org.zkoss.web.servlet
Class Servlets

java.lang.Object
  org.zkoss.web.servlet.Servlets

Direct Known Subclasses:

Https

public class Servlets
extends java.lang.Object

The servlet relevant utilities.

Author:

tomyeh

See Also:

Https, Charsets

Nested Class Summary

static interface

Servlets.ClientIdentifier A plugin used to provide additional browser information for getBrowser(javax.servlet.ServletRequest, java.lang.String).

Field Summary

static int	APPEND_PARAM Whether to append params if both uri and params contain the same parameter.
static int	IGNORE_PARAM Whether to ignore params if both uri and params contain the same parameter.
static int	OVERWRITE_URI Whether to overwrite uri if both uri and params contain the same parameter.
static int	PASS_THRU_ATTR Whether the specified parameters shall be passed thru the request attribute called arg.

Constructor Summary

protected

Servlets() Utilities; no instantiation required.

Method Summary

static ExtendletContext	addExtendletContext(javax.servlet.ServletContext ctx, java.lang.String name, ExtendletContext extctx) Adds an extended context.
static void	forward(javax.servlet.ServletContext ctx, javax.servlet.ServletRequest request, javax.servlet.ServletResponse response, java.lang.String uri) A shortcut of forward(request, response, uri, null, 0).
static void	forward(javax.servlet.ServletContext ctx, javax.servlet.ServletRequest request, javax.servlet.ServletResponse response, java.lang.String uri, java.util.Map params, int mode) Forward to the specified URI.
static java.lang.String	generateURI(java.lang.String uri, java.util.Map params, int mode) Generates URI by appending the parameters.
static java.lang.String	getBrowser(javax.servlet.ServletRequest request) Returns the name of the browser, or null if not identifiable.
static java.lang.Double	getBrowser(javax.servlet.ServletRequest request, java.lang.String name) Returns the version of the given browser name, or null if the client is not the given browsers.
static java.lang.String	getBrowser(java.lang.String userAgent) Returns the name of the browser, or null if not identifiable.
static java.lang.Double	getBrowser(java.lang.String userAgent, java.lang.String name) Returns the version of the given browser name, or null if the client is not the given browsers.
static Servlets.ClientIdentifier	getClientIdentifier() Returns the client identifier, or null if no such plugin.
static java.util.List<java.lang.String>	getContextPaths() Returns a list of context paths (e.g., "/abc") that this application has.
static java.lang.String	getDetail(javax.servlet.ServletRequest request) Returns the request detail infomation.
static ExtendletContext	getExtendletContext(javax.servlet.ServletContext ctx, java.lang.String name) Returns the extended context of the specified name.
static java.lang.String	getExtension(java.lang.String path) Returns the file/path extension of the specified path (excluding dot), or null if no extension at all.
static java.lang.String	getExtension(java.lang.String path, boolean lastOnly) Returns the file/path extension of the specified path (excluding dot), or null if no extension at all.
static double[]	getIECompatibilityInfo(javax.servlet.ServletRequest request) Returns the IE compatibility information.
static java.lang.String	getLimitTimeOffer() Returns a token to represent a limit-time offer.
static java.lang.String	getNormalPath(java.lang.String path) Returns the normal path; that is, will elminate the double dots ".."
static javax.servlet.RequestDispatcher	getRequestDispatcher(javax.servlet.ServletContext ctx, javax.servlet.ServletRequest request, java.lang.String uri, java.util.Map params, int mode) Returns the request dispatch of the specified URI.
static java.net.URL	getResource(javax.servlet.ServletContext ctx, java.lang.String uri) Returns the resource of the specified uri.
static java.io.InputStream	getResourceAsStream(javax.servlet.ServletContext ctx, java.lang.String uri) Returns the resource stream of the specified uri.
