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 {

/**

* 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();

}

}

}