Spring MVC 控制器映射不起作用

【问题标题】：Spring MVC Controller mapping does not workSpring MVC 控制器映射不起作用
【发布时间】：2017-04-07 01:48:13
【问题描述】：

我正在开发一个 spring-mvc 项目。经过多次尝试，我无法在春天映射控制器。因此，下面的 url 总是返回 404 not found。

http://localhost:8080/EcommerceBookStore/rest/welcome

这里是 web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>EcommerceBookStore</display-name>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>

  </welcome-file-list>
  
    <context-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>
                /WEB-INF/applicationContext.xml,
                /WEB-INF/Ecommerce-servlet.xml
            </param-value>
    </context-param>
    
 	<servlet>
        <servlet-name>Ecommerce</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>Ecommerce</servlet-name>
        <url-pattern>/rest/</url-pattern>
    </servlet-mapping>
   
   

  
<!--  <servlet>
    <servlet-name>Ecommerce</servlet-name>
    <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
    <init-param>
        <param-name>com.java.Client</param-name>
        <param-value>com.java.Client</param-value>
    </init-param>
    <init-param>
    	<param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name>
    	<param-value>true</param-value>
  	</init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>-->
  
  
</web-app>

这里是 Ecommerce-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">

	
	
	<mvc:default-servlet-handler/>
	
    <mvc:annotation-driven>
        <mvc:argument-resolvers>
            <bean class="org.springframework.security.web.bind.support.AuthenticationPrincipalArgumentResolver" />
        </mvc:argument-resolvers>
    </mvc:annotation-driven>

    <!-- bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WebContent" />
        <property name="suffix" value=".jsp" />
    </bean-->
	<bean id="viewResolver"
		class="org.springframework.web.servlet.view.UrlBasedViewResolver">
		<property name="viewClass"
			value="org.springframework.web.servlet.view.JstlView" />
		<property name="prefix" value="/WEB-INF/jsp/" />
		<property name="suffix" value=".jsp" />
	</bean>
    <mvc:annotation-driven />
    <context:component-scan base-package="com.webspider"/>
	
    <mvc:resources mapping="/Resources/**" location="/Resources/" />
   

</beans>

这里是

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:security="http://www.springframework.org/schema/security"
       xmlns:webflow-config="http://www.springframework.org/schema/webflow-config"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security.xsd http://www.springframework.org/schema/webflow-config http://www.springframework.org/schema/webflow-config/spring-webflow-config.xsd">

	<bean class="org.springframework.jdbc.datasource.DriverManagerDataSource"
		id="dataSource">
		<property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
		<property name="url" value="jdbc:mysql://localhost:3306/Ecommerce"></property>
		<property name="username" value="root"></property>
		<property name="password" value="pass"></property>
	</bean>
	
    <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean" >
        <property name="dataSource" ref="dataSource"></property>
        <property name="hibernateProperties" >
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
                <prop key="hibernate.hbm2ddl.auto">update</prop>
                <prop key="hibernate.show_sql">true</prop>
                <prop key="hibernate.format_sql">true</prop>
            </props>
        </property>
        <property name="packagesToScan">
            <list>
                <value>com.webspider</value>
            </list>
        </property>
    </bean>

    <bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
    </bean>

    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="maxUploadSize" value="10240000" />
    </bean>

    <security:http auto-config="true">
        <security:intercept-url pattern="/admin/**" access="ROLE_ADMIN" />
        <security:intercept-url pattern="/customer/**" access="ROLE_USER" />
        <security:form-login
            login-page="/login"
            default-target-url="/product/productList"
            authentication-failure-url="/login?error"
            username-parameter="username"
            password-parameter="password" />
        <security:logout
            logout-success-url="/login?logout" />
    </security:http>

    <security:authentication-manager>
        <security:authentication-provider>
            <security:jdbc-user-service
                    data-source-ref="dataSource"
                    authorities-by-username-query="SELECT username, authority FROM authorities WHERE username = ?"
                    users-by-username-query="SELECT username, password, enabled FROM users WHERE username = ?" />
        </security:authentication-provider>
    </security:authentication-manager>

    <webflow-config:flow-executor id="flowExecutor" flow-registry="flowRegistry" />
    
    <webflow-config:flow-registry id="flowRegistry" base-path="/WEB-INF/flows">
        <webflow-config:flow-location path="/checkout/checkout-flow.xml" id="checkout" />
    </webflow-config:flow-registry>

