import java.io.IOException;import java.io.PrintWriter;import javax.servlet.Servlet;import javax.servlet.ServletConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;//实现Servlet接口来开发Servlet程序public class Demo3 implements Servlet { @Override public void destroy() { // TODO Auto-generated method stub } @Override public ServletConfig getServletConfig() { // TODO Auto-generated method stub return null; } @Override public String getServletInfo() { // TODO Auto-generated method stub return null; } @Override public void init(ServletConfig arg0) throws ServletException { // TODO Auto-generated method stub } @Override public void service(ServletRequest request, ServletResponse response) throws ServletException, IOException { //取得服务端向浏览器的输出流对象 PrintWriter pw = response.getWriter(); pw.write("welcome to java web coure!"); }}

web.xml

<servlet> <servlet-name>Demo3</servlet-name> <servlet-class>cn.web.http.Demo3</servlet-class> </servlet> <servlet-mapping> <servlet-name>Demo3</servlet-name> <url-pattern>/Demo3</url-pattern> </servlet-mapping>