SpringBoot 出现 Content type 'application/x-www-form-urlencoded;charset=UTF-8' not supported

传参数，后台@RequestBody接收实体，报错：Content type 'application/x-www-form-urlencoded;charset=UTF-8' not supported

解决方案：添加**的内容，既可以解决问题

    function saveProjectSalary() {
        $.ajax({
            url: '<%=basePath%>/projectSalary/saveProjectSalary',
            type: 'post',
            **data: JSON.stringify($("#projectSalaryForm").serialize()),**
            **contentType:"application/json",**
            dataType: "json",
            success: (result) => {
                if (result.code == '200') {
                    alert(result)
                }
            },
            error: (e) => {
                alert(e);
            }
        });
    }