使用 Java 将 GeoJSON 坐标中的纬度和经度值分别提取为所需的格式

Question

我正在尝试将 GeoJSON 坐标拆分为单独的纬度和经度值，以达到所需的格式（如所需输出中所示）。

我有一个 GeoJSON 文件，通过它我只提取坐标值。这些坐标值存储为字符串变量，如下所示 GeoJSON : ":[[[7.365046,46.948655],[7.365046,46.949254],[7.367558,46.949254],[7.367558,46.948655],[7.365046,46.948655]]]}}：如何从给定的字符串中分别提取纬度和经度的特定值。从 GeoJSON 文件中提取坐标的代码片段如下所示：

String GeoJSON = GeoJSONFromFile().split("coordinates")[1];

System.out.println("GeoJSON : " + GeoJSON );

//Splitting within the brackets

String delims = "\\[(.*?)\\]";

String[] tokens = GeoJSON.split(delims);

GeoJSON = GeoJSON.split("}")[0];

我想要实现的预期输出如下：

\"points\": [\n" +

"            {\n" +

"              \"@type\": \"Point\",\n" +

"              \"lat\": 46.948655,\n" +

"              \"lon\": 7.365046\n" +

"            },\n" +

"            {\n" +

"              \"@type\": \"Point\",\n" +

"              \"lat\": 46.949254,\n" +

"              \"lon\": 7.365046\n" +

"            },\n" +

"            {\n" +

"              \"@type\": \"Point\",\n" +

"              \"lat\": 46.949254,\n" +

"              \"lon\": 7.367558\n" +

"            },\n" +

"            {\n" +

"              \"@type\": \"Point\",\n" +

"              \"lat\": 46.948655,\n" +

"              \"lon\": 7.367558\n" +

"            },\n" +

"            {\n" +

"              \"@type\": \"Point\",\n" +

"              \"lat\": 46.948655,\n" +

"              \"lon\": 7.365046\n" +

"            }\n" 

"          ]

最终结果应单独包含坐标，如上述格式所示。

Answer 1

我猜想类似的表达：(?::\[\[)?\[([-+]?\d+\.\d+)\s*,\s*([-+]?\d+\.\d+)\]\s*,?(?:\]\]}})?使用$1and $2as latand进行适当的替换lon，例如：{\n"@type": "point",\n"lat":"$1",\n"lon":"$2"\n},\n可能在某种程度上有效，但不完全有效。演示测试import java.util.regex.Matcher;import java.util.regex.Pattern;public class RegularExpression{    public static void main(String[] args){        final String regex = "(?::\\[\\[)?\\[([-+]?\\d+\\.\\d+)\\s*,\\s*([-+]?\\d+\\.\\d+)\\]\\s*,?(?:\\]\\]\\}})?";        final String string = ":[[[7.365046,46.948655],[7.365046,46.949254],[7.367558,46.949254],[7.367558,46.948655],[7.365046,46.948655]]]}}";        final String subst = "{\"@type\": \"point\",\"lat\":\"$1\",\"lon\":\"$2\"},";        final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE);        final Matcher matcher = pattern.matcher(string);        final String result = matcher.replaceAll(subst);        System.out.println(result);    }}输出{"@type": "点","lat":"7.365046","lon":"46.948655"},{"@type": "点","lat":"7.365046","lon":" 46.949254"},{"@type": "点","lat":"7.367558","lon":"46.949254"},{"@type": "点","lat":"7.367558","经度":"46.948655"},{"@type": "点","纬度":"7.365046","经度":"46.948655"},正则表达式电路jex.im可视化正则表达式：