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>parameter</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
            <description>
                <![CDATA[
      <p>The variable to be compared is the first, or only, value of the
      request parameter specified by this attribute.</p>
      ]]>
            </description>
        </attribute>
        <attribute>
            <name>property</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
            <description>
                <![CDATA[
      <p>The variable to be compared 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 to which the variable, specified by other
      attribute(s) of this tag, will be compared.</p>
      ]]>
            </description>
        </attribute>
    </tag>
    <tag>
        <name>greaterThan</name>
        <tag-class>org.apache.struts.taglib.logic.GreaterThanTag</tag-class>
        <body-content>JSP</body-content>
        <description>
            <![CDATA[
            <p><strong>
    Evaluate the nested body content of this tag if the requested
    variable is greater than the specified value.
    </strong></p>
          
    <p>Compares the variable specified by one of the selector attributes
    against the specified constant value.  The nested body content of this
    tag is evaluated if the variable is <strong>greater than</strong>
    the value.</p>
    ]]>
        </description>
        <attribute>
            <name>cookie</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
            <description>
                <![CDATA[
      <p>The variable to be compared is the value of the cookie whose
      name is specified by this attribute.</p>
      ]]>
            </description>
        </attribute>
        <attribute>
            <name>header</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
            <description>
                <![CDATA[
      <p>The variable to be compared is the value of the header whose
      name is specified by this attribute.  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>The variable to be compared is the JSP bean specified by this
      attribute, if <code>property</code> is not specified, or the value
      of the specified property of this bean, if <code>property</code>
      is specified.</p>
      ]]>
            </description>
        </attribute>
        <attribute>
            <name>parameter</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
            <description>
                <![CDATA[
      <p>The variable to be compared is the first, or only, value of the
      request parameter specified by this attribute.</p>
      ]]>
            </description>
        </attribute>
        <attribute>
            <name>property</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
            <description>
                <![CDATA[
      <p>The variable to be compared is the property (of the bean specified
      by the <code>name</code> attribute) specified by this attribute.
      The property reference can be simple, nested, 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 to which the variable, specified by other
      attribute(s) of this tag, will be compared.</p>
      ]]>
            </description>
        </attribute>
    </tag>
    <tag>
        <name>iterate</name>
        <tag-class>org.apache.struts.taglib.logic.IterateTag</tag-class>
        <tei-class>org.apache.struts.taglib.logic.IterateTei</tei-class>
        <body-content>JSP</body-content>
        <description>
            <![CDATA[
            <p><strong>
    Repeat the nested body content of this tag over a specified collection.
    </strong></p>
          
    <p>Repeats the nested body content of this tag once for every element
    of the specified collection, which must be an <code>Iterator</code>,
    a <code>Collection</code>, a <code>Map</code> (whose values are to be
    iterated over), or an array.  The collection to be iterated over must be
    specified in one of the following ways:</p>
    <ul>
    <li>As a runtime expression specified as the value of the
        <code>collection</code> attribute.</li>
    <li>As a JSP bean specified by the <code>name</code> attribute.</li>
    <li>As the property, specified by the <code>property</code>, of the
        JSP bean specified by the <code>name</code> attribute.</li>
    </ul>

    <p>The collection to be iterated over MUST conform to one of the following
    requirements in order for iteration to be successful:</p>
    <ul>
    <li>An array of Java objects or primitives.</li>

    <li>An implementation of <code>java.util.Collection</code>, including
        <code>ArrayList</code> and <code>Vector</code>.</li>
    <li>An implementation of <code>java.util.Enumeration</code>.</li>
    <li>An implementation of <code>java.util.Iterator</code>.</li>
    <li>An implementation of <code>java.util.Map</code>, including
        <code>HashMap</code>, <code>Hashtable</code>, and
        <code>TreeMap</code>.  <strong>NOTE</strong> - See below for
        additional information about accessing Maps.</li>
    </ul>

