映射<字符串、哈希集<字符串>>到 JSON，&漂亮的印刷品 [英] Map<String, HashSet<String>> to JSON, & Pretty Print

问题描述

我正在尝试使我的数据集与此示例相对应:

I'm trying to make my dataset correspond to this example:

var family = [{
    "name" : "Jason",
    "age" : "24",
    "gender" : "male"
},
{
    "name" : "Kyle",
    "age" : "21",
    "gender" : "male"
}];

我有一个 Map<String, HashSet<String>> 名称和与这些名称可以引用的特定实体相对应的唯一字母数字值，我们将这些条目称为ID".

I have a Map<String, HashSet<String>> of Names and unique alpha-numeric values correponding to specific entities to which those names could refer, let's call these entry items "IDs".

例如，Fyodor Mikhailovich Dostoyevsky 可能与 ID Q626 有关，因为这是一个非常具体的参考，没有多少广为人知的数字名称.而 Bush 可能会附加到 G027、Q290 和 Q118，可能是指人、啤酒、还有灌木，没有特别的顺序.

So for instance, Fyodor Mikhailovich Dostoyevsky would perhaps be related to the ID Q626, because that's a very specific reference, there aren't many widely known figures with that name. Whereas, Bush might be attached to G027, Q290, and Q118, referencing perhaps the man, the beer, and the shrub, in no particular order.

看起来像这样(真实的要大得多):

It looks like this (the real one is much bigger):

[Rao=[Q7293658, , Q7293657, Q12953055, Q3531237, Q4178159, Q1138810, Q579515, Q3365064, Q7293664, Q1133815], Hani Durzy=[], Louise=[, Q1660645, Q130413, Q3215140, Q152779, Q233203, Q7871343, Q232402, Q82547, Q286488, Q156723, Q3263649, Q456386, Q233192, Q14714149, Q12125864, Q57669, Q168667, Q141410, Q166028], Reyna=[Q7573462, Q2892895, Q363257, Q151944, Q3740321, Q2857439, Q1453358, Q7319529, Q733716, Q16151941, Q7159448, Q5484172, Q6074271, Q1753185, Q7319532, Q5171205, Q3183869, Q1818527, Q251862, Q3840414, Q5271282, Q5606181]]

<小时>

使用 Jackson 我尝试这样:

---

Using Jackson I tried like this:

Map<String, HashSet<String>>  map = q_valMap;
mapper.writeValue(new File("JSON_Output/user.json"), map);

但这似乎是错误的，因为我的输出都混杂在一起，即

But this seems wrong, as my output was all jumbled together, i.e.

{"Rao":["Q7293658","","Q7293657","Q12953055","Q3531237","Q4178159","Q1138810","Q579515","Q3365064","Q7293664","Q1133815"],"Hani Durzy":[""],"Louise":["","Q1660645","Q130413","Q3215140","Q152779","Q233203","Q7871343","Q232402","Q82547","Q286488","Q156723","Q3263649","Q456386","Q233192","Q14714149","Q12125864","Q57669","Q168667","Q141410","Q166028"],"Reyna":["Q7573462","Q2892895","Q363257","Q151944","Q3740321","Q2857439","Q1453358","Q7319529","Q733716","Q16151941","Q7159448","Q5484172","Q6074271","Q1753185","Q7319532","Q5171205","Q3183869","Q1818527","Q251862","Q3840414","Q5271282","Q5606181"]}

我只需要迭代地填充这个 JSON 对象吗?

Do I just have to populate this JSON object iteratively?

和上面的例子一样，我认为它应该看起来像这样，虽然下面只是一个伪代码描述，也就是说，不完全是这个，而是类似的:

Like the example up top, I think it should look something like this, though what follows is only a pseudocodish characterization, which is to say, not exactly this but something similar:

{
    key: "Rao"
    value:  ["Q7293658","","Q7293657","Q12953055","Q3531237","Q4178159","Q1138810","Q579515","Q3365064","Q7293664","Q1133815"]

    key: "Hani Durzy"
    value: [""]

    key: "Louise"
    value: ["","Q1660645","Q130413","Q3215140","Q152779","Q233203","Q7871343","Q232402","Q82547","Q286488","Q156723","Q3263649","Q456386","Q233192","Q14714149","Q12125864","Q57669","Q168667","Q141410","Q166028"]

    key: "Reyna"
    value: ["Q7573462","Q2892895","Q363257","Q151944","Q3740321","Q2857439","Q1453358","Q7319529","Q733716","Q16151941","Q7159448","Q5484172","Q6074271","Q1753185","Q7319532","Q5171205","Q3183869","Q1818527","Q251862","Q3840414","Q5271282","Q5606181"]
}

不对吗?

更新

public class JsonMapFileExample 
{
    public static void map(Map<String, HashSet<String>> q_valMap ) 
    {

        ObjectMapper mapper = new ObjectMapper();


        ArrayNode array = mapper.createArrayNode();
        for ( Entry entry: q_valMap.entrySet() ) 
        {
          ObjectNode node = mapper.createObjectNode()
              .put("name", entry.getKey())
              .put("ids", entry.getValue());
          array.add(node);
        }
        mapper.writeValue("/home/matthias/Workbench/SUTD/nytimes_corpus/wdtk-parent/wdtk-examples/JSON_Output/user.json", array);

    }
}


class MyEntity
{
    private String name;
    Set<String> value; // use names that you want in the result JSON

    //constructors
    public MyEntity() 
    {

    }
    public MyEntity(String name) 
    {
        this.name = name;
    }

    //getters
    public String getName() 
    {
        return this.name;
    }
    public Set<String>  getValue() 
    {
        return this.value;
    }

    //setters
    public void setName(String name) 
    {
        this.name = name;
    }
    public void setValue(Set<String> value) 
    {
        this.value = value;
    }
}

推荐答案

您可以手动设置键名，例如:

You could manually set the key names, something like:

ArrayNode array = mapper.createArrayNode();
for (Entry entry: yourMap.entries()) {
  ObjectNode node = mapper.createObjectNode()
      .put("name", entry.key())
      .putPOJO("ids", entry.value());
  array.add(node);
}
mapper.writeValue(file, array);

或者，您可以为您的数据创建一个类

Alternatively, you could create a class for your data

class MyEntity {
  String name;
  Set<String> ids; // use names that you want in the JSON result
  // getters, setters if necessary
}

将您的数据映射转换为 MyEntity 列表，然后使用 Jackson ObjectMapper 创建 JSON，如 mapper.writeValue(file, listOfMyEntities)，输出会是这样的

Transform your data map into a list of MyEntity, then use Jackson ObjectMapper to create JSON like mapper.writeValue(file, listOfMyEntities), the output would be like

[
  {
    "name": "some name here",
    "ids": ["id1", "id2", ...]  
  }
  // more elements here
]

这篇关于映射&lt;字符串、哈希集&lt;字符串&gt;&gt;到 JSON，&amp;漂亮的印刷品的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！