freeswitch 按键采集_freeswitch笔记(9)-esl outbound中如何放音采集按键？
正确姿势：必须在事件订阅的回调里，才能拿到用户按键值
示例代码：
package org.freeswitch.esl.client;
import org.freeswitch.esl.client.dptools.Execute;
import org.freeswitch.esl.client.dptools.ExecuteException;
import org.freeswitch.esl.client.internal.Context;
import org.freeswitch.esl.client.outbound.IClientHandler;
import org.freeswitch.esl.client.outbound.IClientHandlerFactory;
import org.freeswitch.esl.client.outbound.SocketClient;
import org.freeswitch.esl.client.transport.event.EslEvent;
import org.freeswitch.esl.client.transport.message.EslHeaders.Name;
import org.freeswitch.esl.client.transport.message.EslMessage;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.net.InetSocketAddress;
import java.util.regex.Pattern;
import static com.google.common.base.Throwables.throwIfUnchecked;
public class OutboundDTMFTest {
private static Logger logger = LoggerFactory.getLogger(OutboundDTMFTest.class);
private static String sb = "/usr/local/freeswitch/sounds/en/us/callie/ivr/8000/";
String prompt = sb + "ivr-please_enter_extension_followed_by_pound.wav";
String failed = sb + "ivr-that_was_an_invalid_entry.wav";
public static void main(String[] args) {
new OutboundDTMFTest();
}
public OutboundDTMFTest() {
try {
//outbound test
final SocketClient outboundServer = new SocketClient(
new InetSocketAddress("localhost", 8086),
new OutboundHandlerFactory());
outboundServer.startAsync();
} catch (Throwable t) {
throwIfUnchecked(t);
}
}
public class OutboundHandlerFactory implements IClientHandlerFactory {
@Override
public IClientHandler createClientHandler() {
//just for sample , recommend use singleton pattern, to avoid new too many instance
return new OutboundHandler();
}
}
public class OutboundHandler implements IClientHandler {
StringBuffer buffer = new StringBuffer(10);
String pattern1 = "^\\d+";
String pattern2 = "^\\d+#$";
@Override
public void onConnect(Context context, EslEvent eslEvent) {
try {
Execute exe = new Execute(context, "");
//订阅DTMF事件
EslMessage eslMessage = context.sendCommand("event plain DTMF");
if (eslMessage.getHeaderValue(Name.REPLY_TEXT).startsWith("+OK")) {
logger.info("subscribe event success!");
}
exe.answer();
int timeOutSeconds = 30;
//放音采集
exe.playAndGetDigits(1,
1, 10, timeOutSeconds * 1000, "#", prompt,
failed, pattern1, timeOutSeconds * 1000);
//等待用户输入按键
long start = System.currentTimeMillis();
while (true) {
if (System.currentTimeMillis() - start > timeOutSeconds * 1000) {
break;
}
if (buffer.length() > 0 && Pattern.matches(pattern2, buffer.toString())) {
break;
}
Thread.sleep(50);
}
System.out.println("you pressed:" + buffer.toString());
} catch (ExecuteException | InterruptedException e) {
logger.error("Could not prompt for digits", e);
} finally {
context.closeChannel();
}
}
@Override
public void onEslEvent(Context ctx, EslEvent event) {
// System.out.println(event.getEventName());
if (event.getEventName().equalsIgnoreCase("DTMF")) {
String key = event.getEventHeaders().get("DTMF-Digit");
if ("#".equalsIgnoreCase(key)) {
//检查是否输入正确(如果错误，请将之前输入的清空掉)
if (!Pattern.matches(pattern1, buffer.toString())) {
buffer.setLength(0);
return;
}
}
buffer.append(key);
}
}
}
}
解释一下：
1. 首先要订阅DTMF事件，只有在事件回调里，才能拿到用户按键信息
2. playAndGetDigits 在outbound async full异步模式下，这个方法的返回值，其实没啥用，永远都是__undef__，所以要在后面循环检测结果，还要考虑用户一直不按键的情况，要有超时保底
3. 事件回调onEslEvent与用户进线onConnect是在2个不同的方法中，但是都是在同一个线程里的，所以为方便起见，用了一个线程安全的StringBuffer用来保存按键信息
4. 事件回调中，要考虑用户按错键的情况，比如提示用户按数字键，然后用户输入了字母或星号之类的，遇到这种要把之前的输入结果清掉。