7 changed files with 253 additions and 26 deletions
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package org.dromara.system.utils; |
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import cn.hutool.core.util.ObjectUtil; |
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import java.io.*; |
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import java.util.*; |
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/** |
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* KML文件解析器 |
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* KML是Google Earth使用的标记语言格式 |
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*/ |
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public class KmlParserUtil { |
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/** |
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* 从KML内容中提取所有Placemark数据 |
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* |
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* @param kmlContent KML内容 |
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* @return 包含name和coordinates的Map列表 |
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*/ |
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public static List<Map<String, String>> extractPlacemarks(String kmlContent) { |
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List<Map<String, String>> placemarkList = new ArrayList<>(); |
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int startIndex = 0; |
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while (true) { |
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// 查找Placemark开始标签
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int startPlacemark = kmlContent.indexOf("<Placemark>", startIndex); |
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if (startPlacemark == -1) { |
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break; |
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} |
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// 查找Placemark结束标签
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int endPlacemark = kmlContent.indexOf("</Placemark>", startPlacemark); |
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if (endPlacemark == -1) { |
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break; |
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} |
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// 提取当前Placemark的内容
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String placemarkContent = kmlContent.substring(startPlacemark, endPlacemark + "</Placemark>".length()); |
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// 提取name
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String name = ""; |
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int nameStart = placemarkContent.indexOf("<name>"); |
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int nameEnd = placemarkContent.indexOf("</name>"); |
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if (nameStart != -1 && nameEnd != -1) { |
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name = placemarkContent.substring(nameStart + "<name>".length(), nameEnd).trim(); |
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} |
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// 提取coordinates
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String coordinates = ""; |
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int coordStart = placemarkContent.indexOf("<coordinates>"); |
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int coordEnd = placemarkContent.indexOf("</coordinates>"); |
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if (coordStart != -1 && coordEnd != -1) { |
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coordinates = placemarkContent.substring(coordStart + "<coordinates>".length(), coordEnd).trim(); |
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} |
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//提取<Data name ="name">
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if (ObjectUtil.isEmpty(name)){ |
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int dataStart = placemarkContent.indexOf("Data name =\"name\""); |
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if (dataStart != -1) { |
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int valueStart = placemarkContent.indexOf("<value>", dataStart); |
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int valueEnd = placemarkContent.indexOf("</value>", valueStart); |
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if (valueStart != -1 && valueEnd != -1) { |
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name = placemarkContent.substring(valueStart + "<value>".length(), valueEnd).trim(); |
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} |
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} |
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} |
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// 创建Map并添加到列表
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Map<String, String> placemarkMap = new HashMap<>(); |
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placemarkMap.put("XZQMC", name); |
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String wkt = convertToWKT(coordinates); |
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placemarkMap.put("the_geom", wkt); |
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placemarkList.add(placemarkMap); |
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// 更新搜索起始位置
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startIndex = endPlacemark + "</Placemark>".length(); |
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} |
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return placemarkList; |
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} |
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/** |
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* 将坐标字符串转换为WKT（Well-Known Text）格式 |
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* |
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* @param coordinates 坐标字符串 |
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* @return WKT格式的字符串 |
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*/ |
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public static String convertToWKT(String coordinates) { |
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if (coordinates == null || coordinates.trim().isEmpty()) { |
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return ""; |
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} |
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// 构建WKT格式的多边形
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StringBuilder wkt = new StringBuilder("POLYGON(("); |
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String[] coordPairs = coordinates.trim().split("\\s+"); |
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// 处理每个坐标对
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for (int i = 0; i < coordPairs.length; i++) { |
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String[] coords = coordPairs[i].split(","); |
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if (coords.length >= 2) { |
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wkt.append(coords[0]).append(" ").append(coords[1]); |
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if (i < coordPairs.length - 1) { |
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wkt.append(", "); |
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} |
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} |
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} |
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wkt.append("))"); |
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StringBuffer polygonSb = new StringBuffer("GEOMETRYCOLLECTION("); |
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polygonSb.append(wkt); |
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polygonSb.append(")"); |
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return polygonSb.toString(); |
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} |
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/** |
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* 解析KML文件的主方法 |
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* |
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* @param inputStream KML文件的输入流 |
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* @return 包含name和coordinates的Map列表 |
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* @throws IOException 如果文件读取或处理过程中发生错误 |
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*/ |
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public static List<Map<String, String>> parseKml(InputStream inputStream) throws IOException { |
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try (BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream))) { |
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StringBuilder kmlContent = new StringBuilder(); |
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String line; |
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while ((line = reader.readLine()) != null) { |
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kmlContent.append(line).append("\n"); |
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} |
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return extractPlacemarks(kmlContent.toString()); |
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} |
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} |
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} |
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