如何从android窗体向localhost URL发送请求？

Question

我想给Android的表单数据到特定的URL（如网页的login.php“这是我的网站，将来自DB表单数据的验证保存记录的页面”）

Answer 1

见本教程和你做

http://www.androidhive.info/2012/05/how-to-connect-android-with-php-mysql/

实际上，你需要两个类来完成这个 1.您的活动 2. JSON解析器

这里是他们两个人的示例代码，你可以修改它按照自己的需要

public class JSONParser { 

    static InputStream is = null; 
    static JSONObject jObj = null; 
    static String json = ""; 
    static JSONArray jArr = null; 

    // constructor 
    public JSONParser() { 

    } 

    // function get json from url 
    // by making HTTP POST or GET method 
    public JSONObject makeHttpRequest(String url, String method, 
      List<NameValuePair> params) { 

     // Making HTTP request 
     try { 

      // check for request method 
      if(method == "POST"){ 
       // request method is POST 
       // defaultHttpClient 

       DefaultHttpClient httpClient = new DefaultHttpClient(); 
       HttpPost httpPost = new HttpPost(url); 
       httpPost.setEntity(new UrlEncodedFormEntity(params)); 

       HttpResponse httpResponse = httpClient.execute(httpPost); 
       HttpEntity httpEntity = httpResponse.getEntity(); 
       is = httpEntity.getContent(); 

      }else if(method == "GET"){ 
       // request method is GET 
       DefaultHttpClient httpClient = new DefaultHttpClient(); 
       String paramString = URLEncodedUtils.format(params, "utf-8"); 
       url += "?" + paramString; 
       HttpGet httpGet = new HttpGet(url); 

       HttpResponse httpResponse = httpClient.execute(httpGet); 
       HttpEntity httpEntity = httpResponse.getEntity(); 
       is = httpEntity.getContent(); 
      }   

     } catch (UnsupportedEncodingException e) { 
      e.printStackTrace(); 
     } catch (ClientProtocolException e) { 
      e.printStackTrace(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 

     try { 
      BufferedReader reader = new BufferedReader(new InputStreamReader(
        is, "utf-8"), 8); 
      StringBuilder sb = new StringBuilder(); 
      String line = null; 
      while ((line = reader.readLine()) != null) { 
       sb.append(line + "\n"); 
      } 
      is.close(); 
      json = sb.toString(); 
     } catch (Exception e) { 
      Log.e("Buffer Error", "Error converting result " + e.toString()); 

     } 
     Log.i("PHP Error", "["+json+"]"); 
     // try parse the string to a JSON object 
     try { 
      jObj = new JSONObject(json); 
     } catch (JSONException e) { 
      Log.e("JSON Parser", "Error parsing data " + e.getMessage() + json); 
     } 

     // return JSON String 
     return jObj; 

    } 

    public JSONArray getAllMessages(String url, String method, 
      List<NameValuePair> params) { 

     // Making HTTP request 
     try { 

      // check for request method 
      if(method == "POST"){ 
       // request method is POST 
       // defaultHttpClient 

       DefaultHttpClient httpClient = new DefaultHttpClient(); 
       HttpPost httpPost = new HttpPost(url); 
       httpPost.setEntity(new UrlEncodedFormEntity(params)); 

       HttpResponse httpResponse = httpClient.execute(httpPost); 
       HttpEntity httpEntity = httpResponse.getEntity(); 
       is = httpEntity.getContent(); 

      }else if(method == "GET"){ 
       // request method is GET 
       DefaultHttpClient httpClient = new DefaultHttpClient(); 
       String paramString = URLEncodedUtils.format(params, "utf-8"); 
       url += "?" + paramString; 
       HttpGet httpGet = new HttpGet(url); 

       HttpResponse httpResponse = httpClient.execute(httpGet); 
       HttpEntity httpEntity = httpResponse.getEntity(); 
       is = httpEntity.getContent(); 
      }   

     } catch (UnsupportedEncodingException e) { 
      e.printStackTrace(); 
     } catch (ClientProtocolException e) { 
      e.printStackTrace(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 

     try { 
      BufferedReader reader = new BufferedReader(new InputStreamReader(
        is, "utf-8"), 8); 
      StringBuilder sb = new StringBuilder(); 
      String line = null; 
      while ((line = reader.readLine()) != null) { 
       sb.append(line + "\n"); 
      } 
      is.close(); 
      json = sb.toString(); 
     } catch (Exception e) { 
      Log.e("Buffer Error", "Error converting result " + e.toString()); 

     } 
     Log.i("PHP Error", "["+json+"]"); 
     // try parse the string to a JSON object 
     try { 
      jArr = new JSONArray(json); 
     } catch (JSONException e) { 
      Log.e("JSON Parser", "Error parsing data " + e.getMessage() + json); 
     } 

     // return JSON String 
     return jArr; 

    } 
} 

活动

public class Home extends Activity { 

    private ProgressDialog pDialog; 

    JSONParser jsonParser = new JSONParser(); 
    String message; 

    private static String url_addmessage = "http://www.yourdomain.com/addmessage.php"; 

    private static final String TAG_SUCCESS = "success"; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_home); 

     final EditText et = (EditText)findViewById(R.id.editText1); 

     Button b1 = (Button)findViewById(R.id.button1); 
     Button b2 = (Button)findViewById(R.id.button2); 

     b1.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       // TODO Auto-generated method stub 
       try{ 
         message = et.getText().toString(); 

         Log.i("message to be posted", message); 

         new RegisterMe().execute(); 
       }catch(Exception e){ 
        Log.e("Exception while getting Message", e.getMessage().toString()); 
       } 

       } 
     }); 

     b2.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       // TODO Auto-generated method stub 
       startActivity(new Intent(Home.this, GetMessage.class)); 
      } 
     }); 


    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.activity_home, menu); 
     return true; 
    } 

    class RegisterMe extends AsyncTask<String, String, String>{ 
     String Message=null; 

     public boolean workdone(String Message){ 

      boolean x=false; 
      if(Message == "Done"){ 
       x=true; 
      } 
      return x; 
     } 

     @Override 
     protected void onPreExecute(){ 
      super.onPreExecute(); 
      pDialog = new ProgressDialog(Home.this); 
      pDialog.setMessage("Transaction In Progress... \n You Have The Right To Remain \n Silent & Patient :)"); 
      pDialog.setIndeterminate(false); 
      pDialog.setCancelable(true); 
      pDialog.show(); 
     } 

     @Override 
     protected String doInBackground(String... args) { 


      List<NameValuePair> params = new ArrayList<NameValuePair>(); 
      params.add(new BasicNameValuePair("message", message)); 

      JSONObject json = jsonParser.makeHttpRequest(url_addmessage, "GET", params); 

      Log.d("Create Response", json.toString()); 

      try{ 
       int success = json.getInt(TAG_SUCCESS); 
       if(success == 1){ 
        Message = "Done"; 
        Log.d("Work Done", "Message Added"); 
       } 
       else{ 

        Log.d("Work Done", "Message Not Added"); 
       } 
      } catch(JSONException e){ 
       e.printStackTrace(); 

      } 

      return null; 
     } 

     protected void onPostExecute(String file_url){ 
      pDialog.dismiss(); 
      if(new RegisterMe().workdone(Message)){ 
       Toast.makeText(Home.this, "Message Added Successfully.",Toast.LENGTH_LONG).show(); 
      } 
      else{ 
       Toast.makeText(Home.this, "Sorry There was some error in processing your request, please try after some time.",Toast.LENGTH_LONG).show(); 
      } 


     } 
    } 

}