实例代码如下:

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="https://js.arcgis.com/4.23/esri/themes/light/main.css">
    <script src="https://js.arcgis.com/4.23/"></script>
    <title>view-Popup-code</title>
    <style>
        html,
        body,
        #viewDiv {
            padding: 0;
            margin: 0;
            height: 100%;
            width: 100%;
        }
    </style>
</head>

<body>
    <script>
        require([
            "esri/config", "esri/Map", "esri/views/MapView",
            "esri/tasks/Locator", "esri/layers/GeoJSONLayer"
        ], function (esriConfig, Map, MapView, Locator, GeoJSONLayer) {
            const map = new Map({
                basemap: "streets" // Basemap layer service
            });
            const view = new MapView({
                map: map,
                center: [116, 42], // Longitude, latitude 中国中部
                zoom: 5, // Zoom level
                container: "viewDiv" // Div element
            });
            const geojsonlayer = new GeoJSONLayer({
                url: "./data/test.json",
            });
            map.add(geojsonlayer)
        });
    </script>
    <div id="viewDiv"></div>
</body>

</html>

数据的存放位置如图所示:

ArcObjects SDK for Java 加载geodatabase文件_json

显示效果如图如图所示:

说明,如果直接用浏览器打开你创建的html文件是无法加载json数据的,因为json数据需要被发布出来,最简单的方式是使用vscode 的live Server插件,以另一种是用发布程序例如 IIS,tomcat 发布。

如果没有现成的geojson文件,只有坐标数据该如何创建geojsonlayer,实例代码如下:

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="https://js.arcgis.com/4.23/esri/themes/light/main.css">
    <script src="https://js.arcgis.com/4.23/"></script>
    <title>view-Popup-code</title>
    <style>
        html,
        body,
        #viewDiv {
            padding: 0;
            margin: 0;
            height: 100%;
            width: 100%;
        }
    </style>
</head>

<body>
    <script>
        require([
            "esri/config", "esri/Map", "esri/views/MapView",
            "esri/tasks/Locator", "esri/layers/GeoJSONLayer"
        ], function (esriConfig, Map, MapView, Locator, GeoJSONLayer) {
            const map = new Map({
                basemap: "streets" // Basemap layer service
            });
            const view = new MapView({
                map: map,
                center: [116, 42], // Longitude, latitude 中国中部
                zoom: 5, // Zoom level
                container: "viewDiv" // Div element
            });
            const geojsonlayer = new GeoJSONLayer({
                url: "./data/test.json",
            });
            map.add(geojsonlayer)
            const geojson = {
                type: "FeatureCollection",
                features: [
                    {
                        type: "Feature",
                        id: 1,
                        geometry: {
                            type: "Polygon",
                            coordinates: [
                                [
                                    [100.0, 41.0],
                                    [101.0, 41.0],
                                    [101.0, 42.0],
                                    [100.0, 42.0],
                                    [100.0, 41.0]
                                ],
                                [
                                    [105.0, 41.0],
                                    [106.0, 41.0],
                                    [106.0, 42.0],
                                    [105.0, 42.0],
                                    [105.0, 41.0]
                                ]
                            ]
                        },
                        properties: {
                            prop0: "value0",
                            name: "river"
                        }
                    }
                ]
            };

            // create a new blob from geojson featurecollection
            const blob = new Blob([JSON.stringify(geojson)], {
                type: "application/json"
            });

            // URL reference to the blob
            const url = URL.createObjectURL(blob);

            const geojsonlayer1 = new GeoJSONLayer({
                url:url,
            });
            map.add(geojsonlayer1)
        });
    </script>
    <div id="viewDiv"></div>
</body>

</html>

主要分三步,1,组织json数据,2,通过blob创建url,3,创建图层,效果如下

 可以看到显示出了两个矩形。这是在二维模型下,那么看一下三维模型下,是什么情况。

三维模式就是创建一个sceneview 而不是mapview

创建view 的代码修改如下,记得添加SceneView的引入

const view = new SceneView({
                container: "viewDiv",
                center: [116, 42],
                map: map,
                zoom: 4
            });

ArcObjects SDK for Java 加载geodatabase文件_json_02

显示结果如下,第二个 矩形没有显示填充部分,仔细看值显示了外框,因为外框是白色的,不易被发现。

ArcObjects SDK for Java 加载geodatabase文件_数据_03

造成这个现象的原因具体不太清楚,但是有解决方案,解决方案是,每个面创建一个feature,而不是把所有的面都放在一个feature的coordinates数组内,主要是修改geojson 数据,修改代码如下:

const geojson = {
                type: "FeatureCollection",
                features: [
                    {
                        type: "Feature",
                        id: 1,
                        geometry: {
                            type: "Polygon",
                            coordinates: [
                                [
                                    [100.0, 41.0],
                                    [101.0, 41.0],
                                    [101.0, 42.0],
                                    [100.0, 42.0],
                                    [100.0, 41.0]
                                ]
                            ]
                        },
                        properties: {
                            prop0: "value0",
                            name: "river"
                        }
                    },{
                        type: "Feature",
                        id: 2,
                        geometry: {
                            type: "Polygon",
                            coordinates: [
                                [
                                    [105.0, 41.0],
                                    [106.0, 41.0],
                                    [106.0, 42.0],
                                    [105.0, 42.0],
                                    [105.0, 41.0]
                                ]
                            ]
                        },
                        properties: {
                            prop0: "value0",
                            name: "river"
                        }
                    }
                ]
            };

显示效果如下: