Feign远程调用-IPage分页返回对象-序列化错误

当使用Feign调用服务IPage分页接口时，会出现序列化异常。

解决方式如下:

添加配置文件IPageDeserializer，WebDataConvertConfig
public class IPageDeserializer extends StdDeserializer<IPage> { protected
IPageDeserializer(Class<?> vc) { super(vc); } /** * Method that can be called
to ask implementation to deserialize * JSON content into the value type this
serializer handles. * Returned instance is to be constructed by method itself.
* <p> * Pre-condition for this method is that the parser points to the * first
event that is part of value to deserializer (and which * is never JSON 'null'
literal, more on this below): for simple * types it may be the only value; and
for structured types the * Object start marker or a FIELD_NAME. * </p> * <p> *
The two possible input conditions for structured types result * from
polymorphism via fields. In the ordinary case, Jackson * calls this method when
it has encountered an OBJECT_START, * and the method implementation must
advance to the next token to * see the first field name. If the application
configures * polymorphism via a field, then the object looks like the
following. * <pre> * { * "@class": "class name", * ... * } * </pre> * Jackson
consumes the two tokens (the <tt>@class</tt> field name * and its value) in
order to learn the class and select the deserializer. * Thus, the stream is
pointing to the FIELD_NAME for the first field * after the @class. Thus, if you
want your method to work correctly * both with and without polymorphism, you
must begin your method with: * <pre> * if (p.getCurrentToken() ==
JsonToken.START_OBJECT) { * p.nextToken(); * } * </pre> * This results in the
stream pointing to the field name, so that * the two conditions align. * <p> *
Post-condition is that the parser will point to the last * event that is part
of deserialized value (or in case deserialization * fails, event that was not
recognized or usable, which may be * the same event as the one it pointed to
upon call). * <p> * Note that this method is never called for JSON null
literal, * and thus deserializers need (and should) not check for it. * *
@param p Parsed used for reading JSON content * @param ctxt Context that can be
used to access information about * this deserialization activity. * @return
Deserialized value */ @Override public IPage deserialize(JsonParser p,
DeserializationContext ctxt) throws IOException, JsonProcessingException {
JsonNode node = p.getCodec().readTree(p); String s = node.toString();
ObjectMapper om = new ObjectMapper(); Page page = om.readValue(s,Page.class);
return page; } } @Configuration public class WebDataConvertConfig extends
WebMvcConfigurationSupport { @Override public void
configureMessageConverters(List<HttpMessageConverter<?>> converters) {
converters.add(mappingJackson2HttpMessageConverter());
super.configureMessageConverters(converters); } @Bean public
MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter() {
MappingJackson2HttpMessageConverter converter = new
MappingJackson2HttpMessageConverter(); ObjectMapper mapper = new
ObjectMapper();
mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
SimpleModule module = new SimpleModule(); module.addDeserializer(IPage.class,
new IPageDeserializer(IPage.class)); mapper.registerModule(module);
converter.setSupportedMediaTypes(Arrays.asList(MediaType.APPLICATION_JSON,
MediaType.APPLICATION_JSON_UTF8,MediaType.APPLICATION_OCTET_STREAM));
converter.setObjectMapper(mapper); return converter; } }

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