Geotools处理shape文件

shape文件结构

• filename.shp: shapes
  
• filename.shx: 索引文件
  
• filename.dbf: 结构化数据文件
  
• filename.qix: 空间索引文件
  
• filename.fix: fid索引文件
  
• filename.sld: 样式文件
  

依赖

1. <dependency>
2.     <groupId>org.geotools</groupId>
3.     <artifactId>gt-main</artifactId>
4.     <version>27.2</version>
5. </dependency>
6. <dependency>
7.     <groupId>org.geotools</groupId>
8.     <artifactId>gt-shapefile</artifactId>
9.     <version>27.2</version>
10. </dependency>

复制代码

创建连接

连接参数

ParameterrequiredDescriptionurltrue.shp文件的urlnamespacefalseFeatureType的URIcreate spatial indexfalse是否创建空间索引，默认truecharsetfalse解码DBF文件的编码,默认ISO_8859_1timezonefalse解析DBF文件时间的时区memory mapped bufferfalse内存映射，默认falsecache and reuse memory mapsfalse使用内存映射时，缓存并重用，默认trueenable spatial indexfalse是否使用空间索引，默认true代码示例

1. /**
2. *
3. * 创建shape文件
4. *
5. * */
7. FileDataStoreFactorySpi factory = new ShapefileDataStoreFactory();
9. //新建文件
10. File file = new File("my.shp");
11. //datastore
12. Map<String, Object> params = new HashMap<>();
13. params.put("url", file.toURI().toURL());
14. params.put("create spatial index", Boolean.TRUE);
15. DataStore dataStore = factory.createNewDataStore(params);
18. //Feature数据定义
19. SimpleFeatureTypeBuilder typeBuilder = new SimpleFeatureTypeBuilder();
20. //图层名
21. typeBuilder.setName("myLayer");
22. //空间坐标
23. typeBuilder.setCRS(CRS.decode("EPSG:4490"));
24. typeBuilder.add("the_geom", Point.class);
25. //普通属性字段
26. typeBuilder.add("id", String.class);
27. typeBuilder.length(10).add("name", String.class);//字段长度
28. typeBuilder.add("number",Integer.class);
29. typeBuilder.add("double",Double.class);
30. typeBuilder.add("time",Date.class);
31. SimpleFeatureType featureType = typeBuilder.buildFeatureType();
32. //创建feature定义到shape
33. dataStore.createSchema(featureType);
35. /**
36. * 写数据到shape文件
37. *
38. * */
41. //shape中feature定义
42. Map<String, Object> params = new HashMap<>();
43. params.put("url", file.toURI().toURL());
44. DataStore dataStore2 = DataStoreFinder.getDataStore(params)；
45. String typeName = dataStore2.getTypeNames()[0];
46. SimpleFeatureSource featureSource = dataStore2.getFeatureSource(typeName);
47. SimpleFeatureType schema = featureSource.getSchema();
49. //事务处理
50. Transaction transaction = new DefaultTransaction("create");
52. if (featureSource instanceof SimpleFeatureStore) {
53.     SimpleFeatureStore featureStore = (SimpleFeatureStore) featureSource;
55.     //创建一条数据 feature
56.     List<SimpleFeature> features = new ArrayList<>();
57.     GeometryFactory geometryFactory = JTSFactoryFinder.getGeometryFactory();
58.     SimpleFeatureBuilder featureBuilder = new SimpleFeatureBuilder(schema);
59.     Point point = geometryFactory.createPoint(new Coordinate(106.69563874,29.563694210810283));
60.     featureBuilder.set("the_geom",point);
61.     featureBuilder.set("id","id1");
62.     featureBuilder.set("name","name1");
63.     featureBuilder.set("number1",100);
64.     featureBuilder.set("number2",66.0);
65.     featureBuilder.set("time",new Date());
66.     SimpleFeature feature = featureBuilder.buildFeature(null);
67.     features.add(feature);
69.     SimpleFeatureCollection collection = new ListFeatureCollection(schema, features);
70.     featureStore.setTransaction(transaction);
71.     try {
72.         //写入shape中
73.         featureStore.addFeatures(collection);
74.         transaction.commit();
75.     } catch (Exception e) {
76.         e.printStackTrace();
77.         transaction.rollback();
78.     } finally {
79.         transaction.close();
80.     }
81. } else {
82.     System.out.println("写入失败");
83. }
86. /**
87. * 读取shape文件数据
88. *
89. * */
90. DataStore dataStore3 = new ShapefileDataStore(file.toURI().toURL());
92. String typeName = dataStore3.getTypeNames()[0];
93. FeatureSource<SimpleFeatureType, SimpleFeature> source =dataStore3.getFeatureSource(typeName);
94. Filter filter = Filter.INCLUDE;
96. FeatureCollection<SimpleFeatureType, SimpleFeature> collection = source.getFeatures(filter);
97. try (FeatureIterator<SimpleFeature> features = collection.features()) {
98.     //features必须关闭，否则会造成内存泄漏
99.     while (features.hasNext()) {
100.         SimpleFeature feature = features.next();
101.         feature.getProperties().stream().peek(e-> System.out.println(e.getName().getLocalPart() + " = " + e.getValue()));
102.     }
103. }

复制代码

免责声明：如果侵犯了您的权益，请联系站长，我们会及时删除侵权内容，谢谢合作！