在Java中使用getJSONArray（）和getJSONObject（）从JSON文件获取元素

我想浏览下面的json文件，并将该部分保存在“坐标”之后。

json文件：

{"type": "FeatureCollection","features": [{"type": "Feature","properties": {},"geometry": {"type": "LineString","coordinates": [[4.354282,52.032195],[4.354087,52.032462],[4.353783,52.032962],[4.353579,52.033437],[4.353333,52.034151],[4.352991,52.03545],[4.352517,52.037002],[4.352442,52.037352],[4.352368,52.0378],[4.352336,52.038238],[4.352331,52.039962],[4.352346,52.040706]
    ]
  }
}

] }

我见过使用getJSONArray（）和getJSONObject（）和的代码。这些信息帮助我选择（在我的例子中）几何体树

到目前为止，我的代码（test2.geojson是上面提到的json文件）：

但是，这只会重新排列文件并将第一部分追加到文件末尾

[{"geometry":{"coordinates":[[4.354282,52.032195],[4.354087,52.032462],[4.353783,52.032962],[4.353579,52.033437],[4.353333,52.034151],[4.352991,52.03545],[4.352517,52.037002],[4.352442,52.037352],[4.352368,52.0378],[4.352336,52.038238],[4.352331,52.039962],[4.352346,52.040706]],"type":"LineString"},"type":"Feature","properties":{}}]

获得所需输出的任何解决方案：

[[4.354282,52.032195],[4.354087,52.032462],[4.353783,52.032962],[4.353579,52.033437],[4.353333,52.034151],[4.352991,52.03545],[4.352517,52.037002],[4.352442,52.037352],[4.352368,52.0378],[4.352336,52.038238],[4.352331,52.039962],[4.352346,52.040706]
    ]
  }
}

] }

提前谢谢。 干杯

由于“geometry”是一个json对象{}，“coordinates”是一个json数组[]

你应该做什么

JSONArray jsonArray = obj.getJSONArray("features");
JSONArray resultArray = jsonArray.getJSONObject[0].getJSONObject("geometry").getJSONArray("coordinates")

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getJSONObject（“几何体”）给出以下错误。JSONArray类型中的方法getJSONObject（int）不适用于参数（字符串）。我正在使用org.json库。首先从jsonArray获取第一个对象，然后应用我的代码。谢谢您的帮助。getJSONArray[0]正在抛出：getJSONArray无法解析或不是字段。您是否也在使用org.json库？当然。@Camelaria ops，您应该使用jsonArray.getJSONObject（0）…而不是jsonArray.getJSONArray（0）…我的错，但是您也可以很容易地发现这一点~

JSONArray jsonArray = obj.getJSONArray("features");
JSONArray resultArray = jsonArray.getJSONObject[0].getJSONObject("geometry").getJSONArray("coordinates")