Extreme Pattern

源起

之前已經可以將物件利用 spring+hibernet 存放道資料庫，現要整合到一個網頁服務上， 所以需要練習一下 Spring MVC 的架構，並把 MVC 納入 haha.remix.spring 中。

預計將之前的 jpa 練習的 userdao 拿來注到 controller 之中，然後在網頁中簡單列出來。

Spring OSGi Specification (v0.7) 2.5 Web application support

結果

瀏覽器開到 http://127.0.0.1/foo/index.html 可以看到資料庫輸出。

osgi> ss

Framework is launched.

id    State       Bundle
0    ACTIVE      system.bundle_3.3.0.v20061101
5    ACTIVE      javax.servlet_2.4.0.200609281713
6    ACTIVE      javax.servlet.jsp_2.0.0.200610251427
7    ACTIVE      log4j_1.2.13
9    ACTIVE      org.apache.commons.logging_1.0.4
10    ACTIVE      org.eclipse.equinox.ds_1.0.0.v20060828
12    ACTIVE      org.eclipse.equinox.log_1.0.100.v20060717
13    ACTIVE      org.eclipse.osgi.services_3.1.100.v20060918
75    ACTIVE      org.apache.commons.el_1.0.0
76    ACTIVE      org.apache.jasper_5.5.17.200610251427
77    ACTIVE      org.eclipse.equinox.http.jetty_1.0.0.v20061012
78    ACTIVE      org.eclipse.equinox.http.servlet_1.0.0.v20061023
79    ACTIVE      org.eclipse.equinox.jsp.jasper_1.0.0.200610251427
80    ACTIVE      org.eclipse.equinox.jsp.jstl_1.0.0
81    ACTIVE      org.mortbay.jetty_5.1.11.200609281713
85    ACTIVE      haha.hello.jpa.userdao_1.0.0
87    ACTIVE      haha.remix.derby_1.0.0
88    ACTIVE      haha.remix.hibernate_1.0.0
94    ACTIVE      haha.hello.mvc.userdao_1.0.0
95    ACTIVE      haha.remix.spring_1.0.0

haha.hello.mvc.userdao

首先要先找到 HttpService 來用。

META-INF/spring/bean.xml

<osgi:reference id="httpService" interface="org.osgi.service.http.HttpService"/>
<bean name="servletRegister" class="haha.hello.mvc.userdao.ServletRegister" init-method="init">
   <property name="httpService" ref="httpService"/>
</bean>

haha.hello.mvc.userdao.ServletRegister.java

DispatcherServlet servlet = new DispatcherServlet();
servlet.setNamespace("foo-servlet");
OsgiWebApplicationContext owac = new OsgiWebApplicationContext();
servlet.setContextClass(owac.getClass());
httpService.registerServlet("/foo", servlet, null ,null);

WEB-INF/foo-servlet.xml

<osgi:reference id="userDao" interface="haha.hello.jpa.userdao.UserDao"/>
<bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
        <property name="mappings">
            <value>
                /*.html=fooController
            </value>
        </property>
</bean>
<bean id="fooController" 
      class="haha.hello.mvc.userdao.FooController">
     <property name="userDao" ref="userDao"/>
</bean>

haha.hello.mvc.userdao.FooController.java

PrintWriter out = res.getWriter();
Collection users = userDao.loadUsers();
int count = 0;
for (Iterator iter = users.iterator(); iter.hasNext();) {
 User user = (User) iter.next();            
 out.println("Hello, " + user.getName() + "<BR/>");
}

META-INF/MANIFEST.MF

Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: haha.hello.mvc.userdao
Bundle-SymbolicName: haha.hello.mvc.userdao
Bundle-Version: 1.0.0
Bundle-Activator: haha.hello.mvc.userdao.Activator
Bundle-Localization: plugin
Import-Package: haha.hello.jpa.userdao,
 javax.servlet;version="2.4.0",
 javax.servlet.http;version="2.4.0",
 org.osgi.framework;version="1.3.0",
 org.osgi.service.http;version="1.2.0",
 org.springframework.osgi.context.support,
 org.springframework.web.servlet,
 org.springframework.web.servlet.mvc

觀察

1. 註冊的動作之前都是用 OSGi DS 做法注入，這次用 Spring 的 osgi:reference 注入，同時也將 userdao 服務注入 controller 之中練習。
2. OsgiWebApplicationContext 提供支援將 context 注入，不然 osgi:reference 無法使用。