java.util.Properties.loadFromXML()方法实例

算法 ww9992019com 发表于 1 周前

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                <p>

<strong>java.util.Properties.loadFromXML(InputStream in)</strong>方法加载所有指定的输入流中到此属性表中的XML文档所表示的所有属性。</p>

<h2>

声明</h2>

<p>

以下是java.util.Properties.loadFromXML()方法的声明</p>

<pre class="prettyprint prettyprinted">

<span class="kwd">public</span><span class="pln"> </span><span class="kwd">void</span><span class="pln"> loadFromXML</span><span class="pun">(</span><span class="typ">InputStream</span><span class="pln"> </span><span class="kwd">in</span><span class="pun">)</span></pre>

<h2>

参数</h2>

<ul>

<li>

    <p>

        in -- 输入流中读取XML文档。</p>

</li>

</ul>

<h2>

返回值</h2>

<p>

此方法不返回任何值。</p>

<h2>

异常</h2>

<ul>

<li>

    <p>

        IOException -- 如果读取指定的输入流导致一个IOException异常。</p>

</li>

<li>

    <p>

        InvalidPropertiesFormatException -- 在输入流中的数据并不构成与要求的文档类型的有效的XML文档。</p>

</li>

<li>

    <p>

        NullPointerException -- 如果 in 为 null.</p>

</li>

</ul>

<h2>

例子</h2>

<p>

下面的示例演示java.util.Properties.loadFromXML()方法的用法。</p>

<pre class="prettyprint prettyprinted">

<span class="kwd">package</span><span class="pln"> com</span><span class="pun">.</span><span class="pln">yiibai</span><span class="pun">;</span><span class="pln">

</span><span class="kwd">import</span><span class="pln"> java</span><span class="pun">.</span><span class="pln">io</span><span class="pun">.</span><span class="typ">FileInputStream</span><span class="pun">;</span><span class="pln">

</span><span class="kwd">import</span><span class="pln"> java</span><span class="pun">.</span><span class="pln">io</span><span class="pun">.</span><span class="typ">FileOutputStream</span><span class="pun">;</span><span class="pln">

</span><span class="kwd">import</span><span class="pln"> java</span><span class="pun">.</span><span class="pln">io</span><span class="pun">.</span><span class="typ">IOException</span><span class="pun">;</span><span class="pln">

</span><span class="kwd">import</span><span class="pln"> java</span><span class="pun">.</span><span class="pln">util</span><span class="pun">.*;</span><span class="pln">

</span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">class</span><span class="pln"> </span><span class="typ">PropertiesDemo</span><span class="pln"> </span><span class="pun">{</span><span class="pln">

</span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">static</span><span class="pln"> </span><span class="kwd">void</span><span class="pln"> main</span><span class="pun">(</span><span class="typ">String</span><span class="pun">[]</span><span class="pln"> args</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln">

  </span><span class="typ">Properties</span><span class="pln"> prop </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">new</span><span class="pln"> </span><span class="typ">Properties</span><span class="pun">();</span><span class="pln">



  </span><span class="com">// add some properties</span><span class="pln">

  prop</span><span class="pun">.</span><span class="pln">put</span><span class="pun">(</span><span class="str">"Height"</span><span class="pun">,</span><span class="pln"> </span><span class="str">"200"</span><span class="pun">);</span><span class="pln">

  prop</span><span class="pun">.</span><span class="pln">put</span><span class="pun">(</span><span class="str">"Width"</span><span class="pun">,</span><span class="pln"> </span><span class="str">"15"</span><span class="pun">);</span><span class="pln">



  </span><span class="kwd">try</span><span class="pln"> </span><span class="pun">{</span><span class="pln">



     </span><span class="com">// create a output and input as a xml file</span><span class="pln">

     </span><span class="typ">FileOutputStream</span><span class="pln"> fos </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">new</span><span class="pln"> </span><span class="typ">FileOutputStream</span><span class="pun">(</span><span class="str">"properties.xml"</span><span class="pun">);</span><span class="pln">

     </span><span class="typ">FileInputStream</span><span class="pln"> fis </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">new</span><span class="pln"> </span><span class="typ">FileInputStream</span><span class="pun">(</span><span class="str">"properties.xml"</span><span class="pun">);</span><span class="pln">



     </span><span class="com">// store the properties in the specific xml</span><span class="pln">

     prop</span><span class="pun">.</span><span class="pln">storeToXML</span><span class="pun">(</span><span class="pln">fos</span><span class="pun">,</span><span class="pln"> </span><span class="kwd">null</span><span class="pun">);</span><span class="pln">



     </span><span class="com">// load from the xml that we saved earlier</span><span class="pln">

     prop</span><span class="pun">.</span><span class="pln">loadFromXML</span><span class="pun">(</span><span class="pln">fis</span><span class="pun">);</span><span class="pln">



     </span><span class="com">// print the properties list</span><span class="pln">

     prop</span><span class="pun">.</span><span class="pln">list</span><span class="pun">(</span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">);</span><span class="pln">



  </span><span class="pun">}</span><span class="pln"> </span><span class="kwd">catch</span><span class="pln"> </span><span class="pun">(</span><span class="typ">IOException</span><span class="pln"> ex</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln">

     ex</span><span class="pun">.</span><span class="pln">printStackTrace</span><span class="pun">();</span><span class="pln">

  </span><span class="pun">}</span><span class="pln">

</span><span class="pun">}</span><span class="pln">

</span><span class="pun">}</span><span class="pln">

</span></pre>

<p>

让我们来编译和运行上面的程序,这将产生以下结果:</p>

<pre class="prettyprint prettyprinted">

<span class="pun">--</span><span class="pln"> listing properties </span><span class="pun">--</span><span class="pln">

</span><span class="typ">Width</span><span class="pun">=</span><span class="lit">15</span><span class="pln">

</span><span class="typ">Height</span><span class="pun">=</span><span class="lit">200</span></pre>

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