Volley是否有JSON参数，字符串响应本机支持

Question

我想发一个服务器POST请求，发送一个JSON负载，并接收一个字符串响应作为回报。我已到处寻找，似乎没有一种简单的方法来使用Volley库来实现此功能，而无需实施自定义请求（我在尝试实现时完全失去了它）。什么是正确的方式来执行这个POST请求？

Answer 1

final JSONObject body = new JSONObject(); 
    try { 
     // Todo: populate JSON body 
    } catch (JSONException e) { 
     e.printStackTrace(); 
    } 

    StringRequest stringRequest = new StringRequest(Request.Method.POST, "http://...", 
      new Response.Listener<String>() { 
       @Override 
       public void onResponse(String response) { 

       } 
      }, 
      new Response.ErrorListener() { 
       @Override 
       public void onErrorResponse(VolleyError error) { 

       } 
      } 
    ) { 
     @Override 
     public byte[] getBody() throws AuthFailureError { 
      return body.toString().getBytes(); 
     } 

     @Override 
     public String getBodyContentType() { 
      return "application/json"; 
     } 
    }; 

    RequestQueue requestQueue = Volley.newRequestQueue(this); 
    requestQueue.add(stringRequest); 

Answer 2

排球有JsonObjectRequest和JsonArrayRequest。

/** 
    * Making json object request 
    * */ 
    public void makeJsonObjReq(String url) { 

     JsonObjectRequest jsonObjReq = new JsonObjectRequest(Request.Method.GET, 
       url, 
       new Response.Listener<JSONObject>() { 

        @Override 
        public void onResponse(JSONObject response) { 
         Log.d(TAG, response.toString()); 
//      msgResponse.setText(response.toString()); 

        } 
       }, new Response.ErrorListener() { 

      @Override 
      public void onErrorResponse(VolleyError error) { 
       VolleyLog.d(TAG, "Error: " + error.getMessage()); 

      } 
     }) { 

      /** 
      * Passing some request headers 
      * */ 
      @Override 
      public Map<String, String> getHeaders() throws AuthFailureError { 
       HashMap<String, String> headers = new HashMap<String, String>(); 
       headers.put("Content-Type", "application/json"); 
       return headers; 
      } 

      @Override 
      protected Map<String, String> getParams() { 
       Map<String, String> params = new HashMap<String, String>(); 
       params.put("name", "[email protected]"); 
       return params; 
      } 

     }; 

     // Adding request to request queue 
     ApplicationController.getInstance().addToRequestQueue(jsonObjReq, 
       tag_json_obj); 

     // Cancelling request 
     // ApplicationController.getInstance().getRequestQueue().cancelAll(tag_json_obj); 
    } 



/** 
    * Making json array request 
    * */ 
    public void makeJsonArryReq(String url, final int _type) { 

     JsonArrayRequest req = new JsonArrayRequest(url, 
       new Response.Listener<JSONArray>() { 
        @Override 
        public void onResponse(JSONArray response) { 
         Log.d(TAG, response.toString()); 
         apiTaskListener.onTaskComplete("error",_type); 


        } 
       }, new Response.ErrorListener() { 
      @Override 
      public void onErrorResponse(VolleyError error) { 
       VolleyLog.d(TAG, "Error: " + error.getMessage()); 
       apiTaskListener.onTaskComplete("error",_type); 

      } 
     }); 

     // Adding request to request queue 
     ApplicationController.getInstance().addToRequestQueue(req, 
       tag_json_arry); 

     // Cancelling request 
     // ApplicationController.getInstance().getRequestQueue().cancelAll(tag_json_arry); 
    }