//属性要与带转化的对象属性对应
var param={name:'语文',price:16};

$.ajax({
    url: "/book/adddata",
    type: "POST",
    dataType: 'json',
    //必需设定，后台@RequestBody会根据它做数据反序列化
    contentType:"application/json",
    //必需把JSON数据以字符串的格式提交
    data:JSON.stringify(param),
    success: function (data) {
       alert('添加成功');
    },
    error: function (XMLHttpRequest, textStatus) {
        alert('添加失败');
    }
});

    @RequestMapping(value="adddata")
    @ResponseBody
    public  Protocol addData(Model model, @RequestBody Book book) {
        Book reData = bookService.add(book);
        return reData;
    }