今天在看Spring官网的一些例子的时候，发现，他的很多xsd的引用都是没带版本号的，如图所示：
为了弄清楚是怎么回事，就得了解Spring是怎么加载xsd文件来校验xml文件的，记得之前就碰到过断网校验不了的情况，后面为了防止这种情况，Spring默认会从本地加载xsd文件
在spring发行的包里面，看到了，
spring-context-4.2.6.RELEASE.jar\META-INF
spring.handlers文件
http\://www.springframework.org/schema/context=org.springframework.context.config.ContextNamespaceHandler http\://www.springframework.org/schema/jee=org.springframework.ejb.config.JeeNamespaceHandler http\://www.springframework.org/schema/lang=org.springframework.scripting.config.LangNamespaceHandler http\://www.springframework.org/schema/task=org.springframework.scheduling.config.TaskNamespaceHandler http\://www.springframework.org/schema/cache=org.springframework.cache.config.CacheNamespaceHandler
spring.schemas文件
http\://www.springframework.org/schema/context/spring-context-2.5.xsd=org/springframework/context/config/spring-context-2.5.xsd http\://www.springframework.org/schema/context/spring-context-3.0.xsd=org/springframework/context/config/spring-context-3.0.xsd http\://www.springframework.org/schema/context/spring-context-3.1.xsd=org/springframework/context/config/spring-context-3.1.xsd http\://www.springframework.org/schema/context/spring-context-3.2.xsd=org/springframework/context/config/spring-context-3.2.xsd http\://www.springframework.org/schema/context/spring-context-4.0.xsd=org/springframework/context/config/spring-context-4.0.xsd http\://www.springframework.org/schema/context/spring-context-4.1.xsd=org/springframework/context/config/spring-context-4.1.xsd http\://www.springframework.org/schema/context/spring-context-4.2.xsd=org/springframework/context/config/spring-context-4.2.xsd http\://www.springframework.org/schema/context/spring-context.xsd=org/springframework/context/config/spring-context-4.2.xsd http\://www.springframework.org/schema/jee/spring-jee-2.0.xsd=org/springframework/ejb/config/spring-jee-2.0.xsd http\://www.springframework.org/schema/jee/spring-jee-2.5.xsd=org/springframework/ejb/config/spring-jee-2.5.xsd http\://www.springframework.org/schema/jee/spring-jee-3.0.xsd=org/springframework/ejb/config/spring-jee-3.0.xsd http\://www.springframework.org/schema/jee/spring-jee-3.1.xsd=org/springframework/ejb/config/spring-jee-3.1.xsd http\://www.springframework.org/schema/jee/spring-jee-3.2.xsd=org/springframework/ejb/config/spring-jee-3.2.xsd http\://www.springframework.org/schema/jee/spring-jee-4.0.xsd=org/springframework/ejb/config/spring-jee-4.0.xsd http\://www.springframework.org/schema/jee/spring-jee-4.1.xsd=org/springframework/ejb/config/spring-jee-4.1.xsd http\://www.springframework.org/schema/jee/spring-jee-4.2.xsd=org/springframework/ejb/config/spring-jee-4.2.xsd http\://www.springframework.org/schema/jee/spring-jee.xsd=org/springframework/ejb/config/spring-jee-4.2.xsd http\://www.springframework.org/schema/lang/spring-lang-2.0.xsd=org/springframework/scripting/config/spring-lang-2.0.xsd http\://www.springframework.org/schema/lang/spring-lang-2.5.xsd=org/springframework/scripting/config/spring-lang-2.5.xsd http\://www.springframework.org/schema/lang/spring-lang-3.0.xsd=org/springframework/scripting/config/spring-lang-3.0.xsd http\://www.springframework.org/schema/lang/spring-lang-3.1.xsd=org/springframework/scripting/config/spring-lang-3.1.xsd http\://www.springframework.org/schema/lang/spring-lang-3.2.xsd=org/springframework/scripting/config/spring-lang-3.2.xsd http\://www.springframework.org/schema/lang/spring-lang-4.0.xsd=org/springframework/scripting/config/spring-lang-4.0.xsd http\://www.springframework.org/schema/lang/spring-lang-4.1.xsd=org/springframework/scripting/config/spring-lang-4.1.xsd http\://www.springframework.org/schema/lang/spring-lang-4.2.xsd=org/springframework/scripting/config/spring-lang-4.2.xsd http\://www.springframework.org/schema/lang/spring-lang.xsd=org/springframework/scripting/config/spring-lang-4.2.xsd http\://www.springframework.org/schema/task/spring-task-3.0.xsd=org/springframework/scheduling/config/spring-task-3.0.xsd http\://www.springframework.org/schema/task/spring-task-3.1.xsd=org/springframework/scheduling/config/spring-task-3.1.xsd http\://www.springframework.org/schema/task/spring-task-3.2.xsd=org/springframework/scheduling/config/spring-task-3.2.xsd http\://www.springframework.org/schema/task/spring-task-4.0.xsd=org/springframework/scheduling/config/spring-task-4.0.xsd http\://www.springframework.org/schema/task/spring-task-4.1.xsd=org/springframework/scheduling/config/spring-task-4.1.xsd http\://www.springframework.org/schema/task/spring-task-4.2.xsd=org/springframework/scheduling/config/spring-task-4.2.xsd http\://www.springframework.org/schema/task/spring-task.xsd=org/springframework/scheduling/config/spring-task-4.2.xsd http\://www.springframework.org/schema/cache/spring-cache-3.1.xsd=org/springframework/cache/config/spring-cache-3.1.xsd http\://www.springframework.org/schema/cache/spring-cache-3.2.xsd=org/springframework/cache/config/spring-cache-3.2.xsd http\://www.springframework.org/schema/cache/spring-cache-4.0.xsd=org/springframework/cache/config/spring-cache-4.0.xsd http\://www.springframework.org/schema/cache/spring-cache-4.1.xsd=org/springframework/cache/config/spring-cache-4.1.xsd http\://www.springframework.org/schema/cache/spring-cache-4.2.xsd=org/springframework/cache/config/spring-cache-4.2.xsd http\://www.springframework.org/schema/cache/spring-cache.xsd=org/springframework/cache/config/spring-cache-4.2.xsd
可以看到，没有配置版本号的时候，默认就是使用最新的
http\://www.springframework.org/schema/context/spring-context.xsd=org/springframework/context/config/spring-context-4.2.xsd
原文地址：http://enetq.blog.51cto.com/479739/1783360
