1.用到的技术、工具：反射+geotools
2.代码实现
package org.jeecg.modules.web.util.geoutils;
import cn.hutool.core.util.ReflectUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONArray;
import cn.hutool.json.JSONObject;
import cn.hutool.json.JSONUtil;
import org.geotools.geometry.jts.WKBReader;
import javax.annotation.Nullable;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Optional;
/**
* java实体类转化geojson工具类
*
* @Author ergui
* @Package：org.jeecg.modules.web.util.geoutils
* @Project：zg-server
* @name：aa
* @Date：2024/1/19 15:02
* @Filename：Entity2GeojsonUtil
**/
public class Entity2GeojsonUtil {
/**
* 实体集合转geojson
*
* @param objects 原实体类
* @param properties 需要在geojson中展示的属性
* @return geojson
* @throws IllegalAccessException
*/
public static String listObject2Geojson(List objects, String geomFildName, String... properties) {
JSONObject result = new JSONObject();
result.putOnce("type", "FeatureCollection");
JSONArray features = new JSONArray();
objects.forEach(object -> {
JSONObject geojson = null;
geojson = object2Feature(object, geomFildName, properties);
features.add(geojson);
});
result.putOnce("features", features);
return result.toString();
}
/**
* 实体转geojson
*
* @param object 原实体类
* @param geomFildName 空间属性字段名、可为空，默认为geom
* @param properties 需要在geojson中展示的属性
* @return geojson
* @throws IllegalAccessException
*/
public static String singleObject2Geojson(Object object, @Nullable String geomFildName, String... properties) {
JSONObject result = new JSONObject();
result.putOnce("type", "FeatureCollection");
JSONArray features = new JSONArray();
JSONObject geojson = object2Feature(object, geomFildName, properties);
features.add(geojson);
result.putOnce("features", features);
return result.toString();
}
/**
* 实体转完整的FeatureJson（）
*
* @param object 原实体类
* @param properties 需要在geojson中展示的属性
* @return geojson
* @throws IllegalAccessException
*/
public static JSONObject object2Feature(Object object, String geomFildName, String... properties) {
JSONObject result = new JSONObject();
result.putOnce("type", "Feature");
result.putOnce("id", "xxx");
// 获取实体中所有属性字段
JSONObject feature = generateFeature(object, geomFildName);
result.putOnce("geometry", feature);
/*属性转properties*/
JSONObject newproperties = generateProperties(object, geomFildName, properties);
result.putOnce("properties", newproperties);
return result;
}
/**
* 生成Feature
*
* @param object
* @param geomFildName 空间属性字段名
* @return
*/
private static JSONObject generateFeature(Object object, String geomFildName) {
Field[] fields = ReflectUtil.getFields(object.getClass());
String geomString = "";
if (fields != null && fields.length > 0) {
Optional<Field> geom = Arrays.stream(fields).filter(f -> f.getName().contains(StrUtil.isEmpty(geomFildName) ?
"geom" : geomFildName)).findFirst();
if (geom.isPresent()) {
Field geomField = geom.get();
//如果是私有属性，需要设置属性的可访问性，不设置的话，会抛出异常。
geomField.setAccessible(true);
try {
geomString = (String) geomField.get(object);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
}
}
}
JSONObject feature = null;
if (StrUtil.isEmpty(geomString)) {
throw new RuntimeException("未解析到有效的空间字段");
}
/*空间属性值为wkt格式*/
if (GeometryDataCoverUtils.isWkt(geomString)) {
feature = GeometryDataCoverUtils.wktToGeoJson(geomString);
return feature;
}
/*空间属性值为GeoJson格式*/
if (GeometryDataCoverUtils.isGeoJson(geomString)) {
feature = JSONUtil.parseObj(geomString);
return feature;
}
/*空间属性值为wkb格式*/
byte[] bytes = WKBReader.hexToBytes(geomString);
if (GeometryDataCoverUtils.isValidWKB(bytes)) {
String geojson = GeometryDataCoverUtils.wkb2Geojson(bytes);
feature = JSONUtil.parseObj(geojson);
}
return feature;
}
/**
* 生成properties
*
* @param object
* @param fields
* @return
* @throws IllegalAccessException
*/
private static JSONObject generateProperties(Object object, String geomFildName, String... fields) {
JSONObject properties = new JSONObject();
Field[] allFields = ReflectUtil.getFields(object.getClass());
try {
if (fields != null && fields.length > 0) {
for (int i = 0; i < fields.length; i++) {
String field1 = fields[i];
Field field = Arrays.stream(allFields).filter(f -> f.getName().equals(field1)).findFirst().get();
field.setAccessible(true);
properties.put(field.getName(), field.get(object));
}
} else {
for (int i = 0; i < allFields.length; i++) {
Field field = allFields[i];
if (!StrUtil.isEmpty(geomFildName)) {
if (!field.getName().contains(geomFildName)) {
field.setAccessible(true);
properties.put(field.getName(), field.get(object));
}
} else if (!field.getName().contains("geom")) {
field.setAccessible(true);
properties.put(field.getName(), field.get(object));
}
}
}
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
}
return properties;
