對於spring的配置檔案中的Import元素節點

<import resource="classpath:spring-shiro.xml"/>

由以下方法解析

1. 委託environment解析resource的路徑,是url就使用完整路徑解析，否則使用相對路徑解析
2. 從readerContext中獲取reader解析所有bean，後面就和第十一篇的流程相同了

protected void importBeanDefinitionResource(Element ele) {
        String location = ele.getAttribute("resource");
        if(!StringUtils.hasText(location)) {
            this.getReaderContext().error("Resource location must not be empty", ele);
        } else {
            location = this.getReaderContext().getEnvironment().resolveRequiredPlaceholders(location);
            Set<Resource> actualResources = new LinkedHashSet(4);
            boolean absoluteLocation = false;

            try {
                absoluteLocation = ResourcePatternUtils.isUrl(location) || ResourceUtils.toURI(location).isAbsolute();
            } catch (URISyntaxException var11) {
                ;
            }

            int importCount;
            if(absoluteLocation) {
                try {
                    importCount = this.getReaderContext().getReader().loadBeanDefinitions(location, actualResources);
                    if(this.logger.isDebugEnabled()) {
                        this.logger.debug("Imported " + importCount + " bean definitions from URL location [" + location + "]");
                    }
                } catch (BeanDefinitionStoreException var10) {
                    this.getReaderContext().error("Failed to import bean definitions from URL location [" + location + "]", ele, var10);
                }
            } else {
                try {
                    Resource relativeResource = this.getReaderContext().getResource().createRelative(location);
                    if(relativeResource.exists()) {
                        importCount = this.getReaderContext().getReader().loadBeanDefinitions(relativeResource);
                        actualResources.add(relativeResource);
                    } else {
                        String baseLocation = this.getReaderContext().getResource().getURL().toString();
                        importCount = this.getReaderContext().getReader().loadBeanDefinitions(StringUtils.applyRelativePath(baseLocation, location), actualResources);
                    }

                    if(this.logger.isDebugEnabled()) {
                        this.logger.debug("Imported " + importCount + " bean definitions from relative location [" + location + "]");
                    }
                } catch (IOException var8) {
                    this.getReaderContext().error("Failed to resolve current resource location", ele, var8);
                } catch (BeanDefinitionStoreException var9) {
                    this.getReaderContext().error("Failed to import bean definitions from relative location [" + location + "]", ele, var9);
                }
            }

            Resource[] actResArray = (Resource[])actualResources.toArray(new Resource[actualResources.size()]);
            this.getReaderContext().fireImportProcessed(location, actResArray, this.extractSource(ele));
        }
    }
 

beans節點解析 實際的解析工作由BeanDefinitionParserDelegate解析

protected void processBeanDefinition(Element ele, BeanDefinitionParserDelegate delegate) {
        BeanDefinitionHolder bdHolder = delegate.parseBeanDefinitionElement(ele);
        if(bdHolder != null) {
            bdHolder = delegate.decorateBeanDefinitionIfRequired(ele, bdHolder);

            try {
                BeanDefinitionReaderUtils.registerBeanDefinition(bdHolder, this.getReaderContext().getRegistry());
            } catch (BeanDefinitionStoreException var5) {
                this.getReaderContext().error("Failed to register bean definition with name '" + bdHolder.getBeanName() + "'", ele, var5);
            }

            this.getReaderContext().fireComponentRegistered(new BeanComponentDefinition(bdHolder));
        }

    }
 

beans節點（相當於從根節點解析） 直接呼叫doRegisterBeanDefinitions方法