这是哪个包里面的
import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ByteArrayEntity;
import org.apache.http.params.CoreConnectionPNames;
import org.apache.http.util.EntityUtils;


[解决办法]
应该是 Apache 项目下的 HttpClient 包：
http://hc.apache.org/httpclient-3.x/

主要用来模拟浏览器用HTTP协议访问服务器。