In this article, we will build the chat application with Spring Boot and WebSocket where anyone can communicate or chat with others. Just you need to type your name to and start chatting with others.

Boot chat

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in. WebSocket is a computer communications protocol, providing full-duplex communication channels over a single TCP connection. The protocol enables interaction between a web browser or other client application and a web server with lower overhead than half-duplex alternatives such as HTTP polling, facilitating real-time data transfer from and to the server. Once a websocket connection is established between a client and a server, both can exchange information until the connection is closed by any of the parties. This is the main reasion which websocket is preferred over the HTTP protocol when building a chat-like communication service that operates at high frequencies with low latency. It provides an interoperable wire format that allows STOMP clients to talk with any message broker supporting the protocol. STOMP is basically a messaging protocol which is useful for these functionalities.

Status message

But so far, what we already created in articles are broadcast applications. But in reality, don't want to broadcast every message to every user. In this tutorial we will learn on how to create a simple chat application, on how to use WebSocket and STOMP to send messages to a single user.

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In the story, we studied a use case of server-sent events, for a uni-direction communication from server to client. We also mentioned that WebSockets is bi-directional communication between server and client.

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In this story, we will study a popular use case of WebSockets. We will be building a one-to-one messaging application, which allows users to send private messages to each other.

Controllers

The below video demonstrates what we are going to build. A WebSocket is a protocol that boot chat a two-way communication between server and client. WebSockets is a low level protocol, which defines the way of transfer messages with no additional information about the incoming messages. For this reason, the WebSocket RFC defines the use of sub-protocols to define the structure and the standards for the messages. The first thing to think about the message model to exchange between server and client.

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The Chat message model looks like:. The chat message is a pretty straightforward, it has the basic fields to identify a chat message between sender and recipient. It also has a status field, which indicates if the message is delivered to the client. The message will be marked as delivered boot chat the client pulls the message.

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The chat notification looks like:. It has the new message id and boot chat info about the sender, so that, the client can display a new message notification or display the of the new messages received as shown in the below images. It also enables the SockJS fallback optionsso that alternative messaging options may be used if WebSockets are not available.

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In this section, we will create a controller that will handle user requests, it will receive a chat message from a user and send it to a recipient destination. This method, persists the message in MongoDB, then, calls convertAndSendToUser method to send the notification message to the user destination. The final destination will look like:. All the subscribers one subscriber in our case to the above destination, will get the message.

For each conversation between two users we create a chat room and generate a unique chat Boot chat to identify the conversation between the two users. The chat room boot chat looks like:.

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We will use SockJS and Stomp. It also defines a callback onConnected to be called upon a successful connection and, onError if an error occurred while connecting to the server.

Build a chat application using spring boot + websocket + rabbitmq

boot chat The onConnect method subscribes to the user specific destination, so that, it receives all the messages sent to that destination. You can find the example source code here. Follow to our community. Collection of best Java articles, tutorials, courses, books, and resources from Javarevisite and its authors, Java Experts and many more. Take a look. Review our Privacy Policy for more information about our privacy practices.

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Build a chat application using spring boot and websocket

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