Apache CXF暴露服务-学习笔记

CXF 暴露WebService的思路，以在Jetty为Web Container为例来描述。

Demo 代码

public static void main(String[] args) {
        // Create our service implementation
        HelloWorldImpl helloWorldImpl = new HelloWorldImpl();


        // Create our Server
        ServerFactoryBean svrFactory = new ServerFactoryBean();
        svrFactory.setServiceClass(HelloWorld.class);
        svrFactory.setAddress("http://localhost:9000/Hello");
        svrFactory.setServiceBean(helloWorldImpl);
        svrFactory.create();


    }

步骤：
1. ServerFactoryBean创建server,这个不是运行的server，可以成Server端Service

 public Server create() {
        ClassLoader orig = Thread.currentThread().getContextClassLoader();
        try {
            try {
                if (bus != null) {
                    ClassLoader loader = bus.getExtension(ClassLoader.class);
                    if (loader != null) {
                        Thread.currentThread().setContextClassLoader(loader);
                    }
                }
    
                if (getServiceFactory().getProperties() == null) {
                    getServiceFactory().setProperties(getProperties());
                } else if (getProperties() != null) {
                    getServiceFactory().getProperties().putAll(getProperties());
                }
                if (serviceBean != null && getServiceClass() == null) {
                    setServiceClass(ClassHelper.getRealClass(serviceBean));
                }
                if (invoker != null) {
                    getServiceFactory().setInvoker(invoker);
                } else if (serviceBean != null) {
                    invoker = createInvoker();
                    getServiceFactory().setInvoker(invoker);
                }
    
                Endpoint ep = createEndpoint();
                server = new ServerImpl(getBus(),
                                        ep,
                                        getDestinationFactory(),
                                        getBindingFactory());
    
                if (ep.getService().getInvoker() == null) {
                    if (invoker == null) {
                        ep.getService().setInvoker(createInvoker());
                    } else {
                        ep.getService().setInvoker(invoker);
                    }
                }
    
            } catch (EndpointException e) {
                throw new ServiceConstructionException(e);
            } catch (BusException e) {
                throw new ServiceConstructionException(e);
            } catch (IOException e) {
                throw new ServiceConstructionException(e);
            }
            
            if (serviceBean != null) {
                Class<?> cls = ClassHelper.getRealClass(getServiceBean());
                if (getServiceClass() == null || cls.equals(getServiceClass())) {
                    initializeAnnotationInterceptors(server.getEndpoint(), cls);
                } else {
                    initializeAnnotationInterceptors(server.getEndpoint(), cls, getServiceClass());
                }
            } else if (getServiceClass() != null) {
                initializeAnnotationInterceptors(server.getEndpoint(), getServiceClass());
            }
    
            applyFeatures();
   
            getServiceFactory().sendEvent(FactoryBeanListener.Event.SERVER_CREATED, server, serviceBean,
                                          serviceBean == null 
                                          ? getServiceClass() == null 
                                              ? getServiceFactory().getServiceClass() 
                                              : getServiceClass()
                                          : getServiceClass() == null
                                              ? ClassHelper.getRealClass(getServiceBean()) 
                                              : getServiceClass());
            
            if (start) {
                server.start();
            }
            return server;
        } finally {
            Thread.currentThread().setContextClassLoader(orig);
        }            
    }  

2.Server启动

public void start() {
        if (!stopped) {
            return;
        }
        LOG.fine("Server is starting.");
        
        if (messageObserver != null) {
            destination.setMessageObserver(messageObserver);
        } else {
            bindingFactory.addListener(destination, endpoint);
        }
        
        // register the active server to run
        if (null != serverRegistry) {
            LOG.fine("register the server to serverRegistry ");
            serverRegistry.register(this);
        }
        
        if (slcMgr != null) {
            slcMgr.startServer(this);
        }
        stopped = false;
    }
    
3.SoapBindingFactory加入Listener


public synchronized void addListener(Destination d, Endpoint e) {
        MessageObserver mo = d.getMessageObserver();
        if (mo == null) {
            super.addListener(d, e);
            return;
        }
        

3.SoapBindingFactory加入Listener

public synchronized void addListener(Destination d, Endpoint e) {
        MessageObserver mo = d.getMessageObserver();
        if (mo == null) {
            super.addListener(d, e);
            return;
        }

4. AbstractBindingFactory 为Destination设置observer

public void addListener(Destination d, Endpoint e) {
        ChainInitiationObserver observer = new ChainInitiationObserver(e, bus);


        d.setMessageObserver(observer);
    }

5.JettyHTTPDestination设置observer

public synchronized void setMessageObserver(MessageObserver observer) {
        if (observer != incomingObserver) {
            MessageObserver old = incomingObserver;
            incomingObserver = observer;
            if (observer != null) {
                getLogger().fine("registering incoming observer: " + observer);
                if (old == null) {
                    try {
                        activate();
                    } catch (RuntimeException ex) {
                        incomingObserver = null;
                        throw ex;
                    }
                }
            } else {
                if (old != null) {
                    getLogger().fine("unregistering incoming observer: " + old);
                    deactivate();
                }
            }
        }
    }

6.JettyHTTPDestination,激活绑定的内容，调用web enginge发布服务，

protected void activate() {
        LOG.log(Level.FINE, "Activating receipt of incoming messages");
        URL url = null;
        try {
            url = new URL(endpointInfo.getAddress());
        } catch (Exception e) {
            throw new Fault(e);
        }
        engine.addServant(url, 
                          new JettyHTTPHandler(this, contextMatchOnExact()));
    }

7.JettyHTTPServerEngine将endpoint绑定到具体web container(这里是jetty),新建一个web 应用

public synchronized void addServant(URL url, JettyHTTPHandler handler) {
        SecurityHandler securityHandler = null;
        if (server == null) {
            DefaultHandler defaultHandler = null;
            // create a new jetty server instance if there is no server there            
            server = new Server();
            
