[OSGi] OSGi + Spring + Web Demo [2]

1. 同样方法创建 helloworldweb Bundle，用 Maven方式创建并转为 PDE Tools。

2. 引入 Spring OSGi 1.2.1

下载 Spring OSGi 1.2.1，将其中 dist和 lib中的 jar包都 copy到 eclipse的 plugins目录中。重启 eclipse。

3. HelloWorldController.java

public class HelloWorldController extends MultiActionController {

private TimeService timeService ;

 

public ModelAndView echoTime(HttpServletRequest request,

HttpServletResponse response) throws Exception {

System. out .println( "echoTime" );

ModelAndView mv = new ModelAndView( "result" );

mv.addObject( "result" , timeService .getCurrentTime());

return mv;

}

 

public TimeService getTimeService() {

System. out .println( "getTimeService" );

return timeService ;

}

 

public void setTimeService(TimeService timeService) {

System. out .println( "setTimeService" );

this . timeService = timeService;

}

}

4. MANIFEST.MF。个人理解， import-package是代码编译中需要用到的 class的 package，包括 import的 class、及其父类、成员变量的类等。在运行时，需要勾选相应 package的 Bundle。

Import-Package : javax.servlet.http; version ="2.5.0",

javax.servlet.jsp.jstl.core; version ="1.1.2",

org.apache.jasper.servlet; version ="5.5.17",

org.apache.taglibs.standard.tag.common.fmt; version ="1.1.2",

org.osgichina.demo.timeservice,

org.springframework.beans; version ="2.5.6.SEC01",

org.springframework.context.support; version ="2.5.6.SEC01",

org.springframework.core; version ="2.5.6.SEC01",

org.springframework.osgi.web.context.support; version ="1.2.1",

org.springframework.web.context; version ="2.5.6.SEC01",

org.springframework.web.context.support; version ="2.5.6.SEC01",

org.springframework.web.servlet; version ="2.5.6.SEC01",

org.springframework.web.servlet.handler; version ="2.5.6.SEC01",

org.springframework.web.servlet.mvc; version ="2.5.6.SEC01",

org.springframework.web.servlet.mvc.multiaction; version ="2.5.6.SEC01",

org.springframework.web.servlet.mvc.support; version ="2.5.6.SEC01",

org.springframework.web.servlet.view; version ="2.5.6.SEC01"

 

 

5. 引入 timeservice Bundle中的 service， WEB-INF/applicationContext.xml。引入的 OSGi service，注入方式和普通 service是一样的，见 WEB-INF/spring-servlet.xml。

<? xml version = "1.0" encoding = "UTF-8" ?>

< beans xmlns = "http://www.springframework.org/schema/beans"

xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" xmlns:osgi = "http://www.springframework.org/schema/osgi"

xsi:schemaLocation = "http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd

http://www.springframework.org/schema/osgi http://www.springframework.org/schema/osgi/spring-osgi.xsd" >

<!-- 引入 OSGi Service -->

< osgi:reference id = "osgiTimeService" interface = "org.osgichina.demo.timeservice.TimeService" />

</ beans >

 

6. 定义 web.xml，配置 OSGi Web，配置 Spring Framework

<? xml version = "1.0" encoding = "UTF-8" ?>

< web-app version = "2.4" xmlns = " http://java.sun.com/xml/ns/j2ee "

xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation = "http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" >

< context-param >

< param-name > contextClass </ param-name >

< param-value >

org.springframework.osgi.web.context.support.OsgiBundleXmlWebApplicationContext

</ param-value >

</ context-param >

< listener >

< listener-class > org.springframework.web.context.ContextLoaderListener </ listener-class >

</ listener >

< servlet >

< servlet-name > spring </ servlet-name >

< servlet-class > org.springframework.web.servlet.DispatcherServlet </ servlet-class >

< init-param >

< param-name > contextClass </ param-name >

< param-value >

org.springframework.osgi.web.context.support.OsgiBundleXmlWebApplicationContext

</ param-value >

</ init-param >

< load-on-startup > 2 </ load-on-startup >

</ servlet >

< servlet-mapping >

< servlet-name > spring </ servlet-name >

< url-pattern > /spring/* </ url-pattern >

</ servlet-mapping >

</ web-app >

 

7. WEB-INF/spring-servlet.xml。配置 url mapping ， service注入。可特别注意下， timeService的注入和普通 service的注入是一样的。

<? xml version = "1.0" encoding = "UTF-8" ?>

< beans xmlns = "http://www.springframework.org/schema/beans"

xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation = "http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans.xsd" >

<!-- page config -->

< bean id = "viewResolver"

class = "org.springframework.web.servlet.view.UrlBasedViewResolver" >

< property name = "viewClass"

value = "org.springframework.web.servlet.view.JstlView" />

< property name = "prefix" value = "/" />

< property name = "suffix" value = ".jsp" />

</ bean >

<!-- controller general config -->

< bean

class = "org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping" >

< property name = "caseSensitive" value = "true" />

< property name = "order" value = "0" />

< property name = "pathPrefix" value = "/" />

</ bean >

<!-- controller general config -->

< bean id = "internalPathMethodNameResolver"

class = "org.springframework.web.servlet.mvc.multiaction.InternalPathMethodNameResolver" />

 

<!-- action to url mapping -->

< bean id = "urlMapping"

class = "org.springframework.web.servlet.handler.SimpleUrlHandlerMapping" >

< property name = "mappings" >

< props >

< prop key = "/helloWorld/*" > helloWorldController </ prop >

</ props >

</ property >

</ bean >

<!-- Bean Definition -->

< bean id = "helloWorldController" class = "org.osgichina.demo.web.HelloWorldController" >

< property name = "methodNameResolver" >

< ref bean = "internalPathMethodNameResolver" />

</ property >

< property name = "timeService" ref = "osgiTimeService" />

</ bean >

</ beans >

 

8. 启动 Demo

Run Configurations -> OSGi Framework 。

勾选 timeservice和 helloworldweb，引入相关的 Bundle，示意图如下，

点 Validate Bundle，可以看到还缺少哪些包。个人理解，这里应该包含 import package中的 Bundle和运行时调用的 Bundle 。

启动后，可以看到 Console中的输出日志。访问以下 Url查看效果，

http://127.0.0.1:8080/helloworldweb/spring/helloWorld/echoTime

http://127.0.0.1:8080/helloworldweb/