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📜  Apache HttpClient-中止请求

📅  最后修改于: 2020-11-18 08:28:11             🧑  作者: Mango

您可以使用abort()方法中止当前的HTTP请求，即，在调用此方法之后，对特定请求，将中止执行。

如果在执行一次后调用此方法，则该执行的响应将不受影响，并且后续执行将中止。

例

如果您观察以下示例，则我们创建了一个HttpGet请求，并使用getMethod()打印使用的请求格式。

然后，我们对相同的请求执行了另一次执行。再次使用第一次执行打印状态行。最后，打印第二次执行的状态行。

如前所述，将打印第一个执行(在中止方法之前执行)的响应(包括在中止方法之后写入的第二个状态行)，并且中止方法之后当前请求的所有后续执行都将失败，调用例外。

import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;

public class HttpGetExample {
   public static void main(String args[]) throws Exception{
   
      //Creating an HttpClient object
      CloseableHttpClient httpclient = HttpClients.createDefault();

      //Creating an HttpGet object
      HttpGet httpget = new HttpGet("http://www.tutorialspoint.com/");

      //Printing the method used
      System.out.println(httpget.getMethod());
 
      //Executing the Get request
      HttpResponse httpresponse = httpclient.execute(httpget);

      //Printing the status line
      System.out.println(httpresponse.getStatusLine());

      httpget.abort();
      System.out.println(httpresponse.getEntity().getContentLength());
 
      //Executing the Get request
      HttpResponse httpresponse2 = httpclient.execute(httpget);
      System.out.println(httpresponse2.getStatusLine());
   }
}

输出

在执行时，以上程序生成以下输出-

On executing, the above program generates the following output.
GET
HTTP/1.1 200 OK
-1
Exception in thread "main" org.apache.http.impl.execchain.RequestAbortedException:
Request aborted
at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:180)
at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:185)
at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:108)
at HttpGetExample.main(HttpGetExample.java:32)