static java.lang.String	getUserAgent(javax.servlet.ServletRequest req) Returns the user-agent header, which indicates what the client is, or an empty string if not available.
static void	include(javax.servlet.ServletContext ctx, javax.servlet.ServletRequest request, javax.servlet.ServletResponse response, java.lang.String uri) A shortcut of include(request, response, uri, null, 0).
static void	include(javax.servlet.ServletContext ctx, javax.servlet.ServletRequest request, javax.servlet.ServletResponse response, java.lang.String uri, java.util.Map params, int mode) Includes the resource at the specified URI.
static boolean	isBrowser(javax.servlet.ServletRequest req, java.lang.String type) Returns whether the client is a browser of the specified type.
static boolean	isBrowser(java.lang.String userAgent, java.lang.String type) Returns whether the user agent is a browser of the specified type.
static boolean	isExplorer(javax.servlet.ServletRequest req) Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).
static boolean	isExplorer(java.lang.String userAgent) Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).
static boolean	isExplorer7(javax.servlet.ServletRequest req) Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).
static boolean	isExplorer7(java.lang.String userAgent) Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).
static boolean	isForwarded(javax.servlet.ServletRequest request) Tests whether this page is forwarded by another page.
static boolean	isGecko(javax.servlet.ServletRequest req) Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).
static boolean	isGecko(java.lang.String userAgent) Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).
static boolean	isGecko3(javax.servlet.ServletRequest req) Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).
static boolean	isGecko3(java.lang.String userAgent) Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).
static boolean	isHilDevice(javax.servlet.ServletRequest req) Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).
static boolean	isHilDevice(java.lang.String userAgent) Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).
static boolean	isIncluded(javax.servlet.ServletRequest request) Tests whether this page is included by another page.
static boolean	isOfferExpired(java.lang.String lto, int timeout) Returns whether a token returned by getLimitTimeOffer expired.
static boolean	isOpera(javax.servlet.ServletRequest req) Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).
static boolean	isOpera(java.lang.String userAgent) Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).
static boolean	isRobot(javax.servlet.ServletRequest req) Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).
static boolean	isRobot(java.lang.String userAgent) Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).
static boolean	isSafari(javax.servlet.ServletRequest req) Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).
static boolean	isSafari(java.lang.String userAgent) Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).
static boolean	isServlet23() Returns whether the current Web server supports Servlet 2.3 or above.
static boolean	isServlet24() Returns whether the current Web server supports Servlet 2.4 or above.
static boolean	isServlet3() Returns whether the current Web server supports Servlet 3.0 or above.
static boolean	isUniversalURL(java.lang.String uri) Returns whether a URL starts with xxx://, mailto:, about:, javascript:, data:
static java.lang.String	locate(javax.servlet.ServletContext ctx, javax.servlet.ServletRequest request, java.lang.String pgpath, Locator locator) Locates a page based on the current Locale.
static ExtendletContext	removeExtendletContext(javax.servlet.ServletContext ctx, java.lang.String name) Removes an extended context of the specified name.
static void	setClientIdentifier(Servlets.ClientIdentifier clientId) Sets the client identifier that is used to assist isBrowser(javax.servlet.ServletRequest, java.lang.String) to identify a client.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

