struts-logic.tld

ActionServlet源码 struts的一个步骤都有 知道本来有视频的太大了 就没有上传了

            </description>
        </attribute>
        <attribute>
            <name>property</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
            <description>
                <![CDATA[
      <p>The variable to be matched is the property (of the bean specified
      by the <code>name</code> attribute) specified by this attribute.
      The property reference can be simple, nested, and/or indexed.</p>
      ]]>
            </description>
        </attribute>
        <attribute>
            <name>scope</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
            <description>
                <![CDATA[
      <p>The bean scope within which to search for the bean named by the
      <code>name</code> property, or "any scope" if not specified.</p>
      ]]>
            </description>
        </attribute>
        <attribute>
            <name>value</name>
            <required>true</required>
            <rtexprvalue>true</rtexprvalue>
            <description>
                <![CDATA[
      <p>The constant value which is checked for existence as a substring
      of the specified variable.</p>
      ]]>
            </description>
        </attribute>
    </tag>
    <tag>
        <name>notPresent</name>
        <tag-class>org.apache.struts.taglib.logic.NotPresentTag</tag-class>
        <body-content>JSP</body-content>
        <description>
            <![CDATA[
            <p><strong>
    Generate the nested body content of this tag if the specified
    value is not present in this request.
    </strong></p>
          
    <p>Depending on which attribute is specified, this tag checks the
    current request, and evaluates the nested body content of this tag
    only if the specified value <strong>is not</strong> present.  Only one
    of the attributes may be used in one occurrence of this tag, unless
    you use the <code>property</code> attribute, in which case the
    <code>name</code> attribute is also required.</p>
    ]]>
        </description>
        <attribute>
            <name>cookie</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
            <description>
                <![CDATA[
      <p>Checks for the existence of a cookie with the specified name.</p>
      ]]>
            </description>
        </attribute>
        <attribute>
            <name>header</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
            <description>
                <![CDATA[
      <p>Checks for the existence of an HTTP header with the specified
      name.  The name match is performed in a case insensitive manner.</p>
      ]]>
            </description>
        </attribute>
        <attribute>
            <name>name</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
            <description>
                <![CDATA[
      <p>Checks for the existence of a JSP bean, in any scope, with the
      specified name.  If <code>property</code> is also specified, checks
      for a non-null property value for the specified property.</p>
      ]]>
            </description>
        </attribute>
        <attribute>
            <name>parameter</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
            <description>
                <![CDATA[
      <p>Checks for the existence of at least one occurrence of the
      specified request parameter on this request, even if the parameter
      value is a zero-length string.</p>
      ]]>
            </description>
        </attribute>
        <attribute>
            <name>property</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
            <description>
                <![CDATA[
      <p>Checks for the existence of a non-null property value, returned
      by a property getter method on the JSP bean (in any scope) that is
      specified by the <code>name</code> attribute.  Property references
      can be simple, nested, and/or indexed.</p>
      ]]>
            </description>
        </attribute>
        <attribute>
            <name>role</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
            <description>
                <![CDATA[
      <p>Checks whether the currently authenticated user (if any) has been
      associated with the specified security role.</p>
      ]]>
            </description>
        </attribute>
        <attribute>
            <name>scope</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
            <description>
                <![CDATA[
      <p>The bean scope within which to search for the bean named by the
      <code>name</code> property, or "any scope" if not specified.</p>
      ]]>
            </description>
        </attribute>
        <attribute>
            <name>user</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
            <description>
                <![CDATA[
      <p>Checks whether the currently authenticated user principal has the
      specified name.</p>
      ]]>
            </description>
        </attribute>
    </tag>
    <tag>
        <name>present</name>
        <tag-class>org.apache.struts.taglib.logic.PresentTag</tag-class>
        <body-content>JSP</body-content>
        <description>
            <![CDATA[
            <p><strong>
    Generate the nested body content of this tag if the specified
    value is present in this request.
    </strong></p>
          
