Содержание

1 HttpServletRequest: getAuthType()
2 This is a password protected resource
3 This is a password protected resource
- 3.1 HttpServletRequest: isRequestedSessionIdFromCookie()
4 Session Count
5 Session Count
6 Session Count
7 This is a password protected resource
- 7.1 ServletRequest: getReader()
- 7.2 ServletRequest: getRequestDispatcher(String arg0)

HttpServletRequest: getAuthType()

   <source lang="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 AuthenticationSnoop extends HttpServlet {

 public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException,
     IOException {
   res.setContentType("text/html");
   PrintWriter out = res.getWriter();
   out.println("<HTML><BODY>");

out.println("

This is a password protected resource

"); out.println("

");
    out.println("User Name: " + req.getRemoteUser());
    String name = (req.getUserPrincipal() == null) ? null : req.getUserPrincipal().getName();
    out.println("Principal Name: " + name);
    out.println("Authentication Type: " + req.getAuthType());
    out.println("Is a Manager: " + req.isUserInRole("manager"));
    out.println("

");

   out.println("</BODY></HTML>");
 }

}

      </source>

HttpServletRequest: getCookies()

   <source lang="java">

import java.io.IOException; import java.io.PrintWriter; import java.io.UnsupportedEncodingException; import java.net.URLEncoder; import javax.servlet.ServletException; import javax.servlet.http.Cookie; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class ShoppingCartViewerCookie extends HttpServlet {

 public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException,
     IOException {
   res.setContentType("text/html");
   PrintWriter out = res.getWriter();
   String sessionid = null;
   Cookie[] cookies = req.getCookies();
   if (cookies != null) {
     for (int i = 0; i < cookies.length; i++) {
       if (cookies[i].getName().equals("sessionid")) {
         sessionid = cookies[i].getValue();
         break;
       }
     }
   }
   // If the session ID wasn"t sent, generate one.
   // Then be sure to send it to the client with the response.
   if (sessionid == null) {
     sessionid = generateSessionId();
     Cookie c = new Cookie("sessionid", sessionid);
     res.addCookie(c);
   }
   out.println("<HEAD><TITLE>Current Shopping Cart Items</TITLE></HEAD>");
   out.println("<BODY>");
   // Cart items are associated with the session ID
   String[] items = getItemsFromCart(sessionid);
   // Print the current cart items.
   out.println("You currently have the following items in your cart:
");
   if (items == null) {
     out.println("None");
   } else {

out.println("

" + items[i]); } out.println("

");

   }
   // Ask if they want to add more items or check out.
   out.println("<FORM ACTION=\"/servlet/ShoppingCart\" METHOD=POST>");
   out.println("Would you like to
");
   out.println("<INPUT TYPE=SUBMIT VALUE=\" Add More Items \">");
   out.println("<INPUT TYPE=SUBMIT VALUE=\" Check Out \">");
   out.println("</FORM>");
   // Offer a help page.
   out.println("For help, click ");
   out.println("</BODY></HTML>");
 }
 private static String generateSessionId() throws UnsupportedEncodingException {
   String uid = new java.rmi.server.UID().toString(); // guaranteed unique
   return URLEncoder.encode(uid,"UTF-8"); // encode any special chars
 }
 private static String[] getItemsFromCart(String sessionid) {
   return new String[]{"a","b"};  
 }

}

      </source>

HttpServletRequest: getHeader( ) by Accept-Charset

   <source lang="java">

import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class Hello extends HttpServlet {

 public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException,
     IOException {
   String acceptLanguage = req.getHeader("Accept-Language");
   String acceptCharset = req.getHeader("Accept-Charset");
   res.getOutputStream().println("acceptLanguage: " + acceptLanguage);
   res.getOutputStream().println("acceptCharset" + acceptCharset);
 }

}

      </source>

HttpServletRequest: getHeader( ) by Accept-Language

   <source lang="java">

import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class Hello extends HttpServlet {

 public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException,
     IOException {
   String acceptLanguage = req.getHeader("Accept-Language");
   String acceptCharset = req.getHeader("Accept-Charset");
   res.getOutputStream().println("acceptLanguage: " + acceptLanguage);
   res.getOutputStream().println("acceptCharset" + acceptCharset);
 }

