java - 当子类在Spring MVC中扩展它时，我们可以从父类路径调用@RequestMapping吗？

Question

在一次采访中，我被问到一个问题；假设您有一个子 Controller ，它扩展了父 Controller ，如下面的代码所示，并且我们想要访问父类 @RequestMapping 方法。我们可以这样做吗？有什么办法吗？

当我尝试下面的代码并单击 BaseHello 链接时，我收到警告 -如果我在父类中写@Controller，那么也会出现相同的警告

May 09, 2020 2:18:53 PM org.springframework.web.servlet.DispatcherServlet noHandlerFound
WARNING: No mapping for GET /Projectname/parent/hello

Parent.java

package com.practice;

@RequestMapping("/parent")
public abstract class Parent {
    @RequestMapping("/hello")
    public String world() {
        return "hellopage";
    }
}

Child.java

package com.practice;
@Controller
@RequestMapping("/child")
public class Child extends Parent {
    @RequestMapping("/detail")
    public String info() {
        return "detailpage";
    }
}

index.jsp

<a href="parent/hello">BaseHello</a>
<a href="child/hello">ChildHello </a>
<a href="child/details">ChildDetails</a>

Answer 1

也许这会起作用:

//@RequestMapping("/parent") remove conflicts child path
public abstract class Parent {
    @RequestMapping("parent/hello")
    public String world() {
        return "hellopage";
    }}

@Controller 
// @RequestMapping("/child") // remove this, add child to the method, because abstract class already have one.
public class Child extends Parent {
    @RequestMapping("/child/detail")
    public String info() {
        return "detailpage";
    }}