org.zkoss.zk.fn

Class JspFns

java.lang.Object

org.zkoss.zk.fn.JspFns

public class JspFns
extends java.lang.Object

Utilities to generate ZK related information in JSP pages.

For DSP pages, use DspFns instead.
For ZUML pages, use ZkFns instead.

Since:

3.5.2

Author:

tomyeh

Constructor Summary

Constructors

Constructor and Description
JspFns()

Method Summary

Modifier and Type	Method and Description
static java.lang.String	outDeviceCSSContent(javax.servlet.ServletContext ctx, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, java.lang.String deviceType) Generates and returns the complete CSS content of all components in the specified device.
static java.lang.String	outDeviceJavaScripts(javax.servlet.ServletContext ctx, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, java.lang.String deviceType) Returns HTML tags to include JavaScript files of the specified device for the current application (never null).
static java.lang.String	outDeviceStyleSheets(javax.servlet.ServletContext ctx, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, java.lang.String deviceType) Returns HTML tags to include style sheets of the specified device for the current application (never null).
static java.lang.String	outZkHtmlTags(javax.servlet.ServletContext ctx, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, java.lang.String deviceType) Generates and returns the ZK specific HTML tags such as stylesheet and JavaScript.
static void	setCacheControl(javax.servlet.http.HttpServletResponse response, java.lang.String prop, int hours) Sets the Cache-Control, Expires, and Last-Modified headers for the response.
static boolean	setCacheControl(javax.servlet.ServletContext context, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, java.lang.String prop, int hours) Sets the Cache-Control, Expires, and Etag headers for the response.
static void	setCSSCacheControl(javax.servlet.http.HttpServletResponse response) Sets the Cache-Control, Expires, and Last-Modified headers for the CSS files of class Web resources.
static boolean	setCSSCacheControl(javax.servlet.ServletContext context, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) Sets the Cache-Control, Expires, and Etag headers for the CSS files of class Web resources.
static void	setCWRCacheControl(javax.servlet.http.HttpServletResponse response) Sets the Cache-Control, Expires, and Last-Modified headers for class Web resources.
static boolean	setCWRCacheControl(javax.servlet.ServletContext context, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) Sets the Cache-Control, Expires, and Etag headers for class Web resources.

Methods inherited from class java.lang.Object

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

Constructor Detail

JspFns

public JspFns()

Method Detail

outZkHtmlTags

public static java.lang.String outZkHtmlTags(javax.servlet.ServletContext ctx,
                                             javax.servlet.http.HttpServletRequest request,
                                             javax.servlet.http.HttpServletResponse response,
                                             java.lang.String deviceType)

Generates and returns the ZK specific HTML tags such as stylesheet and JavaScript. If you want to generate HTML HEAD and BODY tags by yourself in a non-ZUML page (e.g., JSP or DSP), you can invoke this method at the location you want (such as inside the HTML HEAD tag).

Parameters:

deviceType - the device type. If null, ajax is assumed.

Returns:

the string holding the HTML tags, or null if already generated.

outDeviceCSSContent

public static java.lang.String outDeviceCSSContent(javax.servlet.ServletContext ctx,
                                                   javax.servlet.http.HttpServletRequest request,
                                                   javax.servlet.http.HttpServletResponse response,
                                                   java.lang.String deviceType)

Generates and returns the complete CSS content of all components in the specified device.

Notice that it generates the content, while outDeviceStyleSheets(javax.servlet.ServletContext, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.String) generates the HTML tag that will include the content.

Since:

5.0.0

outDeviceStyleSheets

public static final java.lang.String outDeviceStyleSheets(javax.servlet.ServletContext ctx,
                                                          javax.servlet.http.HttpServletRequest request,
                                                          javax.servlet.http.HttpServletResponse response,
                                                          java.lang.String deviceType)

Returns HTML tags to include style sheets of the specified device for the current application (never null).

This method is used for JSP pages.

Parameters:

deviceType - the device type. If null, ajax is assumed.

outDeviceJavaScripts

public static final java.lang.String outDeviceJavaScripts(javax.servlet.ServletContext ctx,
                                                          javax.servlet.http.HttpServletRequest request,
                                                          javax.servlet.http.HttpServletResponse response,
                                                          java.lang.String deviceType)

Returns HTML tags to include JavaScript files of the specified device for the current application (never null).

Since:

5.0.0

setCacheControl

public static void setCacheControl(javax.servlet.http.HttpServletResponse response,
                                   java.lang.String prop,
                                   int hours)

Sets the Cache-Control, Expires, and Last-Modified headers for the response.

