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| 25. 2. 3. 返回任何参数，并列出服务器属性。 |
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import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class Properties extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException,
IOException {
PrintWriter out = resp.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<title>My First Servlet</title>");
out.println("</head>");
out.println("<h2><center>");
out.println("Information About You</center></h2>");
out.println("<br>");
out.println("<center><table border>");
out.println("<tr>");
out.println("<td>Method</td>");
out.println("<td>" + req.getMethod() + "</td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td>User</td>");
out.println("<td>" + req.getRemoteUser() + "</td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td>Client</td>");
out.println("<td>" + req.getRemoteHost() + "</td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td>Protocol</td>");
out.println("<td>" + req.getProtocol() + "</td>");
out.println("</tr>");
java.util.Enumeration e = req.getParameterNames();
while (e.hasMoreElements()) {
String name = (String) e.nextElement();
out.println("<tr>");
out.println("<td>Parameter '" + name + "'</td>");
out.println("<td>" + req.getParameter(name) + "</td>");
out.println("</tr>");
}
out.println("</table></center><br><hr><br>");
out.println("<h2><center>");
out.println("Server Properties</center></h2>");
out.println("<br>");
out.println("<center><table border width=80%>");
java.util.Properties props = System.getProperties();
e = props.propertyNames();
while (e.hasMoreElements()) {
String name = (String) e.nextElement();
out.println("<tr>");
out.println("<td>" + name + "</td>");
out.println("<td>" + props.getProperty(name) + "</td>");
out.println("</tr>");
}
out.println("</table></center>");
out.println("</html>");
out.flush();
}
public void init() throws ServletException {
ServletConfig config = getServletConfig();
}
public void destroy() {
}
}
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