配置Jackson解析多种日期格式 [英] Configure Jackson to parse multiple date formats

问题描述

我正在一个项目中，JSON有效负载中返回的日期格式不一致(这是另一个问题).我正在研究的项目使用Jackson来解析JSON响应.现在，我已经编写了一些解/序列化器来处理它，但这并不优雅.

I am working on a project where the date formats returned in JSON payloads aren't consistent (that's another issue all together). The project I'm working on uses Jackson to parse the JSON responses. Right now I've written a few de/serializers to handle it but it's not elegant.

我想知道是否有一种方法可以为Jackson设置一组可能的日期格式以解析特定的响应，而不是为每种格式编写几个单独的反序列化器.类似于 GSON如何处理此问题中的问题

I want to know whether there's a way to configure Jackson with a set of possible date formats to parse for a particular response rather than writing several separate deserializers for each format. Similar to how GSON handles the problem in this question

推荐答案

这是Jackson多日期格式序列化程序.

Here is a Jackson Multi Date Format Serializer.

import java.io.IOException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Date;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;

public class MultiDateDeserializer extends StdDeserializer<Date> {
    private static final long serialVersionUID = 1L;

    private static final String[] DATE_FORMATS = new String[] {
        "MMM dd, yyyy HH:mm:ss",
        "MMM dd, yyyy"
    };

    public MultiDateDeserializer() {
        this(null);
    }

    public MultiDateDeserializer(Class<?> vc) {
        super(vc);
    }

    @Override
    public Date deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException {
        JsonNode node = jp.getCodec().readTree(jp);
        final String date = node.textValue();

        for (String DATE_FORMAT : DATE_FORMATS) {
            try {
                return new SimpleDateFormat(DATE_FORMAT).parse(date);
            } catch (ParseException e) {
            }
        }
        throw new JsonParseException(jp, "Unparseable date: \"" + date + "\". Supported formats: " + Arrays.toString(DATE_FORMATS));
    }
}

您可以通过对字段进行如下注释来简单地使用它:

You can use this simply by annotating a field as follows:

@JsonProperty("date") @JsonDeserialize(using = MultiDateDeserializer.class) final Date date,

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