springdm:基于Spring DM的WEB应用开发

Spring DM 1.1.x最大特性便是它可以支持在其中部署WEB应用我使用后感觉这是个很酷特性我甚至觉得用这种方式开发基于OSGi WEB应用比使用Spring DM Server更好至少目前你可以获得更好便携性(可以在多个Spring DM支持OSGi平台上运行)并且Spring DM Server并没有提供更多企业应用支持

不过对于刚使用Spring DM进行WEB应用开发人来说成功地配置却不是件容易事以下详细讲解下相关配置

1 运行环境所需Bundles:

0 ACTIVE system.bundle_3.2.2.R32x_v20070118

1 ACTIVE com.springsource.slf4j.api_1.5.0

2 RESOLVED org.springframework.osgi.jetty.web.extender.fragment.osgi_1.0.0

Master=46

3 ACTIVE org.springframework.bundle.osgi.extender_1.0.1.v200803070100

4 ACTIVE org.springframework.bundle.spring.core_2.5.5

5 ACTIVE org.springframework.bundle.spring.web_2.5.5

6 ACTIVE com.springsource.org.objectweb.asm_2.2.3

7 RESOLVED osgi_log_config_1.0.0

Master=36

8 ACTIVE org.springframework.bundle.osgi.core_1.0.1.v200803070100

9 ACTIVE com.springsource.slf4j.log4j_1.5.0

10 ACTIVE org.springframework.bundle.spring_2.5.2.v200803070100

11 ACTIVE org.springframework.bundle.spring.context_2.5.5

12 ACTIVE javax.servlet_2.4.0.v200706111738

13 ACTIVE org.springframework.osgi.servlet-api.osgi_2.5.0.SNAPSHOT

14 ACTIVE com.springsource.net.sf.cglib_2.1.3

15 ACTIVE org.springframework.bundle.spring.beans_2.5.5

16 ACTIVE javax.servlet.jsp_2.0.0.v200706191603

18 ACTIVE org.springframework.osgi.jetty.start.osgi_1.0.0

19 ACTIVE org.springframework.bundle.osgi.io_1.0.1.v200803070100

20 ACTIVE org.aopalliance_1.0.0

21 ACTIVE org.springframework.bundle.spring.context.support_2.5.5

23 ACTIVE com.springsource.org.aopalliance_1.0.0

24 ACTIVE org.springframework.bundle.spring.aop_2.5.5

25 ACTIVE com.springsource.slf4j.org.apache.commons.logging_1.5.0

30 ACTIVE org.objectweb.asm_2.2.3

33 ACTIVE org.mortbay.jetty.server_6.1.9

35 ACTIVE org.mortbay.jetty.util_6.1.9

36 ACTIVE org.springframework.osgi.log4j.osgi_1.2.15.SNAPSHOT

Fragments=7

37 ACTIVE org.mortbay.jetty_5.1.11.v200706111724

43 ACTIVE org.springframework.bundle.osgi.extender_1.1.2

44 ACTIVE org.springframework.bundle.osgi.io_1.1.2

45 ACTIVE org.springframework.bundle.osgi.web_1.1.2

46 ACTIVE org.springframework.bundle.osgi.web.extender_1.1.2

Fragments=2

47 ACTIVE org.springframework.bundle.osgi.core_1.1.2

以上这些Bundles可以在spring dm 1.1.2发布包中找到以上Bundlesstart level设置为2

2 加入Log4j日志配置Bundles

这个Bundles目在于提供log4j.properties,详细做法可以参考本人”spring osgi快速入门”

3 开发WEB应用

WEB应用开发方式和普通WEB基本上样只是加入些OSGi配置

大致结构如下:

META-INF

MANIFEST.MF

WEB-INF

Classes

Lib

Web.xml

applicationContext.xml

1 MANIFEST.MF配置参考:

Manest-Version: 1.0

Bundle-ManestVersion: 2

Bundle-Name: Osgi_web_app Plug-in

Bundle-SymbolicName: osgi_web_app

Bundle-Version: 1.0.0

Bundle-Vendor: ccsoft

Import-Package: javax.servlet,

javax.servlet.http,

javax.servlet.resources;version="2.4.0",

org.ccsoft.service,

org.springframework.osgi.web.context.support;version="1.1.2",

org.springframework.web.context,

org.springframework.web.context.support

Bundle-ClassPath: WEB-INF/es/,

.

Require-Bundle: org.springframework.bundle.osgi.core,

org.springframework.bundle.osgi.io,

org.springframework.bundle.spring.beans,

org.springframework.bundle.spring.context,

org.springframework.bundle.spring.core



2 为了在web应用中使用spring dmIoC功能web.xml中需要加入些特定配置类似于使用Spring时配置web.xml配置参考如下:

<?xml version="1.0" encoding="ISO-8859-1"?>

<web-app 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"

version="2.4">



<display-name>Simple Osgi WebApp Bundle</display-name>

<description>Simple OSGi War</description>

<context-param>

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

<param-value>org.springframework.osgi.web.context.support.OsgiBundleXmlWebApplicationContext</param-value>



</context-param>



<listener>

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

</listener>





<servlet>

<servlet-name>MyServlet</servlet-name>

<servlet->org.ccsoft.web.MyServlet</servlet->

</servlet>







<servlet-mapping>

<servlet-name>MyServlet</servlet-name>

<url-pattern>/servlet</url-pattern>

</servlet-mapping>







</web-app>



至于applicationContext.xml则是标准spring dm配置文件形式只是没有放在我们所熟悉位置(META-INF/spring)

配置举例:

<?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">



<osgi:reference id="HelloServiceOsgi" erface="org.ccsoft.service.SpeakService"/>

</beans>

在你WEB应用中可以使用如下代码来访问别Bundle提供服务:

WebApplicationContext ctx = WebApplicationContextUtils.getWebApplicationContext(req.getSession.getServletContext);

SpeakService ss=(SpeakService)ctx.getBean("HelloServiceOsgi");

和你使用Spring开发WEB应用写法是完全致

好了现在你可以利用spring dm开发你web应用了更多相关问题还会在后续文章中逐讨论

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