Apache HttpClient - 中止请求
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简述
您可以使用 abort() 方法中止当前的 HTTP 请求,即,在调用此方法后,在特定请求上,它的执行将被中止。如果在一次执行后调用该方法,则该执行的响应不受影响,后续执行将被中止。 -
示例
如果您观察以下示例,我们创建了一个 HttpGet 请求,使用 getMethod() 打印了使用的请求格式。然后,我们用相同的请求执行了另一次执行。再次使用 1st 执行打印状态行。最后,打印第二次执行的状态行。如前所述,第 1st 执行(在 abort 方法之前执行)的响应被打印(包括在 abort 方法之后写入的第二个状态行),并且所有后续执行的abort 方法后的当前请求调用异常失败。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.jc2182.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()); } }
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输出
在执行时,上面的程序生成以下输出 -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)