如何在整个Android原生应用程序中维护服务器登录？

Question

让我来描述我的应用程序,我从网站JSON url(Drupal网站)获取数据,数据是JSON格式.在我的应用程序登录功能完美.&user在服务器上验证.我也从服务器获取其他数据(JSON url)并在我的android应用程序中显示. 现在,问题是我无法访问需要登录的页面的JSON数据,因为我的登录不是在整个Android应用程序中维护.

我搜索了stackoverflow和谷歌我得到了这些链接并试过但不知道如何在我的代码中使用它们:http: //hc.apache.org/httpcomponents-client-ga/tutorial/html/statemgmt.html

Android会话管理

Android中的Http cookie商店

这是来自drupal站点而没有登录的Empty JSON.

{
    "nodes": []
}

这是来自drupal 站点的JSON- 登录后(http://www.mywebsite.com/user/login)并在网站上重新加载页面http://www.mywebsite.com/myaccount-page - 在计算机webbrowser中.表示计算机Web浏览器自动维护登录会话.

{
"nodes": [
    {
        "node": {
            "Uid": "51",
            "Username": "anand",
            "Name": "anand",
            "Address": "\n\tAt- vadodara Nr. Kareli Baugh",
            "Date of Birth": "1998-08-20",
            "Occupation": "student",
            "Member Since": "36 weeks 6 days"
        }
    }
 ]
}

但在Android应用程序中它不会自动执行此操作. 所以我想在Android中维护这个会话,这样我就可以登录android应用程序,登录后重定向到另一个页面活动并在那里获取JSON数据. 这是我的代码:

LoginActivity.java

     public void onClick(View v) {


            String uName = editUser.getText().toString();
            String Password = editPass.getText().toString();

            if(uName.equals("") | Password.equals(""))
            {
                Toast.makeText(getApplicationContext(), "Enter the Username and Password",Toast.LENGTH_SHORT).show();
            }
            else{


                                     String strResponse = util.makeWebCall(loginURL,uName,Password);
                 System.out.println("=========> Response from login page=> " + strResponse);


                try{
                    if (strResponse.substring(KEY_SUCCESS) != null) {
                        txterror.setText("");



                         Intent inlogin = new Intent(LoginActivity.this,
                                post_myprofile.class);
                        inlogin.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                        startActivity(inlogin);

                        //finish();
                    }
                    else
                    {
                        txterror.setText("Username and Password Not valid !!!");
                    }
                }
                catch (Exception e) {
                    // TODO: handle exception
                }





            }


        }
    });

    btngotoregister.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {

            Intent intent1 = new Intent(getApplicationContext(),
                    RegisterActivity.class);
            // intent.setFlags (Intent.FLAG_ACTIVITY_CLEAR_TOP);
            startActivity(intent1);

        }
    });
 }
 }

util.java中的makeWebCall方法

util.java

 public static String makeWebCall(String url, String uname,String pass)
{
    DefaultHttpClient client = new DefaultHttpClient();

    HttpPost post = new HttpPost(url);

     List<NameValuePair> params = new ArrayList<NameValuePair>();

     params.add(new BasicNameValuePair("username",uname));
        params.add(new BasicNameValuePair("password",pass));

    UrlEncodedFormEntity formEntity = null;
    try {
        formEntity = new UrlEncodedFormEntity(params);
    } catch (UnsupportedEncodingException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    }

    post.setEntity(formEntity);

    try {
        //post.setEntity(new StringEntity(requestString));

        HttpResponse response = client.execute(post);
        System.out.println("=========> Responsehello => "+response);
        int statusCode = response.getStatusLine().getStatusCode();

        if (statusCode == HttpStatus.SC_OK)
        {
            HttpEntity entity = response.getEntity();
            InputStream is = entity.getContent();
            return iStream_to_String(is);
        }
        else
        {
            return "Hello This is status ==> :"+String.valueOf(statusCode);
        }
    } catch (UnsupportedEncodingException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (ClientProtocolException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    return null;
}

现在使用此代码登录成功并且我从服务器获得了详细的JSON响应.&page-activity重定向到用户个人资料的第2页.在第二页,我没有得到userprofile JSON数据 - 如上所述,我得到空白JSON,因为没有维护会话.

这是第二页活动的代码.

post_myprofile.java

protected Void doInBackground(Void... params) {
        // TODO Auto-generated method stub

        String url = "http://www.cheerfoolz.com/myaccount-page";
        String strResponse = util.makeWebCall(url);

        try {
            JSONObject objResponse = new JSONObject(strResponse);

            JSONArray jsonnodes = objResponse
                        .getJSONArray(API.cheerfoolz_myprofile.NODES);

util.java中的配置文件的makewebcall方法

util.java

 public static String makeWebCall(String url) {

    DefaultHttpClient client = new DefaultHttpClient();

    HttpGet httpRequest = new HttpGet(url);
  //  HttpPost post = new HttpPost(url);

    try {

        HttpResponse httpResponse = client.execute(httpRequest);

         final int statusCode = httpResponse.getStatusLine().getStatusCode();

         if (statusCode != HttpStatus.SC_OK) {
          /*  Log.i(getClass().getSimpleName(),
                "Error => " + statusCode + " => for URL " + url);*/
            return null;
         }

         HttpEntity entity = httpResponse.getEntity();
            InputStream is = entity.getContent();
            return iStream_to_String(is);
    }
    catch (IOException e) {
        httpRequest.abort();
      // Log.w(getClass().getSimpleName(), "Error for URL =>" + url, e);
    }

    return null;

 }


public static String iStream_to_String(InputStream is1)
{
     BufferedReader rd = new BufferedReader(new InputStreamReader(is1), 4096);
     String line;
     StringBuilder sb =  new StringBuilder();
     try {
        while ((line = rd.readLine()) != null) {
                sb.append(line);
         }
         rd.close();

    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
     String contentOfMyInputStream = sb.toString();
     return contentOfMyInputStream;
}


}

我在这个页面中得到了空白的JSON - 我上面提到过.那么如何在此用户配置文件活动中维护会话并获取数据？

谢谢收听.

Answer 1

终于对我有用了:)

我没有一直使用新的DefaultHttpClient ，而是将其设为静态并仅使用一次。

static DefaultHttpClient client = new DefaultHttpClient();