public class testservlet extends httpservlet {
　private static final string content_type = "text/html; charset=gbk";
　public void doget(httpservletrequest request, httpservletresponse response)
　throws servletexception, ioexception {
　　response.setcontenttype(content_type);
　　printwriter out = response.getwriter()

　　int n = 1;
　　for (int i = 1; i ＜= 5; i++) {
　　　n *= i;
　　}

　　out.println("＜html＞");
　　out.println("＜head＞＜title＞testservlet＜/title＞＜/head＞");
　　out.println("＜body＞");
　　out.println("＜p＞5! = " + n + "＜/p＞");
　　out.println("＜/body＞＜/html＞");
　　out.close();
　}
}

＜?xml version="1.0" encoding="utf-8"?＞
＜!doctype web-app public "-//sun microsystems, inc.//dtd web application 2.2//en" "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd"＞
＜web-app＞
　＜servlet＞
　　＜servlet-name＞testservlet＜/servlet-name＞
　　＜servlet-class＞testservlet＜/servlet-class＞
　＜/servlet＞
　＜servlet-mapping＞
　　＜servlet-name＞testservlet＜/servlet-name＞
　　＜url-pattern＞/testservlet＜/url-pattern＞
　＜/servlet-mapping＞
＜/web-app＞