你在xml文件中配置了servlet没有?

解决方案 »

  1.   

    <?xml version="1.0" encoding="ISO-8859-1"?><!DOCTYPE web-app
        PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
        "http://java.sun.com/dtd/web-app_2_3.dtd"><web-app>
      <display-name>Welcome to SZCIC</display-name>
      <description>
         Welcome to SZCIC
      </description>
    <!-- JSPC servlet mappings start -->    <!--servlet>
            <servlet-name>org.apache.jsp.index_jsp</servlet-name>
            <servlet-class>org.apache.jsp.index_jsp</servlet-class>
        </servlet>    <servlet-mapping>
            <servlet-name>org.apache.jsp.index_jsp</servlet-name>
            <url-pattern>/index.jsp</url-pattern>
        </servlet-mapping--><!-- JSPC servlet mappings end --></web-app><servlet>
    <servlet-name>HelloWorld</servlet-name>
    <servlet-class>HelloWorld</servlet-class>
    </servlet>
    <servlet-mapping>
    <servlet-name>HelloWorld</servlet-name>
    <url-pattern>/servlet/helloworld</url-pattern>
    </servlet-mapping>