Java GenericHttpMessageConverter类代码示例

import org.springframework.http.converter.GenericHttpMessageConverter; //导入依赖的package包/类
@Override
public T extractData(ResponseEntity<HttpInputMessage> responseEntity) throws IOException {
    MediaType contentType = getContentType(responseEntity);
    for (HttpMessageConverter<?> messageConverter : this.messageConverters) {
        if (messageConverter instanceof GenericHttpMessageConverter) {
            GenericHttpMessageConverter<?> genericMessageConverter =
                    (GenericHttpMessageConverter<?>) messageConverter;
            if (genericMessageConverter.canRead(this.responseType, null, contentType)) {
                return (T) genericMessageConverter.read(this.responseType, null, responseEntity.getBody());
            }
        }
        if (this.responseClass != null) {
            if (messageConverter.canRead(this.responseClass, contentType)) {
                return (T) messageConverter.read((Class) this.responseClass, responseEntity.getBody());
            }
        }
    }

    throw new WxApiResponseException("不能转换相应数据为类型：" + this.responseType, responseEntity);
}
 

import org.springframework.http.converter.GenericHttpMessageConverter; //导入依赖的package包/类
/**
 * Returns the media types that can be produced:
 * <ul>
 * <li>The producible media types specified in the request mappings, or
 * <li>Media types of configured converters that can write the specific return value, or
 * <li>{@link MediaType#ALL}
 * </ul>
 * @since 4.2
 */
@SuppressWarnings("unchecked")
protected List<MediaType> getProducibleMediaTypes(HttpServletRequest request, Class<?> returnValueClass, Type returnValueType) {
	Set<MediaType> mediaTypes = (Set<MediaType>) request.getAttribute(HandlerMapping.PRODUCIBLE_MEDIA_TYPES_ATTRIBUTE);
	if (!CollectionUtils.isEmpty(mediaTypes)) {
		return new ArrayList<MediaType>(mediaTypes);
	}
	else if (!this.allSupportedMediaTypes.isEmpty()) {
		List<MediaType> result = new ArrayList<MediaType>();
		for (HttpMessageConverter<?> converter : this.messageConverters) {
			if (converter instanceof GenericHttpMessageConverter && returnValueType != null) {
				if (((GenericHttpMessageConverter<?>) converter).canWrite(returnValueType, returnValueClass, null)) {
					result.addAll(converter.getSupportedMediaTypes());
				}
			}
			else if (converter.canWrite(returnValueClass, null)) {
				result.addAll(converter.getSupportedMediaTypes());
			}
		}
		return result;
	}
	else {
		return Collections.singletonList(MediaType.ALL);
	}
}
 

import org.springframework.http.converter.GenericHttpMessageConverter; //导入依赖的package包/类
@Test
@SuppressWarnings("unchecked")
public void generics() throws IOException {
	GenericHttpMessageConverter<String> converter = mock(GenericHttpMessageConverter.class);
	List<HttpMessageConverter<?>> converters = createConverterList(converter);
	HttpHeaders responseHeaders = new HttpHeaders();
	MediaType contentType = MediaType.TEXT_PLAIN;
	responseHeaders.setContentType(contentType);
	String expected = "Foo";
	ParameterizedTypeReference<List<String>> reference = new ParameterizedTypeReference<List<String>>() {};
	Type type = reference.getType();
	extractor = new HttpMessageConverterExtractor<List<String>>(type, converters);
	given(response.getStatusCode()).willReturn(HttpStatus.OK);
	given(response.getHeaders()).willReturn(responseHeaders);
	given(response.getBody()).willReturn(new ByteArrayInputStream(expected.getBytes()));
	given(converter.canRead(type, null, contentType)).willReturn(true);
	given(converter.read(eq(type), eq(null), any(HttpInputMessage.class))).willReturn(expected);

