该Servlet实现如下功能：当用户通过浏览器访问该Servlet时，该Servlet向客户端浏览器返回一个HTML页面。在Edit-Plus里输入以下内容，并编译，得到ShowHtml.class.
ShowHtml.java
import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class HelloWorld extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println("<html>"); out.println("<head>"); out.println("<title>Hello World</title>"); out.println("</head>"); out.println("<body>"); out.println("<h1>Hello World!</h1>"); out.println("</body>"); out.println("</html>"); } } 在web.xml文件中添加： <?xml version="1.0" encoding="UTF-8"?> <!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> <servlet> <servlet-name>HtmlServlet</servlet-name> <servlet-class>com.JavaBean.ShowHtml</servlet-class> </servlet> <servlet-mapping> <servlet-name>HtmlServlet</servlet-name> <url-pattern>/htmlservlet</url-pattern> </servlet-mapping> </web-app>打开浏览器，输入：
http://localhost:8080/htmlservlet