    <p>Depending on which attribute is specified, this tag checks the
    current request, and evaluates the nested body content of this tag
    only if the specified value <strong>is</strong> present.  Only one
    of the attributes may be used in one occurrence of this tag, unless
    you use the <code>property</code> attribute, in which case the
    <code>name</code> attribute is also required.</p>
    ]]>
        </description>
        <attribute>
            <name>cookie</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
            <description>
                <![CDATA[
      <p>Checks for the existence of a cookie with the specified name.</p>
      ]]>
            </description>
        </attribute>
        <attribute>
            <name>header</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
            <description>
                <![CDATA[
      <p>Checks for the existence of an HTTP header with the specified
      name.  The name match is performed in a case insensitive manner.</p>
      ]]>
            </description>
        </attribute>
        <attribute>
            <name>name</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
            <description>
                <![CDATA[
      <p>Checks for the existence of a JSP bean, in any scope, with the
      specified name.  If <code>property</code> is also specified, checks
      for a non-null property value for the specified property.</p>
      ]]>
            </description>
        </attribute>
        <attribute>
            <name>parameter</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
            <description>
                <![CDATA[
      <p>Checks for the existence of at least one occurrence of the
      specified request parameter on this request, even if the parameter
      value is a zero-length string.</p>
      ]]>
            </description>
        </attribute>
        <attribute>
            <name>property</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
            <description>
                <![CDATA[
      <p>Checks for the existence of a non-null property value, returned
      by a property getter method on the JSP bean (in any scope) that is
      specified by the <code>name</code> attribute.  Property references
      can be simple, nested, and/or indexed.</p>
      ]]>
            </description>
        </attribute>
        <attribute>
            <name>role</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
            <description>
                <![CDATA[
      <p>Checks whether the currently authenticated user (if any) has been
      associated with any of the specified security roles. Use a comma-delimited
      list to check for multiple roles. Example:
      <code>&lt;logic:present role="role1,role2,role3"&gt;
                code.....
            &lt;/logic:present&gt;</code></p>
      ]]>
            </description>
        </attribute>
        <attribute>
            <name>scope</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
            <description>
                <![CDATA[
      <p>The bean scope within which to search for the bean named by the
      <code>name</code> property, or "any scope" if not specified.</p>
      ]]>
            </description>
        </attribute>
        <attribute>
            <name>user</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
            <description>
                <![CDATA[
      <p>Checks whether the currently authenticated user principal has the
      specified name.</p>
      ]]>
            </description>
        </attribute>
    </tag>
    <tag>
        <name>redirect</name>
        <tag-class>org.apache.struts.taglib.logic.RedirectTag</tag-class>
        <description>
            <![CDATA[
            <p><strong>Render an HTTP Redirect</strong></p>
          

                <p>Performs an <code>HttpServletResponse.sendRedirect()</code>
                call to the hyperlink specified by the attributes to this
                tag.  URL rewriting will be applied automatically, to
                maintain session state in the absence of cookies.</p>

                <p>The base URL for this redirect is calculated based on
                which of the following attributes you specify (you must
                specify exactly one of them):</p>
                <ul>
                <li><em>forward</em> - Use the value of this attribute as the
                    name of a global <code>ActionForward</code> to be looked
                    up, and use the module-relative or context-relative
                    URI found there.</li>
                <li><em>href</em> - Use the value of this attribute unchanged.
                    </li>
                <li><em>page</em> - Use the value of this attribute as an
                    module-relative URI, and generate a server-relative
                    URI by including the context path.</li>
                </ul>

                <p>Normally, the redirect you specify with one of the
                attributes described in the previous paragraph will be left
                unchanged (other than URL rewriting if necessary).  However,
                there are two ways you can append one or more dynamically
                defined query parameters to the hyperlink -- specify a single
                parameter with the <code>paramId</code> attribute (and its
                associated attributes to select the value), or specify the
                <code>name</code> (and optional <code>property</code>)
                attributes to select a <code>java.util.Map</code> bean that
                contains one or more parameter ids and corresponding values.
                </p>

                <p>To specify a single parameter, use the <code>paramId</code>
                attribute to define the name of the request parameter to be
                submitted.  To specify the corresponding value, use one of the
                following approaches:</p>
                <ul>
                <li><em>Specify only the <code>paramName</code> attribute</em>
                    - The named JSP bean (optionally scoped by the value of the
                    <code>paramScope</code> attribute) must identify a value
                    that can be converted to a String.</li>
                <li><em>Specify both the <code>paramName</code> and
                    <code>paramProperty</code> attributes</em> - The specified
                    property getter method will be called on the JSP bean
                    identified by the <code>paramName</code> (and optional
                    <code>paramScope</code>) attributes, in order to select
                    a value that can be converted to a String.</li>
                </ul>

                <p>If you prefer to specify a <code>java.util.Map</code> that
                contains all of the request parameters to be added to the
                hyperlink, use one of the following techniques:</p>
                <ul>
                <li><em>Specify only the <code>name</code> attribute</em> -
                    The named JSP bean (optionally scoped by the value of
                    the <code>scope</code> attribute) must identify a
                    <code>java.util.Map</code> containing the parameters.</li>
                <li><em>Specify both <code>name</code> and
                    <code>property</code> attributes</em> - The specified
                    property getter method will be called on the bean
                    identified by the <code>name</code> (and opt