CXF restful 请求过程分析

最新推荐文章于 2023-09-26 13:12:06 发布

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最新推荐文章于 2023-09-26 13:12:06 发布 · 1k 阅读

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#cxf

本文深入分析了Apache CXF框架处理RESTful风格API请求的全过程，从Servlet入口到Message对象的创建，再到拦截器链的执行，详细解读了CXF如何解析并响应HTTP请求。

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最近(5年前写的未发布)在做CXF restful 风格接口，为了更好的集成框架，所以分析下cxf请求过程，在此记录下，

首先从org.apache.cxf.transport.servlet.CXFServlet作为入口来解析请求过程

从父类AbstractHTTPServlet的service方法开始进入

 @Override
    public void service(ServletRequest req, ServletResponse res)
        throws ServletException, IOException {
        
        HttpServletRequest      request;
        HttpServletResponse     response;
        
        try {
            request = (HttpServletRequest) req;
            response = (HttpServletResponse) res;
        } catch (ClassCastException e) {
            throw new ServletException("Unrecognized HTTP request or response object");
        }
        
        String method = request.getMethod();
        if (KNOWN_HTTP_VERBS.contains(method)) {
            super.service(request, response);//这个父类的方法最终调用了CXFServlet的get或者post方法,而两个方法都调用了handleRequest这个方法
        } else {
            handleRequest(request, response);
        }
    }

进入handleRequest方法：

 protected void handleRequest(HttpServletRequest request, HttpServletResponse response) 
        throws ServletException {
        if ((dispatcherServletPath != null || dispatcherServletName != null)
            && (redirectList != null && matchPath(redirectList, request)
                || redirectList == null)) {
            // if no redirectList is provided then this servlet is redirecting only
            redirect(request, response, request.getPathInfo());
            return;
        }
        boolean staticResourcesMatch = staticResourcesList != null 
            && matchPath(staticResourcesList, request);
        boolean staticWelcomeFileMatch = staticWelcomeFile != null 
            && (StringUtils.isEmpty(request.getPathInfo()) || request.getPathInfo().equals("/")); 
        if (staticResourcesMatch || staticWelcomeFileMatch) {
            serveStaticContent(request, response, 
                               staticWelcomeFileMatch ? staticWelcomeFile : request.getPathInfo());
            return;
        }
        request = checkXForwardedHeaders(request);
        invoke(request, response);// 父类CXFNonSpringServlet的方法,最终调用了ServletController的invoke方法，
    }

我们直接进入ServletController的invoke方法：

 public boolean invoke(HttpServletRequest request, HttpServletResponse res, boolean returnErrors)
        throws ServletException {
        try {
            String pathInfo = request.getPathInfo() == null ? "" : request.getPathInfo();
            AbstractHTTPDestination d = destinationRegistry.getDestinationForPath(pathInfo, true);

            if (d == null) {
                if (!isHideServiceList && (request.getRequestURI().endsWith(serviceListRelativePath)
                    || request.getRequestURI().endsWith(serviceListRelativePath + "/")
                    || StringUtils.isEmpty(pathInfo)
                    || "/".equals(pathInfo))) {
                    if (isAuthServiceListPage) {
                        setAuthServiceListPageAttribute(request);
                    }
                    setBaseURLAttribute(request);
                    serviceListGenerator.service(request, res);
                } else {
                    d = destinationRegistry.checkRestfulRequest(pathInfo);
                    if (d == null || d.getMessageObserver() == null) {
                        if (returnErrors) {
                            LOG.warning("Can't find the the request for "
                                + request.getRequestURL() + "'s Observer ");
                            generateNotFound(request, res);
                        }
                        return false;
                    }
                }
            }
            if (d != null) {
                Bus bus = d.getBus();
                ClassLoaderHolder orig = null;
                try {
                    if (bus != null) {
                        ClassLoader loader = bus.getExtension(ClassLoader.class);
                        if (loader == null) {
                            ResourceManager manager = bus.getExtension(ResourceManager.class);
                            if (manager != null) {
                                loader = manager.resolveResource("", ClassLoader.class);
                            }
                        }
                        if (loader != null) {
                            //need to set the context classloader to the loader of the bundle
                            orig = ClassLoaderUtils.setThreadContextClassloader(loader);
                        }
                    }
                    updateDestination(request, d);
                    invokeDestination(request, res, d); //调用处理方法
                } finally {