Java JSON：在服务器上解析JSON数据时出现问题

当我将json数据从Android传递到服务器时，解析时服务器上会出现如下错误。org.json.JSONException:JSONObject文本必须以“{”开头，位于1[字符2第1行]

servlet代码是：

protected void doProcess(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {

        BufferedReader br = request.getReader();

        String sCurrentLine;
        StringBuilder sb = new StringBuilder();

        while ((sCurrentLine = br.readLine()) != null) {
            sb.append(sCurrentLine);
        }

        System.out.println(sb.toString().substring(4));

        try {
            JSONArray jArray = new JSONArray(sb.toString().substring(4));
            for (int i = 0; i < jArray.length(); i++) {
                JSONObject json_data = jArray.getJSONObject(i);
                json_data.getString("dwsList");
            }

        } catch (JSONException e) {
            e.printStackTrace();
        }

    }

当我在服务器中打印Json数据时，它看起来像

 str=%5B%7B%22dwsList%22%3A%5B%7B%22farmer_name%22%3A%22JINJU%22%2C%22dws_date%22%3A%222013-03-08%22%2C%22farmer_code%22%3A%2210004%22%2C%22dws_num%22%3A%2253%22%2C%22dws_id%22%3A4%2C%22bag_weight%22%3A3000.0%2C%22net_weight%22%3A2000.0%2C%22selected%22%3Afalse%2C%22str_id%22%3A0%2C%22totalBags%22%3A20%7D%2C%7B%22farmer_name%22%3A%22KANNAN%22%2C%22dws_date%22%3A%222013-03-08%22%2C%22farmer_code%22%3A%2210005%22%2C%22dws_num%22%3A%2254%22%2C%22dws_id%22%3A5%2C%22bag_weight%22%3A1500.0%2C%22net_weight%22%3A1000.0%2C%22selected%22%3Afalse%2C%22str_id%22%3A0%2C%22totalBags%22%3A10%7D%5D%2C%22str_total_weight%22%3A4000.0%2C%22str_date%22%3A%222013-03-08%22%2C%22str_number%22%3A%221003%22%2C%22str_id%22%3A4%2C%22str_total_bag%22%3A0%2C%22status%22%3A0%2C%22selected%22%3Afalse%7D%5D

---

您可以尝试下面的代码来解析JSON

{
"result": "success",
"countryCodeList":
[
{"countryCode":"00","countryName":"World Wide"},
{"countryCode":"kr","countryName":"Korea, Republic of"},
{"countryCode":"us","countryName":"United States"},
{"countryCode":"jp","countryName":"Japan"},
{"countryCode":"cn","countryName":"China"},
{"countryCode":"in","countryName":"India"}
]
}

public static ArrayList<Country> ParseJson(String jsonstring) {

    ArrayList<Country> arrCountries = new ArrayList<Country>();

    String status;
    String message = "";
    try {


        JSONObject json = new JSONObject(jsonstring);

        status = json.getString("result");

        if (status.equalsIgnoreCase("success")) {


            JSONArray nameArray = json.names();
            JSONArray valArray = json.toJSONArray(nameArray);

            JSONArray valArray1 = valArray.getJSONArray(1);

            valArray1.toString().replace("[", "");
            valArray1.toString().replace("]", "");

            int len = valArray1.length();

            for (int i = 0; i < valArray1.length(); i++) {

                Country country = new Country();
                JSONObject arr = valArray1.getJSONObject(i);

                country.setCountryCode(arr.getString("countryCode"));
                country.setCountryName(arr.getString("countryName"));
                arrCountries.add(country);
            }
        }

    } catch (JSONException e) {
        Log.e("JSON", "There was an error parsing the JSON", e);
    }
    return arrCountries;
}

