Apache HttpClient

  采用Apache HttpClient与远程服务器通信。为了简化HttpClient的用法，定义了一个工具类对HttpClient进行封装该工具类定义了如下两个方法来发送请求

  getRequest():发送Get请求

  postRequest():发送post请求

package org.crazyit.auction.client.util;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.Callable;
import java.util.concurrent.FutureTask;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
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;

public class HttpUtil
{
	// 创建HttpClient对象
	public static HttpClient httpClient = new DefaultHttpClient();
	public static final String BASE_URL =
		"http://192.168.1.88:8888/auction/android/";
	/**
	 *
	 * @param url 发送请求的URL
	 * @return 服务器响应字符串
	 * @throws Exception
	 */
	public static String getRequest(final String url)
		throws Exception
	{
		FutureTask<String> task = new FutureTask<String>(
		new Callable<String>()
		{
			@Override
			public String call() throws Exception
			{
				// 创建HttpGet对象。
				HttpGet get = new HttpGet(url);
				// 发送GET请求
				HttpResponse httpResponse = httpClient.execute(get);
				// 如果服务器成功地返回响应
				if (httpResponse.getStatusLine()
					.getStatusCode() == 200)
				{
					// 获取服务器响应字符串
					String result = EntityUtils
						.toString(httpResponse.getEntity());
					return result;
				}
				return null;
			}
		});
		new Thread(task).start();
		return task.get();
	}

	/**
	 * @param url 发送请求的URL
	 * @param params 请求参数
	 * @return 服务器响应字符串
	 * @throws Exception
	 */
	public static String postRequest(final String url
		, final Map<String ,String> rawParams)throws Exception
	{
		FutureTask<String> task = new FutureTask<String>(
		new Callable<String>()
		{
			@Override
			public String call() throws Exception
			{
				// 创建HttpPost对象。
				HttpPost post = new HttpPost(url);
				// 如果传递参数个数比较多的话可以对传递的参数进行封装
				List<NameValuePair> params = 
					new ArrayList<NameValuePair>();
				
				for(String key : rawParams.keySet())
				{
					//封装请求参数
					params.add(new BasicNameValuePair(key 
						, rawParams.get(key)));
				}
				// 设置请求参数
				post.setEntity(new UrlEncodedFormEntity(
					params, "gbk"));
				// 发送POST请求
				HttpResponse httpResponse = httpClient.execute(post);
				// 如果服务器成功地返回响应
				if (httpResponse.getStatusLine()
					.getStatusCode() == 200)
				{
					// 获取服务器响应字符串
					String result = EntityUtils
						.toString(httpResponse.getEntity());
					return result;
				}
				return null;
			}
		});
		new Thread(task).start();
		return task.get();
	}
}

</pre><pre name="code" class="java">

补充说明：

<span style="white-space:pre">	<span style="font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 14px; line-height: 28px; text-align: center;">Java并发编程：Callable、Future和FutureTask</span></span>

<span style="white-space:pre"><span style="font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 14px; line-height: 28px; text-align: center;"><span style="white-space:pre">	</span> 请查看<span style="font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 14px; line-height: 28px;">http://www.cnblogs.com/dolphin0520/p/3949310.html</span></span></span>