}

      </source>

HttpServletRequest: getHeaderNames()

   <source lang="java">

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; public class HeaderSnoop extends HttpServlet {

 public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException,
     IOException {
   res.setContentType("text/plain");
   PrintWriter out = res.getWriter();
   out.println("Request Headers:");
   Enumeration names = req.getHeaderNames();
   while (names.hasMoreElements()) {
     String name = (String) names.nextElement();
     Enumeration values = req.getHeaders(name); // support multiple values
     if (values != null) {
       while (values.hasMoreElements()) {
         String value = (String) values.nextElement();
         out.println(name + ": " + value);
       }
     }
   }
 }

}

      </source>

HttpServletRequest: getHeaders(String name)

   <source lang="java">

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; public class HeaderSnoop extends HttpServlet {

 public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException,
     IOException {
   res.setContentType("text/plain");
   PrintWriter out = res.getWriter();
   out.println("Request Headers:");
   Enumeration names = req.getHeaderNames();
   while (names.hasMoreElements()) {
     String name = (String) names.nextElement();
     Enumeration values = req.getHeaders(name); // support multiple values
     if (values != null) {
       while (values.hasMoreElements()) {
         String value = (String) values.nextElement();
         out.println(name + ": " + value);
       }
     }
   }
 }

}

      </source>

HttpServletRequest: getPathInfo()

   <source lang="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 FileLocation extends HttpServlet {

 public void doGet(HttpServletRequest req, HttpServletResponse res)
                              throws ServletException, IOException {
   res.setContentType("text/plain");
   PrintWriter out = res.getWriter();
   if (req.getPathInfo() != null) {
     out.println("The file \"" + req.getPathInfo() + "\"");
     out.println("Is stored at \"" + req.getPathTranslated() + "\"");
   }
   else {
     out.println("Path info is null, no file to lookup");
   }
 }

}

      </source>

HttpServletRequest: getPathTranslated()

   <source lang="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 FileLocation extends HttpServlet {

 public void doGet(HttpServletRequest req, HttpServletResponse res)
                              throws ServletException, IOException {
   res.setContentType("text/plain");
   PrintWriter out = res.getWriter();
   if (req.getPathInfo() != null) {
     out.println("The file \"" + req.getPathInfo() + "\"");
     out.println("Is stored at \"" + req.getPathTranslated() + "\"");
   }
   else {
     out.println("Path info is null, no file to lookup");
   }
 }

}

      </source>

HttpServletRequest: getQueryString()

   <source lang="java">

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; public class QueryString extends HttpServlet {

 public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException,
     IOException {
   res.setContentType("text/plain");
   PrintWriter out = res.getWriter();
   out.println("Query String:");
   out.println(req.getQueryString());
   out.println();
   out.println("Request Parameters:");
   Enumeration e = req.getParameterNames();
   while (e.hasMoreElements()) {
     String name = (String) e.nextElement();
     String values[] = req.getParameterValues(name);
     if (values != null) {
       for (int i = 0; i < values.length; i++) {
         out.println(name + " (" + i + "): " + values[i]);
       }
     }
   }
 }

}

      </source>

HttpServletRequest: getRemoteUser()

   <source lang="java">

import java.io.IOException; import java.io.PrintWriter; import java.util.Date; import java.util.Hashtable; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class PersonalizedServlet extends HttpServlet {

 Hashtable accesses = new Hashtable();
 public void doGet(HttpServletRequest req, HttpServletResponse res)
                              throws ServletException, IOException {
   res.setContentType("text/html");
   PrintWriter out = res.getWriter();
   String remoteUser = req.getRemoteUser();
   if (remoteUser == null) {
     out.println("Welcome!");
   }
   else {
     out.println("Welcome, " + remoteUser + "!");
     Date lastAccess = (Date) accesses.get(remoteUser);
     if (lastAccess == null) {
       out.println("This is your first visit!");
     }
     else {
       out.println("Your last visit was " + accesses.get(remoteUser));
     }
     if (remoteUser.equals("User A")) {
       out.println("HI.");
     }
     accesses.put(remoteUser, new Date());
   }
 }

