通过Geotools实现对Feature的增删改查

postgis依赖

<dependency>
    <groupId>org.geotools</groupId>
    <artifactId>gt-main</artifactId>
    <version>27.2</version>
</dependency>
<dependency>
    <groupId>org.geotools</groupId>
    <artifactId>gt-jdbc-postgis</artifactId>
    <version>27.2</version>
</dependency>

JDBCDataStore连接参数

连接池参数

创建连接JDBCDataStore

Map<String, String> params = Map.of(
    PostgisNGDataStoreFactory.HOST.key, host,
    PostgisNGDataStoreFactory.PORT.key, port,
    PostgisNGDataStoreFactory.DATABASE.key, database,
    PostgisNGDataStoreFactory.SCHEMA.key, schema,
    PostgisNGDataStoreFactory.USER.key, user,
    PostgisNGDataStoreFactory.PASSWD.key, passwd,
    PostgisNGDataStoreFactory.DBTYPE.key, dbtype
);
JDBCDataStore jdbcDataStore = (JDBCDataStore)DataStoreFinder.getDataStore(params);

WFS

<dependency>
   <groupId>org.geotools</groupId>
   <artifactId>gt-wfs-ng</artifactId>
   <version>${geotools.version}</version>
 </dependency>

WFSDataStore连接参数

创建WFSDataStore示例

// 1.0.0版本使用GML-2，可以正确读出Feature中name字段，其他版本不可以
String getCapabilities = "http://localhost:8080/geoserver/wfs?REQUEST=GetCapabilities&version=1.0.0";

Map<String,String> connectionParameters = new HashMap<>();
connectionParameters.put("WFSDataStoreFactory:GET_CAPABILITIES_URL", getCapabilities );

DataStore data = DataStoreFinder.getDataStore(connectionParameters);

过滤器-Filter

使用过滤器来定义要对其进行操作的Feature集合。过滤器也可以组合成一个操作集合使用。
简单说，过滤器相当于SQL语句的WHERE子句中存在的信息。
Filter有多个子类，实现了许多类型的过滤器，包括简单的属性比较和空间查询。

// 普通字段
FilterFactory ff = CommonFactoryFinder.getFilterFactory();

/**
 * field 字段名
 * value 条件值
 * geometry 条件几何体
 * 
 * 
 * matchCase 是否区分大小写，默认true-区分
 * MatchAction(实现MultiValuedFilter的会有)，匹配逻辑
 * MatchAction.ANY-任何一个满足，默认值
 * MatchAction.ALL-全部满足
 * MatchAction.ONE-只有一个满足
 * */

PropertyIsEqualTo equal = ff.equal(ff.property(field), ff.literal(value), true);//等于
PropertyIsLike like = ff.like(ff.property(field), "%keywords%");//模糊匹配
PropertyIsNotEqualTo notEqualTo = ff.notEqual(ff.property(field), ff.literal(value));//不等于
PropertyIsNull aNull = ff.isNull(ff.property(field));//null
PropertyIsGreaterThan greater = ff.greater(ff.property(field), ff.literal(value));// 大于
PropertyIsGreaterThanOrEqualTo greaterOrEqual = ff.greaterOrEqual(ff.property(field), ff.literal(value));// 大于等于
PropertyIsLessThan less = ff.less(ff.property(field), ff.literal(value));//小于
PropertyIsLessThanOrEqualTo lessOrEqual = ff.lessOrEqual(ff.property(field), ff.literal(value));//小于等于
PropertyIsBetween between = ff.between(ff.property(field), ff.literal(value), ff.literal(value));//在...之间
During during = ff.during(ff.property(field), ff.literal(value));//在时间期间
Before before = ff.before(ff.property(field), ff.literal(value));//在时间之前
After after = ff.after(ff.property(field), ff.literal(value));//在时间之后


// Geometry字段
FilterFactory2 ff2 = CommonFactoryFinder.getFilterFactory2();

