[英]How to send HttpPost every 5 secs
在Java中,我想每5秒发送HttpPost而不等待响应。 我怎样才能做到这一点?
我使用以下代码:
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。
即使我丢失了先前的连接并建立了新的连接以发送第二个连接,第二个execute函数也始终被阻止。
您的问题留下了很多问题,但是可以通过以下方法实现基本要点:
while(true){ //process executes infinitely. Replace with your own condition
Thread.sleep(5000); // wait five seconds
httpClient.execute(post); //execute your request
}
我尝试了您的代码,但出现了异常:java.lang.IllegalStateException:BasicClientConnManager的无效使用:连接仍然被分配。 在分配另一个之前,请确保释放连接。
此异常已在HttpClient 4.0.1中记录-如何释放连接?
我可以通过使用以下代码使用响应来释放连接:
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,这意味着程序等待响应被阻止。 取而代之的是,您可以使用async-http-client库执行异步请求(如果您不熟悉Maven,则可以从search.maven.org下载jar文件)。 示例代码可能如下所示:
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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