Apache HttpClient - 中止请求

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您可以使用abort()方法中止当前的 HTTP 请求，即调用该方法后，对于特定请求，将中止该请求的执行。

如果在一次执行后调用该方法，则不会影响该次执行的响应，并且会中止后续执行。

例子

如果您观察以下示例，我们已经创建了一个 HttpGet 请求，并使用getMethod()打印了使用的请求格式。

然后，我们使用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，打印第一次执行（在 abort 方法之前执行）的响应（包括在 abort 方法之后写入的第二个状态行），并且在 abort 方法之后当前请求的所有后续执行都会失败，^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("https://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

执行时，上述程序生成以下输出 -

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)