1.post请求方式一，指定contentType

contentType为application/json时，data的类型要转换成json字符串的形式

$.ajax({
   type : "POST",
   url : "/mailbox/sendMail/resend",
   dataType : "json",
   data : JSON.stringify(ids),
   contentType:"application/json;charset=utf-8",
   success : function(d) {
     alert("成功");
   }
});

后台接收：要使用@RequestBody注解接收前端传递的参数

 @RequestMapping(value = "/resend", produces = "application/json;charset=utf-8")
 public @ResponseBody String resend(@RequestBody List<Long> ids) {
     return "success";
  }

 再如前端请求

	$.ajax({
				type : "post",
				url : "/intelligentAllocate/createAllocateDemand",
				data : JSON.stringify(obj),
				contentType:'application/json;charset=utf-8',
				dataType : "json",
				success : function(data) {
		
				}
			});

后台接收

@RequestMapping(value = "/createAllocateDemand", produces = "application/json;charset=utf-8")
	public @ResponseBody String createAllocateDemand(@RequestBody AllocateDemandPoJo demandPoJo) {
		Result result = this.getResult();
		try{
			try {
				User user = this.getLoginUser();
				demandPoJo.setCode(orderNumberService.nextOrderCode(OrderType.DB.name(), user));
				demandPoJo.setType("SALE");
				long num = allocateDemandService.add(demandPoJo, user);
				if(num>0){//添加成功
					result.setCode(ResultStatus.SUCCESS);
				}else{//添加失败
					result.setCode(ResultStatus.FALSE);
				}
			} catch (Exception e) {
				e.printStackTrace();
				result.setCode(ResultStatus.ERROR);
			}
		} catch (ServiceException e) {
			e.printStackTrace();
			result.setCode(ResultStatus.FALSE);
			result.addMsg(e.getMsg());
		} catch(Exception e){
			e.printStackTrace();
		}
		return this.getI18nResult(result);
	}

2.post请求方式二：$.post() 方法使用 HTTP POST 请求从服务器加载数据。

请求的参数是json对象类型

Content-Type:application/x-www-form-urlencoded; charset=UTF-8

$.post(
"/amazonReport/reportSearch/1/50", 
{ name: "John", time: "2pm" }, 
function(data) {
   console,log(data);
 });

后台接收

@RequestMapping(value = "/reportSearch/{pageNum}/{pageSize}", produces = "application/json;charset=utf-8")
	public ModelAndView reportSearch(AmazonReportRequestInfo amazonReportRequestInfo, HttpServletRequest request, HttpSession session,
									 Boolean defaultSearch) {
        return null;
}

3.如果前端使用 $.post()方式提交请求  ，data所传数据类型为json字符串,后端使用@RequestBody接收请求参数时会报错

 Failed to load resource: the server responded with a status of 415 (Unsupported Media Type)

使用post方式提交请求 使用方式1  或者方式2  ，混合使用会导致3这种报错