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>