您应该将servlet类放在包中。无包servlet是否起作用取决于旧版Tomcat和JVM版本的特定组合。如果您在书/教程中看到此示例，那么它肯定已经过时了。
package com.example;// ...public class Ch1Servlet extends HttpServlet { // ...}您应该有一个
/com/example/Ch1Servlet.java文件。编译如下
javac -classpath /usr/share/tomcat7/common/lib/servlet-api.jar -d classes src/com/example/Ch1servlet.java
(I however wonder what thecommon
lib is doing there, this was typical for
Tomcat 4.x/5.x, but it’s not present since Tomcat 6. If you manually changed
Tomcat’s structure in order to follow the instructions of an outdated
tutorial, undo it!)
Put the
comfolder with the generated class by its entirity in
/WEB-INF/classesfolder of your webapp. So you must have a
/WEB-INF/classes/com/example/Ch1Servlet.class.
Then, edit your
/WEB-INF/web.xmlto specify the fully qualified name (FQN)
of the servlet class in
<servlet-class>:
<?xml version="1.0" encoding="UTF-8"?><web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0" > <servlet> <servlet-name>Chapter1 Servlet</servlet-name> <servlet-class>com.example.Ch1Servlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>Chapter1 Servlet</servlet-name> <url-pattern>/Serv1</url-pattern> </servlet-mapping></web-app>
(please note that I fixed the root declaration as well to comply Tomcat 7
supported servlet version, it would otherwise fall back to least compatibility
modus)
