flash - 柔性 socket 连接

Question

我有一个Groovy服务器和Flex客户端。当我尝试从Flex连接到Groovy应用程序时，我显示<policy-file-request/>消息。然后，我发送一些策略XML响应，并尝试将某些内容发送到服务器。但是我没有得到Groovy方面的帮助，反而一无所获。几秒钟后，我在Flex应用程序端收到了SecurityException。

Groovy服务器代码:

import java.util.Scanner

class server
{
    public static handleConnection(client)
    {
        PrintWriter socketwriter = new PrintWriter(client.getOutputStream())

        Scanner socketreader = new Scanner(client.getInputStream())

        while (socketreader.hasNext())
        {
            String s = socketreader.nextLine()

            println s

            if (s =~ /<policy-file-request\s*\/>/)
            {

                socketwriter.print("<?xml version=\"1.0\"?><!DOCTYPE cross-domain-policy SYSTEM \"/xml/dtds/cross-domain-policy.dtd\"><cross-domain-policy><site-control permitted-cross-domain-policies=\"master-only\" /><allow-access-from domain=\"*\" to-ports=\"2900-2910\" /></cross-domain-policy>\n\0\n")

                socketwriter.flush()
                socketwriter.close()
                client.close()

                println "Policy File sent."

                return
            }
        }

        socketwriter.print("Connection: Done.\n")
        socketwriter.flush()

        socketwriter.close()
        socketreader.close()
    }

    static main(args)
    {
        ServerSocket serversocket

        try
        {
            serversocket = new ServerSocket(2900)

            println "Server is up and running"

            while (true)
            {
                Socket client = serversocket.accept()

                Thread.start {
                    server.handleConnection(client)
                }
            }
        } catch (e)
        {
            e.printStackTrace()
        } finally
        {
            serversocket.close()
        }
    }
}

Flex客户端代码:

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
    <mx:Script>
        <![CDATA[
            import flash.net.Socket;
            import flash.events.*;
            import mx.controls.Alert;

            private var socket : Socket;

            private function connect() : void 
            {
                socket = new Socket();

                socket.addEventListener(Event.CONNECT, onConnect);
                socket.addEventListener(ProgressEvent.SOCKET_DATA, onSocketData);
                socket.addEventListener(SecurityErrorEvent.SECURITY_ERROR, ServerSecurityError);

                socket.connect("localhost", 2900);

                Alert.show("yay!");
            }

            private function ServerSecurityError(evt : Event) : void
            {
                Alert.show("security error")
            }

            private function onConnect(evt : Event) : void
            {
                Alert.show("Connected to server!");
            }

            private function onSocketData(evt : ProgressEvent) : void
            {
                var data : String = socket.readUTFBytes(socket.bytesAvailable);
                Alert.show("Read: " + data);
            }

            private function send() : void 
            {
               var msg : String = "Hello, World!";
               socket.writeUTFBytes(msg);
               socket.flush();
               Alert.show("Sent: " + msg);
            }
        ]]>
    </mx:Script>

    <mx:Button label="connect" click="connect()" x="10" y="10" />
    <mx:Button label="send something" click="send()" x="10" y="40" />
</mx:Application>

因此，问题是:我应该如何连接才能在服务器和客户端之间获得稳定的通信？

Answer 1

出于以下原因(从文档中)出现SecurityError:

本地不受信任的SWF文件无法与Internet通信。你
可以通过将文件重新分类为
本地联网或受信任。

您无法指定套接字端口
高于65535。

在包含SWF内容的HTML页面中，
对象和embed标签的allowNetworking参数设置为
“没有”。

我们正在运行类似的设置(使用纯AS3前端)，并且在调用 connect()之前，我调用了:
Security.loadPolicyFile( "xmlsocket://" + this.m_host + ":" + this.m_policyFilePort );
其中 m_host可以是“localhost”之类的，而 m_policyFilePort是您要为其提供服务的端口。您可以在 here或 at the Socket files上找到更多信息