OVERWRITE_URI

public static final int OVERWRITE_URI

Whether to overwrite uri if both uri and params contain the same parameter. Used by generateURI(java.lang.String, java.util.Map, int)

See Also:

Constant Field Values

IGNORE_PARAM

public static final int IGNORE_PARAM

Whether to ignore params if both uri and params contain the same parameter. Used by generateURI(java.lang.String, java.util.Map, int)

See Also:

Constant Field Values

APPEND_PARAM

public static final int APPEND_PARAM

Whether to append params if both uri and params contain the same parameter. In other words, they both appear as the final query string. Used by generateURI(java.lang.String, java.util.Map, int)

See Also:

Constant Field Values

PASS_THRU_ATTR

public static final int PASS_THRU_ATTR

Whether the specified parameters shall be passed thru the request attribute called arg.

See Also:

Constant Field Values

Constructor Detail

Servlets

protected Servlets()

Utilities; no instantiation required.

Method Detail

isUniversalURL

public static final boolean isUniversalURL(java.lang.String uri)

Returns whether a URL starts with xxx://, mailto:, about:, javascript:, data:

isServlet3

public static final boolean isServlet3()

Returns whether the current Web server supports Servlet 3.0 or above.

Since:

6.0.0

isServlet24

public static final boolean isServlet24()

Returns whether the current Web server supports Servlet 2.4 or above.

Since:

3.0.0

isServlet23

public static final boolean isServlet23()

Returns whether the current Web server supports Servlet 2.3 or above. Thus, if isServlet24() returns true, isServlet23() must return true, too.

Since:

3.0.0

locate

public static final java.lang.String locate(javax.servlet.ServletContext ctx,
                                            javax.servlet.ServletRequest request,
                                            java.lang.String pgpath,
                                            Locator locator)
                                     throws javax.servlet.ServletException

Locates a page based on the current Locale. It never returns null.

Notice that it cannot resolve a path starting with '~', and containing '*', because it cannot access the content of the other servlet context.

If an URI contains "*", it will be replaced with a proper Locale. For example, if the current Locale is zh_TW and the resource is named "ab*.cd", then it searches "ab_zh_TW.cd", "ab_zh.cd" and then "ab.cd", until any of them is found.

Note: "*" must be right before ".", or the last character. For example, "ab*.cd" and "ab*" are both correct, while "ab*cd" and "ab*\/cd" are ignored.

If an URI contains two "*", the first "*" will be replaced with a browser code and the second with a proper locale. The browser code depends on what browser the user are used to visit the web site. Currently, the code for Internet Explorer is "ie", Safari is "saf", Opera is "opr" and all others are "moz". Thus, in the above example, if the resource is named "ab**.cd" and Firefox is used, then it searches "abmoz_zh_TW.cd", "abmoz_zh.cd" and then "abmoz.cd", until any of them is found.

Note: it assumes the path as name_lang_cn_var.ext where ".ext" is optional. Example, my_zh_tw.html.jsp.

Parameters:

ctx - the servlet context to locate pages

pgpath - the page path excluding servlet name. It is OK to have the query string. It might contain "*" for current browser code and Locale.

locator - the locator used to locate resource. If null, ctx is assumed.

Returns:

the path that matches the wildcard; pgpath, otherwise never null

Throws:

javax.servlet.ServletException

See Also:

Locales.getCurrent()

setClientIdentifier

public static void setClientIdentifier(Servlets.ClientIdentifier clientId)

Sets the client identifier that is used to assist isBrowser(javax.servlet.ServletRequest, java.lang.String) to identify a client.

Notice that the client identifier must be thread-safe.

Parameters:

clientId - the client identifier. If null, only the default types are recognized.

Since:

6.0.0

See Also:

Servlets.ClientIdentifier

getClientIdentifier

public static Servlets.ClientIdentifier getClientIdentifier()

Returns the client identifier, or null if no such plugin.

Since:

6.0.0

See Also:

Servlets.ClientIdentifier

getBrowser

public static java.lang.Double getBrowser(javax.servlet.ServletRequest request,
                                          java.lang.String name)

Returns the version of the given browser name, or null if the client is not the given browsers.

Notice that, after this method is called, an attribute named zk will be stored to the request, such that you can retrieve the browser information by use of EL, such as ${zk.ie > 7}.

Parameters:

request - the request.

name - the browser's name. It includes "ie", "ff", "gecko", "webkit", "safari", "opera", "android", "mobile", "ios", "iphone", "ipad" and "ipod". And, "ff" is the same as "gecko", and "webkit" is the same as "safari".

Since:

6.0.0

getBrowser

public static java.lang.String getBrowser(javax.servlet.ServletRequest request)

Returns the name of the browser, or null if not identifiable.

Since:

6.0.0

getBrowser

public static java.lang.Double getBrowser(java.lang.String userAgent,
                                          java.lang.String name)

Returns the version of the given browser name, or null if the client is not the given browsers.

Notice that, after this method is called, an attribute named zk will be stored to the request, such that you can retrieve the browser information by use of EL, such as ${zk.ie > 7}.

