SpringBoot中Java8LocalDateTime序列化问题

LoginController页面如下：

public Object login(@RequestBody User user) {
return xxxx;
}
User 类属性：
private LocalDateTime birthDay; //出生日期

postman测试：

传入日期 "birthDay": "2014-01-01T01:00:00"， 后台可以接收

传入"birthDay": "2014-01-01 01:00:00"， 页面有如下异常信息：

"message": "JSON parse error: Can not deserialize value of type java.time.LocalDateTime from String \"2018-11-09 12:36:28.242\": Text '2018-11-09 12:36:28.242' could not be parsed at index 10;
nested exception is com.fasterxml.jackson.databind.exc.InvalidFormatException: Can not deserialize value of type java.time.LocalDateTime from String \"2018-11-09 12:36:28.242\":
Text '2018-11-09 12:36:28.242' could not be parsed at index 10\n at [Source: java.io.PushbackInputStream@9ea12ad;

自己确实花了点时间。终于解决：

本文中用的序列化方式为：

Maven: com.fasterxml.jackson.core:jackson-databind:2.8.8

@Bean
public ObjectMapper objectMapper() {
bjectMapper objectMapper = new ObjectMapper();
objectMapper.registerModule(new Jdk8Module());
objectMapper.registerModule(new JavaTimeModule());
objectMapper.registerModule(new GuavaModule());
objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
objectMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
}

1.为什么传2014-01-01T01:00:00 这个字符串可以被后台解析呢？

原因在JavaTimeModule类中：

默认配置对LocalDateTime配置序列化和反序列化类

LocalDateTimeSerializer类默认日期格式，有个 T 拼接字符，问题就出在这里，所以2014-01-01 01:00:00后台反序列化失败

解决代码：自己指定日期解析格式

ObjectMapper objectMapper = new ObjectMapper();
objectMapper.registerModule(new Jdk8Module());
JavaTimeModule module = new JavaTimeModule();
module.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
module.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
objectMapper.registerModule(module);