{
“结果”：“成功”，
“countryCodeList”：
[
{“countryCode”：“00”，“countryName”：“World Wide”}，
{“国家代码”：“kr”，“国家名称”：“大韩民国”}，
{“国家代码”：“美国”，“国家名称”：“美国”}，
{“countryCode”：“jp”，“countryName”：“Japan”}，
{“国家代码”：“cn”，“国家名称”：“中国”}，
{“countryCode”：“in”，“countryName”：“India”}
]
}
公共静态ArrayList ParseJson（字符串jsonstring）{
ArrayList arrCountries=新的ArrayList（）；
字符串状态；
字符串消息=”；
试一试{
JSONObject json=新的JSONObject（jsonstring）；
status=json.getString（“结果”）；
if（status.equalsIgnoreCase（“success”））{
JSONArray nameArray=json.names（）；
JSONArray valArray=json.toJSONArray（nameArray）；
JSONArray valArray1=valArray.getJSONArray（1）；
valArray1.toString（）.replace（“[”，”）；
valArray1.toString（）.replace（“]”，“”）；
int len=valArray1.length（）；
for（int i=0；i

发布完整的logcat消息或你在日志中得到的信息

System.out.println（sb.toString（））

行你如何打印json？你能粘贴代码吗？@javapirate在android nameValuePairs中。添加（新的asicNameValuePair（“str”，新的Gson（）.toJson（strlist）））；@JinjuJoseph问题是，当您在doProcess method（）中接收到json字符串时，它不会对特殊字符进行转义。请确保在将它们传递给此方法之前转义所有的

{[：

。我在JSONObject json=new JSONObject（jsonstring）时遇到问题；我无法将字符串解析为JSONObject，请查看代码

 str=%5B%7B%22dwsList%22%3A%5B%7B%22farmer_name%22%3A%22JINJU%22%2C%22dws_date%22%3A%222013-03-08%22%2C%22farmer_code%22%3A%2210004%22%2C%22dws_num%22%3A%2253%22%2C%22dws_id%22%3A4%2C%22bag_weight%22%3A3000.0%2C%22net_weight%22%3A2000.0%2C%22selected%22%3Afalse%2C%22str_id%22%3A0%2C%22totalBags%22%3A20%7D%2C%7B%22farmer_name%22%3A%22KANNAN%22%2C%22dws_date%22%3A%222013-03-08%22%2C%22farmer_code%22%3A%2210005%22%2C%22dws_num%22%3A%2254%22%2C%22dws_id%22%3A5%2C%22bag_weight%22%3A1500.0%2C%22net_weight%22%3A1000.0%2C%22selected%22%3Afalse%2C%22str_id%22%3A0%2C%22totalBags%22%3A10%7D%5D%2C%22str_total_weight%22%3A4000.0%2C%22str_date%22%3A%222013-03-08%22%2C%22str_number%22%3A%221003%22%2C%22str_id%22%3A4%2C%22str_total_bag%22%3A0%2C%22status%22%3A0%2C%22selected%22%3Afalse%7D%5D

{
"result": "success",
"countryCodeList":
[
{"countryCode":"00","countryName":"World Wide"},
{"countryCode":"kr","countryName":"Korea, Republic of"},
{"countryCode":"us","countryName":"United States"},
{"countryCode":"jp","countryName":"Japan"},
{"countryCode":"cn","countryName":"China"},
{"countryCode":"in","countryName":"India"}
]
}

public static ArrayList<Country> ParseJson(String jsonstring) {

    ArrayList<Country> arrCountries = new ArrayList<Country>();

    String status;
    String message = "";
    try {


        JSONObject json = new JSONObject(jsonstring);

        status = json.getString("result");

        if (status.equalsIgnoreCase("success")) {


            JSONArray nameArray = json.names();
            JSONArray valArray = json.toJSONArray(nameArray);

            JSONArray valArray1 = valArray.getJSONArray(1);

            valArray1.toString().replace("[", "");
            valArray1.toString().replace("]", "");

            int len = valArray1.length();

            for (int i = 0; i < valArray1.length(); i++) {

                Country country = new Country();
                JSONObject arr = valArray1.getJSONObject(i);

                country.setCountryCode(arr.getString("countryCode"));
                country.setCountryName(arr.getString("countryName"));
                arrCountries.add(country);
            }
        }

    } catch (JSONException e) {
        Log.e("JSON", "There was an error parsing the JSON", e);
    }
    return arrCountries;
}