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How can we create a JSON using JsonGenerator in Java?
The JsonGenerator is a base class that defines public API for writing JSON content. The instances are created using factory methods of a JsonFactory instance. Once we can get the JsonGenerator from factory instance then use the writeStartObject() for writing starting marker of a JSON Object value, writeFieldName() method for writing a field name, writeString() method for outputting a String value, writeStartArray() method for writing starting marker of a Array value and writeEndObject() method for writing closing marker of a JSON Object value.
Syntax
public abstract class JsonGenerator extends Object implements Closeable, Flushable, Versioned
Example
import java.io.*;
import com.fasterxml.jackson.core.*;
public class JsonGeneratorTest {
public static void main(String args[]) throws IOException {
JsonFactory factory = new JsonFactory();
StringWriter jsonObjectWriter = new StringWriter();
JsonGenerator generator = factory.createGenerator(jsonObjectWriter);
generator.useDefaultPrettyPrinter(); // pretty print JSON
generator.writeStartObject();
generator.writeFieldName("empid");
generator.writeString("120");
generator.writeFieldName("firstName");
generator.writeString("Ravi");
generator.writeFieldName("lastName");
generator.writeString("Chandra");
generator.writeFieldName("technologies");
generator.writeStartArray();
generator.writeString("SAP");
generator.writeString("Java");
generator.writeString("Selenium");
generator.writeEndArray();
generator.writeEndObject();
generator.close(); // to close the generator
System.out.println(jsonObjectWriter.toString());
}
}Output
{
"empid" : "120",
"firstName" : "Ravi",
"lastName" : "Chandra",
"technologies" : [ "SAP", "Java", "Selenium" ]
}
Updated on: 06-Jul-2020
4K+ Views
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