	Object result = extractor.extractData(response);

	assertEquals(expected, result);
}
 

import org.springframework.http.converter.GenericHttpMessageConverter; //导入依赖的package包/类
@Test
@SuppressWarnings("unchecked")
public void generics() throws IOException {
	GenericHttpMessageConverter<String> converter = mock(GenericHttpMessageConverter.class);
	List<HttpMessageConverter<?>> converters = createConverterList(converter);
	HttpHeaders responseHeaders = new HttpHeaders();
	MediaType contentType = MediaType.TEXT_PLAIN;
	responseHeaders.setContentType(contentType);
	String expected = "Foo";
	ParameterizedTypeReference<List<String>> reference = new ParameterizedTypeReference<List<String>>() {};
	Type type = reference.getType();
	extractor = new HttpMessageConverterExtractor<List<String>>(type, converters);
	given(response.getStatusCode()).willReturn(HttpStatus.OK);
	given(response.getHeaders()).willReturn(responseHeaders);
	given(converter.canRead(type, null, contentType)).willReturn(true);
	given(converter.read(type, null, response)).willReturn(expected);

	Object result = extractor.extractData(response);

	assertEquals(expected, result);
}
 

import org.springframework.http.converter.GenericHttpMessageConverter; //导入依赖的package包/类
@Override
public void doWithRequest(ClientHttpRequest request) throws IOException {
	if (responseType != null) {
		Class<?> responseClass = null;
		if (responseType instanceof Class) {
			responseClass = (Class<?>) responseType;
		}

		List<MediaType> allSupportedMediaTypes = new ArrayList<MediaType>();
		for (HttpMessageConverter<?> converter : getMessageConverters()) {
			if (responseClass != null) {
				if (converter.canRead(responseClass, null)) {
					allSupportedMediaTypes.addAll(getSupportedMediaTypes(converter));
				}
			}
			else if (converter instanceof GenericHttpMessageConverter) {

				GenericHttpMessageConverter<?> genericConverter = (GenericHttpMessageConverter<?>) converter;
				if (genericConverter.canRead(responseType, null, null)) {
					allSupportedMediaTypes.addAll(getSupportedMediaTypes(converter));
				}
			}

		}
		if (!allSupportedMediaTypes.isEmpty()) {
			MediaType.sortBySpecificity(allSupportedMediaTypes);
			if (logger.isDebugEnabled()) {
				logger.debug("Setting request Accept header to " +
						allSupportedMediaTypes);
			}
			request.getHeaders().setAccept(allSupportedMediaTypes);
		}
	}
}
 

import org.springframework.http.converter.GenericHttpMessageConverter; //导入依赖的package包/类
@Override
@SuppressWarnings({ "unchecked", "rawtypes" })
public T extractData(ClientHttpResponse response) throws IOException {
	if (!hasMessageBody(response)) {
		return null;
	}
	MediaType contentType = getContentType(response);

	for (HttpMessageConverter<?> messageConverter : this.messageConverters) {
		if (messageConverter instanceof GenericHttpMessageConverter) {
			GenericHttpMessageConverter<?> genericMessageConverter = (GenericHttpMessageConverter<?>) messageConverter;
			if (genericMessageConverter.canRead(this.responseType, null, contentType)) {
				if (logger.isDebugEnabled()) {
					logger.debug("Reading [" + this.responseType + "] as \"" +
							contentType + "\" using [" + messageConverter + "]");
				}
				return (T) genericMessageConverter.read(this.responseType, null, response);
			}
		}
		if (this.responseClass != null) {
			if (messageConverter.canRead(this.responseClass, contentType)) {
				if (logger.isDebugEnabled()) {
					logger.debug("Reading [" + this.responseClass.getName() + "] as \"" +
							contentType + "\" using [" + messageConverter + "]");
				}
				return (T) messageConverter.read((Class) this.responseClass, response);
			}
		}
	}
	throw new RestClientException(
			"Could not extract response: no suitable HttpMessageConverter found for response type [" +
					this.responseType + "] and content type [" + contentType + "]");
}
 

