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我想在本地Glassfish服務器上使用聲明式服務來做一個簡單的OSGi服務。提供的插件始終處於活動狀態。OSGi聲明式服務注入
我與注入我的servlet消耗我的服務的麻煩，當servlet被調用，因爲它不是該得到一個與服務引用注入同一對象的引用爲空。
我通過在我的引用setter中放置一個斷點來測試它，並且我看到我的服務被注入，但是當我點擊將我的servlet調用到我的應用程序中的按鈕時，服務引用爲空，因爲它不相同對象（即servlet_Instance＃1被注入，但調用上servlet_Instance＃2的方法，我一定是缺少一個小細節，因爲我可以找到並使用我的服務做
final BundleContext bundleContext = FrameworkUtil.getBundle(getClass()).getBundleContext();
loggingTestServiceInterface = (LoggingTestServiceInterface) bundleContext.getService(bundleContext
.getServiceReference(LoggingTestServiceInterface.class.getName()));
用來生成我個XML插件時文件：maven-scr-plugin
<plugin>
<groupId>org.apache.felix</groupId>
<artifactId>maven-scr-plugin</artifactId>
<version>1.14.0</version>
<executions>
<execution>
<id>generate-scr-scrdescriptor</id>
<goals>
<goal>scr</goal>
</goals>
</execution>
</executions>
<configuration>
<supportedProjectTypes>
<supportedProjectType>war</supportedProjectType>
<supportedProjectType>jar</supportedProjectType>
<supportedProjectType>bundle</supportedProjectType>
</supportedProjectTypes>
</configuration>
</plugin>
這是我的服務類
@Component(immediate = false, name = "Shikashi", service = {LoggingTestServiceInterface.class}, enabled = true)
public class LoggingTestService implements LoggingTestServiceInterface
{
private final LoggerUtils loggerUtils = new LoggerUtils();
public LoggingTestService()
{
}
@Activate
public void start(final BundleContext bundleContext)
{
System.out.println("StartTest Service Fune");
}
@Deactivate
public void stop()
{
System.out.println("Stop Test Service Jitensha");
}
@Modified
public void modify()
{
System.out.println("Stop Test Service onnanogo");
}
private Logger createLogger(final Class<?> clazz)
{
return Logger.getLogger(clazz);
}
@Override
public void logDebug(final Class<?> clazz, final String message)
{
logDebug(clazz, message, null);
}
@Override
public void logDebug(final Class<?> clazz, final String message, final Throwable throwable)
{
final Logger logger = createLogger(clazz);
logger.debug(message, throwable);
}
}
生成的XML是
<?xml version="1.0" encoding="UTF-8"?>
<components xmlns:scr="http://www.osgi.org/xmlns/scr/v1.1.0">
<scr:component enabled="true" immediate="false" name="Shikashi" activate="start" deactivate="stop" modified="modify">
<implementation class="com.sti.logging.service.LoggingTestService"/>
<service servicefactory="false">
<provide interface="com.sti.loggingservices.serviceinterface.LoggingTestServiceInterface"/>
</service>
</scr:component>
我的servlet是
@WebServlet(name = "Wakarimashita", urlPatterns = { "/Wakarimashita"})
@Component
public class Wakarimashita extends HttpServlet
{
private LoggingTestServiceInterface loggingTestServiceInterface;
@Override
protected void doGet(final HttpServletRequest httpServletRequest, final HttpServletResponse httpServletResponse) throws ServletException, IOException
{
// Method just to setup the Servlet to understand how it works
final String language = "language";
final String path = "/sigbud/language/";
if (httpServletRequest.getParameter(language) != null)
{
if (httpServletRequest.getParameter(language).equalsIgnoreCase("Nihongo"))
{
httpServletResponse.sendRedirect(path + "nihongo.jsp");
}
else if (httpServletRequest.getParameter(language).equalsIgnoreCase("Eigo"))
{
httpServletResponse.sendRedirect(path + "eigo.jsp");
}
else if (httpServletRequest.getParameter(language).equalsIgnoreCase("Funansugo"))
{
httpServletResponse.sendRedirect(path + "funansugo.jsp");
}
else
{
httpServletResponse.sendRedirect(path + "unknown.jsp");
}
}
else
{
super.doGet(httpServletRequest, httpServletResponse);
}
loggingTestServiceInterface.logError(getClass(), "Wakarimasen");
}
@Reference(service = LoggingTestServiceInterface.class, cardinality = ReferenceCardinality.MANDATORY, policy = ReferencePolicy.DYNAMIC)
public void bindLoggingTestServiceInterface(final LoggingTestServiceInterface loggingTestServiceInterface)
{
this.loggingTestServiceInterface = loggingTestServiceInterface;
}
public void unbindLoggingTestServiceInterface(final LoggingTestServiceInterface loggingTestServiceInterface)
{
if (this.loggingTestServiceInterface.equals(loggingTestServiceInterface))
{
this.loggingTestServiceInterface = null;
}
}
@Activate
public void start(final BundleContext bundleContext)
{
System.out.println("StartTest Service Taisho");
}
@Deactivate
public void stop()
{
System.out.println("Stop Test Service Fukutaisho");
}
@Modified
public void modify()
{
System.out.println("Stop Test Service san jyû kyû");
}
}
生成的XML
<?xml version="1.0" encoding="UTF-8"?>
<components xmlns:scr="http://www.osgi.org/xmlns/scr/v1.1.0">
<scr:component name="com.sti.sigbud.servlet.Wakarimashita" activate="start" deactivate="stop" modified="modify">
<implementation class="com.sti.sigbud.servlet.Wakarimashita"/>
<reference name="LoggingTestServiceInterface" interface="com.sti.loggingservices.serviceinterface.LoggingTestServiceInterface" cardinality="1..1" policy="dynamic" bind="bindLoggingTestServiceInterface" unbind="unbindLoggingTestServiceInterface"/>
</scr:component>
而且我試過，但沒有運氣，因爲我的servlet似乎並沒有找到（錯誤404 - 所請求的資源（）不可用。），來做爲彼得柯瑞恩斯寫有：How to consume OSGi service from OSGi HTTP Service
所以我修改我的servlet像這樣：
@Component(service = Servlet.class, property = {"alias=/Wakarimashita"})
public class Wakarimashita extends HttpServlet
生成的XML是
<?xml version="1.0" encoding="UTF-8"?>
<components xmlns:scr="http://www.osgi.org/xmlns/scr/v1.1.0">
<scr:component name="com.sti.sigbud.servlet.Wakarimashita" activate="start" deactivate="stop" modified="modify">
<implementation class="com.sti.sigbud.servlet.Wakarimashita"/>
<service servicefactory="false">
<provide interface="javax.servlet.Servlet"/>
</service>
<property name="alias" value="/Wakarimashita"/>
<reference name="LoggingTestServiceInterface" interface="com.sti.loggingservices.serviceinterface.LoggingTestServiceInterface" cardinality="1..1" policy="dynamic" bind="bindLoggingTestServiceInterface" unbind="unbindLoggingTestServiceInterface"/>
</scr:component>
我從JSP
<form action="Wakarimashita" method="GET">
<input type="text" name="language" size="50"/>
<input type="submit" value="Submit" />
</form>
訪問servlet爲了測試上面我在我的部署捆綁org.apache.felix.http.api-2.2.1，org.apache.felix.http。白板-2.2.1就像在帖子中一樣。沒有找到是否有轉換。
另外我用org.apache.felix.webconsole-4.2.0檢查了所有的軟件包，並且服務在那裏運行，它說我的使用者軟件包正在使用它。
Wakarimasen deshita ... –