Parameters:

userAgent - the user agent (i.e., the user-agent header in HTTP).

name - the browser's name. It includes "ie", "ff", "gecko", "webkit", "safari", "opera", "android", "mobile", "ios", "iphone", "ipad" and "ipod". And, "ff" is the same as "gecko", and "webit" is the same as "safari".

Since:

6.0.0

getBrowser

public static java.lang.String getBrowser(java.lang.String userAgent)

Returns the name of the browser, or null if not identifiable.

Parameters:

userAgent - the user agent (i.e., the user-agent header in HTTP).

Since:

6.0.0

isBrowser

public static boolean isBrowser(javax.servlet.ServletRequest req,
                                java.lang.String type)

Returns whether the client is a browser of the specified type.

Parameters:

type - the type of the browser. The syntax: <browser-name>[<version-number>];[-].
For example, ie9, ios and ie6-. And, ie9 means Internet Explorer 9 and later, while ie6- means Internet Explorer 6 (not prior, nor later).

Since:

3.5.1

isBrowser

public static boolean isBrowser(java.lang.String userAgent,
                                java.lang.String type)

Returns whether the user agent is a browser of the specified type.

Parameters:

userAgent - represents a client. For HTTP clients, It is the user-agent header.

type - the type of the browser, or a list of types separated by comma.
The syntax: <browser-name>[<version-number>];[-].
For example, ie9, ios and ie6-. And, ie9 means Internet Explorer 9 and later, while ie6- means Internet Explorer 6 (not prior, nor later).
If a list of types are specified (such as ie6-,ie7-), this method returns true if any of them matches (i.e., OR condition).

Since:

3.5.1

isRobot

public static final boolean isRobot(javax.servlet.ServletRequest req)

Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).

Returns whether the client is a robot (such as Web crawlers).

Because there are too many robots, it returns true if the user-agent is not recognized.

isRobot

public static final boolean isRobot(java.lang.String userAgent)

Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).

Returns whether the client is a robot (such as Web crawlers).

Because there are too many robots, it returns true if the user-agent is not recognized.

Parameters:

userAgent - represents a client. For HTTP clients, It is the user-agent header.

Since:

3.5.1

isExplorer

public static final boolean isExplorer(javax.servlet.ServletRequest req)

Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).

Returns whether the browser is Internet Explorer. If true, it also implies isExplorer7(javax.servlet.ServletRequest) is true.

isExplorer

public static final boolean isExplorer(java.lang.String userAgent)

Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).

Returns whether the browser is Internet Explorer. If true, it also implies isExplorer7(javax.servlet.ServletRequest) is true.

Parameters:

userAgent - represents a client. For HTTP clients, It is the user-agent header.

Since:

3.5.1

isExplorer7

public static final boolean isExplorer7(javax.servlet.ServletRequest req)

Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).

Returns whether the browser is Explorer 7 or later.

isExplorer7

public static final boolean isExplorer7(java.lang.String userAgent)

Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).

Returns whether the browser is Explorer 7 or later.

Parameters:

userAgent - represents a client. For HTTP clients, It is the user-agent header.

Since:

3.5.1

isGecko

public static final boolean isGecko(javax.servlet.ServletRequest req)

Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).

Returns whether the browser is Gecko based, such as Mozilla, Firefox and Camino If true, it also implies isGecko3(javax.servlet.ServletRequest) is true.

isGecko

public static final boolean isGecko(java.lang.String userAgent)

Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).

Returns whether the browser is Gecko based, such as Mozilla, Firefox and Camino If true, it also implies isGecko3(javax.servlet.ServletRequest) is true.

Parameters:

userAgent - represents a client. For HTTP clients, It is the user-agent header.

Since:

3.5.1

isGecko3

public static final boolean isGecko3(javax.servlet.ServletRequest req)

Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).

Returns whether the browser is Gecko 3 based, such as Firefox 3.

Since:

3.5.0

isGecko3

public static final boolean isGecko3(java.lang.String userAgent)

Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).

