跨域问题和response
// 跨域问题 // 返回前台 HashMap<String, Object> map = new HashMap<String, Object>(); map.put("status", false); map.put("msg", "文件不存在"); response.setHeader("Access-Control-Allow-Origin", "*"); response.getWriter().print(JSON.toJSON(map)); return;
String token = request.getHeader("token"); // 获取请求头
String params = request.getParameter("params"); // 获取参数值