Flex and Java Communication three: Httpservice

Three ways for flex to communicate with Java:

1. Through Httpservice: You access an XML or servlet, and then flex receives the returned XML data
2. Through WebService: You access a WebService service, and then get the text message
3. Through RemoteObject: The remote Service interface method can be accessed through blazeds, and Flex receives an object.

Build the project: (from Baidu Library, "Flex (Eclipse) Development configuration Manual. pdf")

Flexhttpservice Access defines the Httpservice method in Javaflex:
1. Define a servlet in Javaflex that returns an XML

Package my.servlet;
Import java.io.IOException;

Import Java.io.PrintWriter;
Import javax.servlet.ServletException;
Import Javax.servlet.http.HttpServlet;
Import Javax.servlet.http.HttpServletRequest;

Import Javax.servlet.http.HttpServletResponse; @SuppressWarnings ("Serial") public class Httpserviceservlet extends HttpServlet {@Override protected void service (Http 
		ServletRequest req, HttpServletResponse resp) throws Servletexception, IOException {resp.setcontenttype ("text/xml");
		Resp.setcharacterencoding ("Utf-8");
		PrintWriter out = Resp.getwriter ();
		Out.println ("<?xml version=\" 1.0\ "encoding=\" utf-8\ "?>");
		Out.println ("<rows>");
		Out.println ("<row>");
		Out.println ("<id>");
		Out.println ("1");
		Out.println ("</id>");
		Out.println ("<msg>");
		Out.println ("Hello");
		Out.println ("</msg>");
		Out.println ("</row>");
		Out.println ("<row>");
		Out.println ("<id>");
		Out.println ("2"); Out.println ("</id>"));
		Out.println ("<msg>");
		Out.println ("haha");
		Out.println ("</msg>");
		Out.println ("</row>");
		Out.println ("</rows>");
	Out.close ();
 }

}

To configure the servlet in Web.xml:

<servlet>
  <servlet-name>MyHttpServiceServlet</servlet-name>
  <servlet-class> my.servlet.httpserviceservlet</servlet-class>
 </servlet>
 <servlet-mapping>
  < Servlet-name>myhttpserviceservlet</servlet-name>
  <url-pattern>/myhttpserviceservlet</ Url-pattern>
 </servlet-mapping>

2. Define and Access Myhttpserviceservlet in Flexhttpservice:
Defined:

	<fx:Declarations>
		<!--place non-visual elements (such as services, value objects) here-->
		<s:httpservice id= "GetData" method= "POST"
					   url= "Http://localhost:8080/javaFlex/MyHttpServiceServlet" useproxy= "false"/>
	</fx:declarations >

You can also configure it in Proxy-config without specifying a URL: Proxy-config.xml configure Httpservice The URL address to request, and the "destination" mapping relationship in the program to access the URL
Access:

<s:button label= "Get Data" click= "Getdata.send ()"/>

Get the result:

	<mx:datagrid width= "332" height= "160" dataprovider= "{GetData.lastResult.rows.row}" >

3. Results:


---------------------------------------------------------Gorgeous split Line--------------------------------------------------------- ----------------------
The problem with Cross-domain access is not resolved above:
From: http://hi.baidu.com/hakerivan/item/211218d6c6a348866cce3f7f (not validated)

Sand Box Effect Method:

1, using UseProxy properties and crossdomain.xml can be accessed across domains, which is one of the solutions.

2, write a JS or PHP script, with Ajax (XMLHTTP Object) to access the Cross-domain URL.

Web-inf\flex\proxy-config.xml:

<destination id= "Catalog" > 
    <properties> 
            <url>/{context.root}/testdrive-httpservice/ Catalog.jsp</url> 
        </properties> 
    

Other: Flash cross-Domain policy file crossdomain.xml configuration httpservice use useproxy parameters