HttpClient 学习

package http.demo; 
import java.io.IOException; 
import org.apache.commons.httpclient.*; 
import org.apache.commons.httpclient.methods.*;
/** 
 *最简单的HTTP客户端,用来演示通过GET或者POST方式访问某个页面
  *@author
*/
public class SimpleClient {
public static void main(String[] args) throws IOException 
{
  HttpClient client = new HttpClient(); 
      // 设置代理服务器地址和端口      
      //client.getHostConfiguration().setProxy("proxy_host_addr",proxy_port); 
      // 使用 GET 方法 ，如果服务器需要通过 HTTPS 连接，那只需要将下面 URL 中的 http 换成 https 
         HttpMethodmethod=newGetMethod("http://java.sun.com");
      //使用POST方法
      //HttpMethod method = new PostMethod("http://java.sun.com");
      client.executeMethod(method);

      //打印服务器返回的状态
       System.out.println(method.getStatusLine());
      //打印返回的信息
      System.out.println(method.getResponseBodyAsString());
      //释放连接
      method.releaseConnection();
   }
}

package http.demo; 
import org.apache.commons.httpclient.*;
import org.apache.commons.httpclient.cookie.*;
import org.apache.commons.httpclient.methods.*; 

/** 
 * 用来演示登录表单的示例 
 * @author
 */
public class FormLoginDemo {
   static final String LOGON_SITE = "localhost" ;
   static final int     LOGON_PORT = 8080;

   public static void main(String[] args) throws Exception{
      HttpClient client = new HttpClient();
      client.getHostConfiguration().setHost(LOGON_SITE, LOGON_PORT);

      // 模拟登录页面 login.jsp->main.jsp
      PostMethod post = new PostMethod( "/main.jsp" );
      NameValuePair name = new NameValuePair( "name" , "ld" );
      NameValuePair pass = new NameValuePair( "password" , "ld" );
      post.setRequestBody( new NameValuePair[]{name,pass});
      int status = client.executeMethod(post);
      System.out.println(post.getResponseBodyAsString());
      post.releaseConnection();

      // 查看 cookie 信息
      CookieSpec cookiespec = CookiePolicy.getDefaultSpec();
      Cookie[] cookies = cookiespec.match(LOGON_SITE, LOGON_PORT, "/" , false , client.getState().getCookies());
      if (cookies.length == 0) {
         System.out.println( "None" );
      } else {
         for ( int i = 0; i < cookies.length; i++) {
            System.out.println(cookies[i].toString());
         }
      }

      // 访问所需的页面 main2.jsp 
      GetMethodget=newGetMethod("/main2.jsp");
      client.executeMethod(get);
      System.out.println(get.getResponseBodyAsString());
      get.releaseConnection();
   }
}