Returns whether the browser is Gecko 3 based, such as Firefox 3.

Parameters:

userAgent - represents a client. For HTTP clients, It is the user-agent header.

Since:

3.5.1

isSafari

public static final boolean isSafari(javax.servlet.ServletRequest req)

Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).

Returns whether the browser is Safari.

isSafari

public static final boolean isSafari(java.lang.String userAgent)

Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).

Returns whether the browser is Safari.

Parameters:

userAgent - represents a client. For HTTP clients, It is the user-agent header.

Since:

3.5.1

isOpera

public static final boolean isOpera(javax.servlet.ServletRequest req)

Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).

Returns whether the browser is Opera.

isOpera

public static final boolean isOpera(java.lang.String userAgent)

Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).

Returns whether the browser is Opera.

Parameters:

userAgent - represents a client. For HTTP clients, It is the user-agent header.

Since:

3.5.1

isHilDevice

public static final boolean isHilDevice(javax.servlet.ServletRequest req)

Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).

Returns whether the client is a mobile device supporting HIL (Handset Interactive Language). For example, ZK Mobile for Android.

Since:

3.0.2

isHilDevice

public static final boolean isHilDevice(java.lang.String userAgent)

Deprecated. As of release 6.0.0, replaced with getBrowser(javax.servlet.ServletRequest, java.lang.String).

Returns whether the client is a mobile device supporting HIL (Handset Interactive Language). For example, ZK Mobile for Android.

Parameters:

userAgent - represents a client. For HTTP clients, It is the user-agent header.

Since:

3.5.1

getIECompatibilityInfo

public static double[] getIECompatibilityInfo(javax.servlet.ServletRequest request)

Returns the IE compatibility information.

Parameters:

request -

Returns:

three double values in array [ie version, trident version, ie real version]

Since:

6.5.5

getUserAgent

public static final java.lang.String getUserAgent(javax.servlet.ServletRequest req)

Returns the user-agent header, which indicates what the client is, or an empty string if not available.

Note: it doesn't return null, so it is easy to test what the client is with String.indexOf(int).

Since:

3.0.2

isIncluded

public static final boolean isIncluded(javax.servlet.ServletRequest request)

Tests whether this page is included by another page.

isForwarded

public static final boolean isForwarded(javax.servlet.ServletRequest request)

Tests whether this page is forwarded by another page.

forward

public static final void forward(javax.servlet.ServletContext ctx,
                                 javax.servlet.ServletRequest request,
                                 javax.servlet.ServletResponse response,
                                 java.lang.String uri,
                                 java.util.Map params,
                                 int mode)
                          throws java.io.IOException,
                                 javax.servlet.ServletException

Forward to the specified URI. It enhances RequestDispatcher in the following ways.

• It handles "~ctx"" where ctx is the context path of the foreign context. It is called foreign URI.
• It detects whether the page calling this method is included by another servlet/page. If so, it uses RequestDispatcher.include() instead of RequestDispatcher.forward().
• The forwarded page could accept additional parameters -- actually converting parameters to a query string and appending it to uri.
• In additions, it does HTTP encoding, i.e., converts '+' and other characters to comply HTTP.

NOTE: don't include query parameters in uri.

Parameters:

ctx - the servlet context. If null, uri cannot be foreign URI. It is ignored if URI is relevant (neither starts with '/' nor '~').

uri - the URI to include. It is OK to relevant (without leading '/'). If starts with "/", the context path of request is assumed. To reference to foreign context, use "~ctx" where ctx is the context path of the foreign context (without leading '/'). If it could be any context path recognized by the Web container or any name registered with addExtendletContext(javax.servlet.ServletContext, java.lang.String, org.zkoss.web.util.resource.ExtendletContext).
Notice that, since 3.6.3, uri could contain '*' (to denote locale and browser). Refer to locate(javax.servlet.ServletContext, javax.servlet.ServletRequest, java.lang.String, org.zkoss.util.resource.Locator).

params - the parameter map; null to ignore

mode - one of OVERWRITE_URI, IGNORE_PARAM, and APPEND_PARAM. It defines how to handle if both uri and params contains the same parameter.

