[英]How to send HttpPost every 5 secs
在Java中,我想每5秒發送HttpPost而不等待響應。 我怎樣才能做到這一點?
我使用以下代碼:
HttpClient httpClient = new DefaultHttpClient();
HttpPost post = new HttpPost(url);
StringEntity params = new StringEntity(json.toString() + "\n");
post.addHeader("content-type", "application/json");
post.setEntity(params);
httpClient.execute(post);
Thread.sleep(5000);
httpClient.execute(post);
但它不起作用。
即使我丟失了先前的連接並建立了新的連接以發送第二個連接,第二個execute函數也始終被阻止。
您的問題留下了很多問題,但是可以通過以下方法實現基本要點:
while(true){ //process executes infinitely. Replace with your own condition
Thread.sleep(5000); // wait five seconds
httpClient.execute(post); //execute your request
}
我嘗試了您的代碼,但出現了異常:java.lang.IllegalStateException:BasicClientConnManager的無效使用:連接仍然被分配。 在分配另一個之前,請確保釋放連接。
此異常已在HttpClient 4.0.1中記錄-如何釋放連接?
我可以通過使用以下代碼使用響應來釋放連接:
public void sendMultipleRequests() throws ClientProtocolException, IOException, InterruptedException {
HttpClient httpClient = new DefaultHttpClient();
HttpPost post = new HttpPost("http://www.google.com");
HttpResponse response = httpClient.execute(post);
HttpEntity entity = response.getEntity();
EntityUtils.consume(entity);
Thread.sleep(5000);
response = httpClient.execute(post);
entity = response.getEntity();
EntityUtils.consume(entity);
}
使用DefaultHttpClient是同步的,這意味着程序等待響應被阻止。 取而代之的是,您可以使用async-http-client庫執行異步請求(如果您不熟悉Maven,則可以從search.maven.org下載jar文件)。 示例代碼可能如下所示:
import com.ning.http.client.*; //imports
try {
AsyncHttpClient asyncHttpClient = new AsyncHttpClient();
while(true) {
asyncHttpClient
.preparePost("http://your.url/")
.addParameter("postVariableName", "postVariableValue")
.execute(); // just execute request and ignore response
System.out.println("Request sent");
Thread.sleep(5000);
}
} catch (Exception e) {
System.out.println("oops..." + e);
}
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