下载带有原始文件名的文件

在我的项目中，我正在上传文件。 在上传时，我将其原始文件名和扩展名保存在数据库中，并在服务器上保存带有一些GUID文件，生成的GUID也与文件名和扩展名一起存储在数据库中。

例如-

– 用于上传的文件名是questions.docx

– 然后orignalFileName将是“问题”

-FileExtension将是“.docx”

-File上传文件名为“0c1b96d3-af54-40d1-814d-b863b7528b1c”

上传工作正常..但是当我下载一些文件时，它会被下载文件名作为GUID，在上面的例子中是“0c1b96d3-af54-40d1-814d-b863b7528b1c”。
如何下载具有原始文件名的文件，即“questions.docx”。

已添加代码

  /** * code to display files on browser */ File file = null; FileInputStream fis = null; ByteArrayOutputStream bos = null; try { /** * C://DocumentLibrary// path of evidence library */ String fileName = URLEncoder.encode(fileRepo.getRname(), "UTF-8"); fileName = URLDecoder.decode(fileName, "ISO8859_1"); response.setContentType("application/x-msdownload"); response.setHeader("Content-disposition", "attachment; filename="+ fileName); String newfilepath = "C://DocumentLibrary//" + systemFileName; file = new File(newfilepath); fis = new FileInputStream(file); bos = new ByteArrayOutputStream(); int readNum; byte[] buf = new byte[1024]; try { for (; (readNum = fis.read(buf)) != -1;) { bos.write(buf, 0, readNum); } } catch (IOException ex) { } ServletOutputStream out = response.getOutputStream(); bos.writeTo(out); } catch (Exception e) { // TODO: handle exception } finally { if (file != null) { file = null; } if (fis != null) { fis.close(); } if (bos.size() <= 0) { bos.flush(); bos.close(); } } 

这段代码是完美的吗？

Answer 1

您应该将原始文件名设置为响应标头，如下所示：

 String fileName = URLEncoder.encode(tchCeResource.getRname(), "UTF-8"); fileName = URLDecoder.decode(fileName, "ISO8859_1"); response.setContentType("application/x-msdownload"); response.setHeader("Content-disposition", "attachment; filename="+ fileName); 

希望能帮到你:)

Answer 2

您只需从数据库中获取originalName并在Content-Disposition标头中设置它：

 @RequestMapping("/../download") public ... download(..., HttpServletResponse response) { ... response.setHeader("Content-Disposition", "attachment; filename=\"" + original + "\""); } 

Answer 3

您可以在标题中设置文件名。

比如说你正在使用RestFul Webservice，然后可以像这样使用ResponseBuilder ：

 ResponseBuilder rsp = Response.ok("Your Content Here", "application/docx"); rsp.setHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\""); 

/可以在运行时设置内容类型和文件名。

Answer 4

嗨@Amogh使用下面的代码

 response.setHeader("Content-Disposition", "attachment; filename="+FILENAME+".docx"); 

Answer 5

要使用响应头中的当前日期命名文件，您可以使用以下代码：

 final String Date_FORMAT = "dd/MM/yyyy"; Date currentDate = new Date(); SimpleDateFormat formatDate = new SimpleDateFormat(Date_FORMAT); String datenew = formatDate.format(currentDate); response.setContentType("application/pdf");//for pdf file response.setHeader("Content-disposition","attachment;filename="+ datenew +"Smoelenboek.pdf"); 

Date_Format可以是您想要的任何日期格式！ 🙂

 enter code here 

Answer 6

根据RFC 5987编码内容处理

此代码可以处理非ASCII字符。 代码的某些部分是从Spring Framework复制的。

 import java.nio.charset.Charset; import org.springframework.http.HttpHeaders; import org.springframework.util.Assert; public class HttpHeadersExtended extends HttpHeaders { public static final String CONTENT_DISPOSITION_INLINE = "inline"; public static final String CONTENT_DISPOSITION_ATTACHMENT = "attachment"; /** * Set the (new) value of the {@code Content-Disposition} header * for {@code main body}, optionally encoding the filename using the RFC 5987. * 
Only the US-ASCII, UTF-8 and ISO-8859-1 charsets are supported. * * @param type content disposition type * @param filename the filename (may be {@code null}) * @param charset the charset used for the filename (may be {@code null}) * @see RFC 7230 Section 3.2.4 * @since 4.3.3 */ public void setContentDisposition(String type, String filename, Charset charset) { if (!CONTENT_DISPOSITION_INLINE.equals(type) && !CONTENT_DISPOSITION_ATTACHMENT.equals(type)) { throw new IllegalArgumentException("type must be inline or attachment"); } StringBuilder builder = new StringBuilder(type); if (filename != null) { builder.append("; "); if (charset == null || charset.name().equals("US-ASCII")) { builder.append("filename=\""); builder.append(filename).append('\"'); } else { builder.append("filename*="); builder.append(encodeHeaderFieldParam(filename, charset)); } } set(CONTENT_DISPOSITION, builder.toString()); } /** * Copied from Spring {@link org.springframework.http.HttpHeaders} * * Encode the given header field param as describe in RFC 5987. * * @param input the header field param * @param charset the charset of the header field param string * @return the encoded header field param * @see RFC 5987 */ private static String encodeHeaderFieldParam(String input, Charset charset) { Assert.notNull(input, "Input String should not be null"); Assert.notNull(charset, "Charset should not be null"); if (charset.name().equals("US-ASCII")) { return input; } Assert.isTrue(charset.name().equals("UTF-8") || charset.name().equals("ISO-8859-1"), "Charset should be UTF-8 or ISO-8859-1"); byte[] source = input.getBytes(charset); int len = source.length; StringBuilder sb = new StringBuilder(len << 1); sb.append(charset.name()); sb.append("''"); for (byte b : source) { if (isRFC5987AttrChar(b)) { sb.append((char) b); } else { sb.append('%'); char hex1 = Character.toUpperCase(Character.forDigit((b >> 4) & 0xF, 16)); char hex2 = Character.toUpperCase(Character.forDigit(b & 0xF, 16)); sb.append(hex1); sb.append(hex2); } } return sb.toString(); } /** * Copied from Spring {@link org.springframework.http.HttpHeaders} */ private static boolean isRFC5987AttrChar(byte c) { return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '!' || c == '#' || c == '$' || c == '&' || c == '+' || c == '-' || c == '.' || c == '^' || c == '_' || c == '`' || c == '|' || c == '~'; } }