如何為 spring 配置 web.xml

Question

我是 spring 框架的新手，在通過 web.xml 鏈接/配置 springframework 時遇到問題。 運行我的應用程序時出現以下錯誤。

錯誤：

HTTP Status 500 - Error instantiating servlet class org.springframework.web.servlet.DispatcherServlet


    type Exception report

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

    description The server encountered an internal error (Error instantiating servlet class org.springframework.web.servlet.DispatcherServlet) 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:472)
        org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
        org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
        org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
        org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1001)
        org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)
        org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
        java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        java.lang.Thread.run(Unknown Source)


    root cause 

    java.lang.ClassNotFoundException: org.springframework.web.servlet.DispatcherServlet
        org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1711)
        org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1556)
        org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
        org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
        org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
        org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
        org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1001)
        org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)
        org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
        java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        java.lang.Thread.run(Unknown Source)

顯然，它在庫中找不到類 org.springframework.web.servlet.DispatcherServlet。 但是，我不知道如何告訴 web.xml 在哪里查找此類。

網頁.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" 
             xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" 
             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">

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

        <servlet-mapping>
            <servlet-name>DispatcherSample</servlet-name>
            <url-pattern>/PlayField.html</url-pattern>
        </servlet-mapping>

      <welcome-file-list>
        <welcome-file>index.html</welcome-file>
        <welcome-file>Welcome.html</welcome-file>
      </welcome-file-list>

    </web-app>

DispatcherSample-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"
        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

        <bean id="handlerMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">  
            <property name="mappings">
                <props>
                    <prop key="/PlayField.html">playfieldController</prop>
                </props>    
            </property>
        </bean>

        <bean id="playfieldController" class="demos.PlayfieldController"/>

    </beans>

Answer 1

java.lang.ClassNotFoundException: org.springframework.web.servlet.DispatcherServlet

您必須將spring-webmvc.jar添加到您的 CLASSPATH（最有可能添加到/WEB-INF/lib目錄）。 您的其余配置似乎沒問題。