HttpClient获取重定向之后的网址信息

转自：http://blog.csdn.net/jadyer/article/details/8656019

[java] view plain copyprint?    package com.jadyer.httpclient;            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 {          /**          * 获取重定向之后的网址信息          * @see HttpClient缺省会自动处理客户端重定向          * @see 即访问网页A后,假设被重定向到了B网页,那么HttpClient将自动返回B网页的内容          * @see 若想取得B网页的地址,就需要借助HttpContext对象,HttpContext实际上是客户端用来在多次请求响应的交互中,保持状态信息的          * @see 我们自己也可以利用HttpContext来存放一些我们需要的信息,以便下次请求的时候能够取出这些信息来使用          */          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 {                  //将HttpContext对象作为参数传给execute()方法,则HttpClient会把请求响应交互过程中的状态信息存储在HttpContext中                  HttpResponse response = httpClient.execute(httpGet, httpContext);                  //获取重定向之后的主机地址信息,即"http://127.0.0.1:8088"                  HttpHost targetHost = (HttpHost)httpContext.getAttribute(ExecutionContext.HTTP_TARGET_HOST);                  //获取实际的请求对象的URI,即重定向之后的"/blog/admin/login.jsp"                  HttpUriRequest realRequest = (HttpUriRequest)httpContext.getAttribute(ExecutionContext.HTTP_REQUEST);                  System.out.println("主机地址:" + targetHost);                  System.out.println("URI信息:" + realRequest.getURI());                  HttpEntity entity = response.getEntity();                  if(null != entity){                      System.out.println("响应内容:" + EntityUtils.toString(entity, ContentType.getOrDefault(entity).getCharset()));                      EntityUtils.consume(entity);                  }              } catch (Exception e) {                  e.printStackTrace();              }finally{                  httpClient.getConnectionManager().shutdown();              }          }      }