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http://sunxiaodou.com/2017/08/02/Java通过ESL连接FreeSWITCH/
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Java通过ESL连接FreeSWITCH
创建Gradle项目
首先我们创建一个基于Gradle的Java工程，并添加FreeSWITCH ESL的Java依赖。
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| compile 'org.freeswitch.esl.client:org.freeswitch.esl.client:0.9.2'
|
![Project]()
创建ESLTest.java文件，并添加如下代码：
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| private static final Logger log = LoggerFactory.getLogger(ESLTest.class);
private static final String HOST = "192.168.1.22";
private static final int PORT = 8021;
private static final String PASSWORD = "ClueCon";
private static String job_UUID = null;
public static void main(String[] args) {
InBound();
}
private static void InBound() {
Client client = new Client();
try {
client.connect(HOST, PORT, PASSWORD, 20);
System.out.println("连接成功");
} catch (Exception e) {
log.error("Connect Failed", e);
}
client.addEventListener(new IEslEventListener() {
@Override
public void eventReceived(EslEvent event) {
if (event.getEventName().equals("CHANNEL_ANSWER")) {
System.out.println("通道应答");
} else if (event.getEventName().equals("HEARTBEAT")) {
System.out.println("收到心跳 --> " + event.getEventBodyLines());
job_UUID = client.sendAsyncApiCommand("status", null);
System.out.println("Job_UUID --> " + job_UUID);
} else if (event.getEventName().equals("CHANNEL_DESTROY")) {
System.out.println("通道销毁");
} else if (event.getEventName().equals("CHANNEL_HANGUP_COMPLETE")) {
System.out.println("通道挂断完成");
} else if (event.getEventName().equals("CHANNEL_CREATE")) {
System.out.println("通道创建");
}
}
@Override
public void backgroundJobResultReceived(EslEvent event) {
String uuid = event.getEventHeaders().get("Job-UUID");
if (job_UUID.equals(uuid)) {
for (String s : event.getEventBodyLines()) {
System.out.println(s);
}
}
}
});
client.setEventSubscriptions("plain", "all");
}
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我们使用InBound模式与FreeSWITCH进行连接，我这边的FreeSWITCH运行在192.168.1.22机器上，InBound模式默认是8021端口，密码默认为ClueCon，20为连接超时时长，单位秒。
FreeSWITCH每隔20秒会发送心跳事件，代码中收到心跳事件，会发送一个异步API去查看FreeSWITCH的状态，并返回一个Job_UUID，异步完成后通过backgroundJobResultReceived回调执行结果。
