J-String

J-String is a library written in Java that makes it easy for you to generate a JSON string from java class type for the test.

How to work

To generate JSON string , Call JsonGenerator.generate() method with a Java Class Type want to generate.

public interface JsonGenerator {
    <T> String generate(Class<T> type);
}

When given a type, J-String generates the tree consist of JsonFieldDefinition.

suppose that there are the below types

class Member{
  private String name;
  private int age;
  private Address address;
  private boolean gender;
  private List<Belonging> belongings;
}

class Address{
  private String state;
  private String city;
  private String street;
}

class Belonging{
  private String name;
  private int count;
}

create the below tree.

The JSON string is generated by based above tress

{
  "name": "String",
  "age": 1,
  "address": {
    "state": "String",
    "city": "String",
    "street": "String"
  },
  "gender": true,
  "belongings": [
    {
      "name": "String",
      "count": 1
    }
  ]
}

J-String can generate JSON from classes composed of the following types:

• Number
  • byte, Byte
  • short, Short
  • int, Integer
  • long, Long
  • float, Float
  • double, Double
• String
• Boolean
• Object
  • The ClassLoader of object type is must be the AppClassLoader.
• Array
  • List<T>
  • Set<T>
• Enum
• Date and Time
  • LocalDate
  • LocalTime
  • LocalDateTime
  • ZonedDateTime
  • Instant

Sample

class IntegrationTest{
  private String name;
  private Integer age;
  private boolean gender;
  private ObjectType object;
  private List<List<ObjectType>> array;
}

class ObjectType{
  private String value;
}

List<ValueGenerator> generators = new ArrayList<>();
generators.add(new StringGenerator());
generators.add(new NumberGenerator());
generators.add(new BooleanGenerator());

JsonGenerator generator = new StandardJsonGenerator(generators);

String json = generator.generateFieldsOfType(IntegrationTest.class);

{
  "name":"String",
  "age":1,
  "gender":true,
  "object":{
    "value":"String"
  },
  "array":[
    [
      {
        "value":"String"
      }
    ]
  ]
}

To Do

• generate a custom value