mainCepSearch is a Java application designed to validate and retrieve information about Brazilian postal codes (CEPs) using the CEP Aberto API. The application prompts the user to input a CEP, validates it, and if valid, queries the CEP Aberto API to fetch details about the location associated with the CEP.

• Validates Brazilian CEP format.
• Uses the CEP Aberto API to fetch location information.
• Displays the city and state of the provided CEP.
• Handles and displays error messages for invalid CEPs and API errors.

• A valid CEP Aberto API token

1. Run the application

2. Input a CEP:

   • When prompted, enter a valid Brazilian CEP (e.g., 01001000).

• mainCepSearch: Main class containing the application's entry point.
• CepInfo: Model class to map the JSON response from the CEP Aberto API.
• CepValidator: Utility class for validating CEP format.
• EnvLoader: Utility class for loading environment variables from a .env file.

1. Running the application:

   mvn exec:java -Dexec.mainClass="mainCepSearch"

2. Entering a CEP:

   Por favor, insira um CEP: 01001000
   

3. Expected Output:

   São Paulo-SP
   

• If an invalid CEP is entered:

  O CEP inserido é inválido: 12345678
  

• If there is an error with the API request (e.g., invalid token or network issue):

  Error: 401
  Error message: Unauthorized
  

• gson: For parsing JSON responses from the API.
• java.net.http.HttpClient: For making HTTP requests to the CEP Aberto API.