想实现spring返回一个json串，结果总是显示404

浏览器地址输入http://localhost:8080/spring-test/doGetUser.do。
错误是：HTTP Status 404 - /spring-test/WEB-INF/{"id":1,"name":"Li","age":45,"salary":3000.0,"hiredate":1509033600000}.jsp

type Status report

message /spring-test/WEB-INF/{"id":1,"name":"Li","age":45,"salary":3000.0,"hiredate":1509033600000}.jsp

description The requested resource is not available.

Apache Tomcat/7.0.67：。怎么解决？