springmvc-ajax json对象 用Map接受

https://www.cnblogs.com/wqsbk/p/6884723.html 

几个需要的jar包

http://mvnrepository.com/search?q=jackson

ajax传json对象

ContentType: 'application/json; charset=utf-8', 表示data的类型是json

var myData = {styleNum : "styleNum", moldPart:"moldPart"};    //myData 存放数据

$.ajax({
    url: getPath()+'/dropdown/selectanwithsm.action',
    type: 'post',
    data: myData,    //ajax 传输
    dataType: 'json',
    ContentType: 'application/json; charset=utf-8',
})

springMVC接受

@RequestParam: 如果想参数封装到Map中需要这个注解

@ResponseBody: 作用在 return 一个json对象, 前台能用ajax接收

@RequestMapping(value="/selectanwithsm", method=RequestMethod.POST)
@ResponseBody
public List<Map<String, Object>> selectANWithSM(@RequestParam Map<String, Object> m){
	System.out.println("\n\n\n\n\n"+m.get("styleNum"));
//	return dds.selectANWithSM();
	return null;
}