    <p>Normally, each object exposed by the iterate tag is an element
    of the underlying collection you are iterating over.  However, if you
    iterate over a <code>Map</code>, the exposed object is of type
    <code>Map.Entry</code> that has two properties:</p>
    <ul>
    <li><code>key</code> - The key under which this item is stored in the
        underlying Map.</li>
    <li><code>value</code> - The value that corresponds to this key.</li>
    </ul>

    <p>So, if you wish to iterate over the values of a Hashtable, you would
    implement code like the following:</p>
    <code>
    &lt;logic:iterate id="element" name="myhashtable"&gt;<br/>
      Next element is &lt;bean:write name="element" property="value"/&gt;<br/>
    &lt;/logic:iterate&gt;
    </code>

    <p>If the collection you are iterating over can contain <code>null</code>
    values, the loop will still be performed but no page scope attribute
    (named by the <code>id</code> attribute) will be created for that loop
    iteration.  You can use the <code>&lt;logic:present&gt;</code> and
    <code>&lt;logic:notPresent&gt;</code> tags to test for this case.</p>

    ]]>
        </description>
        <attribute>
            <name>collection</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
            <type>java.lang.Object</type>
            <description>
                <![CDATA[
      <p>A runtime expression that evaluates to a collection (conforming to
      the requirements listed above) to be iterated over.</p>
      ]]>
            </description>
        </attribute>
        <attribute>
            <name>id</name>
            <required>true</required>
            <rtexprvalue>false</rtexprvalue>
            <description>
                <![CDATA[
      <p>The name of a page scope JSP bean that will contain the current
      element of the collection on each iteration, if it is not
      <code>null</code>.</p>
      ]]>
            </description>
        </attribute>
        <attribute>
            <name>indexId</name>
            <required>false</required>
            <rtexprvalue>false</rtexprvalue>
            <description>
                <![CDATA[
      <p>The name of a page scope JSP bean that will contain the current
      index of the collection on each iteration.</p>
      ]]>
            </description>
        </attribute>
        <attribute>
            <name>length</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
            <description>
                <![CDATA[
      <p>The maximum number of entries (from the underlying collection) to be
      iterated through on this page.  This can be either an integer that
      directly expresses the desired value, or the name of a JSP bean (in
      any scope) of type <code>java.lang.Integer</code> that defines the
      desired value.  If not present, there will be no limit on the number
      of iterations performed.</p>
      ]]>
            </description>
        </attribute>
        <attribute>
            <name>name</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
            <description>
                <![CDATA[
      <p>The name of the JSP bean containing the collection to be iterated
      (if <code>property</code> is not specified), or the JSP bean whose
      property getter returns the collection to be iterated (if
      <code>property</code> is specified).</p>
      ]]>
            </description>
        </attribute>
        <attribute>
            <name>offset</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
            <description>
                <![CDATA[
      <p>The zero-relative index of the starting point at which entries from
      the underlying collection will be iterated through.  This can be either
      an integer that directly expresses the desired value, or the name of a
      JSP bean (in any scope) of type <code>java.lang.Integer</code> that
      defines the desired value.  If not present, zero is assumed (meaning
      that the collection will be iterated from the beginning.</p>
      ]]>
            </description>
        </attribute>
        <attribute>
            <name>property</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
            <description>
                <![CDATA[
      <p>Name of the property, of the JSP bean specified by <code>name</code>,
      whose getter returns the collection to be iterated.</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>type</name>
            <required>false</required>
            <rtexprvalue>true</rtexprvalue>
            <description>
                <![CDATA[
      <p>Fully qualified Java class name of the element to be exposed through
      the JSP bean named from the <code>id</code> attribute.  If not present,
      no type conversions will be performed.  NOTE:  The actual elements of
      the collection must be assignment-compatible with this class, or a
      request time ClassCastException will occur.</p>
      ]]>
            </description>
        </attribute>
    </tag>
    <tag>
        <name>lessEqual</name>
        <tag-class>org.apache.struts.taglib.logic.LessEqualTag</tag-class>
        <body-content>JSP</body-content>
        <description>
            <![CDATA[
            <p><strong>