python发送消息到activeMQ后java接收到BinaryMessage的坑

和另一个系统进行对接,使用activemq进行消息通信。对方使用java客户端监听一个topic，我们需要发送TextMessage消息，对方接收后进行处理。而我们因为系统架构的原因只能使用python进行推送，也就只能通过stomp协议发送消息。然后就遇到了问题，发送的消息在java消费者端只能解析成BinaryMessage，而发送的时候根本没有办法指定消息类型。网上搜了很久没有找到相同的情况。
根据官方通过python往ActiveMQ发送message的demo编写如下代码。

# -*-coding:utf-8-*-
import stomp
import time

queue_name = '/queue/SampleQueue'
topic_name = '/topic/SampleTopic'
listener_name = 'SampleListener'
test_name = "springBootMqQueue"
springBootMqQueue = '/queue/springBootMqQueue'


class SampleListener(object):
    def on_message(self, headers, message):
        print('headers: %s' % headers)
        print('message: %s' % message)


# 推送到队列queue
def send_to_queue(msg):
    conn = stomp.Connection10([('192.168.36.213', 61613)], auto_content_length=False)
    conn.connect('admin', 'admin', wait=True)
    conn.send(springBootMqQueue, msg)
    conn.disconnect()


##从队列接收消息
def receive_from_queue():
    conn = stomp.Connection10([('192.168.36.213', 61613)], auto_content_length=False)
    conn.set_listener(listener_name, SampleListener())
    conn.connect('admin', 'admin', wait=True)
    conn.subscribe(springBootMqQueue)
    time.sleep(1)  # secs
    conn.disconnect()


if __name__ == '__main__':
    send_to_queue('{"content":{"flow":{"network":"5","times":"1-1","url":"http://www.baidu.com","way":"5"},"sms":{"direction":"0","text":"短信内容详情"},"voice":{"connect":"5","key":"挂断"}},"form":"13901295021","formPort":"com4","interval":"2-2","network":"5","taskId":"1dsf3641212434g","times":"1-3","to":"18611010269","type":"1"}')
    receive_from_queue()

Stomp是一个很简单的协议，协议中不携带TextMessage和BytesMessage相关的信息，而是通过content-length header判断消息类型的。header中有content-length则说明是BytesMessage，否则是TextMessage。
接下来的问题就简单了，发送的时候不在header中携带content-length就可以了，查看send方法的源码发现

def __init__(self, transport, auto_content_length=True):
    self.transport = transport
    self.auto_content_length = auto_content_length
    transport.set_listener('protocol-listener', self)
    self.version = '1.0'

def send(self, destination, body, content_type=None, headers=None, **keyword_headers):
    """
    Send a message to a destination.

    :param str destination: the destination of the message (e.g. queue or topic name)
    :param body: the content of the message
    :param str content_type: the content type of the message
    :param dict headers: a map of any additional headers the broker requires
    :param keyword_headers: any additional headers the broker requires
    """
    assert destination is not None, "'destination' is required"
    assert body is not None, "'body' is required"
    headers = utils.merge_headers([headers, keyword_headers])
    headers[HDR_DESTINATION] = destination
    if content_type:
        headers[HDR_CONTENT_TYPE] = content_type
    body = encode(body)
    if self.auto_content_length and body and HDR_CONTENT_LENGTH not in headers:
        headers[HDR_CONTENT_LENGTH] = len(body)
    self.send_frame(CMD_SEND, headers, body)

三个条件都为true则会填充content-length,而auto_content_length是在__init__方法中传入的，默认值为True，所以只需要在创建对象的时候将该值设置为False即可。

# 推送到队列queue
def send_to_queue(msg):
    conn = stomp.Connection10([('192.168.36.213', 61613)], auto_content_length=False)
    conn.connect('admin', 'admin', wait=True)
    conn.send(springBootMqQueue, msg)
    conn.disconnect()