📄 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/tomcat.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>");
}
}
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