import org.springframework.http.converter.GenericHttpMessageConverter; //导入依赖的package包/类
@Override
public void doWithRequest(ClientHttpRequest request) throws IOException {
	if (this.responseType != null) {
		Class<?> responseClass = null;
		if (this.responseType instanceof Class) {
			responseClass = (Class<?>) this.responseType;
		}
		List<MediaType> allSupportedMediaTypes = new ArrayList<MediaType>();
		for (HttpMessageConverter<?> converter : getMessageConverters()) {
			if (responseClass != null) {
				if (converter.canRead(responseClass, null)) {
					allSupportedMediaTypes.addAll(getSupportedMediaTypes(converter));
				}
			}
			else if (converter instanceof GenericHttpMessageConverter) {
				GenericHttpMessageConverter<?> genericConverter = (GenericHttpMessageConverter<?>) converter;
				if (genericConverter.canRead(this.responseType, null, null)) {
					allSupportedMediaTypes.addAll(getSupportedMediaTypes(converter));
				}
			}
		}
		if (!allSupportedMediaTypes.isEmpty()) {
			MediaType.sortBySpecificity(allSupportedMediaTypes);
			if (logger.isDebugEnabled()) {
				logger.debug("Setting request Accept header to " + allSupportedMediaTypes);
			}
			request.getHeaders().setAccept(allSupportedMediaTypes);
		}
	}
}
 

import org.springframework.http.converter.GenericHttpMessageConverter; //导入依赖的package包/类
@Override
@SuppressWarnings({"unchecked", "rawtypes"})
public T extractData(ClientHttpResponse response) throws IOException {
	MessageBodyClientHttpResponseWrapper responseWrapper = new MessageBodyClientHttpResponseWrapper(response);
	if (!responseWrapper.hasMessageBody() || responseWrapper.hasEmptyMessageBody()) {
		return null;
	}
	MediaType contentType = getContentType(responseWrapper);

	for (HttpMessageConverter<?> messageConverter : this.messageConverters) {
		if (messageConverter instanceof GenericHttpMessageConverter) {
			GenericHttpMessageConverter<?> genericMessageConverter = (GenericHttpMessageConverter<?>) messageConverter;
			if (genericMessageConverter.canRead(this.responseType, null, contentType)) {
				if (logger.isDebugEnabled()) {
					logger.debug("Reading [" + this.responseType + "] as \"" +
							contentType + "\" using [" + messageConverter + "]");
				}
				return (T) genericMessageConverter.read(this.responseType, null, responseWrapper);
			}
		}
		if (this.responseClass != null) {
			if (messageConverter.canRead(this.responseClass, contentType)) {
				if (logger.isDebugEnabled()) {
					logger.debug("Reading [" + this.responseClass.getName() + "] as \"" +
							contentType + "\" using [" + messageConverter + "]");
				}
				return (T) messageConverter.read((Class) this.responseClass, responseWrapper);
			}
		}
	}

	throw new RestClientException("Could not extract response: no suitable HttpMessageConverter found " +
			"for response type [" + this.responseType + "] and content type [" + contentType + "]");
}
 

import org.springframework.http.converter.GenericHttpMessageConverter; //导入依赖的package包/类
@SuppressWarnings("unchecked")
@Override
public Converter<ResponseBody, ?> responseBodyConverter(Type type, Annotation[] annotations, Retrofit retrofit) {
	if (type instanceof Class || type instanceof ParameterizedType) {
		//MediaType contentType = getContentType(responseWrapper);
		MediaType contentType = MediaType.APPLICATION_JSON; //TODO: determine dynamically?
		Class<?> responseClass = (type instanceof Class) ? (Class<?>) type : null;


