Enterprise Application: Creating a Web Service in C#, Java (using Spring Boot), and Golang

Creating a web service involves using frameworks or libraries specific to the programming language. Here are simple examples of creating a web service in C#, Java (using Spring Boot), and Golang. These examples demonstrate a basic HTTP server serving a “Hello, World!” message. For a real-world application, you would typically define routes, handle requests, and interact with databases or external services.

C# (.NET Core) Web Service:

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;

class Program
{
    static void Main()
    {
        var host = new WebHostBuilder()
            .UseKestrel()
            .ConfigureServices(services => services.AddMvc())
            .Configure(app => app.UseMvcWithDefaultRoute())
            .Build();

        host.Run();
    }
}

public class Startup
{
    public void Configure(IApplicationBuilder app)
    {
        app.UseMvc();
    }
}

public class HomeController
{
    public string Index()
    {
        return "Hello, World! from C# Web Service";
    }
}

Java (Spring Boot) Web Service:

Create a new file named Application.java:

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

@RestController
class HelloWorldController {
    @GetMapping("/")
    public String helloWorld() {
        return "Hello, World! from Java Web Service";
    }
}

Golang (Go) Web Service:

package main

import (
    "fmt"
    "net/http"
)

func handler(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintf(w, "Hello, World! from Golang Web Service")
}

func main() {
    http.HandleFunc("/", handler)
    http.ListenAndServe(":8080", nil)
}

These examples use different frameworks (ASP.NET Core for C#, Spring Boot for Java, and the standard library for Golang) to create a simple web service. Run these programs, and you will have a web service running at http://localhost:8080 for Golang and Java, and http://localhost:5000 for C#. You can modify and extend these examples based on your specific requirements.