Throws:

java.io.IOException

javax.servlet.ServletException

forward

public static final void forward(javax.servlet.ServletContext ctx,
                                 javax.servlet.ServletRequest request,
                                 javax.servlet.ServletResponse response,
                                 java.lang.String uri)
                          throws java.io.IOException,
                                 javax.servlet.ServletException

A shortcut of forward(request, response, uri, null, 0).

Throws:

java.io.IOException

javax.servlet.ServletException

include

public static final void include(javax.servlet.ServletContext ctx,
                                 javax.servlet.ServletRequest request,
                                 javax.servlet.ServletResponse response,
                                 java.lang.String uri,
                                 java.util.Map params,
                                 int mode)
                          throws java.io.IOException,
                                 javax.servlet.ServletException

Includes the resource at the specified URI. It enhances RequestDispatcher to allow the inclusion with a parameter map -- acutually converting parameters to a query string and appending it to uri.

NOTE: don't include query parameters in uri.

Parameters:

ctx - the servlet context. If null, uri cannot be foreign URI. It is ignored if URI is relevant (neither starts with '/' nor '~').

uri - the URI to include. It is OK to relevant (without leading '/'). If starts with "/", the context path of request is assumed. To reference to foreign context, use "~ctx/" where ctx is the context path of the foreign context (without leading '/').
Notice that, since 3.6.3, uri could contain '*' (to denote locale and browser). Refer to locate(javax.servlet.ServletContext, javax.servlet.ServletRequest, java.lang.String, org.zkoss.util.resource.Locator).

params - the parameter map; null to ignore

mode - one of OVERWRITE_URI, IGNORE_PARAM, and APPEND_PARAM. It defines how to handle if both uri and params contains the same parameter.

Throws:

java.io.IOException

javax.servlet.ServletException

include

public static final void include(javax.servlet.ServletContext ctx,
                                 javax.servlet.ServletRequest request,
                                 javax.servlet.ServletResponse response,
                                 java.lang.String uri)
                          throws java.io.IOException,
                                 javax.servlet.ServletException

A shortcut of include(request, response, uri, null, 0).

Throws:

java.io.IOException

javax.servlet.ServletException

getRequestDispatcher

public static final javax.servlet.RequestDispatcher getRequestDispatcher(javax.servlet.ServletContext ctx,
                                                                         javax.servlet.ServletRequest request,
                                                                         java.lang.String uri,
                                                                         java.util.Map params,
                                                                         int mode)
                                                                  throws javax.servlet.ServletException

Returns the request dispatch of the specified URI.

Parameters:

ctx - the servlet context. If null, uri cannot be foreign URI. It is ignored if uri is relevant (neither starts with '/' nor '~').

request - the request. If null, uri cannot be relevant. It is used only if uri is relevant.

uri - the URI to include. It is OK to relevant (without leading '/'). If starts with "/", the context path of request is assumed. To reference to foreign context, use "~ctx/" where ctx is the context path of the foreign context (without leading '/').

params - the parameter map; null to ignore

mode - one of OVERWRITE_URI, IGNORE_PARAM, and APPEND_PARAM. It defines how to handle if both uri and params contains the same parameter.

Throws:

javax.servlet.ServletException

getResource

public static final java.net.URL getResource(javax.servlet.ServletContext ctx,
                                             java.lang.String uri)

Returns the resource of the specified uri. Unlike ServletContext.getResource, it handles "~" like getRequestDispatcher(javax.servlet.ServletContext, javax.servlet.ServletRequest, java.lang.String, java.util.Map, int) did.

Since 5.0.7, file://, http://, https:// and ftp:// are supported.

getResourceAsStream

public static final java.io.InputStream getResourceAsStream(javax.servlet.ServletContext ctx,
                                                            java.lang.String uri)
                                                     throws java.io.IOException

Returns the resource stream of the specified uri. Unlike ServletContext.getResource, it handles "~" like getRequestDispatcher(javax.servlet.ServletContext, javax.servlet.ServletRequest, java.lang.String, java.util.Map, int) did.

