android客户端与服务端交互的工具类

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public class HttpUtil {
	
	//创建HttpClient对象
	public static HttpClient httpClient = new DefaultHttpClient();
	public static final String BASE_URL="http://xxx.xxxx.xx.xx:8080/ticket/";
//	public static final String BASE_URL="http://xxx.xxxx.xx.xx:8080/apk/";
//	public static final String BASE_URL = "www.baidu.com";
	/**
	 * 
	 * @param url 发送请求的Url
	 * @return 服务器响应的字符串
	 * @throws Exception 
	 * @throws InterruptedException 
	 */
	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 response = httpClient.execute(get);
					//若是服务器响应成功
					if(response.getStatusLine().
							getStatusCode() == 200) {
						//获取服务器响应的字符串
						String result = EntityUtils.
								toString(response.getEntity());
						return result;
					}
					return null;
				}
			}
		);
		new Thread(task).start();
		return task.get();
	}
	
	/**
	 * 
	 * @param url 发送请求的url
	 * @param rawParams 请求参数
	 * @return 响应的字符串
	 * @throws Exception
	 */
	public static String postRequest(final String url,final Map<String,String> rawParams) throws Exception {
//		ExecutorService exec=Executors.newCachedThreadPool(); 
//		FutureTask<String> task = new FutureTask<String>(
//			new Callable<String>() {

//				@Override
//				public String call() throws Exception {
					//创建HttpPost对象
					HttpPost post = new HttpPost(new URI(url));
					//对较多的传递参数进行封装、
					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,HTTP.UTF_8));
					//发送post请求
					HttpResponse response = httpClient.execute(post);
					//若是服务器响应成功
					if(response.getStatusLine().getStatusCode() == HttpStatus.SC_OK){
						//获取服务器响应的字符串  
						String result = EntityUtils.toString(response.getEntity(),HTTP.UTF_8);
						return result;
					}else{
						return "-1";
					}
					
				}
//			}
//		);
//		new Thread(task).start();
//		return task.get();
//	}
	
	
}

public void service(HttpServletRequest request,HttpServletResponse response)
			throws ServletException,IOException {
		String uri = request.getRequestURI();
		uri = uri.substring(uri.lastIndexOf("/"));
		System.out.println("uri: " + uri);
		if("/hotStation.do".equals(uri)) {
			doHotStationList(request,response);
		}
		if("/stationList.do".equals(uri)) {
			doStationList(request,response);
		}
	}

public void doHotStationList(HttpServletRequest request,IOException {
		response.setCharacterEncoding("utf-8");
		response.setContentType("text/html;charset=UTF-8");
		List<String> hotStationList = StationService.getHostStationList();
		JSONArray jsonArray = JSONArray.fromObject(hotStationList);
		System.out.println("传给客户端:" + jsonArray.toString());
		response.getWriter().println(jsonArray.toString());
	}

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