com.fasterxml.jackson.databind.exc.InvalidFormatException解决方案

客户端使用fastjson进行序列化，服务端使用jackson反序列化失败。报错。

Caused by: com.fasterxml.jackson.databind.exc.InvalidFormatException: Cannot deserialize value of type `java.util.Date` from String "2022-04-04 04:04:04": not a valid representation (error: Failed to parse Date value '2022-04-04 04:04:04': Cannot parse date "2022-04-04 04:04:04": while it seems to fit format 'yyyy-MM-dd'T'HH:mm:ss.SSSZ', parsing fails (leniency? null))

原因：

fastjson默认使用的序列化格式：

public static String           DEFFAULT_DATE_FORMAT = "yyyy-MM-dd HH:mm:ss";

jackson默认支持的日期反序列格式：

("yyyy-MM-dd'T'HH:mm:ss.SSSZ", "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", "EEE, dd MMM yyyy HH:mm:ss zzz", "yyyy-MM-dd"))

jackson默认的日期反序列不支持yyyy-MM-dd HH:mm:ss 这种格式，所以反序列化失败

解决办法一：重写jackson反序列化

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;import java.io.IOException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;/*** @version 1.0.0* @description 重写反序列化* @date 2018/12/25 9:51**/public class CustomJsonDateDeserializer extends JsonDeserializer<Date> {@Overridepublic Date deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException {SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");String date = jp.getText();try {return format.parse(date);} catch (ParseException e) {throw new RuntimeException(e);}}
}

在需要的date属性上添加注解：

   @JsonDeserialize(using = CustomJsonDateDeserializer.class)private Date createTime;使用这种方式，需要重写上面反序列化抽象类

解决办法二：直接使用jackson注解，不需要重写反序列化

@JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")private Date createTime;

GMT+8表示时区，东八区

解决办法三：直接使用fastjson注解，不要重写反序列化

@JSONField(format = “yyyy-MM-dd HH:mm:ss”)
private Date createTime;

添加依赖：

<!-- fastjson --><dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.32</version></dependency><!-- jackson--><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.6.4</version></dependency>

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