Jooby Responses Overview

Jooby is a web framework for Java that simplifies the process of handling HTTP responses. This guide provides an overview of how to manage responses in Jooby.

Key Concepts

• HTTP Responses: After processing a request, a server sends a response back to the client. Jooby allows developers to customize these responses easily.
• Response Types: Jooby supports various response types, such as JSON, HTML, plain text, and more.

Main Points

1. Basic Response Usage

• Default Response: When you define a route, Jooby automatically sends a response based on the return type of the handler method.

Example:

get("/hello", () -> "Hello World!");

This route returns a plain text response of "Hello World!".

2. Setting Response Status

• Custom Status Codes: You can specify HTTP status codes in your responses.

Example:

get("/notfound", ctx -> ctx.status(404).send("Not Found"));

This will return a 404 Not Found status with a message.

3. Different Response Formats

• JSON Responses: Jooby makes it easy to return JSON data.

Example:

get("/json", () -> new User("John", "Doe"));

This returns a JSON representation of a User object.

4. Sending Files

• File Responses: Jooby allows you to send files as responses.

Example:

get("/file", ctx -> ctx.sendFile(new File("path/to/file.txt")));

This will send the specified file to the client.

5. Error Handling

• Custom Error Responses: You can handle errors and send custom responses.

Example:

exception(Exception.class, (req, res, ex) -> res.status(500).send("Internal Server Error"));

This defines a global error handler for exceptions.

Conclusion

Jooby provides flexible and simple ways to manage HTTP responses, allowing developers to specify status codes, return different formats like JSON, send files, and handle errors effectively. This makes it a powerful tool for building web applications in Java.