前端:后台有时候的得不到传来的参数,在ajax里加上data{"jsonpCallback":jsonpCallback}
$.ajax({
type:'POST',
url: 'www.xxx.com/goods/countGoodsNumByCategoryId.json',
data:{"categoryId":id},
dataType:'jsonp',
async:false,
jsonp:'jsonpCallback',//传递给后台程序,用来获取jsonp回调函数名的参数名
success:function(data){
var isExistGoods = data.isExistGoods;
var isNeedChooseCategory = data.isNeedChooseCategory;
if(isExistGoods == 1){
alertMsg.error("该类目下已存在商品,不能删除!");
}
if(isNeedChooseCategory == 1){
alertMsg.error("请选择一个类目!");
}
},
error:function(){
alertMsg.error("该类目下已存在商品,不能删除!");
}
});
$.ajax({
type : "GET",//请求方式 get/post
url : "http://" + tomcatBase + "/ilive/app/room/vod/checklogin.jspx",
dataType : "jsonp",
jsonp : "callback",
cache : false,
data : {
fileId:fileId,
roomId:roomId
},
success : function(data) {
后台:
@RequestMapping({ "/countGoodsNumByCategoryId.json" })
public void countGoodsNumByCategoryId(HttpServletRequest request, HttpServletResponse response) {
response.setContentType("text/plain");
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
Map<String, Object> paramsMap = new HashMap<String, Object>();
Long categoryId = null;
Map<String, Object> resultMap = new HashMap<String, Object>();
String categoryIdJson = request.getParameter("categoryId");
if (StringUtils.isNotBlank(categoryIdJson)) {
categoryId = Long.parseLong(categoryIdJson);
paramsMap.put("categoryId", categoryId);
int goodsNum;
try {
goodsNum = goodsService.selectCount(paramsMap);
if (goodsNum > 0) {
resultMap.put("isExistGoods", BoolStatus.YES);
} else {
resultMap.put("isExistGoods", BoolStatus.NO);
}
} catch (ServiceException e) {
LOG.error(e.getMessage(), e);
resultMap.put("isExistGoods", BoolStatus.YES);
}
} else {
resultMap.put("isNeedChooseCategory", BoolStatus.YES);
}
try {
PrintWriter out = response.getWriter();
JSONObject resultJSON = JSONObject.fromObject(resultMap); // 根据需要拼装json
String jsonpCallback = request.getParameter("jsonpCallback");// 客户端请求参数
out.println(jsonpCallback + "(" + resultJSON.toString(1, 1) + ")");// 返回jsonp格式数据
out.flush();
out.close();
} catch (IOException e) {
LOG.error(e.getMessage(), e);
}
}