为 Hangouts Chat API 和 Java 设置传入网络钩子？

Question

我按照此处的示例 (Incoming webhook with Python) 向环聊聊天室发送了一条简单的消息并按预期工作

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()

现在我想使用 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());
}

但这会导致一条错误消息说

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

我假设我添加 json 对象的方式有问题。有人看到错误了吗？

Answer 1

有点转储，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());
}

顺序有时很重要:)

为 Hangouts Chat API 和 Java 设置传入网络钩子？

Setting up an incoming webhook for Hangouts Chat API with Java?

java

hangouts-chat