GIS的学习（二十六）geotools 使用 部分代码总结
前段时间的一个项目 本来用ae完成了种种的 查询，空间分析等等功能的代码，但是不幸的是 这是一个web项目，无奈 ae各种错误，显然ae放在server端是不好使的 无奈 一咬牙一跺脚 全部换 换成geotools 看文档 看api 从零 开始算是把 原来AE实现的东西 统统改了过来 用起来 反而觉得既稳定 效率还不错哈！
以下是部分功能总结：
1、连接数据库 这里使用的postgis 链接代码如下：
private static void conn(String dbtype, String host, String port,
String database, String userName, String password) {
Map<String, Object> params = new HashMap<String, Object>();
// params.put(PostgisNGDataStoreFactory.DBTYPE.key, "postgis"); // 两种代码方式
// params.put(PostgisNGDataStoreFactory.HOST.key, "localhost");
// params.put(PostgisNGDataStoreFactory.PORT.key, new Integer(5432));
// params.put(PostgisNGDataStoreFactory.DATABASE.key, "postgis");
// params.put(PostgisNGDataStoreFactory.SCHEMA.key, "public");
// params.put(PostgisNGDataStoreFactory.USER.key, "postgres");
// params.put(PostgisNGDataStoreFactory.PASSWD.key, "root");
params.put(PostgisNGDataStoreFactory.DBTYPE.key, dbtype);
params.put(PostgisNGDataStoreFactory.HOST.key, host);
params.put(PostgisNGDataStoreFactory.PORT.key, new Integer(port));
params.put(PostgisNGDataStoreFactory.DATABASE.key, database);
params.put(PostgisNGDataStoreFactory.SCHEMA.key, "public");
params.put(PostgisNGDataStoreFactory.USER.key, userName);
params.put(PostgisNGDataStoreFactory.PASSWD.key, password);
try {
pgDatastore = DataStoreFinder.getDataStore(params);
if (pgDatastore != null) {
System.out.println("系统连接到位于：" + host + "的空间数据库" + database
+ "成功！");
} else {
System.out.println("系统连接到位于：" + host + "的空间数据库" + database
+ "失败！请检查相关参数");
}
} catch (IOException e) {
e.printStackTrace();
System.out.println("系统连接到位于：" + host + "的空间数据库" + database
+ "失败！请检查相关参数");
}
}
调用方法为：conn("postgis", "localhost", 5432, "postgis", "postgres", "root");
2、图层的操作
2.1 查询
public static ArrayList<SimpleFeature> queryMethod(String filterStr,
String layerName) {
//pgDatastore为上文连接数据库获取相当于AE中的workspace
//SimpleFeatureSource相当于AE中的featureClass
SimpleFeatureSource featureSource =pgDatastore.getFeatureSource(layerName);
ArrayList<SimpleFeature> featureList = new ArrayList<SimpleFeature>();
if(featureSource==null)
return featureList;
try {
Filter filter;
filter = CQL.toFilter(filterStr); // filterStr形式 如 name='武汉大学' or code like 'tt123%'
SimpleFeatureCollection result = featureSource.getFeatures(filter);
FeatureIterator<SimpleFeature> itertor = result.features();
while (itertor.hasNext()) {
SimpleFeature feature = itertor.next();
featureList.add(feature);
}
itertor.close();
return featureList;
} catch (CQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
2.2 要素操作 对上面4.1中的 SimpleFeature操作
//获取feature的geometry
Geometry geo=(Geometry) feature.getDefaultGeometry();
//获取geometry中的坐标 这里用string的方式保存
int geoUnm = geo.getNumGeometries(); // 一个geometry可能含有n个geometry
for (int i = 0; i < geoUnm; i++) {
Geometry singleGeo = geo.getGeometryN(i); //获取其中每一个geometry
int pointCount = singleGeo.getNumPoints();
Coordinate[] coords = singleGeo.getCoordinates();
for (int j = 0; j < pointCount; j++) {
if (j == pointCount - 1)
sBuilder.append(coords[j].x + "," + coords[j].y);
else {
sBuilder.append(coords[j].x + "," + coords[j].y
+ ";");
}
}
if (i != geoUnm - 1) {
sBuilder.append("|");
}
}
//获取feature中的属性
feature.getAttribute(arg0);
2.3 拓扑查询
public static Filter getGeoFilter(FilterFactory2 ff, //构建拓扑查询的filter
String geometryAttributeName, Geometry refGeo,
SpatialReltionType.TopoRelTypeEnum relType) { //这个SpatialReltionType是我自己定义的。。。
switch (relType) {
case intersect:
return ff.intersects(ff.property(geometryAttributeName), ff
.literal(refGeo));
case contains:
return ff.contains(ff.property(geometryAttributeName), ff
.literal(refGeo));
case within:
return ff.within(ff.property(geometryAttributeName), ff
.literal(refGeo));
case cross:
return ff.crosses(ff.property(geometryAttributeName), ff
.literal(refGeo));
case overlaps:
return ff.overlaps(ff.property(geometryAttributeName), ff
.literal(refGeo));
case touches:
return ff.touches(ff.property(geometryAttributeName), ff
.literal(refGeo));
case equals:
return ff.equals(ff.property(geometryAttributeName), ff
.literal(refGeo));
case disjoint:
return ff.disjoint(ff.property(geometryAttributeName), ff
.literal(refGeo));
default:
return null;
}
}
// 普通的拓扑查询
public static ArrayList<Geometry> topoQueryMethod(Geometry refGeo,
String layerName, SpatialReltionType.TopoRelTypeEnum relType) {
