📄 hello.java
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/* * Copyright 1999,2004 The Apache Software Foundation. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package mypackage;import java.io.IOException;import java.io.PrintWriter;import java.util.Enumeration;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * Simple servlet to validate that the Hello, World example can * execute servlets. In the web application deployment descriptor, * this servlet must be mapped to correspond to the link in the * "index.html" file. * * @author Craig R. McClanahan <Craig.McClanahan@eng.sun.com> */public final class Hello extends HttpServlet { /** * Respond to a GET request for the content produced by * this servlet. * * @param request The servlet request we are processing * @param response The servlet response we are producing * * @exception IOException if an input/output error occurs * @exception ServletException if a servlet error occurs */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { response.setContentType("text/html"); PrintWriter writer = response.getWriter(); writer.println("<html>"); writer.println("<head>"); writer.println("<title>Sample Application Servlet Page</title>"); writer.println("</head>"); writer.println("<body bgcolor=white>"); writer.println("<table border=\"0\">"); writer.println("<tr>"); writer.println("<td>"); writer.println("<img src=\"images/logo.gif\">"); writer.println("</td>"); writer.println("<td>"); writer.println("<h1>Sample Application Servlet</h1>"); writer.println("This is the output of a servlet that is part of"); writer.println("the Hello, World application. It displays the"); writer.println("request headers from the request we are currently"); writer.println("processing."); writer.println("</td>"); writer.println("</tr>"); writer.println("</table>"); writer.println("<table border=\"0\" width=\"100%\">"); Enumeration names = request.getHeaderNames(); while (names.hasMoreElements()) { String name = (String) names.nextElement(); writer.println("<tr>"); writer.println(" <th align=\"right\">" + name + ":</th>"); writer.println(" <td>" + request.getHeader(name) + "</td>"); writer.println("</tr>"); } writer.println("</table>"); writer.println("</body>"); writer.println("</html>"); }}⌨️ 快捷键说明
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