ActiveMQ使用(一):在JavaScript中使用stomp.js
1. 环境准备
jQuery-1.10
下载地址:https://www.jsdelivr.com/package/npm/jquery-1.10.2?tab=filesstomp.js 2.3.3:
下载地址:https://www.jsdelivr.com/package/npm/stompjs
2. 相关代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<div class="connect-input-box">
<label for="host">host:</label>
<input type="text" name="host" placeholder="input host" value="127.0.0.1"><br>
<label for="port">port:</label>
<input type="text" name="port" placeholder="input port" value="61614"><br>
<label for="clientId">client id:</label>
<input type="text" name="clientId" placeholder="input client id"><br>
<label for="userId">user id:</label>
<input type="text" name="userId" placeholder="input user id" value="user"><br>
<label for="password">password:</label>
<input type="text" name="password" placeholder="input password" value="pass"><br>
<label for="destination">destination:</label>
<input type="text" name="destination" placeholder="input destination" value="world"><br>
<button id="connect" type="submit">connect</button>
<button id="disconnect" type="submit">disconnect</button>
</div>
<div class="log-box">
<p id="log-show"></p>
</div>
<div class="send-message-box">
<label for="topic">topic:</label>
<input type="text" name="topic"><br>
<label for="queue">queue:</label>
<input type="text" name="queue"><br>
<input type="text" name="message"><br>
<button id="send">send</button>
</div>
<div class="subscribe-box">
<label for="subscribe-topic">subscribe-topic:</label>
<input type="text" name="subscribe-topic">
<button id="subscribe">subscribe</button>
</div>
<div class="unsubscribe-box">
<label for="unsubscribe-topic"></label>
<input type="text" name="unsubscribe-topic">
<button id="unsubscribe">unsubscribe</button>
</div>
<script src="plugins/jquery-1.10.1.js"></script>
<script src="plugins/stomp.js"></script>
<script type="module">
$(() => {
console.log('mqtt: ', Stomp)
$('input[name="clientId"]').val("example-" + Math.floor(Math.random() * 10000))
if (!window.WebSocket) {
console.log('不支持WebSocket')
} else {
}
})
var client, destination
$('#connect').click(() => {
var host = $('input[name="host"]').val()
var port = $('input[name="port"]').val()
var clientId = $('input[name="clientId"]').val()
var user = $('input[name="userId"]').val()
var password = $('input[name="password"]').val()
destination = $('input[name="destination"]').val()
console.log(host)
// 创建一个client 实例
let url = 'ws://' + host + ':' + port + '/stomp'
client = Stomp.client(url)
console.log(client)
let headers = {
login: user,
passcode: password,
'client-id': clientId
}
client.connect(headers, () => {
console.log('connect success')
client.subscribe(destination, (message) => {
if (message.body) {
console.log('get body ' + message.body)
} else {
console.log('got empty message')
}
})
}, () => {
console.log('connect failed')
})
})
// 断开连接
$('#disconnect').click(() => {
console.log('disconnect');
client.disconnect(() => {
console.log('disconnect')
})
})
// 发送消息
$('#send').click(() => {
console.log('send')
let topic = $('input[name="topic"]').val()
let payload = $('input[name="message"]').val()
let headers = {}
client.send(topic, headers, payload)
})
var subscribeId = null
// 订阅主题
$('#subscribe').click(() => {
console.log('subscribe')
let topic = $('input[name="subscribe-topic"]').val()
subscribeId = client.subscribe(topic, (message) => {
if (message.body) {
console.log('message body: ' + message.body)
} else {
console.log('empty message')
}
}, {id: '123123'})
})
// 取消订阅主题
$('#unsubscribe').click(() => {
console.log('unsubscribe')
console.log(subscribeId);
client.unsubscribe(subscribeId.id)
})
</script>
</body>
</html>
3. 结果展示
3.1 连接
3.2 订阅
3.3 发送消息
注意：默认发送点对点消息, 发送主题消息需要添加前缀/topic
3.4 取消订阅
3.5 断开连接
4. 相关参考
前端 Websocket + Stomp.js 的使用
stompjs的所有方法的使用
activemq BytesMessage || TextMessage
STOMP Over WebSocket
5. 注意
在
SprintBoot项目中集成ActiveMQ后，接收到的数据为字节数组
一种解决方式为:
@JmsListener(destination = "test_producer", containerFactory = "topicListenerContainer")
public void receiveTestProducer(Message message) throws JMSException {
String msg = StringUtils.activeMQMessageParse(message);
System.out.println("收到测试生产者的消息: " + msg);
}
public class StringUtils {
/**
* 将字符串进行分割并获得字节数组
* @param str 待处理字符串
* @param split 分割字符串
* @return 字节数组
*/
public static byte[] stringToBytes(String str, String split) {
String[] strArr = str.split(split);
byte[] byteArr = new byte[strArr.length];
for (int i = 0; i < strArr.length; i++) {
byteArr[i] = (byte) Integer.parseInt(strArr[i]);
}
return byteArr;
}
/**
* 根据字节数组获取指定字符集的字符串
* @param byteArr 字节数组
* @param charset 编码字符集
* @return 处理后的字符串
*/
public static String bytesToString(byte[] byteArr, Charset charset) {
return new String(byteArr, charset);
}
/**
* 将字符串根据分隔符转成字节数组，然后转成指定字符集的字符串
* @param str 待处理字符串
* @param split 分割字符串
* @param charset 指定字符集
* @return 处理后的字符串
*/
public static String stringToString(String str, String split, Charset charset) {
return bytesToString(stringToBytes(str, split), charset);
}
/**
* 将ActiveMQ接收到的消息转换为UTF-8字符串
* @param message
* @return
*/
public static String activeMQMessageParse(Message message) {
String str = null;
if (message instanceof ActiveMQTextMessage) {
ActiveMQTextMessage textMessage = (ActiveMQTextMessage) message;
try {
str = textMessage.getText().toString();
} catch (JMSException e) {
e.printStackTrace();
}
// System.out.println("text : " + textMessage.getText());
} else if (message instanceof ActiveMQBytesMessage) {
ActiveMQBytesMessage bytesMessage = (ActiveMQBytesMessage) message;
byte[] byteArr = new byte[0];
try {
byteArr = new byte[(int) bytesMessage.getBodyLength()];
int flag = bytesMessage.readBytes(byteArr);
str = bytesToString(byteArr, StandardCharsets.UTF_8);
// System.out.println("bytes : " + flag + " : " + str);
} catch (JMSException e) {
e.printStackTrace();
}
}
return str;
}
}
