openfeignget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!
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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("/") PageVOgetUserList(@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); } } }
@Configuration public class CustomFeignConfig { @Bean public Feign.Builder feignBuilder() { return Feign.builder() .queryMapEncoder(new LocalDateTimeQueryMapEncoder()) .retryer(Retryer.NEVER_RETRY); } }
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