Web后台和Android前端之间的网络通信

一、通过GET方式去提交数据：

public void loginGet(View view){//例如：       String uname=et_main_uname.getText().toString();       String upass=et_main_upass.getText().toString();       String path="http://193.168.2.141:7788/demo/login.do";      new MyGetTask().execute(uname,upass,path);    }

class MyGetTask extends AsyncTask{        @Override        protected Object doInBackground(Object[] params) {            String uname=params[0].toString();            String upass=params[1].toString();            String path=params[2].toString();            try {                URL url=new URL(path+"?uname="+uname+"&upass="+upass);                HttpURLConnection connection= (HttpURLConnection) url.openConnection();                connection.setRequestMethod("GET");                connection.setConnectTimeout(5000);                if(connection.getResponseCode()==200){                    InputStream is=connection.getInputStream();                    BufferedReader br=new BufferedReader(new InputStreamReader(is));                    String s=br.readLine();                    return s;                }            } catch (MalformedURLException e) {                e.printStackTrace();            } catch (IOException e) {                e.printStackTrace();            }            return null;        }        @Override        protected void onPostExecute(Object o) {            super.onPostExecute(o);            String s= (String) o;            Toast.makeText(MainActivity.this, s, Toast.LENGTH_SHORT).show();        }    }

二、通过POST提交数据

public void loginPost(View view){       String uname=et_main_uname.getText().toString();       String upass=et_main_upass.getText().toString();       String path="http://193.168.2.141:7788/demo/login.do";      new MyPostTask().execute(uname,upass,path);    }

class MyPostTask extends AsyncTask{        @Override        protected Object doInBackground(Object[] params) {            String uname=params[0].toString();            String upass=params[1].toString();            String path=params[2].toString();            try {                URL url=new URL(path);                HttpURLConnection conn= (HttpURLConnection) url.openConnection();                conn.setRequestMethod("POST");                conn.setConnectTimeout(5000);                //admin 123                //uname=admin&upass=123456                String s="uname="+uname+"&upass="+upass;                 //添加请求头                conn.setRequestProperty("Content-Length",s.length()+"");                conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");//固定的写法                conn.setDoOutput(true);//允许对外输出数据                OutputStream os=conn.getOutputStream();                os.write(s.getBytes());                if(conn.getResponseCode()==200){                    InputStream is=conn.getInputStream();                    BufferedReader br=new BufferedReader(new InputStreamReader(is));                    String str=br.readLine();                    return str;                }            } catch (MalformedURLException e) {                e.printStackTrace();            } catch (IOException e) {                e.printStackTrace();            }            return null;        }        @Override        protected void onPostExecute(Object o) {            super.onPostExecute(o);            String s= (String) o;            Toast.makeText(MainActivity.this,s, Toast.LENGTH_SHORT).show();        }    }

三、使用第三方AsyncHttpClient提交数据

public void loginAsyncHttpClient(View view){        String uname=et_main_uname.getText().toString();        String upass=et_main_upass.getText().toString();        String path="http://193.168.2.141:7788/G160628_Server/login.do";        AsyncHttpClient ahc=new AsyncHttpClient();        RequestParams params=new RequestParams();        params.put("uname",uname);        params.put("upass",upass);        ahc.post(this,path,params,new TextHttpResponseHandler(){            @Override            public void onFailure(int statusCode, Header[] headers, String responseBody, Throwable error) {                super.onFailure(statusCode, headers, responseBody, error);            }            @Override            public void onSuccess(int statusCode, Header[] headers, String responseBody) {                super.onSuccess(statusCode, headers, responseBody);                Toast.makeText(MainActivity.this, responseBody, Toast.LENGTH_SHORT).show();            }        });    }

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