我如何通过Ajax从Spring Controller获取数据？

Question

我ajax的jsp页面上有一个通过URL调用spring控制器的页面/check。

$.ajax({
    type : "GET",
    url : "${pageContext.request.contextPath}/check",
    data : {
    "id" : ${articleCount}
    },
    success: function(data){
    //response from controller
    }
});

现在，控制器看起来像

@RequestMapping("/check")
public String check(@RequestParam Integer id, HttpServletRequest request,
        HttpServletResponse response, Model model) {
    boolean a = getSomeResult();
    if (a == true) {
        model.addAttribute("alreadySaved", true);
        return view;
    } else
        model.addAttribute("alreadySaved", false);

    return view;
}

我发送的数据使用模式，并试图访问它success: function(data)的"${alreadySaved}"，但它显示为空白。

有什么方法可以true/false在查看页面上接收该数据？

Answer 1

您必须为Spring Ajax调用示例添加@ResponseBody批注

@RequestMapping("/check")     
@ResponseBody
public String check(@RequestParam Integer id, HttpServletRequest request, HttpServletResponse response, Model model) {
    boolean a = getSomeResult();
    if (a == true) {
        model.addAttribute("alreadySaved", true);
        return view;
    } else {
        model.addAttribute("alreadySaved", false);
        return view;
    }
}