		for (HttpMessageConverter<?> messageConverter : this.messageConverters.getObject().getConverters()) {
			if (messageConverter instanceof GenericHttpMessageConverter) {
				GenericHttpMessageConverter<?> genericMessageConverter = (GenericHttpMessageConverter<?>) messageConverter;
				if (genericMessageConverter.canRead(type, null, contentType)) {
					if (log.isDebugEnabled()) {
						log.debug("Reading [" + type + "] as \"" +
								contentType + "\" using [" + messageConverter + "]");
					}
					return new SpringResponseConverter(genericMessageConverter, type);
				}
			}
			if (responseClass != null) {
				if (messageConverter.canRead(responseClass, contentType)) {
					if (log.isDebugEnabled()) {
						log.debug("Reading [" + responseClass.getName() + "] as \"" +
								contentType + "\" using [" + messageConverter + "]");
					}
					return new SpringResponseConverter(messageConverter, responseClass);
				}
			}
		}
	}
	return null;
}
 

import org.springframework.http.converter.GenericHttpMessageConverter; //导入依赖的package包/类
@SuppressWarnings("unchecked")
public void doWithRequest(ClientHttpRequest request) throws IOException {
	if (responseType != null) {
		Class<?> responseClass = null;
		if (responseType instanceof Class) {
			responseClass = (Class<?>) responseType;
		}

		List<MediaType> allSupportedMediaTypes = new ArrayList<MediaType>();
		for (HttpMessageConverter<?> converter : getMessageConverters()) {
			if (responseClass != null) {
				if (converter.canRead(responseClass, null)) {
					allSupportedMediaTypes.addAll(getSupportedMediaTypes(converter));
				}
			}
			else if (converter instanceof GenericHttpMessageConverter) {

				GenericHttpMessageConverter<?> genericConverter = (GenericHttpMessageConverter<?>) converter;
				if (genericConverter.canRead(responseType, null, null)) {
					allSupportedMediaTypes.addAll(getSupportedMediaTypes(converter));
				}
			}

		}
		if (!allSupportedMediaTypes.isEmpty()) {
			MediaType.sortBySpecificity(allSupportedMediaTypes);
			if (logger.isDebugEnabled()) {
				logger.debug("Setting request Accept header to " +
						allSupportedMediaTypes);
			}
			request.getHeaders().setAccept(allSupportedMediaTypes);
		}
	}
}
 

import org.springframework.http.converter.GenericHttpMessageConverter; //导入依赖的package包/类
@SuppressWarnings("unchecked")
public T extractData(ClientHttpResponse response) throws IOException {
	if (!hasMessageBody(response)) {
		return null;
	}
	MediaType contentType = getContentType(response);

	for (HttpMessageConverter messageConverter : this.messageConverters) {
		if (messageConverter instanceof GenericHttpMessageConverter) {
			GenericHttpMessageConverter genericMessageConverter = (GenericHttpMessageConverter) messageConverter;
			if (genericMessageConverter.canRead(this.responseType, null, contentType)) {
				if (logger.isDebugEnabled()) {
					logger.debug("Reading [" + this.responseType + "] as \"" +
							contentType + "\" using [" + messageConverter + "]");
				}
				return (T) genericMessageConverter.read(this.responseType, null, response);
			}
		}
		if (this.responseClass != null) {
			if (messageConverter.canRead(this.responseClass, contentType)) {
				if (logger.isDebugEnabled()) {
					logger.debug("Reading [" + this.responseClass.getName() + "] as \"" +
							contentType + "\" using [" + messageConverter + "]");
				}
				return (T) messageConverter.read(this.responseClass, response);
			}
		}
	}
	throw new RestClientException(
			"Could not extract response: no suitable HttpMessageConverter found for response type [" +
					this.responseType + "] and content type [" + contentType + "]");
}
 

import org.springframework.http.converter.GenericHttpMessageConverter; //导入依赖的package包/类
@Test
@SuppressWarnings("rawtypes")
public void exchangeParameterizedType() throws Exception {
	GenericHttpMessageConverter converter = mock(GenericHttpMessageConverter.class);
	template.setMessageConverters(Collections.<HttpMessageConverter<?>>singletonList(converter));

