让tomcat支持中文cookie

这的确是一个不正常的需求，按照规范，开发者需要将cookie进行编码，因为tomcat不支持中文cookie。

但有时候，你不得不面对这样的情况，比如请求是由他人开发的软件，比如，浏览器控件发出的。

这个时候就需要修改tomcat源码来支持了。

直接上源码

/*
* 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.
*/
package org.apache.tomcat.util.http;

/**
* Static constants for this package.
*/
public final class CookieSupport {

// --------------------------------------------------------------- Constants
/**
* If set to true, we parse cookies strictly according to the servlet,
* cookie and HTTP specs by default.
*/
public static final boolean STRICT_SERVLET_COMPLIANCE;

/**
* If true, cookie values are allowed to contain an equals character without
* being quoted.
*/
public static final boolean ALLOW_EQUALS_IN_VALUE;

/**
* If true, separators that are not explicitly dis-allowed by the v0 cookie
* spec but are disallowed by the HTTP spec will be allowed in v0 cookie
* names and values. These characters are: \"()/:<=>?@[\\]{} Note that the
* inclusion of / depends on the value of {@link #FWD_SLASH_IS_SEPARATOR}.
*/
public static final boolean ALLOW_HTTP_SEPARATORS_IN_V0;

/**
* If set to false, we don't use the IE6/7 Max-Age/Expires work around.
* Default is usually true. If STRICT_SERVLET_COMPLIANCE==true then default
* is false. Explicitly setting always takes priority.
*/
public static final boolean ALWAYS_ADD_EXPIRES;

/**
* If set to true, the <code>/</code> character will be treated as a
* separator. Default is usually false. If STRICT_SERVLET_COMPLIANCE==true
* then default is true. Explicitly setting always takes priority.
*/
public static final boolean FWD_SLASH_IS_SEPARATOR;

/**
* If true, name only cookies will be permitted.
*/
public static final boolean ALLOW_NAME_ONLY;

/**
* If set to true, the cookie header will be preserved. In most cases
* except debugging, this is not useful.
*/
public static final boolean PRESERVE_COOKIE_HEADER;

/**
* The list of separators that apply to version 0 cookies. To quote the
* spec, these are comma, semi-colon and white-space. The HTTP spec
* definition of linear white space is [CRLF] 1*( SP | HT )
*/
private static final char[] V0_SEPARATORS = {',', ';', ' ', '\t'};
private static final boolean[] V0_SEPARATOR_FLAGS = new boolean[65536];

/**
* The list of separators that apply to version 1 cookies. This may or may
* not include '/' depending on the setting of
* {@link #FWD_SLASH_IS_SEPARATOR}.
*/
private static final char[] HTTP_SEPARATORS;
private static final boolean[] HTTP_SEPARATOR_FLAGS = new boolean[65536];

static {
STRICT_SERVLET_COMPLIANCE = Boolean.parseBoolean(System.getProperty(
"org.apache.catalina.STRICT_SERVLET_COMPLIANCE",
"false"));

ALLOW_EQUALS_IN_VALUE = Boolean.parseBoolean(System.getProperty(
"org.apache.tomcat.util.http.ServerCookie.ALLOW_EQUALS_IN_VALUE",
"false"));

ALLOW_HTTP_SEPARATORS_IN_V0 = Boolean.parseBoolean(System.getProperty(
"org.apache.tomcat.util.http.ServerCookie.ALLOW_HTTP_SEPARATORS_IN_V0",
"false"));

String alwaysAddExpires = System.getProperty(
"org.apache.tomcat.util.http.ServerCookie.ALWAYS_ADD_EXPIRES");
if (alwaysAddExpires == null) {
ALWAYS_ADD_EXPIRES = !STRICT_SERVLET_COMPLIANCE;
} else {
ALWAYS_ADD_EXPIRES = Boolean.parseBoolean(alwaysAddExpires);
}

String preserveCookieHeader = System.getProperty(
"org.apache.tomcat.util.http.ServerCookie.PRESERVE_COOKIE_HEADER");
if (preserveCookieHeader == null) {
PRESERVE_COOKIE_HEADER = STRICT_SERVLET_COMPLIANCE;
} else {
PRESERVE_COOKIE_HEADER = Boolean.parseBoolean(preserveCookieHeader);
}

