语法错误JSON.parse ajax.responsetext（Spring，jquery，ajax，gson）(Syntax Error JSON.parse ajax.responsetext (Spring,jquery,ajax,gson))

 我使用Netbeans＆spring framework4.0.1，没有注释只有普通的模型和视图 
 
 当我尝试发送JSON到jsp页面并使用ajax函数回调时，我无法解析响应文本，并给我出现此错误“SyntaxError：JSON.parse：JSON数据的第12行第1列出现意外字符”这是控制器代码 
 
 public ModelAndView contentlistObjective(HttpServletRequest hsr, HttpServletResponse hsr1) throws Exception {
            ModelAndView mv = new ModelAndView("createsettings");
           List<Content> contents = new ArrayList<>();
     //       JSONObject obj = new JSONObject();
           try {
             DriverManagerDataSource dataSource;
            dataSource = (DriverManagerDataSource)this.getBean("dataSource",hsr.getServletContext());
            this.cn = dataSource.getConnection();  
                 Statement st = this.cn.createStatement();
                 String objectiveid = null;
                    objectiveid = hsr.getParameter("seleccion3");         
              ResultSet rs1 = st.executeQuery("SELECT name,id FROM         public.content where public.content.id IN (select public.objective_content.content_id from public.objective_content where public.objective_content.objective_id = "+objectiveid+")");

           while (rs1.next())
            {
     Content eq = new Content();
     contents.add(eq);
//   obj.put("name", rs1.getString("name"));

            }

        } catch (SQLException ex) {
            System.out.println("Error leyendo contents: " + ex);
        }
       Gson gson = new GsonBuilder().setPrettyPrinting().create();
       String json = gson.toJson(contents);
       hsr1.setContentType("application/json");

//      System.out.print(json);
//      json = json.replaceAll("\n", "");
//      json = json.trim();
//      json = json.substring(1,json.length()-1);
//      json = json.replace("\\","");
       mv.addObject(json);
        return mv;
    }   
 
 当我调试我正在返回的JSON有这个值[{“name”：“newspaper”}，{“name”：“novel”}]下面是JSP代码 
 
function comboSelectionObjective()
            {
                if (window.XMLHttpRequest) //mozilla
                {
                    ajax = new XMLHttpRequest(); //No Internet explorer
                } else
                {
                    ajax = new ActiveXObject("Microsoft.XMLHTTP");
                }             

                ajax.onreadystatechange = funcionCallBackContent;
             var seleccion3 = document.getElementById("objective").value;
                ajax.open("GET", "createsetting.htm?select=contentlistObjective&seleccion3=" + seleccion3, true);
                ajax.send("");
}
function funcionCallBackContent()
            {
                if (ajax.readyState === 4) {
                    if (ajax.status===200){
                   var data =JSON.parse(ajax.responseText);
                 console.log(data);
                 }
 
 我使用的是gson库，我之前使用Json简单，但它给了完全相同的错误，我也试图替换所有的转义字符，并没有工作 
 
 是不是使用注释的问题？ 
 
 感谢你的帮助 

I am using Netbeans & spring framework4.0.1,without annotation only normal model&view
 
When i try to send a JSON to the jsp page & using ajax function call back , i am unable to parse the response text, gives me this error "SyntaxError: JSON.parse: unexpected character at line 12 column 1 of the JSON data" This is the controller code
 
 public ModelAndView contentlistObjective(HttpServletRequest hsr, HttpServletResponse hsr1) throws Exception {
            ModelAndView mv = new ModelAndView("createsettings");
           List<Content> contents = new ArrayList<>();
     //       JSONObject obj = new JSONObject();
           try {
             DriverManagerDataSource dataSource;
            dataSource = (DriverManagerDataSource)this.getBean("dataSource",hsr.getServletContext());
            this.cn = dataSource.getConnection();  
                 Statement st = this.cn.createStatement();
                 String objectiveid = null;
                    objectiveid = hsr.getParameter("seleccion3");         
              ResultSet rs1 = st.executeQuery("SELECT name,id FROM         public.content where public.content.id IN (select public.objective_content.content_id from public.objective_content where public.objective_content.objective_id = "+objectiveid+")");

           while (rs1.next())
            {
     Content eq = new Content();
     contents.add(eq);
//   obj.put("name", rs1.getString("name"));

            }

        } catch (SQLException ex) {
            System.out.println("Error leyendo contents: " + ex);
        }
       Gson gson = new GsonBuilder().setPrettyPrinting().create();
       String json = gson.toJson(contents);
       hsr1.setContentType("application/json");

//      System.out.print(json);
//      json = json.replaceAll("\n", "");
//      json = json.trim();
//      json = json.substring(1,json.length()-1);
//      json = json.replace("\\","");
       mv.addObject(json);
        return mv;
    }   
 
When i debug json that i am returning has this value [ { "name": "newspaper" }, { "name": "novel" } ] Below is the JSP code
 
function comboSelectionObjective()
            {
                if (window.XMLHttpRequest) //mozilla
                {
                    ajax = new XMLHttpRequest(); //No Internet explorer
                } else
                {
                    ajax = new ActiveXObject("Microsoft.XMLHTTP");
                }             

                ajax.onreadystatechange = funcionCallBackContent;
             var seleccion3 = document.getElementById("objective").value;
                ajax.open("GET", "createsetting.htm?select=contentlistObjective&seleccion3=" + seleccion3, true);
                ajax.send("");
}
function funcionCallBackContent()
            {
                if (ajax.readyState === 4) {
                    if (ajax.status===200){
                   var data =JSON.parse(ajax.responseText);
                 console.log(data);
                 }
 
i am using gson library, i used before it Json simple but it gave exactly the same error also i tried to replace all escape characters and did not work either
 
Is the problem that i am not using annotations?
 
Appreciate your help

原文：https://stackoverflow.com/questions/43093916