//使用HttpClient请求服务器将用户密码发送服务器验证

               try{

                String path = "http://192.168.13.83:8080/xuexi/servlet/LoginServlet?username="+URLEncoder.encode(username,"utf-8")+"&pwd="+URLEncoder.encode(password,"utf-8");

                //1.创建一个httpClient对象

                HttpClient httpclient = new DefaultHttpClient();

                //2.设置请求的方式

                HttpGet httpget = new HttpGet(path);

                //3.执行一个http请求

                HttpResponse response = httpclient.execute(httpget);

                //4.获取请求的状态码，

                StatusLine statusLine = response.getStatusLine();

                int code = statusLine.getStatusCode();

                //5.判断状态码后获取内容

                if(code == 200){

                    HttpEntity entity = response.getEntity();//获取实体内容，中封装的有http请求返回的流信息

                    InputStream inputStream = entity.getContent();

                    //将流信息转换成字符串

                    String result = StreamUtils.streamToString(inputStream);

                    Message msg = Message.obtain();

                    msg.what = 1;

                    msg.obj = result;

                    handler.sendMessage(msg);

                }

               }catch (Exception e) {

                    e.printStackTrace();

               }

 //使用UrlConncetion请求服务器将用户密码发送服务器验证

               　　try{

                        String path = "http://192.168.13.83:8080/xuexi/servlet/LoginServlet";

                        //1.创建一个httpclient对象

                        HttpClient httpclient = new DefaultHttpClient();

                        //2.创建一个请求方式

                        HttpPost httppost = new HttpPost(path);

                        //创建集合封装数据

                        ArrayList<BasicNameValuePair> arrayList = new ArrayList<BasicNameValuePair>();

                        BasicNameValuePair nameValuePair = new BasicNameValuePair("username",username);

                        arrayList.add(nameValuePair);

                        BasicNameValuePair nameValuePair1 = new BasicNameValuePair("pwd",password);

                        arrayList.add(nameValuePair1);

                        //创建一个Entity

                        UrlEncodedFormEntity entity = new UrlEncodedFormEntity(arrayList, "utf-8");

                        //设置请求时的内容

                        httppost.setEntity(entity);

                        //3.执行一个请求,返回一个response对象

                        HttpResponse response = httpclient.execute(httppost);

                        //4.获取状态码

                        int code = response.getStatusLine().getStatusCode();

                        //5.判断并获取内容

                        if(code == 200){

                            HttpEntity entity1 = response.getEntity();//获取实体内容，中封装的有http请求返回的流信息

                            InputStream inputStream = entity1.getContent();

                            //将流信息转换成字符串

                            String result = StreamUtils.streamToString(inputStream);

                            Message msg = Message.obtain();

                            msg.what = 2;

                            msg.obj = result;

                            handler.sendMessage(msg);

                        }

                }catch (Exception e) {

                    e.printStackTrace();

                }