ajax请求代码:
//区域事件选择配送点 function changeDistrict(value){ if(value == 0){ $('#transport_node').empty(); $('#transport_node').append('<option value="0">请选择</option>'); return; } $('#transport_node').empty(); $('#transport_node').append('<option value="0">加载中...</option>'); $.ajax({ type: 'GET', url: "http://192.168.33.114:8080/UIDTraceAdmin/transportnode/pagelist/jsonp?callbackFunction=jsonpCallback", async: false, dataType: "jsonp", jsonp: "jsonpCallback",//传递给请求处理程序或页面的,用以获得jsonp回调函数名的参数名(一般默认为:callback) success: function(o){}, timeout:3000 }); } function jsonpCallback(result) { if(result.success == true){ $('#transport_node').empty(); $('#transport_node').append('<option value="0">请选择</option>'); $.each(result.transportList, function(i, n){ var html = '<option value="'+n.nodeId+'">'+n.transportnodeName+'</option>'; $('#transport_node').append(html) }); }else{ $('#transport_node').empty(); $('#transport_node').append('<option value="0">请选择</option>'); } }
要点:
1.url中的请求参数callbackFunction=jsonpCallback这是服务器响应返回后调用的javascript方法的名称
2.dataType要为jsonp
跨域服务器处理代码:
@RequestMapping("/pagelist/jsonp") public void pagelist(@ModelAttribute TransportNode node,HttpServletRequest httpReq, HttpSession session,HttpServletResponse response) { //返回头部设置 response.setHeader("Pragma", "No-cache"); response.setHeader("Cache-Control", "no-cache"); response.setHeader("Content-type", "application/x-javascript;charset=utf-8"); response.setDateHeader("Expires", 0); String jsonpCallback = httpReq.getParameter("callbackFunction");//jsonp回调函数名 JSONObject resultJson = new JSONObject(); PrintWriter out = null; try { out = response.getWriter(); } catch (IOException e1) { e1.printStackTrace(); } try { node.setRowStart((node.getPage() - 1) * node.getRows() + 1); node.setRowEnd(node.getPage() * node.getRows()); resultJson.put("transportList", JsonUtils.toJSONList(business.getList(node))); resultJson.put("success", true); System.out.println(resultJson.toString()); out.println(jsonpCallback+"("+resultJson.toString()+")");//返回jsonp格式数据 out.flush(); out.close(); } catch (Exception e) { LogWriter.log("/pagelist/jsonp",e); try { resultJson.put("success", false); } catch (JSONException e1) { e1.printStackTrace(); } out.println(jsonpCallback+"("+resultJson.toString()+")");//返回jsonp格式数据 out.flush(); out.close(); }
注意要点:
1.设置响应报文头,response.setHeader("Content-type", "application/x-javascript;charset=utf-8");,消除了"Resource interpreted as Script but transferred with MIME type text/plain",同时要根据自己的编码格式设置正确的编码;
2.jsonp的数据格式是:jsonpCallback+"("+resultJson.toString()+")"
举个例子:
jsonpCallback({
"code": "aaa",
"price": 1780,
"tickets": 5
});
ajax跨域请求--jsonp实例
时间: 2024-10-27 00:30:19