Android Volley框架的幾種post提交請求方式

   網絡通信框架Volley.它的設計目標是進行數據量不大，但通信頻繁的網絡操作，而對於大數據量的網絡操作，比如下載文件等，Volley的表現就不盡如人意。

  在app開發中,我們最常見的就是從app客戶端向服務端發一個http請求.對於兩種基本的web請求方式get和post來說,get請求方式相對比較簡單,在此略過不表.本文重點描述一下通過volley進行幾種post提交的方式.

1.客戶端以普通的post方式進行提交,服務端返回字符串




RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
 
StringRequest stringRequest = newStringRequest(Request.Method.POST,httpurl,
    newResponse.Listener<string>() {
        @Override
        publicvoid onResponse(String response) {
            Log.d(TAG,"response -> " + response);
        }
    },newResponse.ErrorListener() {
        @Override
        publicvoid onErrorResponse(VolleyError error) {
            Log.e(TAG, error.getMessage(), error);
        }
    }) {
    @Override
    protectedMap<string, string=""> getParams() {
        //在這裏設置需要post的參數
            Map<string, string=""> map = newHashMap<string, string="">(); 
            map.put("name1","value1"); 
            map.put("name2","value2"); 
 
          returnparams;
    }
};       
 
requestQueue.add(stringRequest);




2.客戶端以json串的post請求方式進行提交,服務端返回json串




RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
 
Map<string, string=""> map = newHashMap<string, string="">(); 
map.put("name1","value1"); 
map.put("name2","value2"); 
 
JSONObject jsonObject = newJSONObject(params);
JsonRequest<jsonobject> jsonRequest = newJsonObjectRequest(Method.POST,httpurl, jsonObject,
    newResponse.Listener<jsonobject>() {
        @Override
        publicvoid onResponse(JSONObject response) {
            Log.d(TAG,"response -> " + response.toString());
 
        }
    },newResponse.ErrorListener() {
        @Override
        publicvoid onErrorResponse(VolleyError error) {
            Log.e(TAG, error.getMessage(), error);
    }
    })
    {
    //注意此處override的getParams()方法,在此處設置post需要提交的參數根本不起作用

    //必須象上面那樣,構成JSONObject當做實參傳入JsonObjectRequest對象裏

    //所以這個方法在此處是不需要的

//    @Override
//    protected Map<string, string=""> getParams() {  

              
//          Map<string, string=""> map = new HashMap<string, string="">();  
//            map.put("name1", "value1");  
//            map.put("name2", "value2");  
                 
//        return params;
//    }
             
    @Override

    publicMap<string, string=""> getHeaders() {

        HashMap<string, string=""> headers = newHashMap<string, string="">();
        headers.put("Accept","application/json");
        headers.put("Content-Type","application/json; charset=UTF-8");
                 
        returnheaders;
    }
};
requestQueue.add(jsonRequest);




3.客戶端以普通的post方式進行提交,服務端返回json串





首先要繼承Request實現一個NormalPostRequest類，





private class NormalPostRequest extends Request<jsonobject> {
    private Map<string, string=""> mMap;
    private Listener<jsonobject> mListener;
 
    public NormalPostRequest(String url, Listener<jsonobject> listener,ErrorListener errorListener, Map<string, string=""> map) {
        super(Request.Method.POST, url, errorListener);
             
        mListener = listener;
        mMap = map;
    }
     
    //mMap是已經按照前面的方式,設置了參數的實例
    @Override
    protected Map<string, string=""> getParams() throws AuthFailureError {
        return mMap;
    }
     
    //此處因爲response返回值需要json數據,和JsonObjectRequest類一樣即可
    @Override
    protected Response<jsonobject> parseNetworkResponse(NetworkResponse response) {
        try {
            String jsonString = new String(response.data,HttpHeaderParser.parseCharset(response.headers));
                 
            return Response.success(new JSONObject(jsonString),HttpHeaderParser.parseCacheHeaders(response));
        } catch (UnsupportedEncodingException e) {
            return Response.error(new ParseError(e));
        } catch (JSONException je) {
            return Response.error(new ParseError(je));
        }
    }
 
    @Override
    protected void deliverResponse(JSONObject response) {
        mListener.onResponse(response);
    }
}







接下來的調用方式和前面差不多,生成一個Request實例,加入隊列中即可








RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
 
Request<jsonobject> request = new NormalPostRequest(httpurl,
    new Response.Listener<jsonobject>() {
        @Override
        public void onResponse(JSONObject response) {
            Log.d(TAG, "response -> " + response.toString());
        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            Log.e(TAG, error.getMessage(), error);
        }
    }, params);
 
requestQueue.add(request);