Flex通信-Java服務端通信實例

本文轉自：http://blessht.iteye.com/blog/1132934

Flex與Java通信的方式有很多種，比較常用的有以下方式：

WebService：一種跨語言的在線服務，只要用特定語言寫好並部署到服務器，其它語言就可以調用

HttpService：通過http請求的形式訪問服務器

RmoteObject：通過AMF協議，以二進制的形式交互數據

Socket：套接字協議，服務器和客戶端以IO的形式交互數據

上面幾種各有個的優勢：WebService常用於跨語言調用，不過解析協議需要花不少時間，運行速度不快；HttpService類似於Ajax；通常RmoteObject是最受歡迎的，因爲它的運行效率快，數據解析方便。Socket編碼稍微麻煩點，這裏有一個Socket通信的例子，大家可以學習一下：http://blog.csdn.net/as_leon/article/details/5351713

今天針對WebService、HttpService和RmoteObject三種通信分別做一個例子，供大家學習參考。

在Flex頁面上新建三個文本框和按鈕，在文本框中輸入內容再點擊不同按鈕調用不同通信方式，最後將Java返回的數據顯示在界面上。首先看下運行效果：

WebService通信

【Java端代碼】

JDK提供了比較全面的webservice支持，爲了簡化開發步驟，我使用了Apache CXF框架實現WebService的開發部署。CXF的使用可以參照這裏：http://blessht.iteye.com/blog/1105562

首先創建一個接口：

Java代碼

package webservice;
import javax.jws.WebService;
@WebService
public interface HelloWebservice {
public String getWebservice(String name);
}

package webservice;

import javax.jws.WebService;

@WebService
public interface HelloWebservice {
	public String getWebservice(String name);
}

然後創建該接口的實現類：

Java代碼

package webservice;
import javax.jws.WebService;
@WebService(endpointInterface="webservice.HelloWebservice",serviceName="hellows",portName="hellowsport")
public class HelloWebserviceImpl implements HelloWebservice{
public String getWebservice(String name) {
return "你好["+name+"]這是來自webservice的信息..."+this;
}
}

package webservice;

import javax.jws.WebService;

@WebService(endpointInterface="webservice.HelloWebservice",serviceName="hellows",portName="hellowsport")
public class HelloWebserviceImpl implements HelloWebservice{
	public String getWebservice(String name) {
		return "你好["+name+"]這是來自webservice的信息..."+this;
	}
}

最後創建服務器端啓動代碼，只要運行main方法即可。當前WebService沒有部署在tomcat之類的服務器下，而是通過jetty部署的：

Java代碼

package webservice;
import javax.xml.ws.Endpoint;
public class WebserviceServer {
protected WebserviceServer() throws Exception {
// START SNIPPET: publish
System.out.println("Server Starting...");
HelloWebservice hello = new HelloWebserviceImpl();
String address = "http://localhost:8888/hellows";
Endpoint.publish(address, hello);
// END SNIPPET: publish
}
public static void main(String[] args) throws Exception {
//啓動web服務
new WebserviceServer();
System.out.println("Server ready...");
Thread.sleep(5 * 60 * 1000);
System.out.println("Server exiting...");
System.exit(0);
}
}

package webservice;

import javax.xml.ws.Endpoint;

public class WebserviceServer {
	protected WebserviceServer() throws Exception {  
        // START SNIPPET: publish
        System.out.println("Server Starting...");  
        HelloWebservice hello = new HelloWebserviceImpl(); 
        String address = "http://localhost:8888/hellows";
        Endpoint.publish(address, hello);
        // END SNIPPET: publish
    }
	
	public static void main(String[] args) throws Exception {
		//啓動web服務
        new WebserviceServer();
        System.out.println("Server ready...");
        Thread.sleep(5 * 60 * 1000);  
        System.out.println("Server exiting...");
        System.exit(0);
    }
}

爲了驗證WebService是否啓動成功，可以在瀏覽器下放入如下地址：http://localhost:8888/hellows?wsdl，如果部署成功，則瀏覽器會顯示wsdl的xml配置信息。

【Flex端代碼】

Xml代碼

<fx:Script>
<![CDATA[
//WebService調用
protected function button3_clickHandler(event:MouseEvent):void
{
var ws:WebService = new WebService();
ws.wsdl = "http://localhost:8888/hellows?wsdl";
ws.loadWSDL();
ws.getWebservice(webservice_txt.text);
ws.addEventListener(ResultEvent.RESULT,function callback(e:ResultEvent):void{
webservice_result.text = e.result.toString()
});
}
]]>
</fx:Script>
<s:Label x="61" y="215" text="WebService:"/>
<s:TextInput x="152" y="205" id="webservice_txt"/>
<s:Button x="289" y="206" label="發送" click="button3_clickHandler(event)"/>
<s:Label x="383" y="215" id="webservice_result"/>

<fx:Script>
		<![CDATA[
               //WebService調用
			protected function button3_clickHandler(event:MouseEvent):void
			{
				var ws:WebService = new WebService();
				ws.wsdl = "http://localhost:8888/hellows?wsdl";
				ws.loadWSDL();
				ws.getWebservice(webservice_txt.text);
				ws.addEventListener(ResultEvent.RESULT,function callback(e:ResultEvent):void{
					webservice_result.text = e.result.toString()
				});
			}
              
              ]]>
</fx:Script>

<s:Label x="61" y="215" text="WebService:"/>
	<s:TextInput x="152" y="205" id="webservice_txt"/>
	<s:Button x="289" y="206" label="發送" click="button3_clickHandler(event)"/>
	<s:Label x="383" y="215" id="webservice_result"/>

注意，WebService，HttpService和RemoteObject發送請求都是異步的，開發人員需要編寫回調函數來獲取返回數據。

最後運行flex，在文本框中輸入內容，點擊發送按鈕就能看到java服務端返回的數據。

HttpService通信

【java代碼】

首先創建一個servlet，這裏獲取key值爲"name"的數據（所以Flex端需要發送一個key爲"name"的參數），最後通過PrintWriter.write的形式將結果返回給客戶端。這是一個典型的Ajax請求響應例子。

Java代碼

public class HelloHttp extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String name = request.getParameter("name");
response.setCharacterEncoding("UTF-8");
PrintWriter pw = response.getWriter();
pw.write("你好["+name+"]這是來自Httpservice的消息...當前Session是："+request.getSession());
pw.close();
}
}

public class HelloHttp extends HttpServlet {
	private static final long serialVersionUID = 1L;
	
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		this.doPost(request, response);
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String name = request.getParameter("name");
		response.setCharacterEncoding("UTF-8");
		PrintWriter pw = response.getWriter();
		pw.write("你好["+name+"]這是來自Httpservice的消息...當前Session是："+request.getSession());
		pw.close();
	}
}

編寫完成後，將java項目部署到服務器中（我使用的是tomcat）。

【Flex代碼】

Flex端需要創建一個HttpService對象來訪問剛纔的Servlet：

Xml代碼

<SPAN style="WHITE-SPACE: pre"> </SPAN><fx:Script>
<![CDATA[
//HttpService的形式訪問Java服務器
protected function button2_clickHandler(event:MouseEvent):void
{
var http:HTTPService = new HTTPService();
http.url = "http://localhost:8080/JavaToFlex/HelloHttp?name="+http_txt.text;
http.send();
http.addEventListener(ResultEvent.RESULT,function callback(e:ResultEvent):void{
http_result.text = e.result.toString();
});
}
]]>
</fx:Script>
<SPAN style="WHITE-SPACE: pre"> </SPAN><s:Label x="61" y="138" text="HttpService:"/>
<s:TextInput x="152" y="128" id="http_txt"/>
<s:Button x="289" y="129" label="發送" click="button2_clickHandler(event)"/>
<s:Label x="383" y="138" id="http_result"/>

	<fx:Script>
		<![CDATA[
			//HttpService的形式訪問Java服務器
			protected function button2_clickHandler(event:MouseEvent):void
			{
				var http:HTTPService = new HTTPService();
				http.url = "http://localhost:8080/JavaToFlex/HelloHttp?name="+http_txt.text;
				http.send();
				http.addEventListener(ResultEvent.RESULT,function callback(e:ResultEvent):void{
					http_result.text = e.result.toString();
				});
			}
			
			]]>
	</fx:Script>

	<s:Label x="61" y="138" text="HttpService:"/>
	<s:TextInput x="152" y="128" id="http_txt"/>
	<s:Button x="289" y="129" label="發送" click="button2_clickHandler(event)"/>
	<s:Label x="383" y="138" id="http_result"/>

RemoteObject通信

爲了實現Flex調用Java代碼，需要引入一個新的插件Blaseds。

把Blaseds項目WEB-INf下的flex文件夾拷貝到Java項目WEB-INF目錄下，再將Blaseds項目下lib目錄的jar文件引入到java項目中（注意jar文件衝突）。

隨後編寫一個Java類：

Java代碼

package blaseds;
import flex.messaging.FlexContext;
public class RemoteClass {
public String helloRemote(String name){
return "你好["+name+"]這是來自JavaRemote的消息...當前Session是："+FlexContext.getHttpRequest().getSession();
}
}

package blaseds;

import flex.messaging.FlexContext;

public class RemoteClass {
	public String helloRemote(String name){
		return "你好["+name+"]這是來自JavaRemote的消息...當前Session是："+FlexContext.getHttpRequest().getSession();
	}
}

隨後在web.xml中添加如下內容（這些配置在Blaseds文件的web.xml中都能找到）：

Xml代碼

<listener>
<listener-class>flex.messaging.HttpFlexSession</listener-class>
</listener>
<servlet>
<display-name>MessageBrokerServlet</display-name>
<servlet-name>MessageBrokerServlet</servlet-name>
<servlet-class>flex.messaging.MessageBrokerServlet</servlet-class>
<init-param>
<param-name>services.configuration.file</param-name>
<param-value>/WEB-INF/flex/services-config.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet>
<display-name>RDSDispatchServlet</display-name>
<servlet-name>RDSDispatchServlet</servlet-name>
<servlet-class>flex.rds.server.servlet.FrontEndServlet</servlet-class>
<init-param>
<param-name>useAppserverSecurity</param-name>
<param-value>false</param-value>
</init-param>
<load-on-startup>10</load-on-startup>
</servlet>
<servlet-mapping id="RDS_DISPATCH_MAPPING">
<servlet-name>RDSDispatchServlet</servlet-name>
<url-pattern>/CFIDE/main/ide.cfm</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>MessageBrokerServlet</servlet-name>
<url-pattern>/messagebroker/*</url-pattern>
</servlet-mapping>

<!-- Http Flex Session attribute and binding listener support -->
    <listener>
        <listener-class>flex.messaging.HttpFlexSession</listener-class>
    </listener>

    <!-- MessageBroker Servlet -->
    <servlet>
    	<display-name>MessageBrokerServlet</display-name>
        <servlet-name>MessageBrokerServlet</servlet-name>
        <servlet-class>flex.messaging.MessageBrokerServlet</servlet-class>
        <init-param>
            <param-name>services.configuration.file</param-name>
            <param-value>/WEB-INF/flex/services-config.xml</param-value>
       </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
	
	<servlet>
		<display-name>RDSDispatchServlet</display-name>
        <servlet-name>RDSDispatchServlet</servlet-name>
        <servlet-class>flex.rds.server.servlet.FrontEndServlet</servlet-class>
		<init-param>
			<param-name>useAppserverSecurity</param-name>
			<param-value>false</param-value>
		</init-param>        
        <load-on-startup>10</load-on-startup>
    </servlet>

    <servlet-mapping id="RDS_DISPATCH_MAPPING">
        <servlet-name>RDSDispatchServlet</servlet-name>
        <url-pattern>/CFIDE/main/ide.cfm</url-pattern>
    </servlet-mapping>
    
    <servlet-mapping>
        <servlet-name>MessageBrokerServlet</servlet-name>
        <url-pattern>/messagebroker/*</url-pattern>
    </servlet-mapping>

最後打開Java項目，打開/WEB-INF/flex/remoting-config.xml文件，在文件中添加RemoteClass的遠程支持：

Xml代碼

<service id="remoting-service" class="flex.messaging.services.RemotingService">
<adapters>
<adapter-definition id="java-object"
class="flex.messaging.services.remoting.adapters.JavaAdapter"
default="true" />
</adapters>
<default-channels>
<channel ref="my-amf" />
</default-channels>
<destination id="remoteClass">
<properties>
<source>blaseds.RemoteClass</source>
</properties>
</destination>
</service>

<service id="remoting-service" class="flex.messaging.services.RemotingService">

	<adapters>
		<adapter-definition id="java-object"
			class="flex.messaging.services.remoting.adapters.JavaAdapter"
			default="true" />
	</adapters>

	<default-channels>
		<channel ref="my-amf" />
	</default-channels>
	
	<!-- 定義遠程調用的目標名 -->
	<destination id="remoteClass">
		<properties>
			<source>blaseds.RemoteClass</source>
		</properties>
	</destination>
</service>

隨後將Java項目部署到服務器中。

【Flex端代碼】

Flex端爲了調用Java代碼，需要創建一個RemoteObject實例，屬性destination就是在Java端remoting-config.xml文件中定義的<destination id="remoteClass">，這樣你可以把RemoteObject當作一個RemoteClass的實例使用。

Xml代碼

<fx:Script>
<![CDATA[
//RemoteObject遠程調用Java方法
protected function button1_clickHandler(event:MouseEvent):void
{
var remote:RemoteObject = new RemoteObject();
remote.destination = "remoteClass";
remote.helloRemote(remote_txt.text);
remote.addEventListener(ResultEvent.RESULT,function callback(e:ResultEvent):void{
remote_result.text = e.result.toString();
});
}
]]>
</fx:Script>
<s:Label x="61" y="67" text="RemoteObject:"/>
<s:TextInput x="152" y="57" id="remote_txt"/>
<s:Button x="289" y="58" label="發送" click="button1_clickHandler(event)"/>
<s:Label x="383" y="67" id="remote_result"/>

<fx:Script>
		<![CDATA[

			//RemoteObject遠程調用Java方法
			protected function button1_clickHandler(event:MouseEvent):void
			{
				var remote:RemoteObject = new RemoteObject();
				remote.destination = "remoteClass";
				remote.helloRemote(remote_txt.text);
				remote.addEventListener(ResultEvent.RESULT,function callback(e:ResultEvent):void{
					remote_result.text = e.result.toString();
				});
			}
			
		]]>
	</fx:Script>

<s:Label x="61" y="67" text="RemoteObject:"/>
	<s:TextInput x="152" y="57" id="remote_txt"/>
	<s:Button x="289" y="58" label="發送" click="button1_clickHandler(event)"/>
	<s:Label x="383" y="67" id="remote_result"/>

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