Last-Modified is a "weak" caching header in that the browser applies a heuristic to determine whether to fetch the item from cache or not. Use setCacheControl(ServletContext, HttpServletRequest, HttpServletResponse, String, int) instead.

Parameters:

response - the servlet response (never null)

prop - the name of the property to check if the headers shall be generated. If null, it is always generated. If "false" is specified with this property, this method won't generate anything. In other words, "false" means to disable the cache. If It is used for debugging/developing purpose.

hours - the number of hours the client is allowed to cache the resource

Since:

3.6.3

See Also:

setCacheControl(ServletContext, HttpServletRequest, HttpServletResponse, String, int)

setCacheControl

public static boolean setCacheControl(javax.servlet.ServletContext context,
                                      javax.servlet.http.HttpServletRequest request,
                                      javax.servlet.http.HttpServletResponse response,
                                      java.lang.String prop,
                                      int hours)

Sets the Cache-Control, Expires, and Etag headers for the response.

Parameters:

context - the servlet context (never null)

request - the servlet request (never null)

response - the servlet response (never null)

prop - the name of the propery to check if the headers shall be generated. If null, it is always generated. If "false" is specified with this property, this method won't generate anything. In other words, "false" means to disable the cache. If It is used for debugging/developing purpose.

hours - the number of hours the client is allowed to cache the resource

Returns:

whether HttpServletResponse.SC_NOT_MODIFIED is set.

Since:

5.0.1

setCSSCacheControl

public static void setCSSCacheControl(javax.servlet.http.HttpServletResponse response)

Sets the Cache-Control, Expires, and Last-Modified headers for the CSS files of class Web resources.

Last-Modified is a "weak" caching header in that the browser applies a heuristic to determine whether to fetch the item from cache or not. Use setCSSCacheControl(ServletContext, HttpServletRequest, HttpServletResponse) instead.

It first check if org.zkoss.web.classWebResource.cache is turned off, and then check how many hours specified in org.zkoss.web.classWebResource.cache.CSS.hours. If it is turned off or the value of hours is non-positive, nothing is generated Otherwise, it generates the header with the specified hours (default: 8760).

Since:

3.6.3

See Also:

setCWRCacheControl(javax.servlet.http.HttpServletResponse), setCSSCacheControl(ServletContext, HttpServletRequest, HttpServletResponse)

setCSSCacheControl

public static boolean setCSSCacheControl(javax.servlet.ServletContext context,
                                         javax.servlet.http.HttpServletRequest request,
                                         javax.servlet.http.HttpServletResponse response)

Sets the Cache-Control, Expires, and Etag headers for the CSS files of class Web resources.

It first check if org.zkoss.web.classWebResource.cache is turned off, and then check how many hours specified in org.zkoss.web.classWebResource.cache.CSS.hours. If it is turned off or the value of hours is non-positive, nothing is generated Otherwise, it generates the header with the specified hours (default: 8760).

Returns:

whether HttpServletResponse.SC_NOT_MODIFIED is set.

Since:

5.0.1

See Also:

setCWRCacheControl(ServletContext, HttpServletRequest, HttpServletResponse)

setCWRCacheControl

public static void setCWRCacheControl(javax.servlet.http.HttpServletResponse response)

Sets the Cache-Control, Expires, and Last-Modified headers for class Web resources.

Last-Modified is a "weak" caching header in that the browser applies a heuristic to determine whether to fetch the item from cache or not. Use setCWRCacheControl(ServletContext, HttpServletRequest, HttpServletResponse) instead. It checks if org.zkoss.web.classWebResource.cache is turned off. If not, it generates the headers.

Notice that, for the CSS files, please use setCSSCacheControl(javax.servlet.http.HttpServletResponse) instead.

Since:

3.6.3

setCWRCacheControl

public static boolean setCWRCacheControl(javax.servlet.ServletContext context,
                                         javax.servlet.http.HttpServletRequest request,
                                         javax.servlet.http.HttpServletResponse response)

Sets the Cache-Control, Expires, and Etag headers for class Web resources. It checks if org.zkoss.web.classWebResource.cache is turned off. If not, it generates the headers.

Notice that, for the CSS files, please use setCSSCacheControl(javax.servlet.http.HttpServletResponse) instead.

Returns:

whether HttpServletResponse.SC_NOT_MODIFIED is set.

Since:

5.0.1