Spring MVC 子映射 @RequestMapping 抛出 404

Question

请大方告诉我们为什么我会遇到这个愚蠢的问题

没有映射一切正常！但我有一个简单的问题。我已经设置了一个父映射@“/hello”并子映射了一个方法@“/showForm”，Dispatcher 设置为“/”但我得到 404(参见代码图 3)。我找不到与我的相似问题的答案。

查看下面的代码和我的设置的标签

控制器图 1

   @Controller
    @RequestMapping("/hello")
    public class HelloWorldController {



        @RequestMapping("/showForm")
        public String showForm() {
            return "hello-world";
        }

web.xml 图2

<servlet>
    <servlet-name>yktech</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>yktech</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>

Tomcat 错误图3

Type Status Report

Message /yktech/hello/WEB-INF/view/hello-world.jsp

Description The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.

编辑：忘记了 BEAN 图。 4

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="WEB-INF/view/"/>
<property name="suffix" value=".jsp"/>
</bean>

编辑：结构树（我知道很乱）

enter image description here

编辑 4 , index.jsp

<html>
<body>
<h2>Welcome to my homepage
</h2>
<a href="hello/showForm">Show form</a>

<a href="Student/showForm">Show STUDENT form</a>
</body>
</html>

编辑 5 pom.xml

<project
 xmlns="http://maven.apache.org/POM/4.0.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

  <modelVersion>4.0.0</modelVersion>
  <groupId>com.yktech</groupId>
  <artifactId>yktech</artifactId>
  <packaging>war</packaging>
  <version>1.0</version>
  <name>yktech</name>
  <url>http://maven.apache.org</url>


  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>4.3.17.RELEASE</version>
</dependency>

 <dependency>
        <groupId>commons-logging</groupId>
        <artifactId>commons-logging</artifactId>
        <version>1.2</version>
     </dependency>    
  </dependencies>
  <build>
    <finalName>yktech</finalName>
  </build>
</project>

编辑 6，服务器日志，映射 URL

INFO: Loading XML bean definitions from ServletContext resource [/WEB-INF/yktech-servlet.xml]
Jul 30, 2018 10:19:30 PM org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping registerHandler
INFO: Mapped URL path [/hello/processForm] onto handler 'helloWorldController'
Jul 30, 2018 10:19:30 PM org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping registerHandler
INFO: Mapped URL path [/hello/processForm.*] onto handler 'helloWorldController'
Jul 30, 2018 10:19:30 PM org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping registerHandler
INFO: Mapped URL path [/hello/processForm/] onto handler 'helloWorldController'
Jul 30, 2018 10:19:30 PM org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping registerHandler
INFO: Mapped URL path [/hello/processFormVersionTwo] onto handler 'helloWorldController'
Jul 30, 2018 10:19:30 PM org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping registerHandler
INFO: Mapped URL path [/hello/processFormVersionTwo.*] onto handler 'helloWorldController'
Jul 30, 2018 10:19:30 PM org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping registerHandler
INFO: Mapped URL path [/hello/processFormVersionTwo/] onto handler 'helloWorldController'
Jul 30, 2018 10:19:30 PM org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping registerHandler
INFO: Mapped URL path [/hello/showForm] onto handler 'helloWorldController'
Jul 30, 2018 10:19:30 PM org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping registerHandler
INFO: Mapped URL path [/hello/showForm.*] onto handler 'helloWorldController'
Jul 30, 2018 10:19:30 PM org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping 

registerHandler
    INFO: Mapped URL path [/hello/showForm/] onto handler 'helloWorldController'

... CARRIES ON SHOWS NO ERRORS....

Answer 1

试试这个： /hello 的请求将由 whatever() 处理，而 /hello/showForm 的请求将由 showForm()

处理

@Controller
    @RequestMapping("/hello")
    public class HelloWorldController {

@RequestMapping("/")
        public String whatever() {
            return "whatever";
        }

        @RequestMapping("/showForm")
        public String showForm() {
            return "hello-world";
        }

Answer 2

问题出在视图解析器 bean 中，前缀在开头没有“/”导致 Spring 从根而不是从 /WEB-INF/view

调用任何父级映射请求

Spring MVC 子映射 @RequestMapping 抛出 404

Spring MVC sub mapping @RequestMapping throws 404

spring

web.xml

spring-mvc

spring-annotations

tomcat9