java怎么实现文件下载功能

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在 Java 中可以通过使用 URLConnection 类来实现文件下载功能。以下是一个简单的示例代码：

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

public class FileDownload {public static void main(String[] args) {String fileUrl = "http://example.com/file.zip";
        String outputFilePath = "file.zip";

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

            FileOutputStream outputStream = new FileOutputStream(outputFilePath);

            byte[] buffer = new byte[4096];
            int bytesRead = -1;

            while ((bytesRead = inputStream.read(buffer)) != -1) {outputStream.write(buffer, 0, bytesRead);
            }

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

            System.out.println("File downloaded successfully!");
        } catch (Exception e) {e.printStackTrace();
        }
    }
}