Java/Servlets/Cookie
Содержание
- 1 A utility class for parsing HTTP dates as used in cookies and other headers
- 2 Cookie Demo
- 3 Information about the cookie named \"mycookie\"
- 4 Cookie reader
- 5 The name and value of each found cookie
- 6 This request did not include any cookies
- 7 Cookie Utilities
- 8 Parse a Cookie: header into individual tokens according to RFC 2109.
- 9 Parsing and formatting HTTP dates as used in cookies and other headers.
- 10 Setting and Reading Cookies
- 11 Setting and Reading Cookies
A utility class for parsing HTTP dates as used in cookies and other headers
<source lang="java">
/*
* $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//httpclient/src/java/org/apache/commons/httpclient/util/DateParser.java,v 1.11 2004/11/06 19:15:42 mbecke Exp $ * $Revision: 480424 $ * $Date: 2006-11-29 06:56:49 +0100 (Wed, 29 Nov 2006) $ * * * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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. * * * This software consists of voluntary contributions made by many * individuals on behalf of the Apache Software Foundation. For more * information on the Apache Software Foundation, please see * <http://www.apache.org/>. * */
import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Arrays; import java.util.Collection; import java.util.Date; import java.util.Iterator; import java.util.Locale; import java.util.TimeZone; /**
* A utility class for parsing HTTP dates as used in cookies and other headers. * This class handles dates as defined by RFC 2616 section 3.3.1 as well as * some other common non-standard formats. * * @author Christopher Brown * @author Michael Becke * */
public class DateParser {
/**
* Date format pattern used to parse HTTP date headers in RFC 1123 format.
*/
public static final String PATTERN_RFC1123 = "EEE, dd MMM yyyy HH:mm:ss zzz";
/**
* Date format pattern used to parse HTTP date headers in RFC 1036 format.
*/
public static final String PATTERN_RFC1036 = "EEEE, dd-MMM-yy HH:mm:ss zzz";
/**
* Date format pattern used to parse HTTP date headers in ANSI C
* asctime() format.
*/
public static final String PATTERN_ASCTIME = "EEE MMM d HH:mm:ss yyyy";
private static final Collection DEFAULT_PATTERNS = Arrays.asList(
new String[] { PATTERN_ASCTIME, PATTERN_RFC1036, PATTERN_RFC1123 } );
/**
* Parses a date value. The formats used for parsing the date value are retrieved from
* the default http params.
*
* @param dateValue the date value to parse
*
* @return the parsed date
*
* @throws DateParseException if the value could not be parsed using any of the
* supported date formats
*/
public static Date parseDate(String dateValue){
return parseDate(dateValue, null);
}
/**
* Parses the date value using the given date formats.
*
* @param dateValue the date value to parse
* @param dateFormats the date formats to use
*
* @return the parsed date
*
* @throws DateParseException if none of the dataFormats could parse the dateValue
*/
public static Date parseDate(
String dateValue,
Collection dateFormats
) {
if (dateValue == null) {
throw new IllegalArgumentException("dateValue is null");
}
if (dateFormats == null) {
dateFormats = DEFAULT_PATTERNS;
}
// trim single quotes around date if present
// see issue #5279
if (dateValue.length() > 1
&& dateValue.startsWith(""")
&& dateValue.endsWith(""")
) {
dateValue = dateValue.substring (1, dateValue.length() - 1);
}
SimpleDateFormat dateParser = null;
Iterator formatIter = dateFormats.iterator();
while (formatIter.hasNext()) {
String format = (String) formatIter.next();
if (dateParser == null) {
dateParser = new SimpleDateFormat(format, Locale.US);
dateParser.setTimeZone(TimeZone.getTimeZone("GMT"));
} else {
dateParser.applyPattern(format);
}
try {
return dateParser.parse(dateValue);
} catch (ParseException pe) {
// ignore this exception, we will try the next format
}
}
// we were unable to parse the date
throw new RuntimeException("Unable to parse the date " + dateValue);
}
/** This class should not be instantiated. */
private DateParser() { }
}
</source>
Cookie Demo
<source lang="java">
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 CookieServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
Cookie cookie = null;
Cookie[] cookies = request.getCookies();