            Container.Listener mBeanContainer = factory.getMBeanContainer();
            if (mBeanContainer != null) {
                server.getContainer().addEventListener(mBeanContainer);
            }
            
            if (connector == null) {
                connector = connectorFactory.createConnector(getHost(), getPort());
                if (LOG.isLoggable(Level.FINER)) {
                    LOG.finer("connector.host: " 
                              + connector.getHost() == null 
                                ? "null" 
                                : "\"" + connector.getHost() + "\"");
                    LOG.finer("connector.port: " + connector.getPort());
                }
            } 


            server.addConnector(connector);
            /*
             * The server may have no handler, it might have a collection handler,
             * it might have a one-shot. We need to add one or more of ours.
             *
             */
            int numberOfHandlers = 1;
            if (handlers != null) {
                numberOfHandlers += handlers.size();
            }
            Handler existingHandler = server.getHandler();


            HandlerCollection handlerCollection = null;
            boolean existingHandlerCollection = existingHandler instanceof HandlerCollection;
            if (existingHandlerCollection) {
                handlerCollection = (HandlerCollection) existingHandler;
            }


            if (!existingHandlerCollection 
                &&
                (existingHandler != null || numberOfHandlers > 1)) {
                handlerCollection = new HandlerCollection();
                if (existingHandler != null) {
                    handlerCollection.addHandler(existingHandler);
                }
                server.setHandler(handlerCollection);
            }
            
            /*
             * At this point, the server's handler is a collection. It was either
             * one to start, or it is now one containing only the single handler
             * that was there to begin with.
             */
            if (handlers != null && handlers.size() > 0) {
                for (Handler h : handlers) {
                    // Filtering out the jetty default handler 
                    // which should not be added at this point.
                    if (h instanceof DefaultHandler) {
                        defaultHandler = (DefaultHandler) h;
                    } else {
                        if ((h instanceof SecurityHandler) 
                            && ((SecurityHandler)h).getHandler() == null) {
                            //if h is SecurityHandler(such as ConstraintSecurityHandler)
                            //then it need be on top of JettyHTTPHandler
                            //set JettyHTTPHandler as inner handler if 
                            //inner handler is null
                            ((SecurityHandler)h).setHandler(handler);
                            securityHandler = (SecurityHandler)h;
                        } else {
                            handlerCollection.addHandler(h);
                        }
                    }
                }
            }
            contexts = new ContextHandlerCollection();
            /*
             * handlerCollection may be null here if is only one handler to deal with.
             * Which in turn implies that there can't be a 'defaultHander' to deal with.
             */
            if (handlerCollection != null) {
                handlerCollection.addHandler(contexts);
                if (defaultHandler != null) {
                    handlerCollection.addHandler(defaultHandler);
                }
            } else {
                server.setHandler(contexts);
            }


            try {                
                setReuseAddress(connector);
                setupThreadPool();
                server.start();
            } catch (Exception e) {
                LOG.log(Level.SEVERE, "START_UP_SERVER_FAILED_MSG", new Object[] {e.getMessage(), port});
                //problem starting server
                try {                    
                    server.stop();
                    server.destroy();
                } catch (Exception ex) {
                    //ignore - probably wasn't fully started anyway
                }
                server = null;
                throw new Fault(new Message("START_UP_SERVER_FAILED_MSG", LOG, e.getMessage(), port), e);
            }
        }        
        
        String contextName = HttpUriMapper.getContextName(url.getPath());            
        ContextHandler context = new ContextHandler();
        context.setContextPath(contextName);
        // bind the jetty http handler with the context handler
        if (isSessionSupport) {         
            // If we have sessions, we need two handlers.
            if (sessionManager == null) {
                sessionManager = new HashSessionManager();
                HashSessionIdManager idManager = new HashSessionIdManager();
                
                try {
                    //for JETTY 7.5
                    sessionManager.getClass().getMethod("setSessionIdManager", SessionIdManager.class)
                        .invoke(sessionManager, idManager);
                } catch (Exception e) {
                    //for JETTY <=7.4.x
                    try {
                        sessionManager.getClass().getMethod("setIdManager", SessionIdManager.class)
                            .invoke(sessionManager, idManager);
                    } catch (Exception e1) {
                        throw new Fault(new Message("START_UP_SERVER_FAILED_MSG", LOG,
                                                    e.getMessage(), port), e);                        
                    }
                }
            }
            SessionHandler sessionHandler = new SessionHandler(sessionManager);
            if (securityHandler != null) {
                //use the securityHander which already wrap the jetty http handler
                sessionHandler.setHandler(securityHandler);
            } else {
                sessionHandler.setHandler(handler);
            }
            context.setHandler(sessionHandler);
        } else {
            // otherwise, just the one.
            if (securityHandler != null) {
                //use the securityHander which already wrap the jetty http handler
                context.setHandler(securityHandler);
            } else {
                context.setHandler(handler);
            }
        }
        contexts.addHandler(context);
        
        ServletContext sc = context.getServletContext();
        handler.setServletContext(sc);
       
        final String smap = HttpUriMapper.getResourceBase(url.getPath());
        handler.setName(smap);
        
        if (contexts.isStarted()) {           
            try {                
                context.start();
            } catch (Exception ex) {
                LOG.log(Level.WARNING, "ADD_HANDLER_FAILED_MSG", new Object[] {ex.getMessage()});
            }
        }
        
            
        ++servantCount;
    }

访问http://localhost:9000/Hello?wsdl可以看到效果,服务已经发布.


参考：
http://cxf.apache.org/docs/simple-frontend.html