?? beans 上的 list, map.htm
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<p>Beans 上的 List, Map</p>
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如果您的Bean上有接受List或Map型態(tài)的屬性，則您也可以在組態(tài)檔案中直接設(shè)定這些屬性的值，一個(gè)例子如下：<div class="code" style="BORDER-TOP-STYLE: solid; BORDER-RIGHT-STYLE: solid; BORDER-LEFT-STYLE: solid; BORDER-BOTTOM-STYLE: solid">
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<pre class="code-java">....
<managed-bean>
<managed-bean-name>someBean</managed-bean-name>
<managed-bean-class>
onlyfun.caterpillar.SomeBean
</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>
<managed-property>
<property-name>someProperty</property-name>
<list-entries>
<value-class>java.lang.<span class="code-object">Integer</span></value-class>
<value>1</value>
<value>2</value>
<value>3</value>
</list-entries>
</managed-property>
</managed-bean>
....</pre>
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<p>
這是一個(gè)設(shè)定接受List型態(tài)的屬性，我們使用<list-entries>卷標(biāo)指定將設(shè)定一個(gè)List對(duì)象，其中<value-class>指定將存入List的型態(tài)，而<value>指定其值，如果是基本型態(tài)，則會(huì)嘗試使用指定的
<value-class>來(lái)作Wrapper類別。</p>
<p> 設(shè)定Map的話，則是使用<map-entries>標(biāo)簽，例如：</p>
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<pre class="code-java">....
<managed-bean>
<managed-bean-name>someBean</managed-bean-name>
<managed-bean-class>
onlyfun.caterpillar.SomeBean
</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>
<managed-property>
<property-name>someProperty</property-name>
<map-entries>
<value-class>java.lang.<span class="code-object">Integer</span></value-class>
<map-entry>
<key>someKey1</key>
<value>100</value>
</map-entry>
<map-entry>
<key>someKey2</key>
<value>200</value>
</map-entry>
</map-entries>
</managed-property>
</managed-bean>
....</pre>
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<p>
由于Map對(duì)象是以key-value對(duì)的方式來(lái)存入，所以我們?cè)诿恳粋€(gè)<map-entry>中使用<key>與<value>標(biāo)簽來(lái)分別指定。</p>
<p> 您也可以直接像設(shè)定Bean一樣，設(shè)定一個(gè)List或Map對(duì)象，例如在JSF附的范例中，有這樣的設(shè)定：</p>
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<pre class="code-java">....
<managed-bean>
<description>
Special expense item types
</description>
<managed-bean-name>specialTypes</managed-bean-name>
<managed-bean-class>
java.util.TreeMap
</managed-bean-class>
<managed-bean-scope>application</managed-bean-scope>
<map-entries>
<value-class>java.lang.<span class="code-object">Integer</span></value-class>
<map-entry>
<key>Presentation Material</key>
<value>100</value>
</map-entry>
<map-entry>
<key>Software</key>
<value>101</value>
</map-entry>
<map-entry>
<key>Balloons</key>
<value>102</value>
</map-entry>
</map-entries>
</managed-bean>
....</pre>
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<p> 而范例中另一個(gè)設(shè)定List的例子如下：</p>
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<div class="codeContent">
<pre class="code-java">....
<managed-bean>
<managed-bean-name>statusStrings</managed-bean-name>
<managed-bean-class>
java.util.ArrayList
</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
<list-entries>
<<span class="code-keyword">null</span>-value/>
<value>Open</value>
<value>Submitted</value>
<value>Accepted</value>
<value>Rejected</value>
</list-entries>
</managed-bean>
....</pre>
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