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JavaEE5学习笔记05-EJB之会话Bean(sessionBean)总结-----4

BeanEJBJSPJBossTomcat 
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以上好像还看不出什么，那么咱们开发一个web程序作为测试用例

建立一个web项目，将jboss的client文件夹下面所有的jar包都拷贝进此web项目中。

Index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

    <head></head>

    <body>

       <form name="form1" method="post" action="buy.jsp">

           <label>

              <input type="checkbox" name="items" value="suhuanzhen">

              素还真

           </label>

           <label>

              <input type="checkbox" name="items" value="yexiaochai">

              叶小钗

           </label>

           <label>

              <input type="checkbox" name="items" value="heibailangjun">

              黑白郎君

           </label>

           <br>

           <label>

              <input type="submit" name="Submit" value="提交">

           </label>

       </form>

 

    </body>

</html>

Buy.jsp

<%@ page language="java"

    import="java.util.*,javax.naming.*,ejb.sessionBean.*"

    pageEncoding="utf-8"%>

<%

    ShopService shopService = (ShopService) session

           .getAttribute("ShopService");

 

    if (shopService == null) {

 

       Context context = null;

 

       String init_factory = "org.jnp.interfaces.NamingContextFactory";

       String serverURL = "jnp://127.0.0.1:1099";

 

       Properties properties = new Properties();

       properties.put(Context.INITIAL_CONTEXT_FACTORY, init_factory);

 

       properties.put(Context.URL_PKG_PREFIXES,

              "org.jboss.naming:org.jnp.interfaces");

 

       properties.put(Context.PROVIDER_URL, serverURL);

 

       context = new InitialContext(properties);

 

       shopService = (ShopService) context

              .lookup("ShopServiceEAOImpl/remote");

 

       session.setAttribute("ShopService", shopService);

 

    }

 

    String[] items = request.getParameterValues("items");

 

    for (String itme : items) {

       shopService.addItem(itme);

    }

 

    System.out.println(shopService.showItems());

%>

<a href="index.jsp">[重新选购]</a>

|

<a href="removeBean.jsp">[销毁EJB回话Bean]</a>

removeBean.jsp

<%@ page language="java"

    import="java.util.*,javax.naming.*,ejb.sessionBean.*"

    pageEncoding="utf-8"%>

<%

    ShopService shopService = (ShopService) session

           .getAttribute("ShopService");

 

    if (shopService == null) {

 

       Context context = null;

 

       String init_factory = "org.jnp.interfaces.NamingContextFactory";

       String serverURL = "jnp://127.0.0.1:1099";

 

       Properties properties = new Properties();

       properties.put(Context.INITIAL_CONTEXT_FACTORY, init_factory);

 

       properties.put(Context.URL_PKG_PREFIXES,

              "org.jboss.naming:org.jnp.interfaces");

 

       properties.put(Context.PROVIDER_URL, serverURL);

 

       context = new InitialContext(properties);

 

       shopService = (ShopService) context

              .lookup("ShopServiceEAOImpl/remote");

 

       session.setAttribute("ShopService", shopService);

 

    }

    shopService.removeForClient();

session.removeAttribute("ShopService");

%>

<a href="index.jsp">[重新选购]</a>

Index.jsp是选购人物页面，buy.jsp是调用业务处理逻辑，removeBean是显示的让服务器销毁会话Bean对象。将此项目发布到tomcat中运行，效果如下

 

选中“素还真”提交

客户端控制台如下

 

{suhuanzhen=1}

之后在选择素还真、黑白郎君

控制台如下

 

{suhuanzhen=2, heibailangjun=1}

之后在选择素还真、叶小钗、黑白郎君

控制台如下

 

{suhuanzhen=3, yexiaochai=1, heibailangjun=2}

我们再看看服务端的控制台，以上3个操作造成了控制台信息如下

 

11:54:20,279 INFO  [STDOUT] 有状态SessionBean：ShopServiceEAOImpl构造完毕

11:54:20,791 INFO  [STDOUT] buyInfo:{suhuanzhen=1}

11:55:27,100 INFO  [STDOUT] buyInfo:{suhuanzhen=2, heibailangjun=1}

11:56:07,511 INFO  [STDOUT] buyInfo:{suhuanzhen=3, yexiaochai=1, heibailangjun=2}

之后让另一台计算机或者另一个浏览器——火狐访问你这个tomcat的web应用，重新选择素还真控制台“累计”信息如下

 

{suhuanzhen=1}

{suhuanzhen=2, heibailangjun=1}

{suhuanzhen=3, yexiaochai=1, heibailangjun=2}

{suhuanzhen=1}

之后本机再次重新选择素还真，控制台信息如下

 

{suhuanzhen=1}

{suhuanzhen=2, heibailangjun=1}

{suhuanzhen=3, yexiaochai=1, heibailangjun=2}

{suhuanzhen=1}

{suhuanzhen=4, yexiaochai=1, heibailangjun=2}

由此观之，就像HttpSession一样，有状态的SessionBean各自维护自己客户端的实例的变量状态。不同的客户端，sessionBean的实例变量不会互相干扰，各干各的。当然，如果调用了远程方法，销毁了有状态的会话Bean的时候也要将您httpSession中的会话对象删除掉，这样才能够让远程SessionBean重新创建对象和实例变量啊。

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