How to get text/xml as UTF-8 from a multipart/form-data request with RESTeasy?
Hi,
I want to upload utf-8 encoded xml files using the html form below and read it on the server using a RESTEasy MultipartFormDataInput and the java code below. The content of the uploaded file is already ASCII encoded independend of the encoding of the uploaded file, if I access it the way described below. All characters not part of ASCII are already replaced by ?. How can I get text/xml as UTF-8 from a multipart/form-data request with RESTeasy?
<html>
<body>
<h1>JAX-RS Upload Form</h1>
<form action="http://.../upload" method="POST" enctype="multipart/form-data">
<p>Select a file : <input type="file" name="upload"/></p>
<input type="submit" value="Upload It" />
</form>
</body>
</html>
...
@Path("/upload")
@POST
@Consumes("multipart/form-data")
public Response createUploadTemplate(
@Context HttpServletRequest req,
MultipartFormDataInput formInput) {
try {
final String templateXml = getInput("upload", formInput);
...
} catch (Exception e) {
...
}
}
private static String getInput(final String searchedInput, final MultipartFormDataInput fileUploadInput) throws BadRequestException, IOException {
try {
final Map<String, List<InputPart>> inputToInputPart = fileUploadInput.getFormDataMap();
if(inputToInputPart.containsKey(searchedInput)) {
final StringBuilder builder = new StringBuilder();
final List<InputPart> inputParts = inputToInputPart.get(searchedInput);
for(InputPart inputPart : inputParts) {
builder.append(inputPart.getBody(String.class,null));
}
return builder.toString();
} else {
throw new BadRequestException("The form send with the request does not contain an input element " + searchedInput + ".");
}
} catch(Exception e) {
throw new BadRequestException("The file upload failed.", e);
}
}
...
@Provider
@Consumes ("text/xml")
public class XmlStringReader implements MessageBodyReader<String> {
private static Logger log = LoggerFactory.getLogger(UploadedXmlStringReader.class);
private static final String ASCII = "ASCII";
private static final String ISO8859_1 = "ISO8859_1";
private static final String UTF8 = "UTF8";
@Override
public boolean isReadable(final Class<?> type,
final Type genericType,
final Annotation[] annotations,
final MediaType mediaType) {
boolean result = type.equals(String.class) && MediaType.TEXT_XML_TYPE.equals(mediaType);
log.info(MessageFormat.format("{0} == String.class && MediaType.TEXT_XML_TYPE == {1}: {2}", type, mediaType, result));
return result;
}
@Override
public String readFrom(final Class<String> type,
final Type genericType,
final Annotation[] annotations,
final MediaType mediaType,
final MultivaluedMap<String, String> httpHeaders,
final InputStream entityStream) throws IOException, WebApplicationException {
final byte[] inBytes = new byte[1024];
final ByteArrayOutputStream outBytes = new ByteArrayOutputStream(inBytes.length);
int length = 0;
while((length = entityStream.read(inBytes)) >= 0) {
outBytes.write(inBytes, 0, length);
}
final byte[] rawInput = outBytes.toByteArray();
final String ascii = new String(rawInput, ASCII);
final String utf8 = new String(rawInput, UTF8);
final String isoLatin1 = new String(rawInput, ISO8859_1);
log.info("ASCII: " + ascii);
log.info("UTF8: " + utf8);
log.info("ISOLATIN1: " + isoLatin1);
return utf8;
}
}