boolean newCookie = false;
if (cookies != null) {
for (int i = 0; i < cookies.length; i++) {
if (cookies[i].getName().equals("mycookie")) {
cookie = cookies[i];
}
}
}
if (cookie == null) {
newCookie = true;
int maxAge;
try {
maxAge = new Integer(getServletContext().getInitParameter(
"cookie-age")).intValue();
} catch (Exception e) {
maxAge = -1;
}
cookie = new Cookie("mycookie", "" + getNextCookieValue());
cookie.setPath(request.getContextPath());
cookie.setMaxAge(maxAge);
response.addCookie(cookie);
}
response.setContentType("text/html");
java.io.PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<title>Cookie info</title>");
out.println("</head>");
out.println("<body>");
out
.println("Information about the cookie named \"mycookie\"
"); out.println("Cookie value: " + cookie.getValue() + "
");
if (newCookie) {
out.println("Cookie Max-Age: " + cookie.getMaxAge() + "
");
out.println("Cookie Path: " + cookie.getPath() + "
");
}
out.println("</body>");
out.println("</html>");
out.close();
}
private long getNextCookieValue() {
return new java.util.Date().getTime();
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
doGet(request, response);
}
}
</source>
Cookie reader
<source lang="java">
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 CookieReader extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
Cookie cookie = null;
//Get an array of Cookies associated with this domain
Cookie[] cookies = request.getCookies();
boolean hasCookies = false;
if (cookies != null)
hasCookies = true;
// display the name/value of each cookie
response.setContentType("text/html");
java.io.PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<title>Cookie information</title>");
out.println("</head>");
out.println("<body>");
if (hasCookies) {
out.println("The name and value of each found cookie
"); for (int i = 0; i < cookies.length; i++) {
cookie = cookies[i];
out.println("Name of cookie #" + (i + 1) + ": "
+ cookie.getName() + "
");
out.println("Value of cookie #" + (i + 1) + ": "
+ cookie.getValue() + "
");
}
} else {
out.println("This request did not include any cookies
"); }
out.println("</body>");
out.println("</html>");
out.close();
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
doGet(request, response);
}
}
</source>
Cookie Utilities
<source lang="java">
/**********************************************************************************
* * Copyright (c) 2003, 2004 The Regents of the University of Michigan, Trustees of Indiana University, * Board of Trustees of the Leland Stanford, Jr., University, and The MIT Corporation * * Licensed under the Educational Community License Version 1.0 (the "License"); * By obtaining, using and/or copying this Original Work, you agree that you have read, * understand, and will comply with the terms and conditions of the Educational Community License. * You may obtain a copy of the License at: * * http://cvs.sakaiproject.org/licenses/license_1_0.html * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE * AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. * **********************************************************************************/
import java.net.MalformedURLException; import java.net.URL; import java.util.ArrayList; import java.util.Iterator; import java.util.List; public class CookieUtils {
private CookieUtils() {
}
/**
* Get a new (empty) CookieData list return An empty ArrayList
*/
public static List newCookieList() {
return new ArrayList();
}
/**
* Parse an HTTP cookie
*
* @param value
* Cookie value
* @return A CookieData object representing this cookie
*/
public static CookieData parseCookie(URL url, String value) {
String[] cookieFields;
CookieData cookie;
cookieFields = value.split(";\\s*");
cookie = makeCookieData(url, cookieFields[0]);
for (int j = 1; j < cookieFields.length; j++) {
if ("secure".equalsIgnoreCase(cookieFields[j])) {
cookie.setSecure(true);
continue;
}
if (cookieFields[j].indexOf("=") > 0) {
String[] field = cookieFields[j].split("=");
if ("expires".equalsIgnoreCase(field[0])) {
cookie.setExpires(field[1]);
} else if ("domain".equalsIgnoreCase(field[0])) {
cookie.setDomain(field[1]);
} else if ("path".equalsIgnoreCase(field[0])) {
cookie.setPath(field[1]);
} else if ("version".equalsIgnoreCase(field[0])) {
