Question

我有一个庞大而复杂的JSON对象，如下所示：

{
    "FDN": [{
        "OT": 1,
        "CL": [{
            "K": [{
                "FID": 348,
                "VAL": "20822548"
            }, {
                "FID": "LANGUAGE_ID",
                "VAL": "FR"
            }]
        }],
        "NK": null,
        "SS": 0,
        "ITID": "NEWS",
        "TSID": 44969007,
        "DT": "20180504123302006"
    }, {
        "OT": 1,
        "CL": [{
            "K": [{
                "FID": 348,
                "VAL": "20822549"
            }, {
                "FID": "LANGUAGE_ID",
                "VAL": "AR"
            }]
        }],
        "NK": null,
        "SS": 0,
        "ITID": "NEWS",
        "TSID": 44969008,
        "DT": "20180504123302007"
    }, {
        "OT": 1,
        "CL": [{
            "K": [{
                "FID": 348,
                "VAL": "20822550"
            }, {
                "FID": "LANGUAGE_ID",
                "VAL": "FR"
            }]
        }],
        "NK": null,
        "SS": 0,
        "ITID": "NEWS",
        "TSID": 44969009,
        "DT": "20180504123302007"
    }, {
        "OT": 1,
        "CL": [{
            "K": [{
                "FID": 348,
                "VAL": "20822551"
            }, {
                "FID": "LANGUAGE_ID",
                "VAL": "AR"
            }]
        }],
        "NK": null,
        "SS": 0,
        "ITID": "NEWS",
        "TSID": 44969010,
        "DT": "20180504123302008"
    }, {
        "OT": 1,
        "CL": [{
            "K": [{
                "FID": 348,
                "VAL": "20822552"
            }, {
                "FID": "LANGUAGE_ID",
                "VAL": "FR"
            }]
        }],
        "NK": null,
        "SS": 0,
        "ITID": "NEWS",
        "TSID": 44969011,
        "DT": "20180504123302009"
    }, {
        "OT": 1,
        "CL": [{
            "K": [{
                "FID": 348,
                "VAL": "20822553"
            }, {
                "FID": "LANGUAGE_ID",
                "VAL": "FR"
            }]
        }],
        "NK": null,
        "SS": 0,
        "ITID": "NEWS",
        "TSID": 44969012,
        "DT": "20180504123302010"
    }, {
        "OT": 1,
        "CL": [{
            "K": [{
                "FID": 348,
                "VAL": "20822554"
            }, {
                "FID": "LANGUAGE_ID",
                "VAL": "FR"
            }]
        }],
        "NK": null,
        "SS": 0,
        "ITID": "NEWS",
        "TSID": 44969013,
        "DT": "20180504123302010"
    }, {
        "OT": 1,
        "CL": [{
            "K": [{
                "FID": 348,
                "VAL": "20822573"
            }, {
                "FID": "LANGUAGE_ID",
                "VAL": "AR"
            }]
        }],
        "NK": null,
        "SS": 0,
        "ITID": "NEWS",
        "TSID": 44969065,
        "DT": "20180504080929368"
    }, {
        "OT": 0,
        "CL": [{
            "K": [{
                "FID": 348,
                "VAL": "20822573"
            }, {
                "FID": "LANGUAGE_ID",
                "VAL": "AR"
            }]
        }],
        "NK": null,
        "SS": 0,
        "ITID": "NEWS",
        "TSID": 44969066,
        "DT": "20180504080929369"
    }, {
        "OT": 1,
        "CL": [{
            "K": [{
                "FID": 348,
                "VAL": "20822574"
            }, {
                "FID": "LANGUAGE_ID",
                "VAL": "AR"
            }]
        }],
        "NK": null,
        "SS": 0,
        "ITID": "NEWS",
        "TSID": 44969067,
        "DT": "20180504082130104"
    }]
}

从这一点来说，我只需要考虑＆＃34; CL＆＃34;像这样的单位：

"CL": [{
                "K": [{
                    "FID": 348,
                    "VAL": "20822573"
                }, {
                    "FID": "LANGUAGE_ID",
                    "VAL": "AR"
                }]
            }],

并检查LANGUAGE_ID是否为＆＃34; AR＆＃34;，然后添加相应密钥的相关值（20822573）＆＃34; FID：348＆＃34;到列表。只是一个例子：

 if(LANGUAGE_ID.equals("AR")){
         IdList.add("20822573");
     }

我无法做到这一点，因为两个键处于同一级别。

到目前为止，我的代码是：

public static void main(String[] a) throws IOException {
        FileReader jsonReader = new FileReader(new File("json.json"));
        Gson gson = new Gson();
        Map<String,String> fidMap = new HashMap<String, String>();
        JsonObject jsonObject = gson.fromJson(jsonReader, JsonObject.class);
        JsonArray fdnJsonArray = (JsonArray) jsonObject.get("FDN");

        fdnJsonArray.forEach(jsonElement -> {
            JsonArray clJsonArray = jsonElement.getAsJsonObject().get("CL").getAsJsonArray();
            clJsonArray.forEach(clJsonItem -> {
                JsonArray kJsonArray = clJsonItem.getAsJsonObject().get("K").getAsJsonArray();
                kJsonArray.forEach(kArrayElement -> {
                    String fid = kArrayElement.getAsJsonObject().get("FID").getAsString();
                    if(fid != null && !fid.isEmpty() && fid.equalsIgnoreCase("LANGUAGE_ID")) {
                        String val = kArrayElement.getAsJsonObject().get("VAL").getAsString();
                        System.out.println(fid + ":"+ val);
                    }
                });
            });
        });
    }

非常感谢您的帮助！

Answer 1

考虑使用jsonpath。获取CL对象的这个特定问题的一个简单示例就像$..CL一样简单。然后，您可以在普通的java中操作返回的对象。您可以在线快速对此进行原型设计here。要进一步优化jsonpath以包含语言ID，您可以在此处查看文档：{{3}}

使用Java有条件地访问相同级别的JsonElements

1 个答案: