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JEAP 6 - 建立Web Service

這我之前在電子報有寫過,但是因為不知道丟到哪裡去了,
而且有人問,所以,我還是要再打一次,希望是最後一次了... 哭..

在這裡,先要說清楚,JBoss 本身就有提供Web Service 的功能,JBossws, 可是我看到很多人在寫程式的時候還是會掛Axis 在裡面,有種畫蛇添足的感覺,了解Axis 其實還滿強大的,可以支援許多Protocol, 與建立Bean 的方式,但是大多數的人連用都沒用到。
所以如果你的Web Service 很簡單,乾脆考慮使用JBossws 就夠了。

而且JBossws 都符合Web Service 的JSR. JSR-244, JSR-181, JSR-109, JSR-101.


首先,要先建立一個Project, 選取Web Dynamic Project,

然後取名為hellows,確定後,按下Finished.


開始寫第一個Web Service, 不可免俗的,當然一定要寫個Hello World
(誰來告訴我,為啥一定要是Hello World?) 在左邊選單的hellows上,按下滑鼠右鍵,選擇建立一個Class.


Web Service 其實說穿了也沒啥,所以我們就先簡單的建立一個POJO. 


在上面加上一個Method, 讓Hello World 可以說聲Hello. 


加上Web Service 的Annotation 即可。

發佈上Server, 就可以看到這個Web Service 的相關資訊

到http://localhost:8080/hellows/HelloWorld?wsdl 下,就可以看到這個Web Service 提供的wsdl, 可以將這個提供給其他連結的Client 建置它的處理程式。


以上,Web Service 就完成了。 可是要如何確認這個Web Service 是否可以正常Work?
那就來寫個Client 去連結呼叫就好啦!

首先,我的好習慣就是會幫每個獨立的程式都建立一個Project, 這次就叫做hellowsClient.


接下來的步驟很簡單,如果沒有開發工具,那我可能會哭出來,還好現在的工具都很方便了!

Web Service 的 呼叫方式,基本上有3種,
1. Stub
2. 動態的Proxy (Dynamic Proxy)
3. 動態呼叫介面 (Dynamic Invocation Interface)

其中的1跟2都是需要事先建制,且都可以靠wsdl 完成,而第三樣是比較特別的,他是動態地去抓取Web Service, runtime 才去呼叫,所以事先並不需要wsdl .

這次介紹的是第二種, 動態的Proxy (Dynamic Proxy)

選擇建立Web Service Client.


告訴它wdsl 的位置。


設定好client 的位置。


建立完成後可以看到相對應的class.

這是指定Service 位置的Class,

這是描述Class 內容的物件。

它也會建立一個Sample 檔案。 可以看到這支程式呼叫的方法。
執行程式,


確定它執行與回應都成功!


完成拉!


















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