英文:
Java JSON String problem encoding Multipart
问题
我正在开发一个接收 MultipartFormDataInput 对象 (org.jboss.resteasy.plugins.providers.multipart.MultipartFormDataInput) 的 REST API，这个对象是来自一个 form-data 的 Vue.js 应用。在数据字段中包含一个包含拉丁重音字符（á, é, í, ó, ú, ñ）的 JSON 字符串。在 Java 中打印 JSON 数据时，我得到了以下结果：
原始的 JSON 字符串：
{"code": "123456789","form": "test","pot": "special character ñ","categoria": "acción","propiedad": "algún","diligencia": "ábaco","actual": "grabé","pais": "Abstraído","vivio_otro_pais_cual": "word without special characters... OK 1 2 3<>?!@#$%^&*()_+"}
在 Java 中接收到的 JSON 字符串：
11:04:32,086 INFO [stdout] (default task-1) JSON VALUES.... {11:04:32,087 INFO [stdout] (default task-1) "code": "123456789",11:04:32,087 INFO [stdout] (default task-1) "form": "test",11:04:32,087 INFO [stdout] (default task-1) "pot": "special character ??",11:04:32,087 INFO [stdout] (default task-1) "categoria": "acci??n",11:04:32,087 INFO [stdout] (default task-1) "propiedad": "alg??n",11:04:32,087 INFO [stdout] (default task-1) "diligencia": "??baco",11:04:32,087 INFO [stdout] (default task-1) "actual": "grab??",11:04:32,087 INFO [stdout] (default task-1) "pais": "Abstra??do",11:04:32,087 INFO [stdout] (default task-1) "vivio_otro_pais_cual": "word without special characters... OK 1 2 3<>?!@#$%^&*()_+"11:04:32,087 INFO [stdout] (default task-1) }
要如何接收带有拉丁特殊字符的字符串？
我的代码（端点）：
@POST@Path("/testEncoding")@Consumes(MediaType.MULTIPART_FORM_DATA)public Response testEncoding(@Context HttpHeaders headers, MultipartFormDataInput multipart){return interfaceOperationService.testEncoding(headers, multipart);}
实现：
public Response testEncoding(HttpHeaders headers, MultipartFormDataInput multipart) {try {String dataJson = multipart.getFormDataPart("data", String.class, null);String valorCodificado = new String (dataJson.getBytes(StandardCharsets.US_ASCII), StandardCharsets.UTF_8);System.out.println("JSON VALUES.... " + dataJson);System.out.println("JSON ENCODING.... " + valorCodificado);StringBuilder sb = new StringBuilder();for (String header : headers.getRequestHeaders().keySet()) {sb.append(header + ":" + headers.getRequestHeader(header) + "\n");}System.out.println(sb.toString());return Response.status(200).entity(valorCodificado).build();} catch (Exception e) {// TODO: handle exceptionreturn Response.status(500).entity("ERROR").build();}}
以及 pom 依赖：
<dependency><groupId>org.jboss.resteasy</groupId><artifactId>resteasy-multipart-provider</artifactId><version>4.5.8.Final</version><scope>provided</scope></dependency>
英文:
I’m developing a REST API that receives a MultipartFormDataInput object (org.jboss.resteasy.plugins.providers.multipart.MultipartFormDataInput), this comes from a form-data Vue.js app. On the data field comes a json string that contains latin accent characters (á, é, í, ó, ú, ñ). When print the json data in Java I get this:
Original Json string
{"code": "123456789","form": "test","pot": "special character ñ","categoria": "acción","propiedad": "algún","diligencia": "ábaco","actual": "grabé","pais": "Abstraído","vivio_otro_pais_cual": "word without special characters... OK 1 2 3<>?!@#$%^&*()_+"}
Json string received in Java
11:04:32,086 INFO [stdout] (default task-1) JSON VALUES.... {11:04:32,087 INFO [stdout] (default task-1) "code": "123456789",11:04:32,087 INFO [stdout] (default task-1) "form": "test",11:04:32,087 INFO [stdout] (default task-1) "pot": "special character ??",11:04:32,087 INFO [stdout] (default task-1) "categoria": "acci??n",11:04:32,087 INFO [stdout] (default task-1) "propiedad": "alg??n",11:04:32,087 INFO [stdout] (default task-1) "diligencia": "??baco",11:04:32,087 INFO [stdout] (default task-1) "actual": "grab??",11:04:32,087 INFO [stdout] (default task-1) "pais": "Abstra??do",11:04:32,087 INFO [stdout] (default task-1) "vivio_otro_pais_cual": "word without special characters... OK 1 2 3<>?!@#$%^&*()_+"11:04:32,087 INFO [stdout] (default task-1) }11:04:32,088 INFO [stdout] (default task-1) JSON ENCODING.... {11:04:32,088 INFO [stdout] (default task-1) "code": "123456789",11:04:32,088 INFO [stdout] (default task-1) "form": "test",11:04:32,088 INFO [stdout] (default task-1) "pot": "special character ??",11:04:32,088 INFO [stdout] (default task-1) "categoria": "acci??n",11:04:32,088 INFO [stdout] (default task-1) "propiedad": "alg??n",11:04:32,088 INFO [stdout] (default task-1) "diligencia": "??baco",11:04:32,088 INFO [stdout] (default task-1) "actual": "grab??",11:04:32,088 INFO [stdout] (default task-1) "pais": "Abstra??do",11:04:32,088 INFO [stdout] (default task-1) "vivio_otro_pais_cual": "word without special characters... OK 1 2 3<>?!@#$%^&*()_+"11:04:32,088 INFO [stdout] (default task-1) }
What can i do to receive the string with latin special characters?
