客户端：

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();  // }        }  

注意：连接本地服务器时，最好使用ipv4地址而不是localhost。

服务端：

写一个servlet接收，判断客户端发送的是什么请求uri

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);    }   }

如doHotStationList是这样写的：

public void doHotStationList(HttpServletRequest request, HttpServletResponse response)     throws ServletException, 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());   }

我这里数据交互使用的是json.

客户端获取服务端传递过来的json数据再解析成pojo对象即可。