android客户端与服务端交互的工具类，android工具类,客户端： public

android客户端与服务端交互的工具类，android工具类,客户端： public

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。