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What is the purpose of the ServletResponse interface?

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Answer from AI

The ServletResponse interface is used to send a response to the client (browser) from a servlet. It provides methods for:

Setting the content type (MIME type) of the response.
Setting the character encoding.
Writing the response body to the output stream.
Setting the HTTP status code of the response (e.g., 200 OK, 404 Not Found).
Adding HTTP headers to the response.
Redirecting the client to another URL.

Example of obtaining the output stream to write the response body:

// Import class
import javax.servlet.ServletResponse;
import java.io.PrintWriter;
import java.io.IOException;

// Inside a method like service
public void someMethod(ServletResponse response) throws IOException {
    response.setContentType("text/html"); // Set content type
    response.setCharacterEncoding("UTF-8"); // Set encoding

    PrintWriter out = response.getWriter(); // Get output stream
    out.println("<html><body>");
    out.println("<h1>Hello, world!</h1>");
    out.println("</body></html>");
    out.close(); // Close stream
}

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