Preguntas sobre Implementación de Soluciones con Frameworks

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

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

django-admin startproject myproject
cd myproject
python manage.py runserver

dotnet new webapi -n MyApi
cd MyApi
dotnet run

ng new my-angular-app
cd my-angular-app
ng serve

import javax.persistence.Entity;
import javax.persistence.Id;

@Entity
public class User {
    @Id
    private Long id;
    private String name;
    // getters and setters
}

from django.db import models

class User(models.Model):
    name = models.CharField(max_length=100)
    # other fields

using Microsoft.EntityFrameworkCore;

public class MyContext : DbContext {
    public DbSet Users { get; set; }
}

public class User {
    public int Id { get; set; }
    public string Name { get; set; }
}

export interface User {
    id: number;
    name: string;
}

@Service
public class UserService {
    private final UserRepository userRepository;

    @Autowired
    public UserService(UserRepository userRepository) {
        this.userRepository = userRepository;
    }
}

public void ConfigureServices(IServiceCollection services) {
    services.AddTransient();
}

@Injectable({
    providedIn: 'root'
})
export class UserService {
    constructor(private http: HttpClient) {}
}

const express = require('express');
const app = express();

app.use((req, res, next) => {
    console.log('Request received');
    next();
});

app.listen(3000, () => console.log('Server running'));

public void Configure(IApplicationBuilder app, IWebHostEnvironment env) {
    app.Use(async (context, next) => {
        Console.WriteLine("Request received");
        await next();
    });
}

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {
    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.inMemoryAuthentication()
            .withUser("user").password("{noop}password").roles("USER");
    }
}

public void ConfigureServices(IServiceCollection services) {
    services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
        .AddJwtBearer(options => {
            options.TokenValidationParameters = new TokenValidationParameters {
                // Configuration
            };
        });
}

import { HttpClient } from '@angular/common/http';
import { Injectable } from '@angular/core';

@Injectable({
    providedIn: 'root'
})
export class AuthService {
    constructor(private http: HttpClient) {}
}

@RestController
@RequestMapping("/api")
public class UserController {
    @GetMapping("/users")
    public List getUsers() {
        // Implementation
    }
}

from rest_framework import viewsets
from .models import User
from .serializers import UserSerializer

class UserViewSet(viewsets.ModelViewSet):
    queryset = User.objects.all()
    serializer_class = UserSerializer

[ApiController]
[Route("api/[controller]")]
public class UsersController : ControllerBase {
    [HttpGet]
    public IEnumerable Get() {
        // Implementation
    }
}

import { HttpClient } from '@angular/common/http';
import { Injectable } from '@angular/core';

@Injectable({
    providedIn: 'root'
})
export class UserService {
    constructor(private http: HttpClient) {}

    getUsers() {
        return this.http.get('/api/users');
    }
}

@ControllerAdvice
public class GlobalExceptionHandler {
    @ExceptionHandler(Exception.class)
    public ResponseEntity handleException(Exception e) {
        return new ResponseEntity<>(e.getMessage(), HttpStatus.INTERNAL_SERVER_ERROR);
    }
}

public void Configure(IApplicationBuilder app, IWebHostEnvironment env) {
    app.UseExceptionHandler("/Home/Error");
}

import { HttpErrorResponse } from '@angular/common/http';
import { Injectable } from '@angular/core';

@Injectable({
    providedIn: 'root'
})
export class ErrorHandlerService {
    handleError(error: HttpErrorResponse) {
        console.error('An error occurred:', error.message);
    }
}

FROM openjdk:11-jre
COPY target/myapp.jar /app/myapp.jar
CMD ["java", "-jar", "/app/myapp.jar"]

FROM python:3.8-slim
COPY requirements.txt /app/
RUN pip install -r /app/requirements.txt
COPY . /app/
CMD ["python", "/app/app.py"]

FROM mcr.microsoft.com/dotnet/aspnet:5.0
WORKDIR /app
COPY bin/Release/net5.0/publish/ .
ENTRYPOINT ["dotnet", "MyApp.dll"]

FROM node:14
WORKDIR /app
COPY package*.json ./
RUN npm install
COPY . .
RUN npm run build --prod
CMD ["http-server", "dist/my-angular-app"]

@RestController
@RequestMapping("/api")
public class UserController {
    @GetMapping("/users")
    public ResponseEntity> getUsers() {
        return ResponseEntity.ok(userService.getUsers());
    }
}

import requests

response = requests.get('https://api.example.com/users')
users = response.json()

using System.Net.Http;
using System.Threading.Tasks;

public class UserService {
    private readonly HttpClient _httpClient;

    public UserService(HttpClient httpClient) {
        _httpClient = httpClient;
    }

    public async Task> GetUsersAsync() {
        var response = await _httpClient.GetStringAsync("https://api.example.com/users");
        return JsonConvert.DeserializeObject>(response);
    }
}

import { HttpClient } from '@angular/common/http';
import { Injectable } from '@angular/core';

@Injectable({
    providedIn: 'root'
})
export class UserService {
    constructor(private http: HttpClient) {}

    getUsers() {
        return this.http.get('https://api.example.com/users');
    }
}

@RestController
@RequestMapping("/api/v1")
public class UserController {
    @GetMapping("/users")
    public List getUsers() {
        // Implementation
    }
}

[ApiController]
[Route("api/v{version:apiVersion}/[controller]")]
public class UsersController : ControllerBase {
    [HttpGet]
    public IEnumerable Get() {
        // Implementation
    }
}