ArrayList<SimpleFeature> featurelist=new ArrayList<SimpleFeature>();
FilterFactory2 ff = CommonFactoryFinder.getFilterFactory2(null);
SimpleFeatureSource featureSource=pgDatastore.getFeatureSource(layerName);
SimpleFeatureType schema = featureSource.getSchema();
String geometryAttributeName = schema.getGeometryDescriptor().getLocalName();
Filter filter1= getGeoFilter(ff,geometryAttributeName, refGeo, relType); //上面的方法
SimpleFeatureCollection result=null;
try {
result = featureSource.getFeatures(filter1);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if(result==null)
return null;
FeatureIterator<SimpleFeature> itertor = result.features();
while (itertor.hasNext()) {
SimpleFeature feature = itertor.next();
featurelist.add(feature);
}
//这个方法是将feature转为geometry 自己定义的
return SpatialUtil.ConverToGeoList(featurelist);
}
//联合属性的拓扑查询
public static ArrayList<Geometry> topoQueryMethod(Geometry refGeo,
String queryName, String layerName,
SpatialReltionType.TopoRelTypeEnum relType) {
FilterFactory2 ff = CommonFactoryFinder.getFilterFactory2(null);
ArrayList<SimpleFeature> featurelist=new ArrayList<SimpleFeature>();
SimpleFeatureSource featureSource=pgDatastore.getFeatureSource(layerName);
SimpleFeatureType schema = featureSource.getSchema();
String geometryAttributeName = schema.getGeometryDescriptor().getLocalName();
Filter filter1= SpatialUtil.getGeoFilter(ff,geometryAttributeName, refGeo, relType);
Filter filter2=null;
try {
filter2=CQL.toFilter("StandName = '"+queryName+"'");
} catch (CQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
List<Filter> match = new ArrayList<Filter>();
match.add(filter1);
match.add(filter2);
Filter filter = ff.and(match);
SimpleFeatureCollection result=null;
try {
result = featureSource.getFeatures(filter);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if(result==null)
return null;
FeatureIterator<SimpleFeature> itertor = result.features();
while (itertor.hasNext()) {
SimpleFeature feature = itertor.next();
featurelist.add(feature);
}
return SpatialUtil.ConverToGeoList(featurelist);
}
3,编辑图层
3.1 添加要素
//添加一个feature到图层中 在添加前要确定构造featureType
public static SimpleFeatureType createFeatureType(String typeName,Class type) {
SimpleFeatureTypeBuilder builder = new SimpleFeatureTypeBuilder();
builder.setName(typeName);
builder.setCRS(DefaultGeographicCRS.WGS84); // <- Coordinate reference
// system
builder.add("the_geom", type); //这个为地理属性字段 postgis中为 the——geom
builder.add("StandName", String.class); // 这是其他属性字段 自己定义的....
// build the type
final SimpleFeatureType TYPE = builder.buildFeatureType();
return TYPE;
}
//添加到图层的图层名，添加的要素空间属性和要素的某属性名
public static boolean addFeature(String layerName,Geometry geo,String featureName){
String type=geo.getGeometryType();
Class TypeClass=null;
if(type.toLowerCase().equals("point")){
TypeClass=Point.class;
}else if(type.toLowerCase().equals("polygon")){
TypeClass=Polygon.class;
}else if(type.toLowerCase().equals("polyline")){
TypeClass=Polyline.class;
}else if(type.toLowerCase().equals("multipolygon")){
TypeClass=MultiPolygon.class;
}
SimpleFeatureType featureType=createFeatureType(layerName,TypeClass);
SimpleFeatureCollection collection = FeatureCollections.newCollection();
SimpleFeatureBuilder featureBuilder = new SimpleFeatureBuilder(featureType);
/* Longitude (= x coord) first ! */
GeometryFactory geometryFactory = JTSFactoryFinder.getGeometryFactory(null);
featureBuilder.add(geo);
featureBuilder.add(featureName);
SimpleFeature feature = featureBuilder.buildFeature(null);
collection.add(feature);
FeatureSource featureSource=pgDatastore.getFeatureSource(layerName);
if (featureSource instanceof SimpleFeatureStore) {
SimpleFeatureStore featureStore = (SimpleFeatureStore) featureSource;
Transaction transaction = new DefaultTransaction("create");
featureStore.setTransaction(transaction);
try {
featureStore.addFeatures(collection);
transaction.commit();
return true;
} catch (Exception problem) {
problem.printStackTrace();
try {
transaction.rollback();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} finally {
try {
transaction.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
} else {
System.out.println(layerName + " does not support read/write access");
}
return false;
}
3.2 修改要素
// 修改feacode为XX的要素的名字为featureName 地理方位为geo (feacode StandName为你的属性字段自定义)
