openfire以前的版本，可以在调试时，直接把xml输出到控制台。但现在不能输出了。我跟了下源码。调试输出是由插件 Debugger Plugin  实现的。

位于源码目录：src\plugins\xmldebugger

public void initializePlugin(PluginManager manager, File pluginDirectory) {
        // Add filter to filter chain builder
        ConnectionManagerImpl connManager = (ConnectionManagerImpl) XMPPServer.getInstance().getConnectionManager();
        defaultPortFilter = new RawPrintFilter("C2S");
        SocketAcceptor socketAcceptor = connManager.getSocketAcceptor();
        if (socketAcceptor != null) {
            socketAcceptor.getFilterChain().addBefore("xmpp", "rawDebugger", defaultPortFilter);
        }
        oldPortFilter = new RawPrintFilter("SSL");
        SocketAcceptor sslAcceptor = connManager.getSSLSocketAcceptor();
        if (sslAcceptor != null) {
            sslAcceptor.getFilterChain().addBefore("xmpp", "rawDebugger", oldPortFilter);
        }

        componentPortFilter = new RawPrintFilter("ExComp");
        SocketAcceptor componentAcceptor = connManager.getComponentAcceptor();
        if (componentAcceptor != null) {
            componentAcceptor.getFilterChain().addBefore("xmpp", "rawDebugger", componentPortFilter);
        }

        multiplexerPortFilter = new RawPrintFilter("CM");
        SocketAcceptor multiplexerAcceptor = connManager.getMultiplexerSocketAcceptor();
        if (multiplexerAcceptor != null) {
            multiplexerAcceptor.getFilterChain().addBefore("xmpp", "rawDebugger", multiplexerPortFilter);
        }

        interpretedPrinter = new InterpretedXMLPrinter();
        if (JiveGlobals.getBooleanProperty("plugin.debugger.interpretedAllowed")) {
            // Add the packet interceptor that prints interpreted XML
            InterceptorManager.getInstance().addInterceptor(interpretedPrinter);
        }
        // Listen to property events
        PropertyEventDispatcher.addListener(this);
    }

从初始化代码看，已经允许 c2s 打印。我跟踪代码后，发现在下面代码 message instanceof ByteBuffer 条件是 false

	public void messageReceived(NextFilter nextFilter, IoSession session, Object message) throws Exception {
        // Decode the bytebuffer and print it to the stdout
    	if (enabled && message instanceof ByteBuffer) {
            ByteBuffer byteBuffer = (ByteBuffer) message;
            // Keep current position in the buffer
            int currentPos = byteBuffer.position();
            // Decode buffer
            Charset encoder = Charset.forName("UTF-8");
            CharBuffer charBuffer = encoder.decode(byteBuffer.asReadOnlyBuffer());
            // Print buffer content
            System.out.println(prefix + " - RECV (" + session.hashCode() + "): " + charBuffer);
            // Reset to old position in the buffer
            byteBuffer.position(currentPos);
        }
        // Pass the message to the next filter
        super.messageReceived(nextFilter, session, message);
    }

还好，调试提供直接打印 xml 输出：

public class InterpretedXMLPrinter implements PacketInterceptor {

    public void interceptPacket(Packet packet, Session session, boolean incoming, boolean processed)
            throws PacketRejectedException {
        if (!processed && incoming) {
            System.out.println("INTERPRETED: " + packet.toXML());
        }
    }
}

从初始化代码中可以看到要启用上面功能，需要设置 plugin.debugger.interpretedAllowed 为 true，openfire 默认为 false

所以，登录管理端，把它加到服务器-》系统属性中。xml 可以输出到控制端了。

openfire 开发时输出xml到控制台