	ParameterizedTypeReference<List<Integer>> intList = new ParameterizedTypeReference<List<Integer>>() {};
	given(converter.canRead(intList.getType(), null, null)).willReturn(true);
	given(converter.getSupportedMediaTypes()).willReturn(Collections.singletonList(MediaType.TEXT_PLAIN));
	given(requestFactory.createRequest(new URI("http://example.com"), HttpMethod.POST)).willReturn(this.request);
	HttpHeaders requestHeaders = new HttpHeaders();
	given(this.request.getHeaders()).willReturn(requestHeaders);
	given(converter.canWrite(String.class, null)).willReturn(true);
	String requestBody = "Hello World";
	converter.write(requestBody, null, this.request);
	given(this.request.execute()).willReturn(response);
	given(errorHandler.hasError(response)).willReturn(false);
	List<Integer> expected = Collections.singletonList(42);
	HttpHeaders responseHeaders = new HttpHeaders();
	responseHeaders.setContentType(MediaType.TEXT_PLAIN);
	responseHeaders.setContentLength(10);
	given(response.getStatusCode()).willReturn(HttpStatus.OK);
	given(response.getHeaders()).willReturn(responseHeaders);
	given(response.getBody()).willReturn(new ByteArrayInputStream(new Integer(42).toString().getBytes()));
	given(converter.canRead(intList.getType(), null, MediaType.TEXT_PLAIN)).willReturn(true);
	given(converter.read(eq(intList.getType()), eq(null), any(HttpInputMessage.class))).willReturn(expected);
	given(response.getStatusCode()).willReturn(HttpStatus.OK);
	HttpStatus status = HttpStatus.OK;
	given(response.getStatusCode()).willReturn(status);
	given(response.getStatusText()).willReturn(status.getReasonPhrase());

	HttpHeaders entityHeaders = new HttpHeaders();
	entityHeaders.set("MyHeader", "MyValue");
	HttpEntity<String> requestEntity = new HttpEntity<String>(requestBody, entityHeaders);
	ResponseEntity<List<Integer>> result = template.exchange("http://example.com", HttpMethod.POST, requestEntity, intList);
	assertEquals("Invalid POST result", expected, result.getBody());
	assertEquals("Invalid Content-Type", MediaType.TEXT_PLAIN, result.getHeaders().getContentType());
	assertEquals("Invalid Accept header", MediaType.TEXT_PLAIN_VALUE, requestHeaders.getFirst("Accept"));
	assertEquals("Invalid custom header", "MyValue", requestHeaders.getFirst("MyHeader"));
	assertEquals("Invalid status code", HttpStatus.OK, result.getStatusCode());

	verify(response).close();
}
 

import org.springframework.http.converter.GenericHttpMessageConverter; //导入依赖的package包/类
public SpringResponseConverter(GenericHttpMessageConverter<?> genericMessageConverter, Type type) {
	this.genericMessageConverter = genericMessageConverter;
	this.type = type;
}
 

import org.springframework.http.converter.GenericHttpMessageConverter; //导入依赖的package包/类
/**
 * Creates the method argument value of the expected parameter type by reading
 * from the given HttpInputMessage.
 *
 * @param <T> the expected type of the argument value to be created
 * @param inputMessage the HTTP input message representing the current request
 * @param methodParam the method argument
 * @param targetType the type of object to create, not necessarily the same as
 * the method parameter type (e.g. for {@code HttpEntity<String>} method
 * parameter the target type is String)
 * @return the created method argument value
 * @throws IOException if the reading from the request fails
 * @throws HttpMediaTypeNotSupportedException if no suitable message converter is found
 */
@SuppressWarnings("unchecked")
protected <T> Object readWithMessageConverters(HttpInputMessage inputMessage,
		MethodParameter methodParam, Type targetType) throws IOException, HttpMediaTypeNotSupportedException {

	MediaType contentType;
	try {
		contentType = inputMessage.getHeaders().getContentType();
	}
	catch (InvalidMediaTypeException ex) {
		throw new HttpMediaTypeNotSupportedException(ex.getMessage());
	}

	if (contentType == null) {
		contentType = MediaType.APPLICATION_OCTET_STREAM;
	}

