美文网首页Spring Boot教程与经验Spring Boot
SpringBoot 集成jax-ws无法使用@Autowire

SpringBoot 集成jax-ws无法使用@Autowire

作者: 大罗马的太阳 | 来源:发表于2017-01-13 22:18 被阅读1126次

    继承SpringBeanAutowiringSupport后依然无法使用@Autowired
    o.s.w.c.s.SpringBeanAutowiringSupport : Current WebApplicationContext is not available for processing of PortalApplication: Make sure this class gets constructed in a Spring web application. Proceeding without injection.

    原因分析

    jax-ws 中bean的生命周期管理是不受spring 控制的。所以需要显式继承 SpringBeanAutowiringSupport
    来看下实现源码,非常巧妙

    /**
         * This constructor performs injection on this instance,
         * based on the current web application context.
         * <p>Intended for use as a base class.
         * @see #processInjectionBasedOnCurrentContext
         */
        public SpringBeanAutowiringSupport() {
            processInjectionBasedOnCurrentContext(this);
        }
    
    
        /**
         * Process {@code @Autowired} injection for the given target object,
         * based on the current web application context.
         * <p>Intended for use as a delegate.
         * @param target the target object to process
         * @see org.springframework.web.context.ContextLoader#getCurrentWebApplicationContext()
         */
        public static void processInjectionBasedOnCurrentContext(Object target) {
            Assert.notNull(target, "Target object must not be null");
            WebApplicationContext cc = ContextLoader.getCurrentWebApplicationContext();
            if (cc != null) {
                AutowiredAnnotationBeanPostProcessor bpp = new AutowiredAnnotationBeanPostProcessor();
                bpp.setBeanFactory(cc.getAutowireCapableBeanFactory());
                bpp.processInjection(target);
            }
            else {
                if (logger.isDebugEnabled()) {
                    logger.debug("Current WebApplicationContext is not available for processing of " +
                            ClassUtils.getShortName(target.getClass()) + ": " +
                            "Make sure this class gets constructed in a Spring web application. Proceeding without injection.");
                }
            }
        }
    

    从网上搜索到的也基本上都解释了这个方法,但是,在spring boot中是不起作用的。
    因为 spring bootServlet Context Initialization 略微不一样

    SpringBootServletInitializer.startup() 使用了自定义的ContextLoaderListener,
    并没有把创建的rootAppContext传给ContextLoader
    所以JAX-WS endpoint 类初始化的时候, SpringBeanAutowiringSupport从ContextLoader.getCurrentWebApplicationContext()取值总是null,@Autowired当然就不能用了。

    public abstract class SpringBootServletInitializer implements WebApplicationInitializer {
    
        @Override
        public void onStartup(ServletContext servletContext) throws ServletException {
            // Logger initialization is deferred in case a ordered
            // LogServletContextInitializer is being used
            this.logger = LogFactory.getLog(getClass());
            WebApplicationContext rootAppContext = createRootApplicationContext(
                    servletContext);
            if (rootAppContext != null) {
                servletContext.addListener(new ContextLoaderListener(rootAppContext) {
                    @Override
                    public void contextInitialized(ServletContextEvent event) {
                        // no-op because the application context is already initialized
                    }
                });
            }
            else {
                this.logger.debug("No ContextLoaderListener registered, as "
                        + "createRootApplicationContext() did not "
                        + "return an application context");
            }
        }
    }
    
    

    好了,找到了问题所在,就好解决了,思路如下。

    1. 初始化时把WebApplicationContext存下来
    2. 参考SpringBeanAutowiringSupport 把WebApplicationContext 拿出来,并使用
    WebApplicationContextLocator.java
    
    @Configuration
    public class WebApplicationContextLocator  implements ServletContextInitializer {
    
        private static WebApplicationContext webApplicationContext;
    
        public static WebApplicationContext getCurrentWebApplicationContext() {
            return webApplicationContext;
        }
    
        /**
         * 在启动时将servletContext 获取出来,后面再读取二次使用。
         * @param servletContext
         * @throws ServletException
         */
        @Override
        public void onStartup(ServletContext servletContext) throws ServletException {
            webApplicationContext = WebApplicationContextUtils.getWebApplicationContext(servletContext);
        }
    }
    
    SpringBootBeanAutowiringSupport.java
    public abstract class SpringBootBeanAutowiringSupport {
    
        private static final Log logger = LogFactory.getLog(SpringBootBeanAutowiringSupport.class);
    
    
        /**
         * This constructor performs injection on this instance,
         * based on the current web application context.
         * <p>Intended for use as a base class.
         * @see #processInjectionBasedOnCurrentContext
         */
        public SpringBootBeanAutowiringSupport() {
            System.out.println("SpringBootBeanAutowiringSupport.SpringBootBeanAutowiringSupport");
            processInjectionBasedOnCurrentContext(this);
        }
    
    
        /**
         * Process {@code @Autowired} injection for the given target object,
         * based on the current web application context.
         * <p>Intended for use as a delegate.
         * @param target the target object to process
         * @see org.springframework.web.context.ContextLoader#getCurrentWebApplicationContext()
         */
        public static void processInjectionBasedOnCurrentContext(Object target) {
            Assert.notNull(target, "Target object must not be null");
            WebApplicationContext cc = WebApplicationContextLocator.getCurrentWebApplicationContext();
            if (cc != null) {
                AutowiredAnnotationBeanPostProcessor bpp = new AutowiredAnnotationBeanPostProcessor();
                bpp.setBeanFactory(cc.getAutowireCapableBeanFactory());
                bpp.processInjection(target);
            }
            else {
                if (logger.isDebugEnabled()) {
                    logger.debug("Current WebApplicationContext is not available for processing of " +
                            ClassUtils.getShortName(target.getClass()) + ": " +
                            "Make sure this class gets constructed in a Spring web application. Proceeding without injection.");
                }
            }
        }
    }
    
    

    结论

    jax-ws 或类似的应用,直接 使用我们改造后的AutowiringSupport即可
    extends SpringBootBeanAutowiringSupport

    相关文章

      网友评论

      • zhuzilou:不错,谢谢分享。尝试了下再也看不到Repo是null了,这下可以大刀阔斧的改架构了。:smiley:
      • BigB:棒棒的

      本文标题:SpringBoot 集成jax-ws无法使用@Autowire

      本文链接:https://www.haomeiwen.com/subject/uxnsbttx.html