1. update.jsp
1.2 默认是dataType是json
getJSON: function( url, data, callback ) { return jQuery.get(url, data, callback, "json"); }
2.
3.
3.2
protected void writeJSON(Object obj) { try { String json = mapper.writeValueAsString(obj); HttpServletResponse response = ServletActionContext.getResponse(); response.setContentLength(json.getBytes(utf8).length); response.setContentType("application/json;charset=UTF-8"); response.getWriter().write(json); } catch (Exception e) { e.printStackTrace(); throw new RuntimeException(e); } }