java文件下载后删除文件代码实现

在Java中，你可以使用`java.io.File`类配合`java.nio.file.Files`来实现文件下载并下载完成后立即删除文件的操作。这里是一个简单的示例：

import java.io.*;
import java.net.URL;
import java.nio.file.Files;
import java.nio.file.Path;

public class FileDownloadDelete {
    public static void main(String[] args) throws IOException {
        // URL of the file you want to download
        String url = "http://example.com/file-to-download.zip";

        try (InputStream in = new URL(url).openStream();
             FileOutputStream fos = new FileOutputStream("downloaded_file.zip")) {

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

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

            fos.flush();
            System.out.println("File downloaded and saved as downloaded_file.zip");

        } finally {
            // Delete the file after download is complete
            Path filePath = Paths.get("downloaded_file.zip");
            if (Files.exists(filePath)) {
                Files.deleteIfExists(filePath);
                System.out.println("File deleted: downloaded_file.zip");
            } else {
                System.out.println("File not found for deletion.");
            }
        }
    }
}

这个代码首先从指定URL读取数据到内存缓冲区，然后写入到本地文件。当所有数据都写入完成后，尝试删除下载后的文件。