httpclient重定向之后获取网址信息示例

复制代码 代码如下:
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 {

 
 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();
  }
 }
}