get方式:
            //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();
                }

    post方式：

            //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();
                }

httpclient方式提交数据到服务器