cookie.setVersion(field[1]);
} else if ("max-age".equalsIgnoreCase(field[0])) {
cookie.setMaxAge(field[1]);
}
}
}
return cookie;
}
/**
* Build a CookieData object from cookieName=cookieValue text
*
* @param url
* URL this cookie belongs to
* @param cookieText
* cookieName[=cookieValue] text
* @return A new CookieData object
*/
private static CookieData makeCookieData(URL url, String cookieText) {
for (int i = 0; i < cookieText.length(); i++) {
if (cookieText.charAt(i) == "=") {
String name = cookieText.substring(0, i);
String value = "";
if (i + 1 <= cookieText.length()) {
value = cookieText.substring(i + 1);
}
return new CookieData(url, name, value);
}
}
return new CookieData(url, cookieText, "");
}
/**
* Maintain a list of CookieData objects (add, replace, or delete a cookie)
*
* @param cookieList
* CookieData list
* @param cookie
* A CookieData object
*/
public static void storeCookie(List cookieList, CookieData cookie) {
int size = cookieList.size();
for (int i = 0; i < size; i++) {
CookieData cd = (CookieData) cookieList.get(i);
if (cookie.equals(cd)) {
if (cookie.getMaxAge() == 0) {
cookieList.remove(i);
return;
}
cookieList.set(i, cookie);
return;
}
}
if (cookie.getMaxAge() != 0) {
cookieList.add(cookie);
}
}
/**
* Does the cookie domain match the URL?
*
* @param urlString
* URL String to match
* @param cookie
* CookieData object (the cookie)
* @return true if the cookie domain matches the URL
*/
public static boolean inDomain(String urlString, CookieData cookie) {
URL url;
try {
url = new URL(urlString);
} catch (MalformedURLException exception) {
return false;
}
return inDomain(url, cookie);
}
/**
* Does the cookie domain match the URL?
*
* @param url
* URL to match
* @param cookie
* CookieData object (the cookie)
* @return true if the cookie domain matches the URL
*/
public static boolean inDomain(URL url, CookieData cookie) {
String domain = cookie.getDomain();
return url.getHost().toLowerCase().endsWith(domain.toLowerCase());
}
/**
* Does the cookie path match the URL "file"?
*
* @param urlString
* String URL to match
* @param cookie
* CookieData object (the cookie)
* @return true if the cookie domain matches the URL
*/
public static boolean inPath(String urlString, CookieData cookie) {
URL url;
try {
url = new URL(urlString);
} catch (MalformedURLException exception) {
return false;
}
return inPath(url, cookie);
}
/**
* Does the cookie path match the URL "file"?
*
* @param url
* URL to match
* @param cookie
* CookieData object (the cookie)
* @return true if the cookie domain matches the URL
*/
public static boolean inPath(URL url, CookieData cookie) {
return url.getFile().startsWith(cookie.getPath());
}
/**
* Find all stored cookies which associated with this server
*
* @param cookieList
* List of stored cookies (CookieData objects)
* @param url
* URL representing the request to lookup (server)
* @return A List of associated cookies
*/
public static List findCookiesForServer(List cookieList, URL url) {
Iterator iterator = cookieList.iterator();
ArrayList list = new ArrayList();
while (iterator.hasNext()) {
CookieData cookie = (CookieData) iterator.next();
if ((inDomain(url, cookie)) && (inPath(url, cookie))) {
list.add(cookie);
}
}
return list;
}
/**
* Find cookies associated with this server (by name)
*
* @param cookieList
* List of stored cookies (CookieData objects)
* @param url
* URL representing the request to lookup (server)
* @param name
* Cookie name
* @param exact
* true for exact name match, false to match on name prefix
* @return A List of associated cookies
*/
public static List getCookies(List cookieList, URL url, String name, boolean exact) {
List serverCookies = findCookiesForServer(cookieList, url);
Iterator iterator = serverCookies.iterator();
ArrayList list = new ArrayList();
while (iterator.hasNext()) {
CookieData cookie = (CookieData) iterator.next();
if (exact) {
if (cookie.getName().equals(name)) {
list.add(cookie);
}
continue;
}
if (cookie.getName().startsWith(name)) {
list.add(cookie);
}
}
return list;
}
/**
* Find cookies associated with this server (exact name match)
*
* @param cookieList
* List of stored cookies (CookieData objects)
* @param url
* URL representing the request to lookup (server)
* @param name
* Cookie name
