jooby: gson module

1. Gson

JSON support using Gson library.

1.1. Usage

1) Add the dependency:

Maven

Gradle

<dependency>
  <groupId>io.jooby</groupId>
  <artifactId>jooby-gson</artifactId>
  <version>3.5.5</version>
</dependency>

implementation 'io.jooby:jooby-gson:3.5.5'

2) Install and encode/decode JSON

Java

Kotlin

import io.jooby.gson.GsonModule;

{
  install(new GsonModule());                        (1)

  get("/", ctx -> {
    MyObject myObject = ...;
    return myObject;                                (2)
  });

  post("/", ctx -> {
    MyObject myObject = ctx.body(MyObject.class);   (3)
    ...
  });
}

import io.jooby.gson.GsonModule

{
  install(GsonModule())                             (1)

  get("/") {
    val myObject = ...;
    myObject                                        (2)
  }

  post("/") {
    val myObject = ctx.body<MyObject>()             (3)
    ...
  }
}

1	Install Gson
2	Use Gson to encode arbitrary object as JSON
3	Use Gson to decode JSON to Java object. Client must specify the `Content-Type: application/json` header

1.2. Working with Gson

Access to default object mapper is available via require call:

Default object mapper

Java

Kotlin

import io.jooby.gson.GsonModule;

{
  install(new GsonModule());

  Gson gson = require(Gson.class);

  ...
}

import io.jooby.gson.GsonModule

{
  install(GsonModule())

  val mapper = require<Gson>()
}

You can provide your own Gson:

Custom ObjectMapper

Java

Kotlin

import io.jooby.gson.GsonModule;

{
  Gson gson = new GsonBuilder().create();

  install(new GsonModule(gson));
}

import io.jooby.gson.GsonModule

{
  val gson = GsonBuilder().create()

  install(GsonModule(gson))
}