openfeign get请求参数dto出现错误怎么解决

本篇内容主要讲解"openfeign get请求参数dto出现错误怎么解决"，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习"openfeign get请求参数dto出现错误怎么解决"吧!

项目中使用的是spring boot 2.3.3,spring-cloud Hoxton.SR8.

在使用feign调用服务时 使用@GetMapping 和 @SpringQueryMap 和传输DTO对象，其中DTO对象中包含LocalDateTime属性，一直报类型转换异常，无法调用服务。解决方法有很多，找了网上很多解决办法都没效果，大体都是FastJson 序列化之类的（可能每个项目差异吧）， 解决过程分析暂不分析吧。先行记录一下，因为看到网上很多人貌似都遇到过这个问题。以下是服务提供方

@FeignClient(value = "user-service", path = "/user/v1")public interface UserClient {@GetMapping("/")PageVO getUserList(@SpringQueryMap UserDTO userDTO);}

@Data@ApiModel(value = "运营平台用户列表查询参数")public class UserDTO implements Serializable {    private static final long serialVersionUID = -3767202379100110105L;    @ApiModelProperty(value = "用户id")    private Long id;    @Size(max = 12, message = "nickName:用户昵称最大长度为12")    @ApiModelProperty(value = "用户昵称")    private String nickName;    @ApiModelProperty(value = "手机号码")    private String phone;    @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")    @ApiModelProperty(value = "创建时间开始")    private LocalDateTime createdAtStart;    @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")    @ApiModelProperty(value = "创建时间结束")    private LocalDateTime createdAtEnd;    @ApiModelProperty(value = "页码", required = true)    private Integer page;    @ApiModelProperty(value = "每页条数", required = true)    private Integer size;}

核心重点：新增一个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> classToMetadata =            new HashMap, 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);    }}

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