当我尝试将POST请求传递给Spring控制器的值从String反序列化为OffsetDateTime时,我收到此异常 .
这是我的例外:
Failed to convert value of type 'java.lang.String' to required type 'java.time.OffsetDateTime';
nested exception is org.springframework.core.convert.ConversionFailedException:
Failed to convert from type [java.lang.String] to
type [@org.springframework.web.bind.annotation.RequestParam java.time.OffsetDateTime]
for value '2018-03-02T14:12:50.789+01:00';
nested exception is java.lang.IllegalArgumentException:
Parse attempt failed for value [2018-03-02T14:12:50.789+01:00]
我使用的是Spring-Boot - 2.0.1.BUILD-SNAPSHOT的最新版本
这是我的 JacksonConfig.java
package com.divinedragon.jackson.config;
import static com.fasterxml.jackson.databind.DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES;
import static com.fasterxml.jackson.databind.DeserializationFeature.READ_UNKNOWN_ENUM_VALUES_AS_NULL;
import static com.fasterxml.jackson.databind.PropertyNamingStrategy.SNAKE_CASE;
import static com.fasterxml.jackson.databind.SerializationFeature.WRAP_ROOT_VALUE;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.util.ISO8601DateFormat;
import com.fasterxml.jackson.datatype.jdk8.Jdk8Module;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import com.fasterxml.jackson.module.paramnames.ParameterNamesModule;
@Configuration
public class JacksonConfig {
@Bean(name = "jacksonConverter")
public MappingJackson2HttpMessageConverter jacksonConverter(final ObjectMapper objectMapper) {
final MappingJackson2HttpMessageConverter httpMessageConverter = new MappingJackson2HttpMessageConverter();
httpMessageConverter.setObjectMapper(objectMapper);
return httpMessageConverter;
}
@Bean
@Primary
public ObjectMapper objectMapper() {
final ObjectMapper mapper = new ObjectMapper();
mapper.enable(READ_UNKNOWN_ENUM_VALUES_AS_NULL);
mapper.disable(FAIL_ON_UNKNOWN_PROPERTIES);
mapper.disable(WRAP_ROOT_VALUE);
mapper.setDateFormat(new ISO8601DateFormat());
mapper.setPropertyNamingStrategy(SNAKE_CASE);
mapper.registerModule(new Jdk8Module());
mapper.registerModule(new JavaTimeModule());
mapper.registerModule(new ParameterNamesModule());
return mapper;
}
}
这是我的 JacksonController.java
,它是一个Spring REST控制器 .
package com.divinedragon.jackson.controller;
import java.time.OffsetDateTime;
import java.util.Collections;
import java.util.Map;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class JacksonController {
@GetMapping(path = "/get")
public Map<String, OffsetDateTime> getDates() {
return Collections.singletonMap("createdAt", OffsetDateTime.now());
}
@PostMapping(path = "/post")
public Map<String, OffsetDateTime> postDates(@RequestParam("created_at") final OffsetDateTime createdAt) {
return Collections.singletonMap("createdAt", createdAt);
}
}
这个应用程序运行,当我向 /get
终点发出请求时,我正确地使用Jackson序列化了日期值 .
-> curl -s http://localhost:8080/get | python -m json.tool
{
"createdAt": "2018-03-02T14:12:50.789+01:00"
}
当我使用 /post
endpoints 并传递日期值时,我得到上述异常:
-> curl -s -X POST http://localhost:8080/post --data-urlencode 'created_at=2018-03-02T14:12:50.789+01:00' | python -m json.tool
{
"error": "Bad Request",
"message": "Failed to convert value of type 'java.lang.String' to required type 'java.time.OffsetDateTime'; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.String] to type [@org.springframework.web.bind.annotation.RequestParam java.time.OffsetDateTime] for value '2018-03-02T14:12:50.789+01:00'; nested exception is java.lang.IllegalArgumentException: Parse attempt failed for value [2018-03-02T14:12:50.789+01:00]",
"path": "/post",
"status": 400,
"timestamp": "2018-03-02T13:15:38Z"
}
有人可以指导我如何使用Jackson反序列化将值转换为OffsetDateTime?
1 回答
似乎没有办法让 Jackson 拦截转换
String
到OffsetDateTime
通过@RequestParam
传递 .为了使这项工作,我最终在post here的帮助下编写了我自己的转换器 .
这是我的转换器:
另外,为了让Jackson也符合相同的
DateTimeFormat
,我更新了我的Jackson配置 .我要知道的一件很简单的事情是,如果你想更新序列化/反序列化的格式,这是行不通的 .
所以,我最终为此目的编写了自定义Serializer / Deserializer,然后覆盖了
JavaTimeModule
的默认值 .这是我更新的
JacksonConfig.java
希望有一天能帮助某人 .