该篇文章主要说明使用Apache提供的HTTPClient,通过post方式,向服务器发送数据.由于有些东西在 中提到过,就不再重复.

一,Android客户端的业务逻辑层:

package spt.http.post;import java.io.IOException;import java.net.MalformedURLException;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import java.util.Map.Entry;import org.apache.http.HttpResponse;import org.apache.http.client.entity.UrlEncodedFormEntity;import org.apache.http.client.methods.HttpPost;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.message.BasicNameValuePair;import android.os.Handler;import android.util.Log;/** * 用户向服务器端发送数据的类(使用post)方法. *  * @author Administrator *  */public class PostSender {	// 连接服务器的url.	private static final String URL = "http://192.168.1.101:8080/ReceiveAndroid/ServletForPostMethod";	// 标识是否连接到服务器成功.	public static final int SEND_SUCCESS = 1;	public static final int SEND_FAIL = 0;	private Handler handler = null;	//新线程关联的Handler,用于将是否发送成功的标识Message放到消息队列中.	public PostSender(Handler handler) {		this.handler = handler;	}	/**	 * 往服务器发送数据.	 * 	 * @param name	 * @param pwd	 */	public void send(String name, String pwd) {		// 这里params要传递到另外一个方法,加final为了防止被修改.		final Map
     
       params = new HashMap
      
       ();		params.put("name", name);		params.put("pwd", pwd);		// 启动新的线程连接服务器.		new Thread(new Runnable() {			@Override			public void run() {				// 请求连接.				try {					if (postSend(params, URL, "utf-8"))						handler.sendEmptyMessage(SEND_SUCCESS);					else						handler.sendEmptyMessage(SEND_FAIL);				} catch (MalformedURLException e) {					Log.d("sysout", "run:MalformedURLException" + e.getMessage());				} catch (IOException e) {					Log.d("sysout", "run:IOException" + e.getMessage());				}			}		}).start();	}	/**	 * 发送post请求的方法.	 * 	 * @param params	 *            请求参数的键-值对.	 * @param url	 * @param encoding	 *            使用指定编码对参数值进行编码.	 * @return	 * @throws MalformedURLException	 * @throws IOException	 */	private boolean postSend(Map
       
         params, String url,			String encoding) throws MalformedURLException, IOException {		// 封装请求参数的键值对.		List
        
          pairs = new ArrayList
         
          ();		for (Entry
          
            param : params.entrySet()) { pairs.add(new BasicNameValuePair(param.getKey(), param.getValue())); } //封装请求参数的实体. UrlEncodedFormEntity entity = new UrlEncodedFormEntity(pairs, encoding); //使用post请求. HttpPost post = new HttpPost(url); post.setEntity(entity); //使用DefaultHttpClient指定请求,以获取响应信息. DefaultHttpClient client = new DefaultHttpClient(); HttpResponse response = client.execute(post); return response.getStatusLine().getStatusCode() == 200; // 等于200表示发送成功. }}
          
         
        
       
      
     

 二,服务器端的Servlet,重写doPost方法:

package spt.servlet;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;@WebServlet("/ServletForPostMethod")public class ServletForPostMethod extends HttpServlet{	/**	 * 	 */	private static final long serialVersionUID = 1L;	@Override	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {		System.out.println("enter...post");		String name = req.getParameter("name");		String pwd = req.getParameter("pwd");		System.out.println("name=" + name);		System.out.println("pwd=" + pwd);	}		@Override	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {//		System.out.println("enter...get");//		String name = req.getParameter("name");//		String pwd = req.getParameter("pwd");//		System.out.println("name=" + name);//		System.out.println("pwd=" + pwd);	}}

 另外,途中,我连几个小时的Tomcat服务器,后来通过log过滤,发现自己的问题,所以建议多使用log捕获异常信息.我在网上看到有位网友,使用HTTP进行post连接的时候,对url的处理和get一样,都是将参数拼接在原有url的后面,我觉得很奇怪.