public static boolean modifyFeature(String layerName,Geometry geo,String featureName,String FeaCode){
FeatureSource featureSource=pgDatastore.getFeatureSource(layerName);
if (featureSource instanceof SimpleFeatureStore) {
SimpleFeatureStore featureStore = (SimpleFeatureStore) featureSource;
Transaction transaction = new DefaultTransaction("create");
featureStore.setTransaction(transaction);
try {
String filterStr="FeaCode= '"+FeaCode+"'";
String[] names=new String[2];
names[0]="StandName";
names[1]="the_geom";
Object[] values=new Object[2];
values[0]=featureName;
values[1]=geo;
featureStore.modifyFeatures(names, values, CQL.toFilter(filterStr));
transaction.commit();
return true;
} catch (Exception problem) {
problem.printStackTrace();
try {
transaction.rollback();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} finally {
try {
transaction.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
} else {
System.out.println(layerName + " does not support read/write access");
}
return false;
}
4 、Geometry 与 JTS
geotools 构建 geometry方法：这里转载一个别人写的比较好的
4.1构建点
public Point createPoint(){
Coordinate coord = new Coordinate(109.013388, 32.715519);
Point point = geometryFactory.createPoint( coord );
return point;
}
public Point createPointByWKT() throws ParseException{
WKTReader reader = new WKTReader( geometryFactory );
Point point = (Point) reader.read("POINT (109.013388 32.715519)");
return point;
}
public MultiPoint createMulPointByWKT()throws ParseException{
WKTReader reader = new WKTReader( geometryFactory );
MultiPoint mpoint = (MultiPoint) reader.read("MULTIPOINT(109.013388 32.715519,119.32488 31.435678)");
return mpoint;
}
4.2 构建线
public LineString createLine(){
Coordinate[] coords = new Coordinate[] {new Coordinate(2, 2), new Coordinate(2, 2)};
LineString line = geometryFactory.createLineString(coords);
return line;
}
public LineString createLineByWKT() throws ParseException{
WKTReader reader = new WKTReader( geometryFactory );
LineString line = (LineString) reader.read("LINESTRING(0 0, 2 0)");
return line;
}
public MultiLineString createMLine(){
Coordinate[] coords1 = new Coordinate[] {new Coordinate(2, 2), new Coordinate(2, 2)};
LineString line1 = geometryFactory.createLineString(coords1);
Coordinate[] coords2 = new Coordinate[] {new Coordinate(2, 2), new Coordinate(2, 2)};
LineString line2 = geometryFactory.createLineString(coords2);
LineString[] lineStrings = new LineString[2];
lineStrings[0]= line1;
lineStrings[1] = line2;
MultiLineString ms = geometryFactory.createMultiLineString(lineStrings);
return ms;
}
public MultiLineString createMLineByWKT()throws ParseException{
WKTReader reader = new WKTReader( geometryFactory );
MultiLineString line = (MultiLineString) reader.read("MULTILINESTRING((0 0, 2 0),(1 1,2 2))");
return line;
}
4.3 构建多边形
public Polygon createPolygonByWKT() throws ParseException{
WKTReader reader = new WKTReader( geometryFactory );
Polygon polygon = (Polygon) reader.read("POLYGON((20 10, 30 0, 40 10, 30 20, 20 10))");
return polygon;
}
public MultiPolygon createMulPolygonByWKT() throws ParseException{
WKTReader reader = new WKTReader( geometryFactory );
MultiPolygon mpolygon = (MultiPolygon) reader.read("MULTIPOLYGON(((40 10, 30 0, 40 10, 30 20, 40 10),(30 10, 30 0, 40 10, 30 20, 30 10)))");
return mpolygon;
}
4.4 构建geo集合
public GeometryCollection createGeoCollect() throws ParseException{
LineString line = createLine();
Polygon poly = createPolygonByWKT();
Geometry g1 = geometryFactory.createGeometry(line);
Geometry g2 = geometryFactory.createGeometry(poly);
Geometry[] garray = new Geometry[]{g1,g2};
GeometryCollection gc = geometryFactory.createGeometryCollection(garray);
return gc;
}
4.5 构建圆
public Polygon createCircle(double x, double y, final double RADIUS){
final int SIDES = 32;//圆上面的点个数
Coordinate coords[] = new Coordinate[SIDES+1];
for( int i = 0; i < SIDES; i++){
double angle = ((double) i / (double) SIDES) * Math.PI * 2.0;
double dx = Math.cos( angle ) * RADIUS;
double dy = Math.sin( angle ) * RADIUS;
coords[i] = new Coordinate( (double) x + dx, (double) y + dy );
}
coords[SIDES] = coords[0];
LinearRing ring = geometryFactory.createLinearRing( coords );
Polygon polygon = geometryFactory.createPolygon( ring, null );
return polygon;
}
postgis 删除表 SELECT DropGeometryTable ('my_schema','my_spatial_table');
如： SELECT DropGeometryTable ('public','river');