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java - 使用重复键解析 json

问题描述

我正在尝试解析包含 java 中重复键的 Json 文件。我正在使用此答案中建议的方法Parsing a json which contains duplicate keys。如果我对 Json 进行硬编码，则该方法可以正常工作，但如果我从文件中读取它，则只会读取最后一个重复键。请帮助，因为我想从文件中读取 Json。提前致谢。代码：

public class am {
    public static  void main(String args[]) throws Exception
    {
        JSONParser parser = new JSONParser();


        Object obj = parser.parse(new FileReader("sample.json"));

        JSONObject a=JSONObject.fromObject(obj);
        JSONObject jsonObject=JSONObject.fromObject("{\n" +
                "  \"Data\": {\n" +
                "    \"A\": {\n" +
                "      \"B\": {\n" +
                "        \"C\": \"c\",\n" +
                "        \"D\": {}\n" +
                "      },\n" +
                "      \"E\": {\n" +
                "        \"F\": \"f\"\n" +
                "      },\n" +
                "      \"G\": {\n" +
                "        \"H\": \"h\"\n" +
                "      }\n" +
                "    },\"A\": {\n" +
                "      \"B\": {\n" +
                "        \"C\": \"x\",\n" +
                "        \"D\": {}\n" +
                "      },\n" +
                "      \"E\": {\n" +
                "        \"F\": \"y\"\n" +
                "      },\n" +
                "      \"G\": {\n" +
                "        \"H\": \"z\"\n" +
                "      }\n" +
                "    },\n" +
                "    
                "\n" +
                "  }\n" +
                "}");
        System.out.println("Json objects are:::"+a);
        System.out.println("Json objects are:::"+jsonObject);

    }
}

json文件：

{
  "Data": {
    "A": {
      "B": {
        "C": "c",
        "D": {}
      },
      "E": {
        "F": "f"
      },
      "G": {
        "H": "h"
      }
    },"A": {
      "B": {
        "C": "x",
        "D": {}
      },
      "E": {
        "F": "y"
      },
      "G": {
        "H": "z"
      }
    },

  }
}

输出：

Json objects are:::{"Data":{"A":{"B":{"C":"x","D":{}},"E":{"F":"y"},"G":{"H":"z"}}}}
Json objects are:::{"Data":{"A":[{"B":{"C":"c","D":{}},"E":{"F":"f"},"G":{"H":"h"}},{"B":{"C":"x","D":{}},"E":{"F":"y"},"G":{"H":"z"}}]}}

标签： javajson

解决方案

如果您没有限制使用外部 JSON 库而不是可以net.sf.json.JSONObject用来解析 JSON 字符串，它将接受带有重复键的 JSON。它将通过将重复值存储到数组中来保留它们。

JSONObject jsonObject = JSONObject.fromObject( "{\"Data\": {\"A\": {\"B\": {\"C\": \"c\",\"D\": {}},\"E\": {\"F\": \"f\"},\"G\": {\"H\": \"h\"}},\"A\": {\"B\": {\"C\": \"x\",\"D\": {}},\"E\": {\"F\": \"y\"},\"G\": {\"H\": \"z\"}}}}" );
System.out.println( "net.sf.json.JSONObject: " + jsonObject );

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