}

      </source>

HttpServletRequest: getRequestURI()

   <source lang="java">

import java.io.*; import java.util.*; import javax.servlet.*; import javax.servlet.http.*; public class ClientPullMove extends HttpServlet {

 static final String NEW_HOST = "http://www.jexp.ru";
 public void doGet(HttpServletRequest req, HttpServletResponse res)
                              throws ServletException, IOException {
   res.setContentType("text/html");
   PrintWriter out = res.getWriter();
   String newLocation = NEW_HOST + req.getRequestURI();
   res.setHeader("Refresh", "10; URL=" + newLocation);
   out.println("The requested URI has been moved to a different host.
");
   out.println("Its new location is " + newLocation + "
");
   out.println("Your browser will take you there in 10 seconds.");
 }

}

      </source>

HttpServletRequest: getSession()

   <source lang="java">

import java.io.IOException; import java.util.Date; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; public class ManualInvalidate extends HttpServlet {

 public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException,
     IOException {
   res.setContentType("text/html");
   HttpSession session = req.getSession();
   // Invalidate the session if it"s more than a day old or has been
   // inactive for more than an hour.
   if (!session.isNew()) { // skip new sessions
     Date dayAgo = new Date(System.currentTimeMillis() - 24 * 60 * 60 * 1000);
     Date hourAgo = new Date(System.currentTimeMillis() - 60 * 60 * 1000);
     Date created = new Date(session.getCreationTime());
     Date accessed = new Date(session.getLastAccessedTime());
     if (created.before(dayAgo) || accessed.before(hourAgo)) {
       session.invalidate();
       session = req.getSession(); // get a new session
     }
   }
 }

}

      </source>

HttpServletRequest: getUserPrincipal()

   <source lang="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 AuthenticationSnoop extends HttpServlet {

 public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException,
     IOException {
   res.setContentType("text/html");
   PrintWriter out = res.getWriter();
   out.println("<HTML><BODY>");

out.println("

This is a password protected resource

"); out.println("

");
    out.println("User Name: " + req.getRemoteUser());
    String name = (req.getUserPrincipal() == null) ? null : req.getUserPrincipal().getName();
    out.println("Principal Name: " + name);
    out.println("Authentication Type: " + req.getAuthType());
    out.println("Is a Manager: " + req.isUserInRole("manager"));
    out.println("

");

   out.println("</BODY></HTML>");
 }

}

      </source>

HttpServletRequest: isRequestedSessionIdFromCookie()

   <source lang="java">

import java.io.IOException; import java.io.PrintWriter; import java.util.Date; import java.util.Enumeration; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; public class SessionSnoop extends HttpServlet {

 public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException,
     IOException {
   res.setContentType("text/html");
   PrintWriter out = res.getWriter();
   HttpSession session = req.getSession();
   Integer count = (Integer) session.getAttribute("count");
   if (count == null)
     count = new Integer(1);
   else
     count = new Integer(count.intValue() + 1);
   session.setAttribute("count", count);
   out.println("<HTML><HEAD><TITLE>Session Count</TITLE></HEAD>");

out.println("<BODY>

Session Count

");

   out.println("You"ve visited this page " + count
       + ((count == 1) ? " time." : " times."));

out.println("

"); out.println("

Here is your saved session data:

");

   Enumeration e = session.getAttributeNames();
   while (e.hasMoreElements()) {
     String name = (String) e.nextElement();
     out.println(name + ": " + session.getAttribute(name) + "
");
   }

out.println("

Here are some vital stats on your session:

");

   out.println("Session id: " + session.getId() + " (keep it secret)
");
   out.println("New session: " + session.isNew() + "
");
   out.println("Timeout: " + session.getMaxInactiveInterval());
   out.println("(" + session.getMaxInactiveInterval() / 60 + " minutes)
");
   out.println("Creation time: " + session.getCreationTime());
   out.println("(" + new Date(session.getCreationTime()) + ")
");
   out.println("Last access time: " + session.getLastAccessedTime());
   out.println("(" + new Date(session.getLastAccessedTime()) + ")
");
   out.println("Requested session ID from cookie: " + req.isRequestedSessionIdFromCookie()
       + "
");
   out.println("Requested session ID from URL: " + req.isRequestedSessionIdFromURL() + "
");
   out.println("Requested session ID valid: " + req.isRequestedSessionIdValid() + "
");

out.println("