My code (end point):
@POST@Path("/testEncoding")@Consumes(MediaType.MULTIPART_FORM_DATA)public Response testEncoding(@Context HttpHeaders headers, MultipartFormDataInput multipart){return interfaceOperationService.testEncoding(headers, multipart);}
Implementation:
public Response testEncoding(HttpHeaders headers, MultipartFormDataInput multipart) {try {String dataJson = multipart.getFormDataPart("data", String.class, null);String valorCodificado = new String (dataJson.getBytes(StandardCharsets.US_ASCII), StandardCharsets.UTF_8);System.out.println("JSON VALUES.... " + dataJson);System.out.println("JSON ENCODING.... " + valorCodificado);StringBuilder sb = new StringBuilder();for (String header : headers.getRequestHeaders().keySet()) {sb.append(header + ":" + headers.getRequestHeader(header) + "\n");}System.out.println(sb.toString());return Response.status(200).entity(valorCodificado).build();} catch (Exception e) {// TODO: handle exceptionreturn Response.status(500).entity("ERROR").build();}}
and pom dependency:
<dependency><groupId>org.jboss.resteasy</groupId><artifactId>resteasy-multipart-provider</artifactId><version>4.5.8.Final</version><scope>provided</scope></dependency>
答案1
得分: 1
所以在多部分内容中，每个消息体部分都是一个独立的实体，具有自己独立的内容类型。如果您在客户端请求中没有为每个部分设置内容类型，则会假定为 text/plain。在 RESTEasy 实现的情况下，默认为 text/plain; charset=ISO-8859-1。
>InputPart.DEFAULT_CONTENT_TYPE_PROPERTY<br>
>如果在多部分消息的某个部分中未发送内容类型头，则会假定为 "text/plain; charset=ISO-8859-1"。
许多客户端无法为每个部分设置内容类型头。因此，您应该为它们设置内容类型头。对于这个部分，您希望它是 application/json; chartset=utf-8。设置头的方法是从 MultiPartFormDataInput 获取 InputPart。不要使用 getFormDataPart() 方法，而要使用 getFormDataMap() 方法，以获得返回类型为 Map<String, List<InputPart>>。从那里获取 InputPart 并调用 InputPart#setMediaTye()，然后可以使用 InputPart#getBody() 变体之一获取数据。类似于（未经测试）：
Map<String, List<InputPart>> inputParts = multipart.getFormDataMap();List<InputPart> dataParts = inputParts.get("data");if (dataParts != null && !dataParts.isEmpty()) {InputPart dataPart = dataParts.get(0);dataPart.setMediaType(MediaType.APPLICATION_JSON + "; chartset=utf-8");String dataPartJson = dataPart.getBody(String.class, null);// 或者如果您创建了一个 POJO，则数据将由 Jackson 进行反序列化DataPojo dataPartPogo = dataPart.getBody(DataPojo.class, null);}
英文:
So in multipart, each body part is its own separate entity with its own separate content-type. If you don't set the content-type for each part in the client request, it is assumed to be text/plain. In the case of RESTEasy implementation, it is text/plain; charset=ISO-8859-1.
>InputPart.DEFAULT_CONTENT_TYPE_PROPERTY<br>
>If no content-type header is sent in a multipart message part "text/plain; charset=ISO-8859-1" is assumed.
A lot of clients are not able to set the content-type header for each part. So what you should do is set the content-type header for them. For this part, you want it to be application/json; chartset=utf-8. How you set the header is by getting the InputPart from the MultiPartFormDataInput. Instead of using the getFormDataPart() method, use the getFormDataMap() method to get a Map<String, List<InputPart>> return type. From there, get the InputPart and call InputPart#setMediaTye(), then you can get the data with one of the InputPart#getBody() variants. Something like (not tested):
Map<String, List<InputPart>> inputParts = multipart.getFormDataMap();List<InputPart> dataParts = inputParts.get("data");if (dataParts != null && !dataParts.isEmpty()) {InputPart dataPart = dataParts.get(0);dataPart.setMediaType(MediaType.APPLICATION_JSON + "; chartset=utf-8");String dataPartJson = dataPart.getBody(String.class, null);// of if you make a POJO the data will get deserialized by JacksonDataPojo dataPartPogo = dataPart.getBody(DataPojo.class, null);}
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