* @return A List of associated cookies
*/
public static List getCookiesByName(List cookieList, URL url, String name) {
return getCookies(cookieList, url, name, true);
}
/**
* Find cookies associated with this server (match on name "prefix")
*
* @param cookieList
* List of stored cookies (CookieData objects)
* @param url
* URL representing the request to lookup (server)
* @param name
* Cookie name
* @return A List of associated cookies
*/
public static List getCookiesByPrefix(List cookieList, URL url, String name) {
return getCookies(cookieList, url, name, false);
}
} /*******************************************************************************
* * Copyright (c) 2003, 2004 The Regents of the University of Michigan, Trustees * of Indiana University, Board of Trustees of the Leland Stanford, Jr., * University, and The MIT Corporation * * Licensed under the Educational Community License Version 1.0 (the "License"); * By obtaining, using and/or copying this Original Work, you agree that you * have read, understand, and will comply with the terms and conditions of the * Educational Community License. You may obtain a copy of the License at: * * http://cvs.sakaiproject.org/licenses/license_1_0.html * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. * ******************************************************************************/
/**
* Represent a single cookie */
class CookieData {
/**
* Null (unset) cookie age
*/
public static final int NULL_AGE = -1;
/**
* Expired cookie
*/
public static final int EXPIRED_AGE = 0;
private String key;
private String value;
private String path;
private String domain;
private String version;
private String expires;
private int maxAge;
private boolean secure;
private CookieData() {
}
/**
* Constructor
*
* @param url
* URL associated with this cookie
* @param key
* Cookie name
* @param value
* Cookie value
*/
public CookieData(URL url, String key, String value) {
int slash = url.getFile().lastIndexOf("/");
/*
* Save cookie name and content
*/
this.key = key;
this.value = value;
/*
* Domain defaults to hostname, path to the "directory" portion of the
* request, minus all text from the rightmost "/" character to the end of
* the string...
*/
this.path = slash < 1 ? "" : url.getFile().substring(0, slash);
this.domain = url.getHost();
this.version = null;
this.expires = null;
this.maxAge = NULL_AGE;
this.secure = false;
}
/**
* Get cookie name
*
* @return The cooke name
*/
public String getName() {
return this.key;
}
/**
* Get cookie value (the cookie "text")
*
* @return The value
*/
public String getValue() {
return this.value;
}
/**
* Save the path
*/
public void setPath(String path) {
this.path = path;
}
/**
* Get the path
*
* @return The cooke path attribute value (null if none)
*/
public String getPath() {
return this.path;
}
/**
* Save the expiration date
*/
public void setExpires(String expires) {
this.expires = expires;
}
/**
* Get the expiration date
*
* @return The expires attribute value (null if none)
*/
public String getExpires() {
return this.expires;
}
/**
* Save the domain
*/
public void setDomain(String domain) {
this.domain = domain;
}
/**
* Get the domain
*
* @return The domain attribute value (null if none)
*/
public String getDomain() {
return this.domain;
}
/**
* Save the version
*/
public void setVersion(String version) {
this.version = version;
}
/**
* Get the cookie version
*
* @return The version (null if none)
*/
public String getVersion() {
return this.version;
}
/**
* Set the maximum age for this cookie
*/
public void setMaxAge(String maxAge) {
try {
this.maxAge = Integer.parseInt(maxAge);
} catch (NumberFormatException ignore) {
}
}
/**
* Get the maximum age for this cookie
*/
public int getMaxAge() {
return this.maxAge;
}
/**
* Save security setting (true if cookie to be sent only via HTTPS)
*/
public void setSecure(boolean secure) {
this.secure = secure;
}
public boolean getSecure() {
return this.secure;
}
/**
* Equal strings?
*
* @param a
* String one
* @param b
* Stringtwo
* @return true if both are null, or String "equals" is true
*/
private boolean stringEquals(String a, String b) {
if ((a == null) && (b == null)) {
return true;
}
if ((a == null) || (b == null)) {
return false;
}
return a.equals(b);
}
/**
* Equal cookies?