Since 5.0.7, file://, http://, https:// and ftp:// are supported.

Throws:

java.io.IOException

generateURI

public static final java.lang.String generateURI(java.lang.String uri,
                                                 java.util.Map params,
                                                 int mode)

Generates URI by appending the parameters. Note: it doesn't support the ~xxx/ format.

Parameters:

params - the parameters to apend to the query string

mode - one of OVERWRITE_URI, IGNORE_PARAM, APPEND_PARAM and PASS_THRU_ATTR. It defines how to handle if both uri and params contains the same parameter. mode is used only if both uri contains query string and params is not empty.

See Also:

Encodes.encodeURL(ServletContext, ServletRequest, ServletResponse, String)

getContextPaths

public static final java.util.List<java.lang.String> getContextPaths()

Returns a list of context paths (e.g., "/abc") that this application has. This implementation parse application.xml. For war that doesn't contain application.xml might have to override this method and parse another file to know what context being loaded.

getLimitTimeOffer

public static final java.lang.String getLimitTimeOffer()

Returns a token to represent a limit-time offer. It is mainly used as an parameter value (mostlycalled zk_lto), and then you could verify whether it is expired by isOfferExpired(java.lang.String, int).

isOfferExpired

public static final boolean isOfferExpired(java.lang.String lto,
                                           int timeout)

Returns whether a token returned by getLimitTimeOffer expired.

Parameters:

timeout - how long the office shall expire, unit: seconds.

addExtendletContext

public static final ExtendletContext addExtendletContext(javax.servlet.ServletContext ctx,
                                                         java.lang.String name,
                                                         ExtendletContext extctx)

Adds an extended context.

Returns:

the previous extended context, if any, associated with the specified name.

removeExtendletContext

public static final ExtendletContext removeExtendletContext(javax.servlet.ServletContext ctx,
                                                            java.lang.String name)

Removes an extended context of the specified name.

getExtendletContext

public static final ExtendletContext getExtendletContext(javax.servlet.ServletContext ctx,
                                                         java.lang.String name)

Returns the extended context of the specified name.

getExtension

public static final java.lang.String getExtension(java.lang.String path)

Returns the file/path extension of the specified path (excluding dot), or null if no extension at all.

Note: the extension is converted to the lower case.

Parameters:

path - the path. If path is null, null is returned.

Since:

2.4.1

See Also:

getExtension(String, boolean)

getExtension

public static final java.lang.String getExtension(java.lang.String path,
                                                  boolean lastOnly)

Returns the file/path extension of the specified path (excluding dot), or null if no extension at all.

Note: the extension is converted to the lower case.

The result is the same for both getExtension(String) and getExtension(String, boolean), if the path has only one dot. However, if there are more than one dot, e.g., /a/b.c.d, then getExtension(String) retrieves the last extension, that is, d in this example. On the other hand, if you invoke getExtension(path, false), it returns the complete extension, that is, c.d in this example.

Parameters:

path - the path. If path is null, null is returned.

lastOnly - whether to return the last portion of extensioin if there are two or more dots. In other wors, getExtension(path) is the same as getExtension(path, true).

Since:

3.5.1

getDetail

public static java.lang.String getDetail(javax.servlet.ServletRequest request)

Returns the request detail infomation. It is used to log the debug info.

Since:

3.0.5

getNormalPath

public static java.lang.String getNormalPath(java.lang.String path)

Returns the normal path; that is, will elminate the double dots ".."(parent) and single dot "."(current) in the path as possible. e.g. /abc/../def would be normalized to /def; /abc/./def would be normalized to /abc/def; /abc//def would be normalized to /abc/def.

Note that if found no way to navigate the path, it is deemed as an illegal path. e.g. /../abc or /../../abc is deemed as illegal path since we don't know how to continue doing the normalize.

Since:

3.6.2