在我的项目中我正在上传一个文件。在上传时，我将其原始文件名和扩展名保存在数据库中，并将该文件与一些GUID保存在服务器上，生成的GUID也与文件名和扩展名一起存储在数据库中。
例如-
-上传文件名为questions.docx
-那么originalfilename将是"questions"
-FileExtension将为".docx"
-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，它会下载文件名作为GUID，在上述情况下为"0c1b96d3-af54-40d1-814d-b863b7528b1c"。
如何下载原始文件名为"questions.docx"的文件?
代码添加
/**
* 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();
}
}
这个代码是完美的吗?
您应该在响应头中设置原始文件名，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:)
您只需从数据库中获取originalName并将其设置在Content-Disposition标头中:
@RequestMapping("/../download")
public ... download(..., HttpServletResponse response) {
...
response.setHeader("Content-Disposition", "attachment; filename="" + original + """);
}
您可以在标题中设置文件名。
比如说，你正在使用RestFul Webservice，那么ResponseBuilder可以这样使用:
ResponseBuilder rsp = Response.ok("Your Content Here", "application/docx");
rsp.setHeader("Content-Disposition", "attachment; filename="" + fileName + """);
内容类型和文件名都可以在运行时设置
嗨@Amogh使用下面的代码
response.setHeader("Content-Disposition", "attachment; filename="+FILENAME+".docx");
根据RFC 5987编码内容-处置
这个代码可以处理非ASCII字符。部分代码是从Spring Framework中复制过来的。
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.
* <p>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 <a href="https://www.rfc-editor.org/rfc/rfc7230#section-3.2.4">RFC 7230 Section 3.2.4</a>
* @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 <a href="https://www.rfc-editor.org/rfc/rfc5987">RFC 5987</a>
*/
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 == '~';
}
}
使用头中的这一行，您可以设置文件的名称:
response.setHeader("Content-disposition", "attachment; filename="+ fileName);
你也可以使用ContentDisposition构建器来添加到HttpHeaders实例中。
示例代码InputStreamResource resource = new InputStreamResource(new FileInputStream(file));
HttpHeaders httpHeaders = new HttpHeaders();
httpHeaders.setContentDisposition(
ContentDisposition.builder("attachment")
.filename(file.getName()).build());
return ResponseEntity.ok()
.contentLength(file.length())
.contentType(MediaType.APPLICATION_OCTET_STREAM)
.headers(httpHeaders)
.body(resource);
有时需要处理编码问题:
response.addHeader("Content-Disposition", "attachment;filename=" + new String(fileName.getBytes(StandardCharsets.UTF_8), StandardCharsets.ISO_8859_1));
要命名一个在响应头中带有当前日期的文件，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可以是任何你想要的日期格式!!:)