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
计算
安全
数据库
网络和加速
企业服务
@FeignClient(value = "user-service", path = "/user/v1")
public interface UserClient {
@GetMapping("/")
PageVO<UserVO> 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<Class<?>, ObjectParamMetadata> classToMetadata =
new HashMap<Class<?>, ObjectParamMetadata>();
private final DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
@Override
public Map<String, Object> encode(Object object) throws EncodeException {
try {
ObjectParamMetadata metadata = getMetadata(object.getClass());
Map<String, Object> propertyNameToValue = new HashMap<String, Object>();
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<PropertyDescriptor> objectProperties;
private ObjectParamMetadata(List<PropertyDescriptor> objectProperties) {
this.objectProperties = Collections.unmodifiableList(objectProperties);
}
private static ObjectParamMetadata parseObjectType(Class<?> type)
throws IntrospectionException {
List<PropertyDescriptor> properties = new ArrayList<PropertyDescriptor>();
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);
}
}到此，相信大家对“openfeign get请求参数dto出现错误怎么解决”有了更深的了解，不妨来实际操作一番吧！这里是亿速云网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！
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原文链接：https://my.oschina.net/bozhi/blog/4640192
