How to use stomp in uniapp

With the development of modern web applications, more and more developers are using WebSocket technology for real-time communication. However, if you need to use a message broker, specifically ActiveMQ or RabbitMQ, then the STOMP protocol is another option worth considering. When developing mobile applications, Uniapp is a development framework worth trying, which can help you develop cross-platform applications in a more efficient way. In this article, we will explore how to use STOMP protocol for real-time communication in Uniapp.

First, we need to understand the basic concepts and usage of the STOMP protocol. STOMP (Simple (or Streaming) Text Oriented Messaging Protocol) is a text-based protocol that is generally used for communication between message brokers, but can also be used for communication between browsers and servers. It is designed to be simple, easy to implement, and supports multiple programming languages. It is based on the client-server model and operates on messages using commands and message headers.

To use the STOMP protocol in Uniapp, we need to use a STOMP client. Below we'll look at using a JavaScript library called stompjs to achieve this. Stompjs is a stable, reliable library with widespread use and available through the npm package manager.

First, in the root directory of the Uniapp project, open a terminal and install stompjs:

npm install stompjs --save

In Uniapp, we use Vue.js for development, so we need to combine stompjs with Vue.js integrated. We can create a Vue.js plugin that will register the STOMP client in the application context.

Create a file named stomp.js in the src/plugins directory, which will look like this:

import Stomp from 'stompjs';

const setConnected = connected => {
    store.commit('stomp/setConnected', connected);
};

const stompPlugin = {
    install(Vue, options) {
        const { url, username, password } = options;
        const socket = new WebSocket(url);
        const stompClient = Stomp.over(socket);

        // set stompClient's credentials if needed
        if (username && password) {
            stompClient.connect(username, password, () => {
                setConnected(true);
            });
        } else {
            stompClient.connect({}, () => {
                setConnected(true);
            });
        }

        Vue.prototype.$stompClient = stompClient;
    },
};

export default stompPlugin;

The plugin accepts the stomp.js configuration object. where url is the STOMP proxy's WebSocket endpoint address, and username and password are optional STOMP proxy credentials.

Next, we need to load the stomp.js plug-in and all its configurations in the main.js file of the Vue application, as shown below:

import Vue from 'vue';
import App from './App';
import router from './router';
import store from './store';

import stompPlugin from '@/plugins/stomp';

Vue.config.productionTip = false;

Vue.use(stompPlugin, {
    url: 'ws://localhost:15674/ws',
    username: 'guest',
    password: 'guest',
});

new Vue({
    router,
    store,
    render: h => h(App),
}).$mount('#app');

The above code will load the stomp.js plug-in Mount it on Vue and pass its configuration along with the options object. Additionally, we need to define some states and actions in the Vue application’s store.js file in order to track the STOMP client’s connection status. This is what the store.js file looks like:

const stomp = {
    state: {
        connected: false,
    },
    getters: {
        connected: state => state.connected,
    },
    mutations: {
        setConnected(state, connected) {
            state.connected = connected;
        },
    },
    actions: {},
};

export default new Vuex.Store({
    modules: {
        stomp,
    },
});

Finally, we need to test whether the connection was successful. Add the following code to your Vue component:

export default {
    mounted() {
        // subscribe to our demo channel:
        this.$stompClient.subscribe('/queue/demo', message => {
            console.log(message.body);
        });
    },
};

In the above code, we use this.$stompClient to obtain the registered STOMP client instance, and subscribe to one named demo through its subscribe() method queue. When new messages arrive, we will receive console.log() output.

Now, you can use the STOMP protocol for real-time communication in Uniapp. Such real-time communication can be very useful in many application scenarios. Of course, the specific implementation will vary depending on the respective project, but the above method is enough to provide you with an inspiration.

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