HTTP状态404-找不到页面。SpringMVC错误

Question

这是我在SpringMVC中使用Maven的第一个应用程序。下面是应用程序结构。

控制器代码：

当我点击index.jsp中的链接时，页面应该被遍历到helloworld.jsp

    <h3>
        <a href="hello?name=Eric">Click Here</a>
    </h3>

    <h2>
        ${message} ${name}
    </h2>

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

  <modelVersion>4.0.0</modelVersion>
 <groupId>demoproject</groupId>
 <artifactId>demoMVC</artifactId>

 <packaging>war</packaging>
 <version>0.0.1-SNAPSHOT</version>
 <name>demoMVC Maven Webapp</name>
 <url>http://maven.apache.org</url>
 <properties>
    <spring.version>4.0.1.RELEASE</spring.version>
 </properties>
<dependencies>
 <dependency>
  <groupId>junit</groupId>
  <artifactId>junit</artifactId>
  <version>3.8.1</version>
  <scope>test</scope>
</dependency>
<dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>${spring.version}</version>
    </dependency>

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>${spring.version}</version>
    </dependency>

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>${spring.version}</version>
    </dependency>
  </dependencies>
 <build>
   <finalName>demoMVC</finalName>
    <directory>${basedir}/target</directory>  
       <plugins>  
            <plugin>  
                 <groupId>org.apache.maven.plugins</groupId>  
                 <artifactId>maven-compiler-plugin</artifactId>  
                 <version>3.3</version>  
                 <configuration>  
                      <source>1.8</source>  
                      <target>1.8</target>  
                      <showWarnings>true</showWarnings>  
                 </configuration>  
            </plugin>  
       </plugins>  
     </build>
   </project>

  WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting    property 'source' to 'org.eclipse.jst.jee.server:demoMVC' did not find a matching property.
  Mar 31, 2017 1:22:08 PM org.apache.coyote.AbstractProtocol init
  INFO: Initializing ProtocolHandler ["http-bio-8080"]
  Mar 31, 2017 1:22:08 PM org.apache.coyote.AbstractProtocol init
  INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
  Mar 31, 2017 1:22:08 PM org.apache.catalina.startup.Catalina load
  INFO: Initialization processed in 1005 ms
  Mar 31, 2017 1:22:08 PM org.apache.catalina.core.StandardService startInternal
  INFO: Starting service Catalina
   Mar 31, 2017 1:22:08 PM org.apache.catalina.core.StandardEngine startInternal
   INFO: Starting Servlet Engine: Apache Tomcat/7.0.34
   Mar 31, 2017 1:22:12 PM org.apache.catalina.core.ApplicationContext log
   INFO: No Spring WebApplicationInitializer types detected on classpath
   Mar 31, 2017 1:22:12 PM org.apache.coyote.AbstractProtocol start
   INFO: Starting ProtocolHandler ["http-bio-8080"]
   Mar 31, 2017 1:22:12 PM org.apache.coyote.AbstractProtocol start
  INFO: Starting ProtocolHandler ["ajp-bio-8009"]
   Mar 31, 2017 1:22:12 PM org.apache.catalina.startup.Catalina start
   INFO: Server startup in 3739 ms

Answer 1

在日志中，您应该看到如下内容：

19:05:56,530 INFO  [io.undertow.servlet] (ServerService Thread Pool -- 106) Initializing Spring FrameworkServlet 'mvc-dispatcher'
19:05:56,531 INFO  [org.springframework.web.servlet.DispatcherServlet] (ServerService Thread Pool -- 106) FrameworkServlet 'mvc-dispatcher': initialization started
19:05:56,547 INFO  [org.springframework.web.context.support.XmlWebApplicationContext] (ServerService Thread Pool -- 106) Refreshing WebApplicationContext for namespace 'mvc-dispatcher-servlet': startup date [Fri Mar 31 19:05:56 UTC 2017]; root of context hierarchy
19:05:56,584 INFO  [org.springframework.beans.factory.xml.XmlBeanDefinitionReader] (ServerService Thread Pool -- 106) Loading XML bean definitions from ServletContext resource [/WEB-INF/mvc-dispatcher-servlet.xml]
19:05:56,741 INFO  [org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor] (ServerService Thread Pool -- 106) JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
19:05:56,859 INFO  [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping] (ServerService Thread Pool -- 106) Mapped "{[/hello],methods=[],params=[],headers=[],consumes=[],produces=[],custom=[]}" onto protected org.springframework.web.servlet.ModelAndView com.crramirez.HelloWorldController.showMessage(java.lang.String) throws java.lang.Exception
19:05:57,084 INFO  [org.springframework.web.servlet.DispatcherServlet] (ServerService Thread Pool -- 106) FrameworkServlet 'mvc-dispatcher': initialization completed in 553 ms

删除web.xml中的这些行：

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/dispatcher-servlet.xml</param-value>
</context-param>

<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

并将WEB-INF中的文件从dispatcher-servlet.xml重命名为mvc-dispatcher-servlet.xml