SSM controller解决ajax跨域问题(不用jsonp)

@RequestMapping("/test")
@ResponseBody
public Json getCaptchaSrc(HttpServletRequest request, HttpServletResponse response) {
    response.setHeader("Access-Control-Allow-Origin", "*");
    Json data = new Json();
    data.append("code","200");
    return data;
}

前端正常ajax访问

function test(){
    $.ajax({
        url:"/test",
        type:"get",
        dataType:"json",
        success:function(res){
            console.log(res);
        },
        error:function(err){
            console.log(err);
        }
    })
}

请求