Cannot deserialize value of type `java.time.LocalDateTime` from String "2023-05-22 17:11:44" 全局配置解决方案

这个问题是因为在反序列化的过程中，无法将字符串 "2023-05-22 17:11:44" 转换为 LocalDateTime 类型。解决方案可以在全局配置文件中配置一个 LocalDateTime 的序列化和反序列化器。

首先，创建一个 LocalDateTime 序列化器：

import java.io.IOException;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;

public class LocalDateTimeSerializer extends JsonSerializer<LocalDateTime> {

    private static final DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");

    @Override
    public void serialize(LocalDateTime value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
        gen.writeString(formatter.format(value));
    }

}

然后，创建一个 LocalDateTime 反序列化器：

import java.io.IOException;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;

public class LocalDateTimeDeserializer extends JsonDeserializer<LocalDateTime> {

    private static final DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");

    @Override
    public LocalDateTime deserialize(JsonParser p, DeserializationContext ctxt) throws IOException {
        String str = p.getText().trim();
        return LocalDateTime.parse(str, formatter);
    }

}

最后，在全局配置文件中注册这两个序列化器和反序列化器：

spring:
  jackson:
    date-format: yyyy-MM-dd HH:mm:ss
    serialization:
      write-dates-as-timestamps: false
    modules:
      - com.fasterxml.jackson.datatype.jsr310.JavaTimeModule
    property-naming-strategy: SNAKE_CASE
    deserialization:
      local-date-time:
        date-time-formatter: "yyyy-MM-dd HH:mm:ss"
        type: java.time.LocalDateTime
        key-deserializer: com.example.LocalDateTimeDeserializer
        value-deserializer: com.example.LocalDateTimeDeserializer
      creators:
        use-big-decimal-for-floats: true

这样就可以在反序列化时将字符串转换为 LocalDateTime 类型了。