Petstore源码追踪记

Petstore_home(注一)/src/apps/petstore/src/docroot/WEB-INF/web.xml，
我们可以看到：
<!-- Encoding Filter Declaration Start -->
<filter>  //1.第一个Fliter
    <filter-name>EncodingFilter</filter-name>
    <display-name>EncodingFilter</display-name>
    <description>no description</description>
    <filter-class>com.sun.j2ee.blueprints.encodingfilter.web.EncodingFilter
</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
</filter>
<!-- Encoding Filter Declaration End -->
<!-- Signon Filter Declaration Start -->
<filter>  //2.第二个Filter
    <filter-name>SignOnFilter</filter-name>
    <display-name>SignOnFilter</display-name>
    <description>no description</description>
    <filter-class>com.sun.j2ee.blueprints.signon.web.SignOnFilter</filter-class>
</filter>
<!-- Signon Filter Declaration End -->

<!-- Encoding Filter Mapping Start-->
<filter-mapping> //第一个Filter对应
    <filter-name>EncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>
<!-- Encoding Filter Mapping End -->
<!-- Signon Filter Mapping Start-->
<filter-mapping> //第二个Filter对应
    <filter-name>SignOnFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>
<!-- Signon Filter Mapping End -->

<!-- ComponentManager Listener -->
<listener> //3.第一个Listerner

<listener-class>com.sun.j2ee.blueprints.petstore.controller.web.PetstoreComponentManager</listener-class>
</listener>

<!-- SignOn Attribute Listener -->
<listener> //4.第二个Listerner

<listener-class>com.sun.j2ee.blueprints.petstore.controller.web.SignOnNotifier</listener-class>
</listener>

<!-- Encoding Filter Declaration Start -->
  <filter>
    <filter-name>EncodingFilter</filter-name>
    <display-name>EncodingFilter</display-name>
    <description>no description</description>
    <filter-class>com.sun.j2ee.blueprints.encodingfilter.web.EncodingFilter
</filter-class>
    <init-param> //设定编码方式参数
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
  </filter>

EncodingFilter.java
public class EncodingFilter implements Filter {

    private FilterConfig config = null;
    // default to ASCII
    private String targetEncoding = "ASCII";

    //初始化时读取参数
    public void init(FilterConfig config) throws ServletException {
        this.config = config;
        this.targetEncoding = config.getInitParameter("encoding");
    }

    public void destroy() {
        config = null;
        targetEncoding = null;
    }
     //将编码方式参数存入reqeust，结束此Filter
     public void doFilter(ServletRequest srequest, ServletResponse  sresponse,
　　　　FilterChain chain)
        throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest)srequest;
        request.setCharacterEncoding(targetEncoding);
        // move on to the next
       chain.doFilter(srequest,sresponse);
    }
}

Petstore_home/src/waf/src/controller/com/sun/j2ee/blueprints/waf/controller/web

public void sessionCreated(HttpSessionEvent se) {
     HttpSession session = se.getSession();
     //产生服务连结容器
     sl = ServiceLocator.getInstance();
     //将本Listener存入Session
     session.setAttribute(WebKeys.COMPONENT_MANAGER, this);
}

public class ServiceLocator {

    private InitialContext ic;
    private Map cache; //used to hold references to EJBHomes/JMS Resources for
　　　　　　　　　　//re-use

    private static ServiceLocator me;
    //初次宣告此对象时会执行初始化动作
    static {
      try {
        me = new ServiceLocator();
      } catch(ServiceLocatorException se) {
        System.err.println(se);
        se.printStackTrace(System.err);
      }
    }
    //建构子，产生JNDI连结及同步化HashMap容器
    private ServiceLocator() throws ServiceLocatorException  {
      try {
        ic = new InitialContext();
        cache = Collections.synchronizedMap(new HashMap());
      } catch (NamingException ne) {
            throw new ServiceLocatorException(ne);
      } catch (Exception e) {
            throw new ServiceLocatorException(e);
       }
    }

    //将本对象参考传出
    static public ServiceLocator getInstance() {
      return me;
    }

以下略过…
}