# Class Util

java.lang.Object
org.apache.jasper.tagplugins.jstl.Util

public class Util extends Object
Util contains some often used consts, static methods and embedded class to support the JSTL tag plugin.

- ## Nested Class Summary

  Nested Classes
  Modifier and Type
  Class
  Description
  `static class`
  `Util.ImportResponseWrapper`
  Wraps responses to allow us to retrieve results as Strings.

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `static final String`
  `DEFAULT_ENCODING`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `Util()`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `static String`
  `escapeXml(char[] arrayBuffer, int length)`
  `static String`
  `escapeXml(String buffer)`
  Performs the following substring replacements (to facilitate output to XML/HTML pages): `&` -> `&amp` `<` -> `&lt;` `>` -> `&gt;` `"` -> `&#034;` `'` -> `&#039;` See also OutSupport.writeEscapedXml(). taken from org.apache.taglibs.standard.tag.common.core.Util
  `static String`
  `getContentTypeAttribute(String input, String name)`
  Get the value associated with a content-type attribute.
  `static int`
  `getScope(String scope)`
  Converts the given string description of a scope to the corresponding PageContext constant.
  `static boolean`
  `isAbsoluteUrl(String url)`
  Returns `true` if our current URL is absolute, `false` otherwise. taken from org.apache.taglibs.standard.tag.common.core.ImportSupport
  `static String`
  `resolveUrl(String url, String context, PageContext pageContext)`
  Utility methods taken from org.apache.taglibs.standard.tag.common.core.UrlSupport
  `static String`
  `stripSession(String url)`
  Strips a servlet session ID from `url`.

  ### Methods inherited from class Object

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

- ## Field Details

  - ### DEFAULT_ENCODING

    public static final String DEFAULT_ENCODING
    See Also:
      - Constant Field Values

- ## Constructor Details

  - ### Util

    public Util()

- ## Method Details

  - ### getScope

    public static int getScope(String scope)
    Converts the given string description of a scope to the corresponding PageContext constant. The validity of the given scope has already been checked by the appropriate TLV.
    Parameters:
      `scope` - String description of scope
    Returns:
      PageContext constant corresponding to given scope description taken from org.apache.taglibs.standard.tag.common.core.Util

  - ### isAbsoluteUrl

    public static boolean isAbsoluteUrl(String url)
    Returns `true` if our current URL is absolute, `false` otherwise. taken from org.apache.taglibs.standard.tag.common.core.ImportSupport
    Parameters:
      `url` - The URL
    Returns:
      `true` if the URL is absolute

  - ### getContentTypeAttribute

    public static String getContentTypeAttribute(String input, String name)
    Get the value associated with a content-type attribute. Syntax defined in RFC 2045, section 5.1. taken from org.apache.taglibs.standard.tag.common.core.Util
    Parameters:
      `input` - The attribute string
      `name` - The attribute name
    Returns:
      the attribute value

  - ### stripSession

    public static String stripSession(String url)
    Strips a servlet session ID from `url`. The session ID is encoded as a URL "path parameter" beginning with "jsessionid=". We thus remove anything we find between ";jsessionid=" (inclusive) and either EOS or a subsequent ';' (exclusive). taken from org.apache.taglibs.standard.tag.common.core.ImportSupport
    Parameters:
      `url` - The URL
    Returns:
      the URL without a user submitted session id parameter

  - ### escapeXml

    public static String escapeXml(String buffer)
    Performs the following substring replacements (to facilitate output to XML/HTML pages):
    - `&` -> `&amp`
    - `<` -> `&lt;`
    - `>` -> `&gt;`
    - `"` -> `&#034;`
    - `'` -> `&#039;`
    See also OutSupport.writeEscapedXml(). taken from org.apache.taglibs.standard.tag.common.core.Util
    Parameters:
      `buffer` - Data to escape
    Returns:
      escaped data

  - ### escapeXml

    public static String escapeXml(char[] arrayBuffer, int length)

  - ### resolveUrl

    public static String resolveUrl(String url, String context, PageContext pageContext) throws JspException
    Utility methods taken from org.apache.taglibs.standard.tag.common.core.UrlSupport
    Parameters:
      `url` - The URL
      `context` - The context
      `pageContext` - The page context
    Returns:
      the absolute URL
    Throws:
      `JspException` - If the URL doesn't start with '/'