*
* @param cookie
* for comparison
* @return true if cookie name, path, and domain are all equal
*/
public boolean equals(CookieData cookie) {
if (!key.equals(cookie.getName())) {
return false;
}
return stringEquals(path, cookie.getPath()) && stringEquals(domain, cookie.getDomain());
}
}
</source>
Parse a Cookie: header into individual tokens according to RFC 2109.
<source lang="java">
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can obtain
* a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
* or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
* Sun designates this particular file as subject to the "Classpath" exception
* as provided by Sun in the GPL Version 2 section of the License file that
* accompanied this code. If applicable, add the following below the License
* Header, with the fields enclosed by brackets [] replaced by your own
* identifying information: "Portions Copyrighted [year]
* [name of copyright owner]"
*
* Contributor(s):
*
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don"t indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
/*
* Copyright 2004-2005 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */
import java.lang.System; import java.lang.String; import java.lang.IndexOutOfBoundsException; import java.lang.ArrayIndexOutOfBoundsException; /**
* Parse a Cookie: header into individual tokens according to RFC 2109. */
public class CookieTokenizer {
/**
* Upper bound on the number of cookie tokens to accept. The limit is
* based on the 4 different attributes (4.3.4) and the 20 cookie minimum
* (6.3) given in RFC 2109 multiplied by 2 to accomodate the 2 tokens in
* each name=value pair ("JSESSIONID=1234" is 2 tokens).
*/
private static final int MAX_COOKIE_TOKENS = 4 * 20 * 2;
/**
* Array of cookie tokens. Even indices contain name tokens while odd
* indices contain value tokens (or null).
*/
private String tokens[] = new String[MAX_COOKIE_TOKENS];
/**
* Number of cookie tokens currently in the tokens[] array.
*/
private int numTokens = 0;
/**
* Parse a name=value pair from the Cookie: header.
*
* @param cookies The Cookie: header to parse
* @param beginIndex The index in cookies to begin parsing from, inclusive
*/
private int parseNameValue(String cookies, int beginIndex) {
int length = cookies.length();
int index = beginIndex;
while (index < length) {
switch (cookies.charAt(index)) {
case ";":
case ",":
// Found end of name token without value
tokens[numTokens] = cookies.substring(beginIndex, index).trim();
if (tokens[numTokens].length() > 0) {
numTokens++;
tokens[numTokens] = null;
numTokens++;
}
return index + 1;
case "=":
// Found end of name token with value
tokens[numTokens] = cookies.substring(beginIndex, index).trim();
numTokens++;
return parseValue(cookies, index + 1);
case """:
// Skip past quoted span
do index++; while (cookies.charAt(index) != """);
break;
}
index++;
}
if (index > beginIndex) {
// Found end of name token without value
tokens[numTokens] = cookies.substring(beginIndex, index).trim();
if (tokens[numTokens].length() > 0) {
numTokens++;
tokens[numTokens] = null;
numTokens++;
}
}
return index;
}
/**
* Parse the name=value tokens from a Cookie: header.
*
* @param cookies The Cookie: header to parse
*/
public int tokenize(String cookies) {
numTokens = 0;
if (cookies != null) {
try {
// Advance through cookies, parsing name=value pairs
int length = cookies.length();
int index = 0;
while (index < length)
index = parseNameValue(cookies, index);
}
catch (ArrayIndexOutOfBoundsException e) {
// Filled up the tokens[] array
}
catch (IndexOutOfBoundsException e) {
// Walked off the end of the cookies header
}
}
return numTokens;
}
/**
* Return the number of cookie tokens parsed from the Cookie: header.
*/
public int getNumTokens() {
return numTokens;
}
/**
* Returns a given cookie token from the Cookie: header.
*
* @param index The index of the cookie token to return
*/
public String tokenAt(int index) {
return tokens[index];
}
/**
* Parse the value token from a name=value pair.
