~~~ import java.io.*; import java.net.URLEncoder; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; @Controller public class File_Download { //实现Spring Boot 的文件下载功能，映射网址为/download @RequestMapping("/download") public String downloadFile(HttpServletRequest request, HttpServletResponse response) throws UnsupportedEncodingException { // 获取指定目录下的第一个文件 File scFileDir = new File("E://music_eg"); File TrxFiles[] = scFileDir.listFiles(); System.out.println(TrxFiles[0]); String fileName = TrxFiles[0].getName(); //下载的文件名 // 如果文件名不为空，则进行下载 if (fileName != null) { //设置文件路径 String realPath = "E://music_eg/"; File file = new File(realPath, fileName); // 如果文件名存在，则进行下载 if (file.exists()) { // 配置文件下载 response.setHeader("content-type", "application/octet-stream"); response.setContentType("application/octet-stream"); // 下载文件能正常显示中文 response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8")); // 实现文件下载 byte[] buffer = new byte[1024]; FileInputStream fis = null; BufferedInputStream bis = null; try { fis = new FileInputStream(file); bis = new BufferedInputStream(fis); OutputStream os = response.getOutputStream(); int i = bis.read(buffer); while (i != -1) { os.write(buffer, 0, i); i = bis.read(buffer); } System.out.println("Download the song successfully!"); } catch (Exception e) { System.out.println("Download the song failed!"); } finally { if (bis != null) { try { bis.close(); } catch (IOException e) { e.printStackTrace(); } } if (fis != null) { try { fis.close(); } catch (IOException e) { e.printStackTrace(); } } } } } return null; } } ~~~