JSON文档解析 Google提供的GSON的jar包，利用JSONReader方法

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解析的文档内容为：
{

  "responseCode": 0,

  "msgInfo": "业务处理成功。",

  "msgDetailInfo": null,

  "data": [

    {

      "pbtId": 1,

      "pbtName": "公积金",

      "keyGroupList": [

        {

          "keyGroupId": 1,

          "itemId": 10001,

          "keyList": [

            {

              "keyValueId": 1,

              "cityCode": "3501",

              "cityName": "福州",

              "keyName": "housFundAccount",

              "keyText": "账号",

              "keyDesc": "公积金的账号",

              "keyValue": "350104198001019999",

              "isPrivate": "0"

            },

            {

              "keyValueId": 2,

              "cityCode": "3501",

              "cityName": "福州",

              "keyName": "housFundPassword",

              "keyText": "密码",

              "keyDesc": "公积金的密码",

              "keyValue": "9999",

              "isPrivate": "1"

            }

          ]

        },

        {

          "keyGroupId": 2,

          "itemId": 10002,

          "keyList": [

            {

              "keyValueId": 3,

              "cityCode": "3502",

              "cityName": "厦门",

              "keyName": "housFundAccount",

              "keyText": "账号",

              "keyDesc": "公积金的账号",

              "keyValue": "350204198001018888",

              "isPrivate": "0"

            },

            {

              "keyValueId": 4,

              "cityCode": "3502",

              "cityName": "厦门",

              "keyName": "housFundPassword",

              "keyText": "密码",

              "keyDesc": "公积金的密码",

              "keyValue": "8888",

              "isPrivate": "1"

            }

          ]

        }

      ]

    },

    {

      "pbtId": 2,

      "pbtName": "医保",

      "keyGroupList": [

        {

          "keyGroupId": 3,

          "itemId": 10003,

          "keyList": [

            {

              "keyValueId": 5,

              "cityCode": "3501",

              "cityName": "福州",

              "keyName": "mediInsuranceAccount",

              "keyText": "账号",

              "keyDesc": "医保的账号",

              "keyValue": "350104198001019999",

              "isPrivate": "0"

            },

            {

              "keyValueId": 6,

              "cityCode": "3501",

              "cityName": "福州",

              "keyName": "mediInsurancePassword",

              "keyText": "密码",

              "keyDesc": "医保的密码",

              "keyValue": "111111",

              "isPrivate": "1"

            }

          ]

        },

        {

          "keyGroupId": 4,

          "itemId": 10004,

          "keyList": [

            {

              "keyValueId": 7,

              "cityCode": "3502",

              "cityName": "厦门",

              "keyName": "mediInsuranceAccount",

              "keyText": "账号",

              "keyDesc": "医保的账号",

              "keyValue": "350204198001018888",

              "isPrivate": "0"

            },

            {

              "keyValueId": 8,

              "cityCode": "3502",

              "cityName": "厦门",

              "keyName": "mediInsurancePassword",

              "keyText": "密码",

              "keyDesc": "医保的密码",

              "keyValue": "000000",

              "isPrivate": "1"

            }

          ]

        }

      ]

    }

  ]

}
 
解析步骤：
第一步：创建不同的javaBean用于存储每一层的属性值；
第二步：若是JSON文档存放在Assets中，获取文档的内容存在在String中

 /**

  * 获取文件流

  * @param context

  * @return

  * @throws IOException

  */

 public InputStream getInputStream(Context context,String fileName) throws IOException{

  

  AssetManager am=context.getAssets();

  InputStream is=am.open(fileName);

  return is;

 }

 /**

  * 将文件中的内容，保存在String中

  * @param is

  * @return

  * @throws IOException

  */

 public String getFileData(InputStream is) throws IOException{

  

  BufferedReader br=new BufferedReader(new InputStreamReader(is));

  StringBuilder sb=new StringBuilder();

  String str;

  while((str=br.readLine())!=null){

   sb.append(str);

  }

  return sb.toString();

 }

 /**

  * 获取文件资源内容

  * @param context

  * @param fileName

  * @return

  * @throws IOException

  */

 public String getFileData(Context context,String fileName) throws IOException{

  FileUtil fileUtil=new FileUtil();

  InputStream is=fileUtil.getInputStream(context, fileName);

  return fileUtil.getFileData(is);

 }

第三步：解析文件
private ArrayList<Business> arrayListBusiness = new ArrayList<Business>();

 private ArrayList<Datas> arrayListDatas = new ArrayList<Datas>();

 private ArrayList<KeyGroupList> arrayListKeyGroupList = new ArrayList<KeyGroupList>();

 private ArrayList<KeyList> arrayListKeyList = new ArrayList<KeyList>();
 
 private Business business;

 private Datas datas;

 private KeyGroupList keyGroupList;

 private KeyList keyList;

