How to parse Multiparts response body from client side in Spring Boot?

Default HttpMessageReader for parsing "multipart/form-data" requests to a stream of Parts. In default, non-streaming mode, this message reader stores the contents of parts smaller than maxInMemorySize in memory, and parts larger than that to a temporary file in fileStorageDirectory. This reader can be provided to MultipartHttpMessageReader in order to aggregate all parts into a Map. use toEntityFlux and DefaultPartHttpMessageReader for Reactive stack Variant of toEntityFlux(Class) with a Bo

Post, Code and Quiet Time. How to parse Multiparts response body from client side in Spring Boot? By Errong Leng – 25 Feb 2023 – View online → Photo by Edgar Chaparro / Unsplash Default HttpMessageReader for parsing "multipart/form-data" requests to a stream of Parts. In default, non-streaming mode, this message reader stores the contents of parts smaller than maxInMemorySize in memory, and parts larger than that to a temporary file in fileStorageDirectory. This reader can be provided to MultipartHttpMessageReader in order to aggregate all parts into a Map. use toEntityFlux and DefaultPartHttpMessageReader for Reactive stack Variant of toEntityFlux(Class) with a BodyExtractor. Params: bodyExtractor – the BodyExtractor that reads from the response Type parameters: – the body element type Returns: the ResponseEntity Since: 5.3.2 webclient.get() .uri(...uri) .headers(...headers) .retrieve() .toEntityFlux((inputMessage, context) -> partReader.read(ResolvableType.forType(byte[].class), inputMessage, Map.of())) .map(ResponseEntity::getBody) .flatMap(parts -> parts.reduce(MixedResponse.builder(), (body, part) -> { if (part.headers().getContentType().equals(MediaType.APPLICATION_JSON)) { val json = DataBufferUtils.join(part.content()) .map(buffer -> { byte[] bytes = new byte[buffer.readableByteCount()]; buffer.read(bytes); DataBufferUtils.release(buffer); return jsonValueSerializer.deserializeValue(new String(bytes), JSON.class); }); body.json(json); } if (part.headers().getContentType().equals(MediaType.APPLICATION_PDF)) { var pdf = DataBufferUtils.join(part.content()) .map(buffer -> buffer.asByteBuffer().array()); body.pdf(pdf); } return body; }) .map(body -> body.build())); NOTE that the body contents must be completely consumed, relayed, or released to avoid memory leaks. custom HttpMessageConverter for the RestTemplate You might have to custom your own HttpMessageConverter and add into the RestTemplate message converters. RestTemplate restTemplate = new RestTemplate(); restTemplate.getMessageConverters().add(new MultiPartMessageConverter(objectMapper)); final ResponseEntity<ResultModel> responseEntity = restTemplate.getForEntity("http://localhost:" + randomServerPort + "/test", ResultModel.class); final ResultModel resultModel = responseEntity.getBody(); Assertions.assertNotNull(resultModel); Assertions.assertEquals(2, resultModel.secondModel.size()); Assertions.assertEquals("Param1.Value", resultModel.firstModel.param1); Assertions.assertEquals("Param2.Value", resultModel.firstModel.param2); References HttpMessageConverter (Spring Framework 6.0.5 API) declaration: package: org.springframework.http.converter, interface: HttpMessageConverter https://stackoverflow.com/questions/65762857/resttemplate-multipart-form-data-response Post, Code and Quiet Time. © 2023 – Unsubscribe

How to Prepare a multipart body of a response in Sprint Boot

use PartEvent for Reactive Stack To stream multipart data sequentially, you can provide multipart content through PartEvent objects. Form fields can be created via FormPartEvent::create. File uploads can be created via FilePartEvent::create. You can concatenate the streams returned from methods via Flux::concat, and create a request for the WebClient. For instance, this sample will POST a multipart form containing a form field and a file. return Flux.concat( FormPartEvent.creat

Post, Code and Quiet Time. How to Prepare a multipart body of a response in Sprint Boot By Errong Leng – 25 Feb 2023 – View online → use PartEvent for Reactive Stack To stream multipart data sequentially, you can provide multipart content through PartEvent objects. Form fields can be created via FormPartEvent::create. File uploads can be created via FilePartEvent::create. You can concatenate the streams returned from methods via Flux::concat, and create a request for the WebClient. For instance, this sample will POST a multipart form containing a form field and a file. return Flux.concat( FormPartEvent.create("field", "field value"), FilePartEvent.create("file", resource) ); PS: FormPartEvent are only available since Spring-Web version 6.0. use MultiValueMap<String, HttpEntity> for Serverlet Stack MultiValueMap<String, HttpEntity<?>> mixParts = new LinkedMultiValueMap<>(); HttpHeaders jsonHeaders = new HttpHeaders(); jsonHeaders.setContentType(MediaType.APPLICATION_JSON); try { mixParts.add("metadata", new HttpEntity<>(objectMapper.writeValueAsString(response), jsonHeaders)); } catch (JsonProcessingException e) { log.error("Oops!", e); } HttpHeaders pdfHeaders = new HttpHeaders(); pdfHeaders.setContentType(MediaType.APPLICATION_PDF); mixParts.add("pdf", new HttpEntity<>(new ClassPathResource("contract_unsigned.pdf"), pdfHeaders)); return new ResponseEntity<>(mixParts, HttpStatus.OK); References PartEvent (Spring Framework 6.0.5 API) declaration: package: org.springframework.http.codec.multipart, interface: PartEvent Post, Code and Quiet Time. © 2023 – Unsubscribe