*
* @param cookies The Cookie: header to parse
* @param beginIndex The index in cookies to begin parsing from, inclusive
*/
private int parseValue(String cookies, int beginIndex) {
int length = cookies.length();
int index = beginIndex;
while (index < length) {
switch (cookies.charAt(index)) {
case ";":
case ",":
// Found end of value token
tokens[numTokens] = cookies.substring(beginIndex, index).trim();
numTokens++;
return index + 1;
case """:
// Skip past quoted span
do index++; while (cookies.charAt(index) != """);
break;
}
index++;
}
// Found end of value token
tokens[numTokens] = cookies.substring(beginIndex, index).trim();
numTokens++;
return index;
}
}
</source>
Parsing and formatting HTTP dates as used in cookies and other headers.
<source lang="java">
import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Arrays; import java.util.Calendar; import java.util.Collection; import java.util.Date; import java.util.Locale; import java.util.TimeZone; /**
* A utility class for parsing and formatting HTTP dates as used in cookies and * other headers. This class handles dates as defined by RFC 2616 section * 3.3.1 as well as some other common non-standard formats. * * @author Christopher Brown * @author Michael Becke */
public final class DateUtil {
/**
* Date format pattern used to parse HTTP date headers in RFC 1123 format.
*/
public static final String PATTERN_RFC1123 = "EEE, dd MMM yyyy HH:mm:ss zzz";
/**
* Date format pattern used to parse HTTP date headers in RFC 1036 format.
*/
public static final String PATTERN_RFC1036 = "EEEE, dd-MMM-yy HH:mm:ss zzz";
/**
* Date format pattern used to parse HTTP date headers in ANSI C
* asctime() format.
*/
public static final String PATTERN_ASCTIME = "EEE MMM d HH:mm:ss yyyy";
private static final Collection<String> DEFAULT_PATTERNS = Arrays.asList(
new String[] {PATTERN_ASCTIME, PATTERN_RFC1036, PATTERN_RFC1123});
private static final Date DEFAULT_TWO_DIGIT_YEAR_START;
static {
Calendar calendar = Calendar.getInstance();
calendar.set(2000, Calendar.JANUARY, 1, 0, 0);
DEFAULT_TWO_DIGIT_YEAR_START = calendar.getTime();
}
private static final TimeZone GMT = TimeZone.getTimeZone("GMT");
/**
* This class should not be instantiated.
*/
private DateUtil() {
}
/**
* Parses a date value. The formats used for parsing the date value are retrieved from
* the default http params.
*
* @param dateValue the date value to parse
* @return the parsed date
* @throws DateParseException if the value could not be parsed using any of the
* supported date formats
*/
public static Date parseDate(String dateValue) {
return parseDate(dateValue, null, null);
}
/**
* Parses the date value using the given date formats.
*
* @param dateValue the date value to parse
* @param dateFormats the date formats to use
* @return the parsed date
* @throws DateParseException if none of the dataFormats could parse the dateValue
*/
public static Date parseDate(String dateValue, Collection<String> dateFormats)
{
return parseDate(dateValue, dateFormats, null);
}
/**
* Parses the date value using the given date formats.
*
* @param dateValue the date value to parse
* @param dateFormats the date formats to use
* @param startDate During parsing, two digit years will be placed in the range
* startDate to startDate + 100 years. This value may
* be null. When null is given as a parameter, year
* 2000 will be used.
* @return the parsed date
* @throws DateParseException if none of the dataFormats could parse the dateValue
*/
public static Date parseDate(
String dateValue,
Collection<String> dateFormats,
Date startDate
) {
if (dateValue == null) {
throw new IllegalArgumentException("dateValue is null");
}
if (dateFormats == null) {
dateFormats = DEFAULT_PATTERNS;
}
if (startDate == null) {
startDate = DEFAULT_TWO_DIGIT_YEAR_START;
}
// trim single quotes around date if present
// see issue #5279
if (dateValue.length() > 1
&& dateValue.startsWith(""")
&& dateValue.endsWith(""")
) {
dateValue = dateValue.substring(1, dateValue.length() - 1);
}
SimpleDateFormat dateParser = null;
for (String format : dateFormats) {
if (dateParser == null) {
dateParser = new SimpleDateFormat(format, Locale.US);
dateParser.setTimeZone(TimeZone.getTimeZone("GMT"));
dateParser.set2DigitYearStart(startDate);
} else {
dateParser.applyPattern(format);
}
try {
return dateParser.parse(dateValue);
} catch (ParseException pe) {
// ignore this exception, we will try the next format
}
}
// we were unable to parse the date
throw new RuntimeException("Unable to parse the date " + dateValue);
}
/**
* Formats the given date according to the RFC 1123 pattern.