/**

  * 用Android自带的JSONObject和JSONArray方法

  * @throws IOException

  */

 public void getData1() throws IOException {
 
  String strData = fileUtil.getFileData(this, "test.txt");

  StringReader sr = new StringReader(strData);

  JsonReader jr = new JsonReader(sr);

  jr.beginObject();

  business = new Business();

  if (jr.nextName().contains("responseCode")) {

   int responseCode = jr.nextInt();

   Log.v("responseCode", "" + responseCode);

   business.setResponseCode(responseCode);

  }

  if (jr.nextName().equals("msgInfo")) {

   String msgInfo = jr.nextString();

   Log.v("msgInfo", msgInfo);

   business.setMsgInfo(msgInfo);

  }

  if (jr.nextName().equals("msgDetailInfo")) {

   String msgDetailInfo = jr.nextString();

   Log.v("msgDetailInfo", msgDetailInfo);

   business.setMsgDetailInfo(msgDetailInfo);

  }

  if (jr.nextName().equals("data")) {

   jr.beginArray();

   while (jr.hasNext()) {

    datas = new Datas();

    jr.beginObject();

    if (jr.nextName().equals("pbtId")) {

     int pbtId = jr.nextInt();

     Log.v("pbtId", "" + pbtId);

     datas.setPbtId(pbtId);

    }

    if (jr.nextName().equals("pbtName")) {

     String pbtName = jr.nextString();

     Log.v("pbtName", "" + pbtName);

     datas.setPbtName(pbtName);

    }

    if (jr.nextName().equals("keyGroupList")) {

     jr.beginArray();

     while (jr.hasNext()) {

      keyGroupList = new KeyGroupList();

      jr.beginObject();

      if (jr.nextName().equals("keyGroupId")) {

       int keyGroupId = jr.nextInt();

       Log.v("keyGroupId", "" + keyGroupId);

       keyGroupList.setKeyGroupId(keyGroupId);

      }

      if (jr.nextName().equals("itemId")) {

       String itemId = jr.nextString();

       Log.v("itemId", itemId);

       keyGroupList.setItemId(itemId);

      }

      if (jr.nextName().equals("keyList")) {

       jr.beginArray();

       while (jr.hasNext()) {

        keyList = new KeyList();

        jr.beginObject();

        if (jr.nextName().equals("keyValueId")) {

         int keyValueId = jr.nextInt();

         Log.v("keyValueId", "" + keyValueId);

         keyList.setKeyValueId(keyValueId);

        }

        if (jr.nextName().equals("cityCode")) {

         String cityCode = jr.nextString();

         Log.v("cityCode", cityCode);

         keyList.setCityCode(cityCode);

        }

        if (jr.nextName().equals("cityName")) {

         String cityName = jr.nextString();

         Log.v("cityName", cityName);

         keyList.setCityName(cityName);

        }

        if (jr.nextName().equals("keyName")) {

         String keyName = jr.nextString();

         Log.v("keyName", keyName);

         keyList.setKeyName(keyName);

        }

        if (jr.nextName().equals("keyText")) {

         String keyText = jr.nextString();

         Log.v("keyText", keyText);

         keyList.setKeyText(keyText);

        }

        if (jr.nextName().equals("keyDesc")) {

         String keyDesc = jr.nextString();

         Log.v("keyDesc", keyDesc);

         keyList.setKeyDesc(keyDesc);

        }

        if (jr.nextName().equals("keyValue")) {

         String keyValue = jr.nextString();

         Log.v("keyValue", keyValue);

         keyList.setKeyValue(keyValue);

        }

        if (jr.nextName().equals("isPrivate")) {

         int isPrivate = jr.nextInt();

         Log.v("isPrivate", "" + isPrivate);

         keyList.setIsPrivate(isPrivate);

        }

        jr.endObject();

        arrayListKeyList.add(keyList);

       }
 
       jr.endArray();

       keyGroupList.setArrayListKeyList(arrayListKeyList);

      }

      jr.endObject();

      arrayListKeyGroupList.add(keyGroupList);

     }

     jr.endArray();

     datas.setArrayListKeyGroupList(arrayListKeyGroupList);

    }

    jr.endObject();

    arrayListDatas.add(datas);

   }

   jr.endArray();

   business.setArrayListDatas(arrayListDatas);

  }

  jr.endObject();

  arrayListBusiness.add(business);

 }