c:/jdk/bin;.;c:/jdk/lib

c:/jdk/bin;.;c:/jdk/lib/dt.jar;c:/jdk/lib/tools.jar

public class helloworld{public static void main(string[] args){system.out.println("hello,world!");}}

javac helloworld.javajava helloworld

c:/tomcat

java_home: c:/jdktomcat_home: c:/tomcatclasspath: %java_home%/lib;%tomcat_home%/lib

import java.io.*;import javax.servlet.*;import javax.servlet.http.*;public class helloworld extends httpservlet{public void doget(httpservletrequest request,httpservletresponse response)throwsservletexception,ioexception{response.setcontenttype("text/html"); printwriter out = response.getwriter();out.println("＜html＞＜head＞＜title＞");out.println("this is my first servlet");out.println("＜/title＞＜/head＞＜body＞");out.println("＜h1＞hello,world!＜/h1＞");out.println("＜/body＞＜/html＞");}}

root/index.htmlroot/welcom.jsproot/web-inf/lib/myservlet.jar（如果你的servlet的.class打成了.jar文件，則放在lib下面)root/web-inf/classes/helloworld.class(把上面生成的helloworld.class文件放在這個(gè)里面)

error 404--not found

＜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＞

＜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＞