httpclient response 重定向

HTTPClient請求后，重定向后，獲取重定向的URL。

 

方法一：重定向后獲取URL

 

import org.apache.http.HttpEntity;

import org.apache.http.HttpHost;

import org.apache.http.HttpResponse;

import org.apache.http.client.HttpClient;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.client.methods.HttpUriRequest;

import org.apache.http.entity.ContentType;

import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.http.protocol.BasicHttpContext;

import org.apache.http.protocol.ExecutionContext;

import org.apache.http.protocol.HttpContext;

import org.apache.http.util.EntityUtils;

 

public class HttpClientDemo {

 

     /**

      * 獲取重定向之后的網址信息

      * @see HttpClient缺省會自動處理客戶端重定向

      * @see 即訪問網頁A后,假設被重定向到了B網頁,那么HttpClient將自動返回B網頁的內容

      * @see 若想取得B網頁的地址,就需要借助HttpContext對象,HttpContext實際上是客戶端用來在多次請求響應的交互中,保持狀態信息的

      * @see 我們自己也可以利用HttpContext來存放一些我們需要的信息,以便下次請求的時候能夠取出這些信息來使用

      */

     public static void getRedirectInfo(){

         HttpClient httpClient = new DefaultHttpClient();

         HttpContext httpContext = new BasicHttpContext();

         HttpGet httpGet = new HttpGet( "http://127.0.0.1:8088/blog/main.jsp" );

         try {

             //將HttpContext對象作為參數傳給execute()方法,則HttpClient會把請求響應交互過程中的狀態信息存儲在HttpContext中

             HttpResponse response = httpClient.execute(httpGet, httpContext);

             //獲取重定向之后的主機地址信息,即"http://127.0.0.1:8088"

             HttpHost targetHost = (HttpHost)httpContext.getAttribute(ExecutionContext.HTTP_TARGET_HOST);

             //獲取實際的請求對象的URI,即重定向之后的"/blog/admin/login.jsp"

             HttpUriRequest realRequest = (HttpUriRequest)httpContext.getAttribute(ExecutionContext.HTTP_REQUEST);

             System.out.println( "主機地址:" + targetHost);

             System.out.println( "URI信息:" + realRequest.getURI());

             HttpEntity entity = response.getEntity();

             if ( null != entity){

                 System.out.println( "響應內容:" + EntityUtils.toString(entity, ContentType.getOrDefault(entity).getCharset()));

                 EntityUtils.consume(entity);

             }

         } catch (Exception e) {

             e.printStackTrace();

         } finally {

             httpClient.getConnectionManager().shutdown();

         }

     }

}

 

方法二：禁止重定向：

 

HttpParams params = new BasicHttpParams();
params.setParameter("http.protocol.handle-redirects", false); // 默認不讓重定向
post.setParams(params);