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60 lines
1.4 KiB
60 lines
1.4 KiB
4 months ago
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GeoJson POJOs for Jackson
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=========================
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A small package of all GeoJson POJOs (Plain Old Java Objects) for serializing and
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deserializing of objects via JSON Jackson Parser.
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Usage
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-----
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If you know what kind of object you expect from a GeoJson file you can directly read it like this:
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```java
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FeatureCollection featureCollection =
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new ObjectMapper().readValue(inputStream, FeatureCollection.class);
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```
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If you want to read any GeoJson file read the value as GeoJsonObject and then test for the contents via instanceOf:
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```java
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GeoJsonObject object = new ObjectMapper().readValue(inputStream, GeoJsonObject.class);
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if (object instanceof Polygon) {
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...
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} else if (object instanceof Feature) {
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...
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}
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```
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and so on.
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Or you can use the GeoJsonObjectVisitor to visit the right method:
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```java
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GeoJsonObject object = new ObjectMapper().readValue(inputStream, GeoJsonObject.class);
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object.accept(visitor);
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```
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Writing Json is even easier. You just have to create the GeoJson objects and pass them to the Jackson ObjectMapper.
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```java
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FeatureCollection featureCollection = new FeatureCollection();
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featureCollection.add(new Feature());
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String json= new ObjectMapper().writeValueAsString(featureCollection);
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```
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Maven Central
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-------------
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You can find the library in the Maven Central Repository.
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```xml
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<dependency>
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<groupId>de.grundid.opendatalab</groupId>
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<artifactId>geojson-jackson</artifactId>
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<version>1.8.1</version>
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</dependency>
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```
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