• TOC

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Introduction

Jackson is a multi-purpose Java library for processing JSON data format.

Offers 3 methods of processing

1. Streaming API or incremental parsing/generation: reads and writes JSON content as discrete events
2. Tree model: provides a mutable in-memory tree representation of a JSON document
3. Data binding: converts JSON to and from POJO’s

dependencies

• jackson-core-2.3.1.jar
• jackson-databind-2.3.1.jar
• jackson-annotations-2.3.1.jar

@Test
public void whenSerializeAndDeserializeUsingJackson_thenCorrect()
  throws IOException{
    Foo foo = new Foo(1,"first");
    ObjectMapper mapper = new ObjectMapper();

    String jsonStr = mapper.writeValueAsString(foo);
    Foo result = mapper.readValue(jsonStr, Foo.class);
    assertEquals(foo.getId(),result.getId());
}

ObjectMapper mapper = new ObjectMapper();
    String jsonInput = "{\"id\":0,\"firstName\":\"Robin\",\"lastName\":\"Wilson\"}";
    Person q = mapper.readValue(jsonInput, Person.class);
    System.out.println("Read and parsed Person from JSON: " + q);

    Person p = new Person("Roger", "Rabbit");
    System.out.print("Person object " + p + " as JSON = ");
    mapper.writeValue(System.out, p);