java 如何为 spring 配置 web.xml
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how to configure web.xml for spring
提问by Muhammad
I am new to spring Framework and having problem with linking/configuring springframework through web.xml. I am getting below error when running my app.
我是 spring 框架的新手，在通过 web.xml 链接/配置 springframework 时遇到问题。运行我的应用程序时出现以下错误。
Error:
错误：
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)
Apparently, it could not find class org.springframework.web.servlet.DispatcherServlet in the Libraries. However, I dont know how to tell web.xml where to look for this class.
显然，它在库中找不到类 org.springframework.web.servlet.DispatcherServlet。但是，我不知道如何告诉 web.xml 在哪里查找此类。
web.xml
网页.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
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>
回答by Tomasz Nurkiewicz
java.lang.ClassNotFoundException: org.springframework.web.servlet.DispatcherServlet
java.lang.ClassNotFoundException: org.springframework.web.servlet.DispatcherServlet
You must add spring-webmvc.jarto your CLASSPATH (most likely to /WEB-INF/libdirectory). The rest of your configuration seems fine.
您必须添加spring-webmvc.jar到您的 CLASSPATH（最有可能添加到/WEB-INF/lib目录）。您的其余配置似乎没问题。