String  fwdSlashIsSeparator = System.getProperty(
"org.apache.tomcat.util.http.ServerCookie.FWD_SLASH_IS_SEPARATOR");
if (fwdSlashIsSeparator == null) {
FWD_SLASH_IS_SEPARATOR = STRICT_SERVLET_COMPLIANCE;
} else {
FWD_SLASH_IS_SEPARATOR = Boolean.parseBoolean(fwdSlashIsSeparator);
}

ALLOW_NAME_ONLY = Boolean.parseBoolean(System.getProperty(
"org.apache.tomcat.util.http.ServerCookie.ALLOW_NAME_ONLY",
"false"));

/*
Excluding the '/' char by default violates the RFC, but
it looks like a lot of people put '/'
in unquoted values: '/': ; //47
'\t':9 ' ':32 '\"':34 '(':40 ')':41 ',':44 ':':58 ';':59 '<':60
'=':61 '>':62 '?':63 '@':64 '[':91 '\\':92 ']':93 '{':123 '}':125
*/
if (CookieSupport.FWD_SLASH_IS_SEPARATOR) {
HTTP_SEPARATORS = new char[] { '\t', ' ', '\"', '(', ')', ',', '/',
':', ';', '<', '=', '>', '?', '@', '[', '\\', ']', '{', '}' };
} else {
HTTP_SEPARATORS = new char[] { '\t', ' ', '\"', '(', ')', ',',
':', ';', '<', '=', '>', '?', '@', '[', '\\', ']', '{', '}' };
}
for (int i = 0; i < 65536; i++) {
V0_SEPARATOR_FLAGS[i] = false;
HTTP_SEPARATOR_FLAGS[i] = false;
}
for (int i = 0; i < V0_SEPARATORS.length; i++) {
V0_SEPARATOR_FLAGS[V0_SEPARATORS[i]] = true;
}
for (int i = 0; i < HTTP_SEPARATORS.length; i++) {
HTTP_SEPARATOR_FLAGS[HTTP_SEPARATORS[i]] = true;
}

}

// ----------------------------------------------------------------- Methods

/**
* Returns true if the byte is a separator as defined by V0 of the cookie
* spec.
*/
public static final boolean isV0Separator(final char c) {
//        if (c < 0x20 || c >= 0x7f) {
//            if (c != 0x09) {
//                throw new IllegalArgumentException(
//                        "Control character in cookie value or attribute.");
//            }
//        }

return V0_SEPARATOR_FLAGS[c];
}

public static boolean isV0Token(String value) {
if( value==null) {
return false;
}

int i = 0;
int len = value.length();

if (alreadyQuoted(value)) {
i++;
len--;
}

for (; i < len; i++) {
char c = value.charAt(i);
if (isV0Separator(c)) {
return true;
}
}
return false;
}

/**
* Returns true if the byte is a separator as defined by V1 of the cookie
* spec, RFC2109.
* @throws IllegalArgumentException if a control character was supplied as
*         input
*/
public static final boolean isHttpSeparator(final char c) {
//        if (c < 0x20 || c >= 0x7f) {
//            if (c != 0x09) {
//                throw new IllegalArgumentException(
//                        "Control character in cookie value or attribute.");
//            }
//        }

return HTTP_SEPARATOR_FLAGS[c];
}

public static boolean isHttpToken(String value) {
if( value==null) {
return false;
}

int i = 0;
int len = value.length();

if (alreadyQuoted(value)) {
i++;
len--;
}

for (; i < len; i++) {
char c = value.charAt(i);

if (isHttpSeparator(c)) {
return true;
}
}
return false;
}

public static boolean alreadyQuoted (String value) {
if (value==null || value.length() < 2) {
return false;
}
return (value.charAt(0)=='\"' && value.charAt(value.length()-1)=='\"');
}

// ------------------------------------------------------------- Constructor
private CookieSupport() {
// Utility class. Don't allow instances to be created.
}
}