Demo :: Develop RESTful web service with Spark

Exception.java

exception(IllegalArgumentException.class, (e, req, res) -> {
	res.status(400);
	res.body(toJson(new ResponseError(e)));
});

Exception2.java

exception(IllegalArgumentException.class, new ExceptionHandler() {
			
	@Override
	public void handle(Exception exception, Request request, Response response) {
		response.status(400);
		response.body(JsonUtil.toJson(new ResponseError(exception)));
	}
});

HelloWorld.java

import static spark.Spark.*;

public class HelloWorld {
   public static void main(String[] args) {
   
      get("/hello", (req, res) -> "Hello World");
   
   }
}

HelloWorld2.java

public class HelloWorld {
	public static void main(String[] args) {
		get("/hello", new Route() {
			@Override
			public Object handle(Request arg0, Response arg1) {
				return "Hello World";
			}
		});
	}
}

Main.java

public class Main {
	public static void main(String[] args) {
		new ProductController(new ProductService());
	}
}

Product.java

public class Product {
	private String productId;
	private String productName;
	private String productDescription;
	private Double price;
	private Date createDate;
	...
}

ProductController.java

public class ProductController {

	public ProductController(final ProductService productService) {
		
		get("/products", (request, response) -> productService.getAllProduct(), json());
		
		get("/product/:id", (request, response) -> {
			String id = request.params(":id");
			return productService.getProduct(id);
		}, json());
		
		post("/product", (req, res) -> productService.createNewProduct(
				req.queryParams("name"),
				Double.valueOf(req.queryParams("price"))
		), json());
	}
}

ProductController2.java

public class ProductController {

	public ProductController(final ProductService productService) {
		get("/products", new Route() {
			public Object handle(Request request, Response response) {
				return JsonUtil.toJson(productService.getAllProduct());
			}
		});
		get("/product/:id", new Route() {
			public Object handle(Request request, Response response) {
				Product product = productService.getProduct(request
						.params(":id"));
				return JsonUtil.toJson(product);
			}
		});

		post("/product", new Route() {
			public Object handle(Request request, Response response) {
				Product product = productService.createNewProduct(
						request.queryParams("name"),
						Double.valueOf(request.queryParams("price")));
				return JsonUtil.toJson(product);
			}
		});
	}
}