HttpClient 是 Apache Jakarta Common 下的子项目，可以用来提供高效的、最新的、功能丰富的支持 HTTP 协议的客户端编程工具包，并且它支持 HTTP 协议最新的版本和建议。 如下面java程序，为我写的一个简单的httpclient的测试程序：
package crawlerTest; import java.io.IOException; import org.apache.http.HttpResponse; import org.apache.http.HttpStatus; import org.apache.http.HttpVersion; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.message.BasicHttpResponse; import org.apache.http.util.EntityUtils; public class httpTest { public static void main(String[] args) throws IOException { HttpClient client = new DefaultHttpClient(); //初始化httpclient String personalUrl="http://www.autohome.com.cn/beijing/"; //指定一个种子url HttpGet postMethod = new HttpGet(personalUrl); //post方法请求 System.out.println("postMethod====="+ postMethod+"====="); HttpGet getMethod = new HttpGet(personalUrl); // get方法请求 System.out.println("Method======"+getMethod+"====="); HttpResponse response = new BasicHttpResponse(HttpVersion.HTTP_1_1, HttpStatus.SC_OK, "OK"); //初始化response response = client.execute(getMethod); //执行响应 System.out.println("response========"+response+"====="); int StatusCode = response.getStatusLine().getStatusCode(); //获取响应状态码 System.out.println("StatusCode===="+StatusCode+"====="); System.out.println(response); if(StatusCode == 200){ //状态码200表示响应成功 //获取实体内容 String entity = EntityUtils.toString (response.getEntity(),"utf-8"); //输出实体内容 System.out.println(entity); EntityUtils.consume(response.getEntity()); //消耗实体 }else { //关闭HttpEntity的流实体 EntityUtils.consume(response.getEntity()); //消耗实体 } } }