             }                          fileOutputStream.close();             bufferedInputStream.close();                          System.out.println("Image downloaded successfully.");         } catch (IOException e) {             e.printStackTrace();         }     } } 

只需将imageUrl替换为要下载的图片的URL，将destinationPath替换为要保存图片的路径，运行代码即可下载图片。