			Class<?> contextClass = methodParam.getDeclaringClass();
			Map<TypeVariable, Type> map = GenericTypeResolver.getTypeVariableMap(contextClass);
			Class<T> targetClass = (Class<T>) GenericTypeResolver.resolveType(targetType, map);

			for (HttpMessageConverter<?> converter : this.messageConverters) {
				if (converter instanceof GenericHttpMessageConverter) {
					GenericHttpMessageConverter genericConverter = (GenericHttpMessageConverter) converter;
					if (genericConverter.canRead(targetType, contextClass, contentType)) {
						if (logger.isDebugEnabled()) {
							logger.debug("Reading [" + targetType + "] as \"" +
									contentType + "\" using [" + converter + "]");
						}
						return genericConverter.read(targetType, contextClass, inputMessage);
					}
				}
				if (targetClass != null) {
					if (converter.canRead(targetClass, contentType)) {
						if (logger.isDebugEnabled()) {
							logger.debug("Reading [" + targetClass.getName() + "] as \"" +
									contentType + "\" using [" + converter + "]");
						}
						return ((HttpMessageConverter<T>) converter).read(targetClass, inputMessage);
					}
				}
			}

			throw new HttpMediaTypeNotSupportedException(contentType, allSupportedMediaTypes);
		}
 

import org.springframework.http.converter.GenericHttpMessageConverter; //导入依赖的package包/类
@Test
public void exchangeParameterizedType() throws Exception {
	GenericHttpMessageConverter converter = mock(GenericHttpMessageConverter.class);
	template.setMessageConverters(Collections.<HttpMessageConverter<?>>singletonList(converter));

	ParameterizedTypeReference<List<Integer>> intList = new ParameterizedTypeReference<List<Integer>>() {};
	given(converter.canRead(intList.getType(), null, null)).willReturn(true);
	given(converter.getSupportedMediaTypes()).willReturn(Collections.singletonList(MediaType.TEXT_PLAIN));
	given(requestFactory.createRequest(new URI("http://example.com"), HttpMethod.POST)).willReturn(this.request);
	HttpHeaders requestHeaders = new HttpHeaders();
	given(this.request.getHeaders()).willReturn(requestHeaders);
	given(converter.canWrite(String.class, null)).willReturn(true);
	String requestBody = "Hello World";
	converter.write(requestBody, null, this.request);
	given(this.request.execute()).willReturn(response);
	given(errorHandler.hasError(response)).willReturn(false);
	HttpHeaders responseHeaders = new HttpHeaders();
	responseHeaders.setContentType(MediaType.TEXT_PLAIN);
	responseHeaders.setContentLength(10);
	given(response.getStatusCode()).willReturn(HttpStatus.OK);
	given(response.getHeaders()).willReturn(responseHeaders);
	List<Integer> expected = Collections.singletonList(42);
	given(converter.canRead(intList.getType(), null, MediaType.TEXT_PLAIN)).willReturn(true);
	given(converter.read(intList.getType(), null, response)).willReturn(expected);
	given(response.getStatusCode()).willReturn(HttpStatus.OK);
	HttpStatus status = HttpStatus.OK;
	given(response.getStatusCode()).willReturn(status);
	given(response.getStatusText()).willReturn(status.getReasonPhrase());

	HttpHeaders entityHeaders = new HttpHeaders();
	entityHeaders.set("MyHeader", "MyValue");
	HttpEntity<String> requestEntity = new HttpEntity<String>(requestBody, entityHeaders);
	ResponseEntity<List<Integer>> result = template.exchange("http://example.com", HttpMethod.POST, requestEntity, intList);
	assertEquals("Invalid POST result", expected, result.getBody());
	assertEquals("Invalid Content-Type", MediaType.TEXT_PLAIN, result.getHeaders().getContentType());
	assertEquals("Invalid Accept header", MediaType.TEXT_PLAIN_VALUE, requestHeaders.getFirst("Accept"));
	assertEquals("Invalid custom header", "MyValue", requestHeaders.getFirst("MyHeader"));
	assertEquals("Invalid status code", HttpStatus.OK, result.getStatusCode());

	verify(response).close();
}