Java WebAPI如何实现文件上传下载
导读:Java WebAPI可以通过使用Servlet来实现文件上传下载。以下是一个简单的示例: 文件上传 @WebServlet("/upload" @MultipartConfig public class FileUploadServ...
Java WebAPI可以通过使用Servlet来实现文件上传下载。以下是一个简单的示例:
- 文件上传
@WebServlet("/upload")
@MultipartConfig
public class FileUploadServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Part filePart = request.getPart("file");
String fileName = filePart.getSubmittedFileName();
InputStream fileContent = filePart.getInputStream();
// 保存文件到指定目录
File file = new File("C:/upload/" + fileName);
try (OutputStream out = new FileOutputStream(file)) {
IOUtils.copy(fileContent, out);
}
catch (IOException e) {
e.printStackTrace();
}
response.getWriter().println("文件上传成功");
}
}
- 文件下载
@WebServlet("/download")
public class FileDownloadServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String fileName = "example.txt";
File file = new File("C:/upload/" + fileName);
response.setContentType("application/octet-stream");
response.setHeader("Content-Disposition", "attachment;
filename=\"" + fileName + "\"");
try (InputStream in = new FileInputStream(file);
OutputStream out = response.getOutputStream()) {
IOUtils.copy(in, out);
}
catch (FileNotFoundException e) {
e.printStackTrace();
}
}
}
在以上示例中,通过MultipartConfig注解标记文件上传Servlet,并使用Part对象获取上传的文件,然后将文件保存到指定目录。在文件下载Servlet中,设置响应的Content-Type和Content-Disposition头,然后将文件内容写入到输出流中实现文件下载。
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