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| |
| <article class="container"> |
| <section class="col-md-12"> |
| <a class="edit-on-gh" href="https://github.com/apache/struts-site/edit/master/source/tag-developers/bean-tag.md" title="Edit this page on GitHub">Edit on GitHub</a> |
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| <a href="tag-reference.html" title="back to Tag Reference"><< back to Tag Reference</a> |
| |
| <h1 id="bean">bean</h1> |
| |
| <p>Please make sure you have read the <a href="tag-syntax">Tag Syntax</a> document and understand how tag attribute syntax works.</p> |
| |
| <h2 id="description">Description</h2> |
| |
| <p>Instantiates a class that conforms to the JavaBeans specification. This tag has a body which can contain a number |
| of <a href="param-tag">param</a> elements to set any mutator methods on that class.</p> |
| |
| <p>If the var attribute is set on the BeanTag, it will place the instantiated bean into the stack’s Context.</p> |
| |
| <p>Instantiate a JavaBean and place it in the context</p> |
| |
| <h2 id="attributes">Attributes</h2> |
| |
| <table width="100%"> |
| <tr> |
| <td colspan="6"><h4>Dynamic Attributes Allowed:</h4> false</td> |
| </tr> |
| <tr> |
| <td colspan="6"> </td> |
| </tr> |
| <tr> |
| <th align="left" valign="top"><h4>Name</h4></th> |
| <th align="left" valign="top"><h4>Required</h4></th> |
| <th align="left" valign="top"><h4>Default</h4></th> |
| <th align="left" valign="top"><h4>Evaluated</h4></th> |
| <th align="left" valign="top"><h4>Type</h4></th> |
| <th align="left" valign="top"><h4>Description</h4></th> |
| </tr> |
| <tr> |
| <td align="left" valign="top">name</td> |
| <td align="left" valign="top"><strong>true</strong></td> |
| <td align="left" valign="top"></td> |
| <td align="left" valign="top">false</td> |
| <td align="left" valign="top">String</td> |
| <td align="left" valign="top">The class name of the bean to be instantiated (must respect JavaBean specification)</td> |
| </tr> |
| <tr> |
| <td align="left" valign="top">var</td> |
| <td align="left" valign="top">false</td> |
| <td align="left" valign="top"></td> |
| <td align="left" valign="top">false</td> |
| <td align="left" valign="top">String</td> |
| <td align="left" valign="top">Name used to reference the value pushed into the Value Stack (scope: action).</td> |
| </tr> |
| </table> |
| |
| <h2 id="examples">Examples</h2> |
| |
| <h3 id="in-freemarker-form">in freemarker form</h3> |
| |
| <div class="highlighter-rouge"><div class="highlight"><pre class="highlight"><code> [@s.bean name="org.apache.struts2.example.counter.SimpleCounter" var="counter"] |
| [s:param name="foo" value="BAR"/] |
| The value of foo is : [s:property value="foo"/], when inside the bean tag. |
| [/s:bean] |
| </code></pre></div></div> |
| |
| <h3 id="in-jsp-form">in jsp form</h3> |
| |
| <pre><code class="language-jsp"> <s:bean name="org.apache.struts2.example.counter.SimpleCounter" var="counter"> |
| <s:param name="foo" value="BAR" /> |
| The value of foot is : <s:property value="foo"/>, when inside the bean tag <br /> |
| </s:bean> |
| |
| </code></pre> |
| |
| <p>This example instantiates a bean called SimpleCounter and sets the foo property (<code class="highlighter-rouge">setFoo('BAR')</code>). The <code class="highlighter-rouge">SimpleCounter</code> |
| object is then pushed onto the <code class="highlighter-rouge">ValueStack</code>, which means that we can call its accessor methods (<code class="highlighter-rouge">getFoo()</code>) with |
| the property tag and get their values.</p> |
| |
| <p>In the above example, the id has been set to a value of <code class="highlighter-rouge">counter</code>. This means that the <code class="highlighter-rouge">SimpleCounter</code> class |
| will be placed into the stack’s context. You can access the <code class="highlighter-rouge">SimpleCounter</code> class using a Struts tag:</p> |
| |
| <h3 id="jsp-form">jsp form</h3> |
| |
| <pre><code class="language-jsp"> <s:property value="#counter" /> |
| </code></pre> |
| |
| <h3 id="freemarker-form">freemarker form</h3> |
| |
| <div class="highlighter-rouge"><div class="highlight"><pre class="highlight"><code> [s:property value="#counter.foo"/] |
| </code></pre></div></div> |
| |
| <p>In the property tag example, the <i>#</i> tells Ognl to search the context for the SimpleCounter class which has |
| an <code class="highlighter-rouge">id(key)</code> of <code class="highlighter-rouge">counter</code>.</p> |
| |
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