【异常】ajax请求成功，后台方法也执行成功，却报404

错误信息：responseText: "

HTTP Status 404 - /WEB-INF/pages/[{"fieldName":"姓名","fileId":31,"id":77,"status":"0"},{"fieldName":"密码","fileId":31,"id":78,"status":"0"},{"fieldName":"账号","fileId":31,"id":79,"status":"0"}].jsp

---

type Status report

message /WEB-INF/pages/[{"fieldName":"姓名","fileId":31,"id":77,"status":"0"},{"fieldName":"密码","fileId":31,"id":78,"status":"0"},{"fieldName":"账号","fileId":31,"id":79,"status":"0"}].jsp

description The requested resource is not available.

---

Apache Tomcat/7.0.67

"

错误描述 ：ajax 请求 明明后台代码已经执行 并返回了json  却 一直跳到error

经分析是请求没有返回状态码，这是因为我用的是SpringMVC框架，前后端使用JSON传递数据，因为返回的是对象，而忘记了添加

@ResponseBody  或者 @RestController

注解，所以 Spring对我的返回值进行了映射，但是映射结果又对应不到视图，所以返回了404