httpclient 表单请求

package com.jadyer.util;   
import java.io.IOException;   
    import java.io.UnsupportedEncodingException;   
    import java.util.ArrayList;   
    import java.util.List;   
      
    import org.apache.http.HttpEntity;   
    import org.apache.http.HttpResponse;   
    import org.apache.http.NameValuePair;   
    import org.apache.http.ParseException;   
    import org.apache.http.client.ClientProtocolException;   
    import org.apache.http.client.HttpClient;   
    import org.apache.http.client.entity.UrlEncodedFormEntity;   
    import org.apache.http.client.methods.HttpGet;   
    import org.apache.http.client.methods.HttpPost;   
    import org.apache.http.impl.client.DefaultHttpClient;   
    import org.apache.http.message.BasicNameValuePair;   
    import org.apache.http.util.EntityUtils;   
      
    /**  
     * 使用HttpClient模拟HTTP访问  
     * @see ===============================================================================================================================  
     * @see HttpClient代表了一个HTTP客户端,HttpClient接口中定义了大多数基本的HTTP请求执行行为  
     * @see HttpEntity是发送或接收消息的载体,它可以通过HttpResponse.getEntity()获取到  
     * @see HttpConnection代表了一个HTTP连接  
     * @see ===============================================================================================================================  
     * @author http://blog.csdn.net/jadyer  
     * @editor Feb 1, 2012 3:02:27 PM  
     */  
    public class HttpClientUtil {