Flex + Hessian + Spring

這是我第一偏的文章
我是初學 FLEX
如同標題所示我一直在找 FLEX 與 JAVA 溝通的管道
Hessian 我選擇了他，簡單易用且支持很多 client 當然最近也支持了 FLEX
要怎麼上手呢看了 Hessian 網站上的範例 hessian.caucho.com/doc/flash.xtp
有了一點基礎但是要實做一個 HessianServlet 總覺得不是很好用
想說我用 spring 用習慣了來看看有沒有解決的方法想到 spring 的文檔 Remoting and web services using Spring
static.springframework.org/spring/docs/2.5.x/reference/remoting.html
剛好有對 hessian 支持
所以馬上來試用 首先當然是設定一些文檔好讓 spring remoting 能夠活起來

web.xml 代码

<
servlet
>
    <
servlet-name
>
remoting
</
servlet-name
>
    <
servlet-class
>
org.springframework.web.servlet.DispatcherServlet
</
servlet-class
>
    <
load-on-startup
>
1
</
load-on-startup
>
</
servlet
>

<
servlet-mapping
>
    <
servlet-name
>
remoting
</
servlet-name
>
    <
url-pattern
>
/remoting/*
</
url-pattern
>
</
servlet-mapping
>

上面的設置是必須的啦通過 servlet 的代理可直接呼叫你的 service
記住 servlet-name 與你下面檔案命名有關當然你也可以自己設定你喜歡對應的文檔名
我喜歡用 default 的值所以我的 servlet-name 為 remoting, spring 到時會去抓取
WEB-INF/remoting-servlet.xml 讀取你設定的 bean

xml 代码

<
bean
 
id
=
"accountService"
 
class
=
"example.AccountServiceImpl"
>
  <
property
 
name
=
"accountDao"
 
ref
=
"accountDao"
/>
</
bean
>

<
bean
 
name
=
"/AccountService"
 
class
=
"org.springframework.remoting.caucho.HessianServiceExporter"
>
  <
property
 
name
=
"service"
 
ref
=
"accountService"
/>
  <
property
 
name
=
"serviceInterface"
 
value
=
"example.AccountService"
/>
</
bean
>

上面的 /AccountService 就是映射你要訪問的 url 當然你的 url 不是只 /AccountService 還要加上你 servlet-mapping 的 url-pattern /remoting/*
所以對應的 url 就是 /remoting/AccountService 這就是我們 flex 端要連上的位址
當然你也可以簡化你的 url-pattern 為 /* ,那 URL 就是只對應到 /AccountService
至於 flex 端要怎麼連上來呢 ？

xml 代码

<
mx:Application
  xmlns:mx
=
"http://www.adobe.com/2006/mxml"
 
xmlns:word
=
"*"
  implements
=
"mx.rpc.IResponder"
>

  <
mx:Script
>
    <
[CDATA[
      import hessian.client.HessianService;

      import mx.rpc.AsyncToken;
      import mx.rpc.events.ResultEvent;

      private var service:HessianService
 = 
new
 HessianService("remoting/AccountService");

      private function getAccount():void
      {
        var token:AsyncToken
 = 
service
.getAccount.send(va.text);
        token.addResponder(this);
      }

      public function result(data:Object):void
      {
         var event : ResultEvent
 = 
data
 as ResultEvent;
         uplogDataGrid.dataProvider
 = 
event
.result as Array;
      }

      public function fault(info:Object):void
      {

      }
    ]]>
  </
mx:Script
>
  <
mx:TextInput
 
x
=
"100"
 
y
=
"90"
 
id
=
"va"
 
text
=
""
/>
  <
mx:Button
 
x
=
"260"
 
y
=
"90"
 
label
=
"Button"
 
click
=
"getAccount()"
 
/>
  <
mx:DataGrid
 
id
=
"aDataGrid"
 
x
=
"10"
 
y
=
"120"
 
width
=
"99%"
 
/>
</
mx:Application
>

其實很簡單只要使用 HessianService 去作遠程呼叫即可
先創造一個 HessianService 實例此實例當然要指向你要呼叫的遠端 sevice 的 url new  HessianService("remoting/AccountService"); 
然後用其 getOperation("getAccount").send();
以上面為例為 service.getOperation("getAccount").send(va.text);
也可以寫成
service.getAccount.send(va.text);
getAccount 當然是你要呼叫遠端 AccountService 的 getAccount( String name );

以下是一些 java

Account.java 代码

public
 
class
 Account 
implements
 Serializable{
  private
 String name;

  public
 String getName();

  public
 
void
 setName(String name) {
    this
.name = name;
  }
}

AccountService. java 代码

public
 
interface
 AccountService {

  public
 
void
 insertAccount(Account account);

  public
 List getAccounts(String name);
}

AccountServiceImpl. java 代码

public
 
class
 AccountServiceImpl 
implements
 AccountService {

  private
 AccountDao accountDao;

  private
 
void
 setAccountDao(AccountDao) {
      this
.accountDao = accountDao;
  }

  public
 
void
 insertAccount(Account acc) {
    // do something...
  }

  public
 List getAccounts(String name) {
      return accountDao.getAccounts(name);
  }
}

java 代码

// the implementation doing nothing at the moment
public
 
class
 AccountDaoImpl 
implements
 AccountDao{

  public
 
void
 insertAccount(Account acc) {
    // do something...
  }

  public
 List getAccounts(String name) {
    List list = new
 ArrayList();
    Account a = new
 Account();
    a.setName(name);
    list.add(a);
    return
 list;
  }
}

评论

1 楼 nathanlee 2009-08-03  

请问 你用的hessian-XXXX.jar和hessian-flex-XXXX.swc分别是什么版本的？
还有Spring.jar是什么版本?