How to solve the error of openfeign get request parameter dto

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Spring boot 2.3.3 is used in the project.

Use @ GetMapping and @ SpringQueryMap and transport DTO objects when invoking the service using feign, where the DTO object contains the LocalDateTime property, keeps reporting type conversion exceptions, and cannot invoke the service. There are many solutions, many online solutions are ineffective, generally are FastJson serialization and so on (maybe each project is different), solution process analysis will not be analyzed for the time being. Record it first, because it seems that many people on the Internet have encountered this problem. The following is the service provider

@ FeignClient (value = "user-service", path = "/ user/v1") public interface UserClient {@ GetMapping ("/") PageVO getUserList (@ SpringQueryMap UserDTO userDTO);} @ Data@ApiModel (value = "operating platform user list query parameters") public class UserDTO implements Serializable {private static final long serialVersionUID =-3767202379100110105L; @ ApiModelProperty (value = "user id") private Long id @ Size (max = 12, message = "nickName: maximum length of user nicknames is 12") @ ApiModelProperty (value = "user nicknames") private String nickName; @ ApiModelProperty (value = "Mobile number") private String phone; @ DateTimeFormat (pattern = "yyyy-MM-dd HH:mm:ss") @ ApiModelProperty (value = "creation time") private LocalDateTime createdAtStart @ DateTimeFormat (pattern = "yyyy-MM-dd HH:mm:ss") @ ApiModelProperty (value = "creation time ends") private LocalDateTime createdAtEnd; @ ApiModelProperty (value = "page number", required = true) private Integer page; @ ApiModelProperty (value = "number per page", required = true) private Integer size;}

Core focus: add a QueryMapEncoder

Import feign.Param;import feign.QueryMapEncoder;import feign.codec.EncodeException;import java.beans.IntrospectionException;import java.beans.Introspector;import java.beans.PropertyDescriptor;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;import java.time.LocalDateTime;import java.time.format.DateTimeFormatter;import java.util.*;public class LocalDateTimeQueryMapEncoder implements QueryMapEncoder {private final Map, ObjectParamMetadata > (); private final DateTimeFormatter dtf = DateTimeFormatter.ofPattern ("yyyy-MM-dd HH:mm:ss") Override public Map encode (Object object) throws EncodeException {try {ObjectParamMetadata metadata = getMetadata (object.getClass ()); Map propertyNameToValue = new HashMap (); for (PropertyDescriptor pd: metadata.objectProperties) {Method method = pd.getReadMethod (); Object value = method.invoke (object) If (value! = null & & value! = object) {Param alias = method.getAnnotation (Param.class); String name = alias! = null? Alias.value (): pd.getName (); if ("java.time.LocalDateTime" .equals (method.getReturnType (). GetName () {/ / propertyNameToValue.put (name, "2020-10-07 01:01:00"); propertyNameToValue.put (name, dtf.format ((LocalDateTime) value)) } else {propertyNameToValue.put (name, value);} return propertyNameToValue;} catch (IllegalAccessException | IntrospectionException | InvocationTargetException e) {throw new EncodeException ("Failure encoding object into query map", e) } private ObjectParamMetadata getMetadata (Class objectType) throws IntrospectionException {ObjectParamMetadata metadata = classToMetadata.get (objectType); if (metadata = = null) {metadata = ObjectParamMetadata.parseObjectType (objectType); classToMetadata.put (objectType, metadata);} return metadata;} private static class ObjectParamMetadata {private final List objectProperties Private ObjectParamMetadata (List objectProperties) {this.objectProperties = Collections.unmodifiableList (objectProperties);} private static ObjectParamMetadata parseObjectType (Class type) throws IntrospectionException {List properties = new ArrayList (); for (PropertyDescriptor pd: Introspector.getBeanInfo (type). GetPropertyDescriptors ()) {boolean isGetterMethod = pd.getReadMethod ()! = null & &! "class" .equals (pd.getName ()) If (isGetterMethod) {properties.add (pd);}} return new ObjectParamMetadata (properties) } @ Configurationpublic class CustomFeignConfig {@ Bean public Feign.Builder feignBuilder () {return Feign.builder () .queryMapEncoder (new LocalDateTimeQueryMapEncoder ()) .retryer (Retryer.NEVER_RETRY);} at this point, I believe you have a better understanding of "how to solve errors in the openfeign get request parameter dto". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!