Beyond beyond = ff2.beyond(ff2.property(featureSource.schema.geometryDescriptor.localName), ff2.literal(geometry), 100.0, Units.METRE.name);// 图层几何字段超出给定几何100米距离的
Contains contains = ff2.contains(ff2.property(featureSource.schema.geometryDescriptor.localName), ff2.literal(geometry));// 图层几何字段包含给定几何
Within within = ff2.within(ff2.property(featureSource.schema.geometryDescriptor.localName), ff2.literal(geometry));// 图层几何字段被给定几何包含
Intersects intersects = ff2.intersects(ff2.property(featureSource.schema.geometryDescriptor.localName), ff2.literal(geometry));// 图层几何字段与给定几何相交
Disjoint disjoint = ff2.disjoint(ff2.property(featureSource.schema.geometryDescriptor.localName), ff2.literal(geometry));// 图层几何字段与给定几何不相交
Touches touches = ff2.touches(ff2.property(featureSource.schema.geometryDescriptor.localName), ff2.literal(geometry));// 图层几何字段与给定几何相切


// filter集合的逻辑关系，and并，or或，not非
And and = ff.and(List.of(equal,like,beyond));//
Or or = ff.or(List.of(notEqualTo,greater,contains));
Not not = ff.not(during);

// Function的实现类具体实现函数，name-函数名，例如：min,strReplace,toWKT
Function function = ff.function(name,expr1,exprN);

PropertyName property = ff.property(field);
Literal v = ff.literal(value);
Function min = ff.function("min", property, v);


PropertyName property = ff.property(field);
Literal search = ff.literal("search");
Literal replace = ff.literal("replace");
Literal all = ff.literal( true );
Function replace = ff.function("strReplace", new Expression[]{property,search,replace,all});

PropertyName property = ff.property(featureSource.schema.geometryDescriptor.localName);
Function toWKT = ff.function("toWKT", property);

查询

/**
 * tableName 表名
 * filter 过滤器
 * List<String> propNames 字段名列表
 * 
 * startIndex 起始位
 * maxFeatures 最大条数
 * sortField 排序字段名
 * */
ContentFeatureSource featureSource = (ContentFeatureSource) jdbcDataStore.getFeatureSource(tableName);

//返回字段列
List<PropertyName> propertyNames = propNames.stream().map(ff::property).collect(Collectors.toList());
Query query = new Query(tableName,filter,propertyNames)；
int count = featureSource.getCount(query)；//计数
// 分页，倒序
query.setStartIndex(startIndex);
query.setMaxFeatures(maxFeatures);
query.setSortBy(new SortByImpl(ff.property(sortField), SortOrder.DESCENDING));

ContentFeatureCollection collection = featureSource.getFeatures(query);
SimpleFeatureIterator iterator = collection.features();
// SimpleFeatureIterator必须关闭，否则会造成内存泄漏
iterator.close();

新增

/**
* tableName 图层名
* fieldName1 字段名
* fieldValue1 字段值
**/

ContentFeatureSource featureSource = (ContentFeatureSource) jdbcDataStore.getFeatureSource(tableName);
SimpleFeatureStore store = (SimpleFeatureStore)featureSource;  // write access!
SimpleFeatureBuilder featureBuilder = new SimpleFeatureBuilder(store.getSchema());
featureBuilder.set(fieldName1,fieldValue1);
featureBuilder.set(fieldNameN,fieldValueN);
SimpleFeature feature = featureBuilder.buildFeature(null);
ListFeatureCollection featureCollection = new ListFeatureCollection(store.getSchema(), List.of(feature));
List<FeatureId> addFeatures = store.addFeatures(featureCollection);

删除

/**
*
* typeName 图层名
* fliter 过滤条件
*
*/
ContentFeatureSource featureSource = (ContentFeatureSource) jdbcDataStore.getFeatureSource(tableName);
SimpleFeatureStore store = (SimpleFeatureStore)featureSource;  // write access!
store.removeFeatures(filter);

修改

/**
* 
* typeName 图层名
* names 修改字段名数组
* values 修改值数组
* fliter 过滤条件
* names和values顺序保持一致
*/
ContentFeatureSource featureSource = (ContentFeatureSource) jdbcDataStore.getFeatureSource(tableName);
SimpleFeatureStore store = (SimpleFeatureStore)featureSource;  // write access!
store.modifyFeature(names, values, filter)