Jackson Streaming API to Write JSON

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In this tutorial we are going to see how to write JSON into file using JsonGenerator class available in Jackson.Jackson Streaming API is high-performance Java API for read write JSON.
JsonGenerator – is used to write JSON as String and File.
1. Create project called JSONExample.
2. Create package called com.javatutorialscorner.jackson 
3. add jackson-mapper-asl-1.9.13.jar, jackson-core-asl-1.9.13.jar into build path.
4. Create java class called JSONGeneratorExample under com.javatutorialscorner.jackson
JSONGeneratorExample.java

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01.package com.javatutorialscorner.jackson;

02. 

03.import java.io.File;

04.import java.io.IOException;

05. 

06.import org.codehaus.jackson.JsonEncoding;

07.import org.codehaus.jackson.JsonFactory;

08.import org.codehaus.jackson.JsonGenerator;

09. 

10.public class JSONGeneratorExample {

11. 

12. /**

13.  * @param args

14.  */

15. public static void main(String[] args) {

16.  // TODO Auto-generated method stub

17.  JsonFactory factory = null;

18.  JsonGenerator jsonGenerator = null;

19. 

20.  try {

21.   factory = new JsonFactory();

22.   jsonGenerator = factory.createJsonGenerator(new File(

23.     "C:\\jtc\\javatutorialscorner.json"), JsonEncoding.UTF8);

24.   jsonGenerator.writeStartObject();

25.   jsonGenerator.writeStringField("name", "Java Tutorials Corner");

26.   jsonGenerator.writeNumberField("rank", 1);

27.   jsonGenerator.writeFieldName("Tutorials");

28.   jsonGenerator.writeStartArray();

29.   jsonGenerator.writeString("Java");

30.   jsonGenerator.writeString("Servlet");

31.   jsonGenerator.writeString("JSP");

32.   jsonGenerator.writeString("Struts 1.x");

33.   jsonGenerator.writeString("Struts 2.x");

34.   jsonGenerator.writeString("Spring");

35.   jsonGenerator.writeString("Hibernate");

36.   jsonGenerator.writeString("Log4j");

37.   jsonGenerator.writeString("JSON");

38.   jsonGenerator.writeString("Web Services");

39.   jsonGenerator.writeString("JSF");

40.   jsonGenerator.writeString("Eclipse");

41.   jsonGenerator.writeEndArray();

42.   jsonGenerator.writeEndObject();

43.   jsonGenerator.close();

44. 

45.  } catch (IOException e) {

46.   // TODO Auto-generated catch block

47.   e.printStackTrace();

48.  }

49. 

50. }

51. 

52.}

Now run the program see the file created at specified location with following content.

{"name":"Java Tutorials Corner","rank":1,"Tutorials":["Java","Servlet","JSP","Struts 1.x","Struts 2.x","Spring","Hibernate","Log4j","JSON","Web Services","JSF","Eclipse"]}

Jackson Java JSON 10/18/2013 06:50:00 pm