    <bean id="flowHandlerMapping" class="org.springframework.webflow.mvc.servlet.FlowHandlerMapping">
        <property name="flowRegistry" ref="flowRegistry" />
    </bean>

    <bean id="flowHandlerAdapter" class="org.springframework.webflow.mvc.servlet.FlowHandlerAdapter">
        <property name="flowExecutor" ref="flowExecutor" />
    </bean>

</beans>

这里是 helloworld 控制器

    package com.webspider.Controller;


    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.servlet.ModelAndView;

   /*
    * author: Crunchify.com
    * 
    */

@Controller
public class HelloWorld {

    @RequestMapping("/welcome")
    public ModelAndView helloWorld() {

        String message = "<br><div style='text-align:center;'>"
                + "<h3>********** Hello World, Spring MVC Tutorial</h3>This message is coming from CrunchifyHelloWorld.java **********</div><br><br>";
        return new ModelAndView("welcome", "message", message);
    }
}

这是tomcat的输出

Nov 23, 2016 12:41:14 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dfile.encoding=UTF-8
Nov 23, 2016 12:41:14 AM org.apache.catalina.core.AprLifecycleListener lifecycleEvent
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: /Users/atishpatra/Library/Java/Extensions:/Library/Java/Extensions:/Network/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java:.
Nov 23, 2016 12:41:15 AM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-nio-8080"]
Nov 23, 2016 12:41:15 AM org.apache.tomcat.util.net.NioSelectorPool getSharedSelector
INFO: Using a shared selector for servlet write/read
Nov 23, 2016 12:41:15 AM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-nio-8009"]
Nov 23, 2016 12:41:15 AM org.apache.tomcat.util.net.NioSelectorPool getSharedSelector
INFO: Using a shared selector for servlet write/read
Nov 23, 2016 12:41:15 AM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 972 ms
Nov 23, 2016 12:41:15 AM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
Nov 23, 2016 12:41:15 AM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/8.0.38
Nov 23, 2016 12:41:18 AM org.apache.jasper.servlet.TldScanner scanJars
INFO: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
Nov 23, 2016 12:41:18 AM org.apache.catalina.core.ApplicationContext log
INFO: No Spring WebApplicationInitializer types detected on classpath
Nov 23, 2016 12:41:18 AM org.apache.catalina.core.ApplicationContext log
INFO: Initializing Spring FrameworkServlet 'Ecommerce'
Nov 23, 2016 12:41:18 AM org.springframework.web.servlet.FrameworkServlet initServletBean
INFO: FrameworkServlet 'Ecommerce': initialization started
Nov 23, 2016 12:41:18 AM org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing WebApplicationContext for namespace 'Ecommerce-servlet': startup date [Wed Nov 23 00:41:18 CST 2016]; root of context hierarchy
Nov 23, 2016 12:41:18 AM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from ServletContext resource [/WEB-INF/Ecommerce-servlet.xml]
Nov 23, 2016 12:41:19 AM org.springframework.beans.factory.support.DefaultListableBeanFactory registerBeanDefinition
INFO: Overriding bean definition for bean 'org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping' with a different definition: replacing [Root bean: class [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null] with [Root bean: class [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null]
Nov 23, 2016 12:41:19 AM org.springframework.beans.factory.support.DefaultListableBeanFactory registerBeanDefinition
INFO: Overriding bean definition for bean 'org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter' with a different definition: replacing [Root bean: class [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null] with [Root bean: class [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null]
Nov 23, 2016 12:41:19 AM org.springframework.beans.factory.support.DefaultListableBeanFactory registerBeanDefinition
INFO: Overriding bean definition for bean 'mvcUriComponentsContributor' with a different definition: replacing [Root bean: class [org.springframework.web.servlet.config.AnnotationDrivenBeanDefinitionParser$CompositeUriComponentsContributorFactoryBean]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null] with [Root bean: class [org.springframework.web.servlet.config.AnnotationDrivenBeanDefinitionParser$CompositeUriComponentsContributorFactoryBean]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null]
Nov 23, 2016 12:41:19 AM org.springframework.web.servlet.handler.AbstractUrlHandlerMapping registerHandler
INFO: Mapped URL path [/**] onto handler 'org.springframework.web.servlet.resource.DefaultServletHttpRequestHandler#0'
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Nov 23, 2016 12:41:20 AM org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter initControllerAdviceCache
INFO: Looking for @ControllerAdvice: WebApplicationContext for namespace 'Ecommerce-servlet': startup date [Wed Nov 23 00:41:18 CST 2016]; root of context hierarchy
Nov 23, 2016 12:41:20 AM org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter initControllerAdviceCache
INFO: Looking for @ControllerAdvice: WebApplicationContext for namespace 'Ecommerce-servlet': startup date [Wed Nov 23 00:41:18 CST 2016]; root of context hierarchy
Nov 23, 2016 12:41:20 AM org.springframework.web.servlet.handler.AbstractUrlHandlerMapping registerHandler
INFO: Mapped URL path [/Resources/**] onto handler 'org.springframework.web.servlet.resource.ResourceHttpRequestHandler#0'
Nov 23, 2016 12:41:20 AM org.springframework.web.servlet.FrameworkServlet initServletBean
INFO: FrameworkServlet 'Ecommerce': initialization completed in 2089 ms
Nov 23, 2016 12:41:21 AM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-nio-8080"]
Nov 23, 2016 12:41:21 AM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-nio-8009"]
Nov 23, 2016 12:41:21 AM org.apache.catalina.startup.Catalina start
INFO: Server startup in 5855 ms

