Android项目前后台交互问题,通过JSON传值

CrazyDao层

package com.liang.a.util;

import android.database.Cursor;
import android.util.Log;

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

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

public class CrazyDao {
    public static ArrayList<Crazy> inputSingleJson(String json){
        String[] jsonAll = json.split("\\},");
        ArrayList<Crazy> list_all = new ArrayList();
        for (int i=0 ; i < jsonAll.length ; i++){
            Crazy crazy = new Crazy();
            String[] splitJson = jsonAll[i].split(",");
            crazy.setAnswer(splitJson[0].split(":")[1].split("\"")[1]);
            crazy.setId(Integer.parseInt(splitJson[1].split(":")[1]));
            crazy.setQuestion_img(splitJson[2].split(":")[1].split("\"")[1]);
            crazy.setQuestion_type(splitJson[3].split(":")[1].split("\"")[1]);
            crazy.setSelect_txt(splitJson[4].split(":")[1].split("\"")[1]);
            list_all.add(crazy);
        }
        return list_all;
    }

    private static String readInputStreamToString(InputStream is) {
        byte[] result;
        try {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            byte[] buffer = new byte[1024];
            int len;
            while ((len = is.read(buffer)) != -1) {
                baos.write(buffer, 0, len);
            }
            is.close();
            baos.close();
            result = baos.toByteArray();
        } catch (IOException e) {
            e.printStackTrace();
            return "获取数据失败";
        }
        return new String(result);
    }

    public static int getDataSize() {
        int size=0;
        try {
            URL url = null;
            url = new URL("http://10.0.2.2:8080/AndroidTest/GetAnserSize");
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setReadTimeout(5000);
            conn.setRequestMethod("GET");
            String resp_content = "";
            int code = conn.getResponseCode();
            if (conn.getResponseCode() == 200) {
                InputStream is = conn.getInputStream();//从这里获取JSON数据,然后放到readInputStreamToString里面解析
                size = Integer.valueOf(readInputStreamToString(is));//54
            } else {
                Log.e("fail", "fail");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return size;
    }

    public static List<Map<String,Object>> getStageData(int nowStage){
        List<Map<String,Object>> values = new ArrayList<>();
        try {
            ArrayList<Crazy> list = new ArrayList();
            URL url = null;
            url = new URL("http://10.0.2.2:8080/AndroidTest/CheckAllServlet");
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setReadTimeout(5000);
            conn.setRequestMethod("GET");
            String resp_content = "";
            int code = conn.getResponseCode();
            if (conn.getResponseCode() == 200) {
                InputStream is = conn.getInputStream();
                resp_content=readInputStreamToString(is);
                list = inputSingleJson(resp_content);
                for(int i=0;i<list.size();i++){
                    Map<String ,Object> map = new HashMap<>();
                    map.put("stage",list.get(i).getId());
                    if (nowStage >= list.get(i).getId()){//如果当前关不比取得的关数小
                        map.put("overFlag",true);//设置成true,证明玩过了的关
                    }else{
                        map.put("overFlag",false);//证明没玩儿过的关
                }
                values.add(map);//添加到列表中
                }
            } else {
                Log.e("fail", "fail");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return  values;
    }
    public static Map<String,Object> getDataById(int id){
        Map<String,Object> map = new HashMap<>();
        try {
            ArrayList<Crazy> list = new ArrayList();
            URL url = null;
            url = new URL("http://10.0.2.2:8080/AndroidTest/CheckMesById?id="+id);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setReadTimeout(5000);
            conn.setRequestMethod("GET");
            String resp_content = "";
            int code = conn.getResponseCode();
            if (conn.getResponseCode() == 200) {
                InputStream is = conn.getInputStream();
                resp_content=readInputStreamToString(is);
//                Log.e("content",resp_content);
                JSONObject json = new JSONObject(resp_content);
                map.put("answer",json.getString("answer"));
                map.put("questionType",json.getString("question_type"));
                map.put("questionImg",json.getString("question_img"));
                map.put("selectTxt",json.getString("select_txt"));
            } else {
                Log.e("fail", "fail");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        return map;
    }
}