Spring MVC 子映射 @RequestMapping 抛出 404答案

【问题标题】：Spring MVC sub mapping @RequestMapping throws 404Spring MVC 子映射 @RequestMapping 抛出 404
【发布时间】：2019-01-07 03:32:31
【问题描述】：

大方一点，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。我设置了一个父映射@“/hello”并子映射了一个方法@“/showForm”，调度程序设置为“/”但我得到404 （参见代码图3 )。对于我的类似问题，我找不到答案。

请参阅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：忘记了豆图。 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（我知道混乱）

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....

【问题讨论】：

看看stackoverflow.com/questions/43186315/…
我在底部添加了结构树，看看。之前看过，没有解决我的问题。一切正常 - 我可以访问 idnex.jsp，它只是索引上的映射链接不起作用。我将在一秒钟内编辑索引
也发布你的 pom.xml
已发布，请参阅编辑。 --- 我主要关心的是 - index.jsp 按预期工作，showForm 也是如此，但是一旦我映射类以将其设置为父级，它就会变成梨形
Georges，我正在查看错误 /yktech/hello/WEB-INF/view/hello-world.jsp 不应该是 /yktech/web-inf/view/hello/hello-world .jsp ?

标签： spring spring-mvc web.xml spring-annotations tomcat9

【解决方案1】：

试试这个：对/hello 的请求将由whatever() 处理，而对/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";
        }

【讨论】：

没什么，再说一遍。完全迷路了......类型状态报告消息/yktech/hello/WEB-INF/view/helloworld.jsp 描述源服务器没有找到目标资源的当前表示或不愿意透露存在的表示跨度>

【解决方案2】：

问题在于视图解析器 bean，前缀开头没有“/”，导致 Spring 从根而不是 /WEB-INF/view 调用任何父映射请求

【讨论】：