如何使用RESTeasy从multipart / form-data请求获取text / xml为UTF-8？

Question

thanks for your answer, but using an InputStream instead of using getBody(...) does also not work. 谢谢你的回答，但使用InputStream而不是使用getBody（...）也行不通。 The code below returns the same result as the one from my original post. 下面的代码返回与原始帖子中的结果相同的结果。

final InputStream inStream = fileUploadInput.getFormDataPart(searchedInput, InputStream.class, null);
// get bytes
final byte[] inBytes = new byte[1024];
final ByteArrayOutputStream outBytes = new ByteArrayOutputStream(inBytes.length);
int length = 0;
while((length = inStream.read(inBytes)) >= 0) {
    outBytes.write(inBytes, 0, length);
}
final byte[] rawInput = outBytes.toByteArray();

// get Encoding
final String asciiInput = 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;

ORIGINAL POST: 原始邮寄：

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 shown below. 我想使用下面的HTML表单上传UTF-8编码的XML文件，并使用RESTEasy MultipartFormDataInput和下面显示的Java代码在服务器上读取它。 On the server side I seem to be getting the content of the file(s) ASCII encoded, independent of the actual encoding of the uploaded files (which is UTF-8) (accessing it the way described below). 在服务器端，我似乎得到了ASCII编码文件的内容，与上传文件的实际编码（UTF-8）无关（以下面描述的方式访问它）。 All characters not part of the ASCII character set are are being replaced by ? 所有不属于ASCII字符集的字符都被替换为? . 。 How can I get 'text/xml' as UTF-8 from a 'multipart/form-data' request with RESTeasy? 如何从RESTeasy的'multipart / form-data'请求中将'text / xml'作为UTF-8？ (I know it is possible to write a PreProcessor - Interceptor and get the raw bytes there, but I can't use this approach in my application). （我知道可以编写一个PreProcessor - Interceptor并在那里获取原始字节，但我不能在我的应用程序中使用这种方法）。

Upload Form: 上传表格：

<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>

Resource class: 资源类：

@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);
    }
}

MessageBodyReader: 化MessageBodyReader：

@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;
    }
}

Answer 1

When no charset is defined in the content-type header of your HTTP request, resteasy assumes 'charset=US-ASCII'. 如果在HTTP请求的内容类型标头中未定义字符集，则resteasy会假定为“charset = US-ASCII”。 See org.jboss.resteasy.plugins.providers.multipart.InputPart: 请参阅org.jboss.resteasy.plugins.providers.multipart.InputPart：

/**
    * If there is a content-type header without a charset parameter, charset=US-ASCII
    * is assumed.
    * <p>
    * This can be overwritten by setting a different String value in
    * {@link org.jboss.resteasy.spi.HttpRequest#setAttribute(String, Object)}
    * with this ("resteasy.provider.multipart.inputpart.defaultCharset")
    * String`enter code here` as key. It should be done in a
    * {@link org.jboss.resteasy.spi.interception.PreProcessInterceptor}.
    * </p>
     */

So, as a work-around you can do the following: 因此，作为一种解决方法，您可以执行以下操作：

 @Provider
@ServerInterceptor
public class CharsetPreProcessInterceptor implements PreProcessInterceptor {

    @Override
    public ServerResponse preProcess(HttpRequest request, ResourceMethod method) throws Failure, WebApplicationException {
        request.setAttribute(InputPart.DEFAULT_CHARSET_PROPERTY, "charset=UTF-8");
        return null;
    }

}

Answer 2

I generally would not rely on the getBody method on InputPart . 我一般不会依靠getBody的方法InputPart 。 You can actually get each part as a raw input stream and read the data in yourself. 您实际上可以将每个部分作为原始输入流并自己读取数据。 Rather than relying on the framework to convert the content to a String. 而不是依靠框架将内容转换为String。

如何使用RESTeasy从multipart / form-data请求获取text / xml为UTF-8？

问题描述

ORIGINAL POST: 原始邮寄：

2 个解决方案

解决方案1
4 2013-04-26 11:04:16

解决方案2
0 2012-03-19 10:58:43

如何使用RESTeasy从multipart / form-data请求获取text / xml为UTF-8？

问题描述

ORIGINAL POST: 原始邮寄：

2 个解决方案

解决方案1 4 2013-04-26 11:04:16

解决方案2 0 2012-03-19 10:58:43

解决方案1
4 2013-04-26 11:04:16

解决方案2
0 2012-03-19 10:58:43