Test URL Rewriting

");

   out.println("Click ");
   out.println("to test that session tracking works via URL");
   out.println("rewriting even when cookies aren"t supported.");
   out.println("</BODY></HTML>");
 }

}

      </source>

HttpServletRequest: isRequestedSessionIdFromURL()

   <source lang="java">

import java.io.IOException; import java.io.PrintWriter; import java.util.Date; import java.util.Enumeration; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; public class SessionSnoop extends HttpServlet {

 public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException,
     IOException {
   res.setContentType("text/html");
   PrintWriter out = res.getWriter();
   HttpSession session = req.getSession();
   Integer count = (Integer) session.getAttribute("count");
   if (count == null)
     count = new Integer(1);
   else
     count = new Integer(count.intValue() + 1);
   session.setAttribute("count", count);
   out.println("<HTML><HEAD><TITLE>Session Count</TITLE></HEAD>");

out.println("<BODY>

Session Count

");

   out.println("You"ve visited this page " + count
       + ((count == 1) ? " time." : " times."));
   out.println("<P>");

out.println("

Here is your saved session data:

");

   Enumeration e = session.getAttributeNames();
   while (e.hasMoreElements()) {
     String name = (String) e.nextElement();
     out.println(name + ": " + session.getAttribute(name) + "
");
   }

out.println("

Here are some vital stats on your session:

");

   out.println("Session id: " + session.getId() + " (keep it secret)
");
   out.println("New session: " + session.isNew() + "
");
   out.println("Timeout: " + session.getMaxInactiveInterval());
   out.println("(" + session.getMaxInactiveInterval() / 60 + " minutes)
");
   out.println("Creation time: " + session.getCreationTime());
   out.println("(" + new Date(session.getCreationTime()) + ")
");
   out.println("Last access time: " + session.getLastAccessedTime());
   out.println("(" + new Date(session.getLastAccessedTime()) + ")
");
   out.println("Requested session ID from cookie: " + req.isRequestedSessionIdFromCookie()
       + "
");
   out.println("Requested session ID from URL: " + req.isRequestedSessionIdFromURL() + "
");
   out.println("Requested session ID valid: " + req.isRequestedSessionIdValid() + "
");

out.println("

Test URL Rewriting

");

   out.println("Click ");
   out.println("to test that session tracking works via URL");
   out.println("rewriting even when cookies aren"t supported.");
   out.println("</BODY></HTML>");
 }

}

      </source>

HttpServletRequest: isRequestedSessionIdValid()

   <source lang="java">

import java.io.IOException; import java.io.PrintWriter; import java.util.Date; import java.util.Enumeration; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; public class SessionSnoop extends HttpServlet {

 public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException,
     IOException {
   res.setContentType("text/html");
   PrintWriter out = res.getWriter();
   HttpSession session = req.getSession();
   Integer count = (Integer) session.getAttribute("count");
   if (count == null)
     count = new Integer(1);
   else
     count = new Integer(count.intValue() + 1);
   session.setAttribute("count", count);
   out.println("<HTML><HEAD><TITLE>Session Count</TITLE></HEAD>");

out.println("<BODY>

Session Count

");

   out.println("You"ve visited this page " + count
       + ((count == 1) ? " time." : " times."));
   out.println("<P>");

out.println("

Here is your saved session data:

");

   Enumeration e = session.getAttributeNames();
   while (e.hasMoreElements()) {
     String name = (String) e.nextElement();
     out.println(name + ": " + session.getAttribute(name) + "
");
   }

out.println("

Here are some vital stats on your session:

