SPRINGMVC return JSON string (non-annotated)

The non-annotated form used here is equivalent to the @responsebody in the annotation

/** * Output JSON based on string, return null * * @param jsonstring * @return */public string Ajaxjson (Httpservletresp    Onse response,string jsonstring) {return Ajax (response,jsonstring, "text/html"); }

/**     *  return JSON string (non-annotated form)      * ajax output, return null      *      *  @param  content      *  @param  type     *  @return       */    public string ajax (httpservletresponse response, string  content, string type)  {        try {             response.setcontenttype (type +  "; Charset=utf-8 ");             response.setheader (" Pragma ", " No-cache ");             Response.setheader ("Cache-control",  "No-cache");             response.setdateheader ("EXpires ",  0);             response.getwriter (). Write (content);             response.getwriter (). Flush ();        } catch  (ioexception e)  {         e.printstacktrace ();             logger.error ("IOException:",  e);         }         return null;    }

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SPRINGMVC return JSON string (non-annotated)