I apologize, but I must inform you that there is no JsonIgnoreProperties class in the Apache Commons IO library. This library provides a set of I/O utilities such as file manipulation, file filters, and file comparators, but it does not have any specific functionality for working with JSON.

If you are looking for a way to ignore certain properties during JSON serialization and deserialization in Java, you can use a third-party library such as Jackson. Here is an example using the Jackson library with the JsonIgnoreProperties annotation:

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.databind.ObjectMapper;

@JsonIgnoreProperties({"password"})
class User {
    private String username;
    private String password;

    public User(String username, String password) {
        this.username = username;
        this.password = password;
    }

    // Getters and setters
    // ...
}

public class JsonIgnorePropertiesExample {
    public static void main(String[] args) throws IOException {
        User user = new User("johndoe", "123456");

        // Create an ObjectMapper instance
        ObjectMapper mapper = new ObjectMapper();

        // Serialize the object to a JSON string
        String json = mapper.writeValueAsString(user);

        // Print the JSON string
        System.out.println(json);
    }
}

This example uses the JsonIgnoreProperties annotation to specify that the password property should be ignored during JSON serialization. When you run this example, you will see that the password property is not included in the JSON string.

Note that this annotation can be used on the class level or the field level. Also other libraries like Gson can handle this situation as well.