使用Java为Hangouts Chat API设置传入的webhook?

时间:2018-06-10 17:50:31

标签: java hangouts-chat

我按照此处的示例(Incoming webhook with Python),将简单消息发送到环聊聊天室并按预期工作

from httplib2 import Http
from json import dumps

def main():
    url = 'https://chat.googleapis.com/v1/spaces/AAAAUfABqBU/messages?key=<WEBHOCK-KEY>'
    bot_message = {
        'text' : 'Hello from Python script!'}

    message_headers = { 'Content-Type': 'application/json; charset=UTF-8'}

    http_obj = Http()

    response = http_obj.request(
        uri=url,
        method='POST',
        headers=message_headers,
        body=dumps(bot_message),
    )

    print(response)

if __name__ == '__main__':
    main()

现在我希望使用Java实现同样简单的事情,并尝试使用此代码

private void sendPost() throws IOException {

    String url = "https://chat.googleapis.com/v1/spaces/AAAAUfABqBU/messages?key=<WEBHOCK-KEY>";

    final HttpClient client = new DefaultHttpClient();
    final HttpPost request = new HttpPost(url);
    final HttpResponse response = client.execute(request);

    request.addHeader("Content-Type", "application/json; charset=UTF-8");

    final StringEntity params = new StringEntity("{\"text\":\"Hello from Java!\"}", ContentType.APPLICATION_FORM_URLENCODED);
    request.setEntity(params);

    final BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));

    StringBuffer result = new StringBuffer();
    String line;
    while ((line = rd.readLine()) != null) {
        result.append(line);
    }

    System.out.println(result.toString());
}

但这会导致错误信息

 {
    "error": {
        "code": 400,
        "message": "Message cannot be empty. Discarding empty create message request in spaces/AAAAUfABqBU.",
        "status": "INVALID_ARGUMENT"
    }
}

我认为添加json对象的方式有问题。有人看到了这个错误吗?

1 个答案:

答案 0 :(得分:0)

转储类型,但在设置请求正文后移动行final HttpResponse response = client.execute(request);解决了问题。

private void sendPost() throws IOException {

    String url = "https://chat.googleapis.com/v1/spaces/AAAAUfABqBU/messages?key=<WEBHOCK-KEY>";

    final HttpClient client = new DefaultHttpClient();
    final HttpPost request = new HttpPost(url);
    // FROM HERE

    request.addHeader("Content-Type", "application/json; charset=UTF-8");

    final StringEntity params = new StringEntity("{\"text\":\"Hello from Java!\"}", ContentType.APPLICATION_FORM_URLENCODED);
    request.setEntity(params);

    // TO HERE
    final HttpResponse response = client.execute(request);

    final BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));

    StringBuffer result = new StringBuffer();
    String line;
    while ((line = rd.readLine()) != null) {
        result.append(line);
    }

    System.out.println(result.toString());
}

订单有时很重要:)