ถามวิธี Android Studio ส่ง JSON เข้า Web Server ครับ

package com.tghservice; // เปลี่ยนตาม งาน

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

public class JSTools {
    // -------------------------------------------------------
    // JSON tool:: JSON String to JSON
    public JSONObject str2Obj(String str){
        JSONObject rs;
        try {
            rs = new JSONObject(str);
        }catch(Exception e){
            rs = str2Obj("{msg: \"error\", error: \""+e.getMessage()+"\"}");
        }
        return rs;
    }
    // -------------------------------------------------------
    public String obj2Str(JSONObject js){
        String rs;
        try {
            rs = js.toString();
        }catch(Exception e){
            rs = "{msg: \"error\", error: \""+e.getMessage()+"\"}";
        }
        return rs;
    }
    // -------------------------------------------------------
    public JSONObject Array2Obj(JSONArray ar, int idx, String def){
        JSONObject rs;
        try {
            rs = ar.getJSONObject(idx);
        }catch(Exception e){
            if(def.length()>0) {
                rs = str2Obj(def);
            }else{
                rs = str2Obj("{msg: \"error\", error: \""+e.getMessage()+"\"}");
            }
        }
        return rs;
    }
    // -------------------------------------------------------
    public void put(JSONObject js, String Key, String Val){
        try {
            js.put(Key, Val);
        }catch(Exception e){
            //
        }
    }
    // -------------------------------------------------------
    public String Value2Str(JSONObject js, String Key){
        String rs;
        try {
            rs = js.getString(Key);
        }catch(Exception e){
            rs = "";
        }
        return rs;
    }
    // -------------------------------------------------------
    public double Value2double(JSONObject js, String Key){
        double rs;
        try {
            rs = js.getDouble(Key);
        }catch(Exception e){
            rs = 0.0;
        }
        return rs;
    }
    // -------------------------------------------------------
    public int Value2Int(JSONObject js, String Key){
        int rs;
        try {
            rs = js.getInt(Key);
        }catch(Exception e){
            rs = 0;
        }
        return rs;
    }
    // -------------------------------------------------------
    public JSONArray Value2Array(JSONObject js, String Key){
        JSONArray rs;
        try {
            rs = js.getJSONArray(Key);
        }catch(Exception e){
            rs = new JSONArray();
        }
        return rs;
    }
}