在Java中将JSON解析为Jackson的Map映射 [英] Parse JSON as Map of Map for Jackson in Java

问题描述

如何像这样解析JSON

How to parse JSON like:

{
  "key1": {
    "subKey1" : {
      "field1": "value",
      "field2": "value"
    },
    "subKey2": {
      "field1": "value",
      "field2": "value"
    }
  },
  "key2": {
    "subKey1" : {
      "field1": "value",
      "field2": "value"
    },
    "subKey2": {
      "field1": "value",
      "field2": "value"
    }
  }
}  

获得如下的对象结构:

  // key*       subKey*
Map<String, Map<String, DataType>> map;


public class DataType {

    private String field1;
    private String field2;

}

如果此结构太复杂，如何解析 至少是DataType的地图?

If this structure is too complicated, how to parse just a map of DataType at least?

推荐答案

解决方案非常简单:

ObjectMapper jsonMapper = new ObjectMapper();
TypeReference<Map<String, Map<String, DataType>>> typeRef = 
        new TypeReference<Map<String, Map<String, DataType>>>() {};
Map<String, Map<String, DataType>> configMap = jsonMapper.readValue(strJson, typeRef);

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