我在 tomcat 输出中没有看到任何错误。我预计会出现类似的东西

INFO：将 URL 路径 [/welcome] 映射到处理程序 HelloWorld。

我不知道出了什么问题。谁能指出我错过了什么？

提前致谢。

【问题讨论】：

  • 你试过http://localhost:8080/rest/welcome吗？您是否查看过 Tomcat 的管理 webapp 以查看映射了哪些 URL？
  • 你在tomcat中webapps文件夹下的项目名称是什么？
  • 你有没有考虑过使用 Spring Boot，它会消除大约 90% 的问题？
  • 我试过 localhost:8080/rest/welcome 。找不到相同的 404
  • 如何访问Tomcat的管理webapp？ localhost:8080/manager/html - 不起作用

标签： java spring spring-mvc tomcat web-applications


【解决方案1】：

我想你在这里混了：

如果您的项目名称是 rest，并且您将其部署为 rest.war，那么您不需要 web.xml 中的这一行

<url-pattern>/rest/</url-pattern>

改成

<url-pattern>/</url-pattern>

但是如果您使用 ROOT.war 运行它并且您希望 /rest 在 url 中，那么您必须执行以下操作：

@Controller
@RequestMapping("/rest")
public class HelloWorld {

然后使用以下网址访问： localhost:8080//休息/欢迎

【讨论】：

  • 项目名称是 EcommerceBookStore。
  • 项目名称表示当您构建项目时，war 文件名是什么？
  • war 文件名为 EcommerceBookStore。在我从 url-pattern 中删除 /rest 并按照 url localhost:8080/EcommerceBookStore/welcome 执行后，我在 tomcat 日志中收到以下错误。 org.springframework.web.servlet.DispatcherServlet noHandlerFound 警告：在 DispatcherServlet 中找不到带有 URI [/EcommerceBookStore/welcome] 的 HTTP 请求的映射，名称为“Ecommerce”
  • 看，如果你的战争文件名是 EcommerceBookStore.war 然后把 /EcommerceBookStore 放在 localhost:8080 之后，如果你的战争文件名是 rest.war 然后把 /rest 放在 localhost:8080 之后，如果你的战争文件名是 ROOT.war 然后不要在 localhost:8080 之后放任何东西。
  • 请忽略 /rest。在您对尝试发表评论后，我已将其删除。我的战争文件名是 EcommerceBookStore.war。这就是为什么我正在执行以下 url localhost:8080/EcommerceBookStore/welcome 并在 tomcat org.springframework.web.servlet.DispatcherServlet noHandlerFound 警告中出现以下错误：没有为带有 URI ** ** 的 HTTP 请求找到映射 [/ DispatcherServlet 中的 EcommerceBookStore/welcome]，名称为“电子商务” 有什么提示吗？
【解决方案2】：

尝试关注，

@RequestMapping("/welcome", method = RequestMethod.GET)
public ModelAndView helloWorld() {...

确保您的映射是，

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

将您的默认 servlet 名称自定义为，

 <mvc:default-servlet-handler default-servlet-name="Ecommerce"/>

试用网址：localhost:8080/Ecommerce/welcome

【讨论】：

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