}
public static void main(String[] args) {
Test test = new Test();
test.setAa("aaa");
test.setType("1111");
//test.setGeom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
test.setCc("MULTIPOLYGON(((109.004768468 34.392569801, 109.004742859 34.392565533, 109.00474197 34.392568022, 108.988896666 34.390009251, 108.988898445 34.3900023150001, 108.987369187 34.3897542460001, 108.985841708 34.3894999500001, 108.984316719 34.3892337390001, 108.983874249 34.3891533600001, 108.983511809 34.3890859630001, 108.982633272 34.388918802, 108.982083388 34.3888108580001, 108.981597701 34.3887134080001, 108.980875844 34.388564919, 108.980168213 34.3884148290001, 108.97972272 34.3883182660001, 108.979207335 34.388204988, 108.978935771 34.3881438130001, 108.9787967 34.388113404, 108.978452754 34.388037469, 108.978148823 34.3879693600001, 108.977809324 34.3878928930001, 108.976313143 34.3875327820001, 108.97482123 34.3871614670001, 108.973330561 34.3867839280001, 108.962393022 34.384004276, 108.961628803 34.3838100150001, 108.95849004 34.383012094, 108.955221491 34.3821810810001, 108.955243542 34.3821211480001, 108.955130433 34.382027427, 108.955140036 34.382001641, 108.954830592 34.381926595, 108.954470996 34.381842659, 108.954018034 34.381729201, 108.951347566 34.381064107, 108.951391491 34.380945131, 108.945439814 34.379431466, 108.94411546 34.3790946010001, 108.943346828 34.3788683970001, 108.94316543 34.378798685, 108.942850476 34.378678187, 108.942667279 34.378608098, 108.942089841 34.3783871740001, 108.939200801 34.3772858400001, 108.939200812 34.3772855140001, 108.939225864 34.3765412230001, 108.939225147 34.3765410400001, 108.934156388 34.3752458700001, 108.930165727 34.3742260000001, 108.930165641 34.3742261140001, 108.929654802 34.37489735, 108.929654318 34.374897284, 108.925951259 34.3743967620001, 108.92515115 34.374194919, 108.924487801 34.374025965, 108.917569373 34.3722634580001, 108.917567986 34.3722631040001, 108.917559627 34.372283022, 108.917476045 34.3724610410001, 108.917410602 34.372574505, 108.917375746 34.37263497, 108.917350138 34.372674095, 108.917153095 34.3729339220001, 108.917093519 34.3729999, 108.917095299 34.3730003530001, 108.925114707 34.3750423290001, 108.925115581 34.375042552, 108.925455809 34.375129546, 108.92566068 34.3751819290001, 108.929029183 34.3764767550001, 108.929028307 34.377285531, 108.929028307 34.3772859270001, 108.938089333 34.3796002620001, 108.938606251 34.3789883760001, 108.938606306 34.3789883100001, 108.939055538 34.379050394, 108.941847817 34.3794362560001, 108.941991853 34.3794378860001, 108.942413351 34.3794426530001, 108.942989736 34.379560199, 108.943876453 34.37974123, 108.951152128 34.38159176, 108.951198008 34.381468162, 108.952123496 34.381703256, 108.952500876 34.3818035530001, 108.952841975 34.381879133, 108.953125455 34.38196965, 108.953861008 34.3821547750001, 108.954284983 34.382272678, 108.95466343 34.3823775990001, 108.954963204 34.3824512910001, 108.954973052 34.382453712, 108.954980521 34.382433083, 108.95513702 34.382408717, 108.955147285 34.3823809780001, 108.955163872 34.3823361570001, 108.955166191 34.3823367460001, 108.961777001 34.3840173460001, 108.962547877 34.38421329, 108.965100857 34.384862174, 108.965101217 34.38486134, 108.965582508 34.3849836690001, 108.965582281 34.384984531, 108.965778758 34.385034465, 108.965779009 34.3850336030001, 108.966523111 34.3852227190001, 108.966522818 34.3852235630001, 108.970929726 34.3863434450001, 108.973273655 34.386939006, 108.974764146 34.387317078, 108.976257658 34.387688392, 108.977755796 34.388048858, 108.978214804 34.3881639160001, 108.978435862 34.388218867, 108.978743705 34.388294267, 108.978877264 34.3883268110001, 108.979167679 34.3883924310001, 108.979751355 34.3885204700001, 108.980609262 34.388704348, 108.981131761 34.3888130020001, 108.981676311 34.388923791, 108.982216238 34.389031378, 108.982916754 34.3891672410001, 108.983515368 34.3892808750001, 108.983914267 34.3893543190001, 108.984269772 34.389418693, 108.98579565 34.389685259, 108.987324907 34.3899399100001, 108.988854877 34.390188159, 108.988859323 34.3901687750001, 109.004704982 34.3927275460001, 109.004701425 34.392742662, 109.004769895 34.392753687, 109.006664437 34.393059195, 109.006619443 34.3929606720001, 109.006580849 34.3928635710001, 109.004768468 34.392569801)))");
String geojson = singleObject2Geojson(test, "cc");
List<Test> aaa = new ArrayList<>();
aaa.add(test);
String geojson1 = listObject2Geojson(aaa, "cc");
System.out.println(geojson);
System.out.println(geojson1);
}
}
标签：实体类,java,String,JSONObject,object,geojson,geomFildName,properties From： https://www.cnblogs.com/z-double/p/17979356