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| <p><a name="BlueprintWeb"></a></p> |
| <h1 id="blueprintweb">BlueprintWeb<a class="headerlink" href="#blueprintweb" title="Permanent link">¶</a></h1> |
| <p>The Blueprint Web module makes it easy to use OSGi Blueprint as a dependency injection framework outside of OSGi containers such as inside any Servlet Engine. </p> |
| <p>You can then use Blueprint as a small standards base alternative to the Spring Framework's XML dependency injection files.</p> |
| <p><a name="BlueprintWeb-HowToUse"></a></p> |
| <h2 id="how-to-use-blueprint-web">How to use Blueprint Web<a class="headerlink" href="#how-to-use-blueprint-web" title="Permanent link">¶</a></h2> |
| <p>Just add the following to your web.xml</p> |
| <div class="codehilite"><pre> <span class="nt"><listener></span> |
| <span class="nt"><listener-class></span>org.apache.aries.blueprint.web.BlueprintContextListener<span class="nt"></listener-class></span> |
| <span class="nt"></listener></span> |
| </pre></div> |
| |
| |
| <p>This will then make your web application look in the classpath for all files called <strong>META-INF/blueprint.xml</strong>. Each one will then be loaded and created in a single BlueprintContainer for your web application.</p> |
| <p>Then in each jar or in the web application itself, just create a file called <strong>src/main/resources/META-INF/blueprint.xml</strong> which will then get included into jars or into your WAR.</p> |
| <p>If you wish to use a different name for the location of the blueprint files you can specify the <strong>blueprintLocation</strong> property as a context parameter as follows:</p> |
| <div class="codehilite"><pre> <span class="nt"><context-param></span> |
| <span class="nt"><param-name></span>blueprintLocation<span class="nt"></param-name></span> |
| <span class="nt"><param-value></span>META-INF/myName.xml<span class="nt"></param-value></span> |
| <span class="nt"></context-param></span> |
| </pre></div> |
| |
| |
| <p><a name="BlueprintWeb-Configuraiton"></a> </p> |
| <h2 id="configuring-blueprint-through-properties">Configuring blueprint through properties<a class="headerlink" href="#configuring-blueprint-through-properties" title="Permanent link">¶</a></h2> |
| <p>Blueprint beans can be configured using the variable substitutions. |
| You need to declare the ext namespace and add the property placeholder bean in your blueprint xml</p> |
| <div class="codehilite"><pre><span class="nt"><blueprint</span> <span class="na">xmlns=</span><span class="s">"http://www.osgi.org/xmlns/blueprint/v1.0.0"</span> |
| <span class="na">xmlns:ext=</span><span class="s">"http://aries.apache.org/blueprint/xmlns/blueprint-ext/v1.2.0"</span><span class="nt">></span> |
| <span class="nt"><ext:property</span><span class="err">-placeholder</span><span class="nt">></span> |
| <span class="nt"><ext:default</span><span class="err">-properties</span><span class="nt">></span> |
| <span class="nt"><ext:property</span> <span class="na">name=</span><span class="s">"myProperty"</span> <span class="na">value=</span><span class="s">"defaultValue"</span> <span class="nt">/></span> |
| <span class="nt"></ext:default-properties></span> |
| <span class="nt"></ext:property-placeholder></span> |
| ... |
| <span class="nt"><bean</span> <span class="err">...</span><span class="nt">></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"myProperty"</span> <span class="na">value=</span><span class="s">"</span><span class="cp">${</span><span class="n">myProperty</span><span class="cp">}</span><span class="s">"</span> <span class="nt">/></span> |
| <span class="nt"></bean></span> |
| <span class="nt"></blueprint></span> |
| </pre></div> |
| |
| |
| <p>The default value can be overriden by specifying an the blueprintProperties property as a context parameter in the web.xml:</p> |
| <div class="codehilite"><pre><span class="nt"><context-param></span> |
| <span class="nt"><param-name></span>blueprintProperties<span class="nt"></param-name></span> |
| <span class="nt"><param-value></span>myConfigFile.properties<span class="nt"></param-value></span> |
| <span class="nt"></context-param></span> |
| </pre></div> |
| |
| |
| <p>The value of this parameter is a comma separated list of properties file loaded from the class loader. |
| In this case, adding a file called <strong>src/main/resources/myConfigFile.properties</strong> will do the trick.</p></div> |
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