@RestController
@RequestMapping("/api")
public class UserController {
    @GetMapping("/users")
    public List getUsers() {
        // Fetch users from the database and return
    }
}

spring.datasource.url=jdbc:mysql://localhost:3306/mydatabase
spring.datasource.username=root
spring.datasource.password=password
spring.jpa.hibernate.ddl-auto=update

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'mydatabase',
        'USER': 'root',
        'PASSWORD': 'password',
        'HOST': 'localhost',
        'PORT': '3306',
    }
}

services.AddDbContext(options =>
    options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));

@Transactional
public class UserService {
    public void performTransactionalOperation() {
        // Implementation
    }
}

from django.db import transaction

@transaction.atomic
def perform_transactional_operation():
    # Implementation

using (var transaction = new TransactionScope()) {
    // Implementation
    transaction.Complete();
}

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {
    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.inMemoryAuthentication()
            .withUser("user").password("{noop}password").roles("USER");
    }
}

public void ConfigureServices(IServiceCollection services) {
    services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
            .AddCookie();
}

import { HttpClient } from '@angular/common/http';
import { Injectable } from '@angular/core';
import { Router } from '@angular/router';

@Injectable({
    providedIn: 'root'
})
export class AuthService {
    constructor(private http: HttpClient, private router: Router) {}

    login(credentials: { username: string; password: string }) {
        return this.http.post('/api/login', credentials).pipe(
            tap(() => this.router.navigate(['/home']))
        );
    }

    logout() {
        // Implementation
    }
}

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.sessionManagement()
            .sessionCreationPolicy(SessionCreationPolicy.STATELESS);
    }
}

public void ConfigureServices(IServiceCollection services) {
    services.AddSession();
    services.AddDistributedMemoryCache();
}

@Configuration
@EnableCaching
public class CacheConfig {
    @Bean
    public CacheManager cacheManager() {
        return new ConcurrentMapCacheManager("items");
    }
}

CACHES = {
    'default': {
        'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
    }
}

public void ConfigureServices(IServiceCollection services) {
    services.AddMemoryCache();
}

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests()
            .antMatchers("/admin/**").hasRole("ADMIN")
            .antMatchers("/user/**").hasRole("USER")
            .anyRequest().authenticated();
    }
}

public void ConfigureServices(IServiceCollection services) {
    services.AddAuthorization(options => {
        options.AddPolicy("AdminOnly", policy => policy.RequireRole("Admin"));
    });
}

@ControllerAdvice
public class GlobalExceptionHandler {
    @ExceptionHandler(Exception.class)
    public ResponseEntity handleException(Exception ex) {
        return new ResponseEntity<>(ex.getMessage(), HttpStatus.INTERNAL_SERVER_ERROR);
    }
}

public void Configure(IApplicationBuilder app, IHostingEnvironment env) {
    if (env.IsDevelopment()) {
        app.UseDeveloperExceptionPage();
    } else {
        app.UseExceptionHandler("/Home/Error");
        app.UseHsts();
    }
}

public void Configure(IApplicationBuilder app) {
    app.Use(async (context, next) => {
        // Middleware logic
        await next.Invoke();
    });
}

@Component
public class CustomFilter implements Filter {
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        // Filter logic
        chain.doFilter(request, response);
    }
}

class CustomMiddleware:
    def __init__(self, get_response):
        self.get_response = get_response

    def __call__(self, request):
        # Middleware logic
        response = self.get_response(request)
        return response

public class CustomFilter : IAsyncActionFilter {
    public async Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next) {
        // Filter logic
        await next();
    }
}

public Page getUsers(Pageable pageable) {
    return userRepository.findAll(pageable);
}

from django.core.paginator import Paginator

def get_users(request):
    users = User.objects.all()
    paginator = Paginator(users, 10)
    page_number = request.GET.get('page')
    page_obj = paginator.get_page(page_number)
    return render(request, 'users.html', {'page_obj': page_obj})

public IActionResult GetUsers(int pageNumber = 1, int pageSize = 10) {
    var users = _userRepository.GetUsers(pageNumber, pageSize);
    return View(users);
}

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
            .authorizeRequests()
            .anyRequest().authenticated()
            .and()
            .formLogin();
    }
}

public void ConfigureServices(IServiceCollection services) {
    services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
            .AddCookie();
    services.AddAuthorization();
}

@PostMapping("/upload")
public ResponseEntity uploadFile(@RequestParam("file") MultipartFile file) {
    // Handling file
    return ResponseEntity.ok("File uploaded successfully");
}

from django.core.files.storage import FileSystemStorage

def upload_file(request):
    if request.method == 'POST' and request.FILES['file']:
        file = request.FILES['file']
        fs = FileSystemStorage()
        filename = fs.save(file.name, file)
        return HttpResponse('File uploaded successfully')

[HttpPost("upload")]
public async Task UploadFile(IFormFile file) {
    if (file != null && file.Length > 0) {
        var filePath = Path.Combine("uploads", file.FileName);
        using (var stream = new FileStream(filePath, FileMode.Create)) {
            await file.CopyToAsync(stream);
        }
        return Ok("File uploaded successfully");
    }
    return BadRequest("No file uploaded");
}

import { HttpClient } from '@angular/common/http';

@Injectable({
    providedIn: 'root'
})
export class FileService {
    constructor(private http: HttpClient) {}

    upload(file: File) {
        const formData = new FormData();
        formData.append('file', file);
        return this.http.post('/upload', formData);
    }
}