java怎么下载文件到指定文件夹

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你可以使用 Java 的 URL 和URLConnection类来下载文件到指定文件夹。以下是一个简单的示例代码：

import java.io.*;
import java.net.URL;
import java.net.URLConnection;

public class DownloadFile {public static void main(String[] args) {String fileURL = "http://example.com/file.txt";
        String saveDir = "/path/to/save/directory";

        try {URL url = new URL(fileURL);
            URLConnection conn = url.openConnection();
            InputStream inputStream = conn.getInputStream();

            File saveDirFile = new File(saveDir);
            if (!saveDirFile.exists()) {saveDirFile.mkdirs();
            }

            String fileName = fileURL.substring(fileURL.lastIndexOf("/") + 1);
            String filePath = saveDir + File.separator + fileName;

            FileOutputStream outputStream = new FileOutputStream(filePath);

            int bytesRead;
            byte[] buffer = new byte[4096];
            while ((bytesRead = inputStream.read(buffer)) != -1) {outputStream.write(buffer, 0, bytesRead);
            }

            outputStream.close();
            inputStream.close();

            System.out.println("File downloaded to: " + filePath);

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