How to Prepare the body of a multipart request in Sprint Boot

Prepare the body of a multipart request, resulting in a MultiValueMap<String, HttpEntity>. Parts may be concrete values or via asynchronous types such as Reactor Mono, Flux, and others registered in the ReactiveAdapterRegistry. This builder is intended for use with the reactive WebClient. For multipart requests with the RestTemplate, simply create and populate a MultiValueMap<String, HttpEntity> as shown in the Javadoc for FormHttpMessageConverter and in the reference docs. use MultipartBodyB

Post, Code and Quiet Time. How to Prepare the body of a multipart request in Sprint Boot By Errong Leng – 25 Feb 2023 – View online → Photo by Koen Speelman / Unsplash Prepare the body of a multipart request, resulting in a MultiValueMap<String, HttpEntity>. Parts may be concrete values or via asynchronous types such as Reactor Mono, Flux, and others registered in the ReactiveAdapterRegistry. This builder is intended for use with the reactive WebClient. For multipart requests with the RestTemplate, simply create and populate a MultiValueMap<String, HttpEntity> as shown in the Javadoc for FormHttpMessageConverter and in the reference docs. use MultipartBodyBuilder for WebClient assume you need to post a pdf file and submit some extra information in json together in a single request, you can create the multi part body like below: webclient.post() .uri(...) .headers(...) .accept(MediaType.APPLICATION_JSON) .bodyValue(createMultiPartBody()) .retrieve().bodyToMono(SendSignedAgreementResponse.class); } private MultiValueMap<String, HttpEntity<?>> createMultiPartRelatedBody() { MultipartBodyBuilder builder = new MultipartBodyBuilder(); builder.part("json", json, MediaType.APPLICATION_JSON); builder.part("pdf", new MultipartFile().getResource(), MediaType.APPLICATION_PDF); return builder.build(); } PS: remember set right content type header, or you might got 415 unsupported media type response error. .header(HttpHeaders.CONTENT_TYPE, MediaType.MULTIPART_MIXED_VALUE) .header(HttpHeaders.CONTENT_TYPE, MediaType.MULTIPART_FORM_VALUE) .header(HttpHeaders.CONTENT_TYPE, MediaType.MULTIPART_RELATED_VALUE) the above code is equal to below POST raw log use MultiValueMap<String, HttpEntity> for the RestTemplate MultiValueMap<String, HttpEntity<?>> mixParts = new LinkedMultiValueMap<>(); HttpHeaders jsonHeaders = new HttpHeaders(); jsonHeaders.setContentType(MediaType.APPLICATION_JSON); try { mixParts.add("metadata", new HttpEntity<>(objectMapper.writeValueAsString(response), jsonHeaders)); } catch (JsonProcessingException e) { log.error("Oops!", e); } HttpHeaders pdfHeaders = new HttpHeaders(); pdfHeaders.setContentType(MediaType.APPLICATION_PDF); mixParts.add("pdf", new HttpEntity<>(new ClassPathResource("contract_unsigned.pdf"), pdfHeaders)); Response res = restTemplate.exchange(...url, HttpMethod.POST, mixParts, Response.class); References MultipartBodyBuilder (Spring Framework 6.0.5 API) declaration: package: org.springframework.http.client, class: MultipartBodyBuilder Web on Reactive Stack Web on Servlet Stack Post, Code and Quiet Time. © 2023 – Unsubscribe

How to Create Custom Environment Variable for Your Android App via generated BuildConfig.java from build.gradle

I am building an android app which has an open ad unit. It is suggested to use test ad unit id during developing stage. Hence I hard coded the test ad unit id in my code to debug the open app ad. When the app is ready to release, I have to replace the ad unit id to the real one registered on AdMob. Um. Is there a way to generate the ad unit id during build time? For debug build, it will be assigned with the test ad unit id, the real ad unit id will be replaced release build. By doing so, the cod

Post, Code and Quiet Time. How to Create Custom Environment Variable for Your Android App via generated BuildConfig.java from build.gradle By Errong Leng – 22 Feb 2023 – View online → Photo by Rohan / Unsplash I am building an android app which has an open ad unit. It is suggested to use test ad unit id during developing stage. Hence I hard coded the test ad unit id in my code to debug the open app ad. When the app is ready to release, I have to replace the ad unit id to the real one registered on AdMob. Um. Is there a way to generate the ad unit id during build time? For debug build, it will be assigned with the test ad unit id, the real ad unit id will be replaced release build. By doing so, the code will keep the same to debug and release build. use build.gradle (module:app) The answer is yes, you can Share custom fields and resource values with your app's code At build time, Gradle generates the BuildConfig class so your app code can inspect information about the current build. You can also add custom fields to the BuildConfig class from your Gradle build configuration file using the buildConfigField() method and access those values in your app's runtime code. Likewise, you can add app resource values with resValue(). Add APP_OPEN_AD_UNIT_ID build config example edit your app/build.gradle, add your custom build config field for different build types. e.g.: buildTypes { debug { buildConfigField "String", "APP_OPEN_AD_UNIT_ID", "\"ca-app-pub-3940256099942544/3419835294\"" } release { buildConfigField "String", "APP_OPEN_AD_UNIT_ID", "\"ca-app-pub-real/ad-unit-id\"" } } After you run gradle build, you will see the field APP_OPEN_AD_UNIT_ID defined in BuildConfig.java (generated during build time). Access BuildConfig.APP_OPEN_AD_UNIT_ID import com.lengerrong.coca.BuildConfig; AppOpenAd.load( context, BuildConfig.APP_OPEN_AD_UNIT_ID, request, AppOpenAd.APP_OPEN_AD_ORIENTATION_PORTRAIT, References Gradle tips and recipes | Android Developers Gradle and the Android plugin for Gradle provide a flexible way to compile, build, and package your Android app or library. Android Developers Post, Code and Quiet Time. © 2023 – Unsubscribe