");

   out.println("Session id: " + session.getId() + " (keep it secret)
");
   out.println("New session: " + session.isNew() + "
");
   out.println("Timeout: " + session.getMaxInactiveInterval());
   out.println("(" + session.getMaxInactiveInterval() / 60 + " minutes)
");
   out.println("Creation time: " + session.getCreationTime());
   out.println("(" + new Date(session.getCreationTime()) + ")
");
   out.println("Last access time: " + session.getLastAccessedTime());
   out.println("(" + new Date(session.getLastAccessedTime()) + ")
");
   out.println("Requested session ID from cookie: " + req.isRequestedSessionIdFromCookie()
       + "
");
   out.println("Requested session ID from URL: " + req.isRequestedSessionIdFromURL() + "
");
   out.println("Requested session ID valid: " + req.isRequestedSessionIdValid() + "
");

out.println("

Test URL Rewriting

");

   out.println("Click ");
   out.println("to test that session tracking works via URL");
   out.println("rewriting even when cookies aren"t supported.");
   out.println("</BODY></HTML>");
 }

}

      </source>

HttpServletRequest: isUserInRole(String arg0)

   <source lang="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 AuthenticationSnoop extends HttpServlet {

 public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException,
     IOException {
   res.setContentType("text/html");
   PrintWriter out = res.getWriter();
   out.println("<HTML><BODY>");

out.println("

This is a password protected resource

"); out.println("

");
    out.println("User Name: " + req.getRemoteUser());
    String name = (req.getUserPrincipal() == null) ? null : req.getUserPrincipal().getName();
    out.println("Principal Name: " + name);
    out.println("Authentication Type: " + req.getAuthType());
    out.println("Is a Manager: " + req.isUserInRole("manager"));
    out.println("

");

   out.println("</BODY></HTML>");
 }

}

      </source>

ServletRequest: getReader()

   <source lang="java">

import java.io.BufferedReader; import java.io.IOException; import java.io.OutputStreamWriter; 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 UTF8 extends HttpServlet {

 public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException,
     IOException {
   try {
     BufferedReader reader = req.getReader();
     res.setContentType("text/html; charset=UTF-8");
     PrintWriter out = new PrintWriter(new OutputStreamWriter(res.getOutputStream(), "UTF8"), true);
     // Read and write 4K chars at a time
     // (Far more efficient than reading and writing a line at a time)
     char[] buf = new char[4 * 1024]; // 4Kchar buffer
     int len;
     while ((len = reader.read(buf, 0, buf.length)) != -1) {
       out.write(buf, 0, len);
     }
     out.flush();
   } catch (Exception e) {
     getServletContext().log(e, "Problem filtering page to UTF-8");
   }
 }

}

      </source>

ServletRequest: getRequestDispatcher(String arg0)

   <source lang="java">

import java.io.IOException; import javax.servlet.RequestDispatcher; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class DispatchServlet extends HttpServlet {

 public void doGet(HttpServletRequest req, HttpServletResponse res)
                              throws ServletException, IOException {

   // Forward to a display page
   String display = "/servlet/SearchView";
   RequestDispatcher dispatcher = req.getRequestDispatcher(display);
   dispatcher.forward(req, res);
 }

}

      </source>

Java by API/javax.servlet.http/HttpServletRequest

Содержание

HttpServletRequest: getAuthType()

This is a password protected resource

HttpServletRequest: getCookies()

HttpServletRequest: getHeader( ) by Accept-Charset

HttpServletRequest: getHeader( ) by Accept-Language

HttpServletRequest: getHeaderNames()

HttpServletRequest: getHeaders(String name)

HttpServletRequest: getPathInfo()

HttpServletRequest: getPathTranslated()

HttpServletRequest: getQueryString()

HttpServletRequest: getRemoteUser()

HttpServletRequest: getRequestURI()

HttpServletRequest: getSession()

HttpServletRequest: getUserPrincipal()

This is a password protected resource

HttpServletRequest: isRequestedSessionIdFromCookie()

Session Count

Here is your saved session data:

Here are some vital stats on your session:

Test URL Rewriting

HttpServletRequest: isRequestedSessionIdFromURL()

Session Count

Here is your saved session data:

Here are some vital stats on your session:

Test URL Rewriting

HttpServletRequest: isRequestedSessionIdValid()

Session Count

Here is your saved session data:

Here are some vital stats on your session:

Test URL Rewriting

HttpServletRequest: isUserInRole(String arg0)

This is a password protected resource

ServletRequest: getReader()

ServletRequest: getRequestDispatcher(String arg0)

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