RESTEZ

Develop:

An easier REST framework for Java. Inspired by ExpressJS for NodeJS.

Example setup with Jetty

Router router = new Router();

// Setup some default middleware
router.use(
new LoggingMiddleware(),  //predefined
(req, res, next) -> {    // a lambda
  try {
    next.handle(req, res);
  } catch (Throwable t) {
    log.error("", t);
    res.status(500);
  }
},
new BufferedSend(),  //predefined
new GZIPMiddleware() //predefined
);

// Wire up some routes
router.post("/p0$t/:param", (req, res) -> {
  res.send("Body: " + req.body() + " Param: " + req.params("param"));
});

router.get("/:name", (req, res) -> {
  res.send("OK! " + req.params("name"));
});

// Create a nested router
Router subrouter = new Router();

subrouter.get("/bar", (req, res) -> {
  Assert.assertEquals(req.path(), "/foo/bar");
});

router.use("/foo", subrouter);

// Wire up jetty

Server = new Server(port);

ServletHandler handler = new ServletHandler();
server.setHandler(handler);

ServletHolder s = new ServletHolder();
s.setServlet(new Application(router));

handler.addServletWithMapping(s, "/*");

server.start();

Serialization

Register a serializer and deserializer for a mime type. When content type matches the serializers content type the serializer will be used. Note: The following examples use Gson for serialization but can easily be replaced with jackson or any other framework. Gson is not shipped with Restez.

Serialize

When sending a response use Response.send(Object), if Response.send(String) is used, the default serializer will be used to turn the string into a UTF-8 encoded byte array. By default if there is no content type mapping for Response.send(Object) serialization will fail with an IllegalArgumentException, this can be disable my setting new Serializers(false). Disabling this behavior will cause the serializer to fallback to the default serializer.

registerJsonSerializer(ser) is syntactic sugar for registerSerializer("application/json", ser) Note, when sending a response response.json(obj) is short hand for response.contentType("application/json").send(obj).

Router router = new Router();

router.get("/users/:userId", (req, res) -> {
  res.json(Users.getById(req.params("userId")))
})

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

Serializers serializers = new Serializers()
  .registerJsonSerializer(obj -> gson.toJson(obj).getBytes());

Application app = new Application(router, serializers, deserializers);

startServer(app);

Deserialize

Use Request.body(Object, Class) to read the request body into an object.

private static class JsonDeserializationBody {
  String body;
}
  
  
Gson gson = new GsonBuilder().create();

Router router = new Router();
Deserializers deserializers = new Deserializers()

deserializers.registerJsonDeserializer(new Deserializer(){

  @Override
  public <T> T deserialize(byte[] o, Class<T> clazz) throws IOException {
    return gson.fromJson(new String(o), clazz);
  }

});

router.post("/json", (req, res) -> {
  JsonDeserializationBody b = req.body(JsonDeserializationBody.class);
  System.out.println(b.body);
  res.status(201);
});

Application app = new Application(router, serializers, deserializers);

startServer(app);