*
* @param date The date to format.
* @return An RFC 1123 formatted date string.
* @see #PATTERN_RFC1123
*/
public static String formatDate(Date date) {
return formatDate(date, PATTERN_RFC1123);
}
/**
* Formats the given date according to the specified pattern. The pattern
* must conform to that used by the {@link SimpleDateFormat simple date
* format} class.
*
* @param date The date to format.
* @param pattern The pattern to use for formatting the date.
* @return A formatted date string.
* @throws IllegalArgumentException If the given date pattern is invalid.
* @see SimpleDateFormat
*/
public static String formatDate(Date date, String pattern) {
if (date == null) {
throw new IllegalArgumentException("date is null");
}
if (pattern == null) {
throw new IllegalArgumentException("pattern is null");
}
SimpleDateFormat formatter = new SimpleDateFormat(pattern, Locale.US);
formatter.setTimeZone(GMT);
return formatter.format(date);
}
}
</source>
Setting and Reading Cookies
<source lang="java">
import java.io.*; import javax.servlet.*; import javax.servlet.http.*; public class SettingandReadingCookies extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException
{
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<HTML>");
out.println("<HEAD>");
out.println("<TITLE>");
out.println("A Web Page");
out.println("</TITLE>");
out.println("</HEAD>");
out.println("<BODY");
Cookie[] cookies = request.getCookies();
boolean foundCookie = false;
for(int loopIndex = 0; loopIndex < cookies.length; loopIndex++) {
Cookie cookie1 = cookies[loopIndex];
if (cookie1.getName().equals("color")) {
out.println("bgcolor = " + cookie1.getValue());
foundCookie = true;
}
}
if (!foundCookie) {
Cookie cookie1 = new Cookie("color", "cyan");
cookie1.setMaxAge(24*60*60);
response.addCookie(cookie1);
}
out.println(">");
out.println("Setting and Reading Cookies
"); out.println("This page will set its background color using a cookie when reloaded.");
out.println("</BODY>");
out.println("</HTML>");
} }
</source>
Utilities for finding and manipulating cookies
<source lang="java">
/*
* Copyright (c) 2003-2006, Simon Brown * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * - Neither the name of Pebble nor the names of its contributors may * be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */
import javax.servlet.http.Cookie; import javax.servlet.http.HttpServletResponse; /**
* Utilities for finding and manipulating cookies. * * @author Simon Brown */
public class CookieUtils {
/** represents 4 weeks in seconds */
public static final int ONE_MONTH = 60 * 60 * 24 * 28;
/**
* Gets a reference to a named cookie from an array of cookies.
*
* @param cookies an array of cookies
* @param name the name of the cookie to find
* @return a reference to a Cookie, or null if the cookie couldn"t be found
*/
public static Cookie getCookie(Cookie cookies[], String name) {
if (cookies != null) {
for (Cookie cookie : cookies) {
if (cookie.getName().equals(name)) {
return cookie;
}
}
}
// we"ve got this far so the specified cookie wasn"t found
return null;
}
/**
* Adds a cookie with the specified name, value and expiry.
*
* @param response the HttpServletResponse to add the cookie to
* @param name the name of the cookie
* @param value the value of the cookie
* @param maxAge the maxAge of the cookie (in seconds)
*/
public static void addCookie(HttpServletResponse response, String name, String value, int maxAge) {
Cookie cookie = new Cookie(name, value);
cookie.setMaxAge(maxAge);
response.addCookie(cookie);
}
/**
* Removes a cookie with the specified name.
*
* @param response the HttpServletResponse to remove the cookie from
* @param name the name of the cookie
*/
public static void removeCookie(HttpServletResponse response, String name) {
addCookie(response, name, "", 0);
}
}
</source>
