Daikon Gson

Daikon Gson is a library that add to Daikon the ability to handle Json requests and responses.

The main goals are:

• Help in rendering an object as Json in the response
• Help in parsing a Json request to an object

How to add Daikon Gson to your project

Gradle

• Add JitPack in your root build.gradle at the end of repositories:

repositories {
    ...
    maven { url 'https://jitpack.io' }
}

• Add the dependency

implementation('com.github.DaikonWeb:daikon-gson:1.9.0')

Maven

• Add the JitPack repository to your build file

<repositories>
    <repository>
        <id>jitpack.io</id>
        <url>https://jitpack.io</url>
    </repository>
</repositories>

• Add the dependency

<dependency>
    <groupId>com.github.DaikonWeb</groupId>
    <artifactId>daikon-gson</artifactId>
    <version>1.9.0</version>
</dependency>

How to use

data class Result(val message: String, val code: String)

HttpServer()
    .post("/") { req, res -> res.json(req.json<Result>()) }
    .start().use {
        val response = post(url = "http://localhost:4545/", json = mapOf("message" to "ciao", "code" to "HELLO_ITA"))
        assertThat(response.text).isEqualTo("""{"message":"ciao","code":"HELLO_ITA"}""")
        assertThat(response.headers["Content-Type"]).isEqualTo(APPLICATION_JSON_UTF_8.asString())
    }

Custom Serializer and Deserializer

data class Appointment(val message: String, val date: LocalDate)

HttpServer()
     .post("/") { req, res ->
         val dateDeserializer = Deserializer(LocalDate::class) { json: JsonElement, _, _ -> parse(json.asString) }
         val dateSerializer = Serializer(LocalDate::class) { date: LocalDate, _, _ -> JsonPrimitive(date.format(ofPattern("dd/MM/yyyy"))) }

         res.json(req.json<Appointment>(dateDeserializer), dateSerializer)
     }
     .start().use {
         val response = post(url = "http://localhost:4545/", data = """{"message":"Eat a Daikon","date":"2020-01-31"}""")
         assertThat(response.text).isEqualTo("""{"message":"Eat a Daikon","date":"31/01/2020"}""")
     }

Resources

• Documentation: https://daikonweb.github.io
• Examples: https://github.com/DaikonWeb/daikon-examples
• Gson project: https://github.com/google/gson

Authors

• Marco Fracassi
• Alessio Coser

License

This project is licensed under the Apache License 2.0 - see the LICENSE file for details