java - 如何修复找不到 Spring DispatcherServlet 类？

Question

我开始学习 Spring，所以我尝试使用 Spring MVC 创建一些简单的应用程序。看了很多命题怎么修复这个错误，但是还是没有解决。请问如果有人知道什么，你能帮忙吗？因为我已经花了很多时间，仍然不知道如何解决它。
所以在索引页上我创建了下一个链接:

 <a href="${pageContext.servletContext.contextPath}/sign/up">Sign up</a>

必须将我引向注册页面。 我有 hibernate.cfg.xml 文件，我用它在 spring-context.xml 中配置 LocalSessionFactoryBean。一般 spring-context.xml 看起来像:

<beans 
    xmlns="http://www.springframework.org/schema/beans"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:security="http://www.springframework.org/schema/security"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
        http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security-3.0.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

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

    <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    <property name="configLocations">
        <value>classpath:resources/hibernate.cfg.xml</value>
    </property>
    </bean>

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

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

    <context:annotation-config/>
    <context:component-scan base-package="milkiv.easyword"/>
    <tx:annotation-driven/>
</beans>

web.xml 喜欢:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee">
    <servlet>
    <servlet-name>appServlet</servlet-name>
    <servlet-class>>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:/resources/spring-context.xml</param-value>
    </init-param>
    </servlet>

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

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

    <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:/resources/spring-context.xml</param-value>
    </context-param>
</web-app>

我的 Controller 看起来像:

@RequestMapping("/sign/up")
@Controller
public class Up {

    @RequestMapping(method = RequestMethod.GET)
    public String showForm(ModelMap map) {
    return "sign/up";
    }

    @RequestMapping(method = RequestMethod.POST)
    public String signUp(@ModelAttribute User user) {
    if (user != null) {
        user.setRegistrationDate(new Date(new java.util.Date().getTime()));
        ApplicationContext context = new ClassPathXmlApplicationContext("resources/spring-context.xml");
        Storages storages = context.getBean(Storages.class);
        storages.uSM.create(user);
    }
    return "sign/up";
    }
}

所以我有下一个问题。当我按下链接时，它会向我推荐 EasyWordWeb/sign/up 并给出下一个异常:

type Exception report

message Error instantiating servlet class >org.springframework.web.servlet.DispatcherServlet

description The server encountered an internal error that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Error instantiating servlet class >org.springframework.web.servlet.DispatcherServlet
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:673)
    org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
    org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456)
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    java.lang.Thread.run(Thread.java:745)
root cause

java.lang.ClassNotFoundException: >org.springframework.web.servlet.DispatcherServlet
    org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1333)
    org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1167)
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:673)
    org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
    org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456)
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    java.lang.Thread.run(Thread.java:745)

P.S.DispatcherServlet实际所在的jar文件(spring-webmvc-4.2.0.RELEASE.jar)在WEB-INF/lib/目录下。

Answer 1

请在删除 web.xml 文件中多余的“>”后尝试。这可能是导致它的原因。

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