映射< String，Object>的jackson xmlmapper，对特定标签做出反应 [英] jackson xmlmapper for map <String, Object>, react for specific tag

问题描述

我有这个xml结构:

    <Result>
      <ReferenceMin>4</ReferenceMin>
      <ReferenceMax>5.65</ReferenceMax>
      <PrecedingValue>3.25</PrecedingValue>
      <PrecedingDate><Date year="2017"  month="04"    day="21"/></PrecedingDate>
    </Result>

此xml来自无法控制的第三方服务，它可以包含新字段，或者现有字段可以消失，因此我无法为对象定义严格的结构.如我所见，除PrecedingDate外，所有字段都可以解析为字符串".

This xml come from 3-rd party service which can not be controlled, and it can contain new fields, or existing fields can disappear, so I can't define strict structure for object. As I can see, all fields can be parsed as "String" except PrecedingDate.

是否可以通过我的Cyustom策略将Jackson xmlMapper与PrecedingDate或Date字段一起使用?当前，它创建具有以下结构的对象:

Is it possible to teach jackson xmlMapper work with PrecedingDate or Date field by my cyustom strategy? Currently it create objects with this structure:

{PrecedingDate: Date: {year: 2017, month: 04, day: 21}}

我想获取java日期或即时信息或类似的信息.

I want to get java date or instant or something similar.

推荐答案

您可以实现自定义反序列化程序或使用JsonAnySetter批注.您可以在下面找到如何使用注释:

You can implement custom deserialiser or use JsonAnySetter annotation. How to use annotation you can find below:

import com.fasterxml.jackson.annotation.JsonAnySetter;
import com.fasterxml.jackson.dataformat.xml.XmlMapper;

import java.io.File;
import java.time.LocalDate;
import java.util.HashMap;
import java.util.Map;

public class XmlMapperApp {

    public static void main(String[] args) throws Exception {
        File xmlFile = new File("./resource/test.xml").getAbsoluteFile();

        XmlMapper xmlMapper = new XmlMapper();
        System.out.println(xmlMapper.readValue(xmlFile, Result.class));
    }
}

class Result {

    private Map<String, String> entries = new HashMap<>();
    private LocalDate precedingDate;

    public Map<String, String> getEntries() {
        return entries;
    }

    public LocalDate getPrecedingDate() {
        return precedingDate;
    }

    @JsonAnySetter
    public void setEntry(String key, Object value) {
        if ("PrecedingDate".equals(key)) {
            Map<String, String> date = (Map<String, String>)((Map) value).get("Date");
            precedingDate = LocalDate.of(
                    Integer.parseInt(date.get("year")),
                    Integer.parseInt(date.get("month")),
                    Integer.parseInt(date.get("day")));
        } else {
            entries.put(key, value.toString());
        }
    }

    @Override
    public String toString() {
        return "Result{" +
                "entries=" + entries +
                ", precedingDate=" + precedingDate +
                '}';
    }
}

上面的代码显示:

Result{entries={ReferenceMin=4, PrecedingValue=3.25, ReferenceMax=5.65}, precedingDate=2017-04-21}

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