Admin: 1 версия

2010-05-31T14:35:39Z

1 версия

Новая страница

== 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("<H1>This is a password protected resource</H1>");
out.println("<PRE>");
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("</PRE>");
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:<BR>");
if (items == null) {
out.println("<B>None</B>");
} else {
out.println("<UL>");
for (int i = 0; i < items.length; i++) {
out.println("<LI>" + items[i]);
}
out.println("</UL>");
}
// 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<BR>");
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.<BR>");
out.println("Its new location is " + newLocation + "<BR>");
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("<H1>This is a password protected resource</H1>");
out.println("<PRE>");
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("</PRE>");
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><H1>Session Count</H1>");
out.println("You"ve visited this page " + count
+ ((count == 1) ? " time." : " times."));
out.println("<P>");
out.println("<H3>Here is your saved session data:</H3>");
Enumeration e = session.getAttributeNames();
while (e.hasMoreElements()) {
String name = (String) e.nextElement();
out.println(name + ": " + session.getAttribute(name) + "<BR>");
}
out.println("<H3>Here are some vital stats on your session:</H3>");
out.println("Session id: " + session.getId() + " <I>(keep it secret)</I><BR>");
out.println("New session: " + session.isNew() + "<BR>");
out.println("Timeout: " + session.getMaxInactiveInterval());
out.println("<I>(" + session.getMaxInactiveInterval() / 60 + " minutes)</I><BR>");
out.println("Creation time: " + session.getCreationTime());
out.println("<I>(" + new Date(session.getCreationTime()) + ")</I><BR>");
out.println("Last access time: " + session.getLastAccessedTime());
out.println("<I>(" + new Date(session.getLastAccessedTime()) + ")</I><BR>");
out.println("Requested session ID from cookie: " + req.isRequestedSessionIdFromCookie()
+ "<BR>");
out.println("Requested session ID from URL: " + req.isRequestedSessionIdFromURL() + "<BR>");
out.println("Requested session ID valid: " + req.isRequestedSessionIdValid() + "<BR>");
out.println("<H3>Test URL Rewriting</H3>");
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><H1>Session Count</H1>");
out.println("You"ve visited this page " + count
+ ((count == 1) ? " time." : " times."));
out.println("<P>");
out.println("<H3>Here is your saved session data:</H3>");
Enumeration e = session.getAttributeNames();
while (e.hasMoreElements()) {
String name = (String) e.nextElement();
out.println(name + ": " + session.getAttribute(name) + "<BR>");
}
out.println("<H3>Here are some vital stats on your session:</H3>");
out.println("Session id: " + session.getId() + " <I>(keep it secret)</I><BR>");
out.println("New session: " + session.isNew() + "<BR>");
out.println("Timeout: " + session.getMaxInactiveInterval());
out.println("<I>(" + session.getMaxInactiveInterval() / 60 + " minutes)</I><BR>");
out.println("Creation time: " + session.getCreationTime());
out.println("<I>(" + new Date(session.getCreationTime()) + ")</I><BR>");
out.println("Last access time: " + session.getLastAccessedTime());
out.println("<I>(" + new Date(session.getLastAccessedTime()) + ")</I><BR>");
out.println("Requested session ID from cookie: " + req.isRequestedSessionIdFromCookie()
+ "<BR>");
out.println("Requested session ID from URL: " + req.isRequestedSessionIdFromURL() + "<BR>");
out.println("Requested session ID valid: " + req.isRequestedSessionIdValid() + "<BR>");
out.println("<H3>Test URL Rewriting</H3>");
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><H1>Session Count</H1>");
out.println("You"ve visited this page " + count
+ ((count == 1) ? " time." : " times."));
out.println("<P>");
out.println("<H3>Here is your saved session data:</H3>");
Enumeration e = session.getAttributeNames();
while (e.hasMoreElements()) {
String name = (String) e.nextElement();
out.println(name + ": " + session.getAttribute(name) + "<BR>");
}
out.println("<H3>Here are some vital stats on your session:</H3>");
out.println("Session id: " + session.getId() + " <I>(keep it secret)</I><BR>");
out.println("New session: " + session.isNew() + "<BR>");
out.println("Timeout: " + session.getMaxInactiveInterval());
out.println("<I>(" + session.getMaxInactiveInterval() / 60 + " minutes)</I><BR>");
out.println("Creation time: " + session.getCreationTime());
out.println("<I>(" + new Date(session.getCreationTime()) + ")</I><BR>");
out.println("Last access time: " + session.getLastAccessedTime());
out.println("<I>(" + new Date(session.getLastAccessedTime()) + ")</I><BR>");
out.println("Requested session ID from cookie: " + req.isRequestedSessionIdFromCookie()
+ "<BR>");
out.println("Requested session ID from URL: " + req.isRequestedSessionIdFromURL() + "<BR>");
out.println("Requested session ID valid: " + req.isRequestedSessionIdValid() + "<BR>");
out.println("<H3>Test URL Rewriting</H3>");
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("<H1>This is a password protected resource</H1>");
out.println("<PRE>");
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("</PRE>");
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 - История изменений

в 17:43, 31 мая 2010

Admin: 1 версия

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