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我试图在Android服务器上发布json时遇到问题.错误是:

加载JSON失败.请求中不得包含特殊字符.请检查所请求的JSON.

我遵循了许多例子,但没有一个是有帮助的.请提供解决方案或帮助我在代码中找到问题.

下面是在服务器上发布JSON字符串的代码.

public class JSONParser {

    static InputStream is = null;
    static JSONObject jObj = null;
    static String json = "";

    // constructor
    public JSONParser() {

    }

    public JSONObject getJSONFromUrl(String url) {

        // Making HTTP request
        try {
            // defaultHttpClient
            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpPost httpPost = new HttpPost(url);
            /* ====================================================================================================*/

                        JSONObject listobj = new JSONObject ();
                        JSONObject listInvoice = new JSONObject ();
                        listInvoice.put("client_id","");
                        listInvoice.put("date_from","");
                        listInvoice.put("date_to","");
                        listInvoice.put("invoice_number","");
                        listInvoice.put("invoice_record_status","");
                        listInvoice.put("invoice_status","");
                        listInvoice.put("page","1");
                        listInvoice.put("per_page_record","10");
                        listobj.put("listInvoice", listInvoice);


                      //--List nameValuePairs = new …