spring中的配置文件定义的 dtd,xsd等文件默认是从文件定义的地方加载校验的,比如下面是一个普通的spirng配置
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.1.xsd">
spring启动的时候是要去连接网络的,这样有时候网络不好就会启动不了了,用类路径从本地加载就避免了问题。加载的文件是 xsd文件,这些文件在spring的jar包里, 类路径配置时可用jar包的路径,当然更方便的做法是把这些xsd文件拷贝到soruce目录下(source目录是classpath),这些xsd文件可以直接从网络下载。然后就有了下面的配置
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation=" http://www.springframework.org/schema/beans classpath:spring-beans-4.1.xsd http://www.springframework.org/schema/context classpath:spring-context-4.1.xsd http://www.springframework.org/schema/mvc classpath:spring-mvc-4.1.xsd http://www.springframework.org/schema/aop classpath:spring-aop-4.1.xsd http://www.springframework.org/schema/tx classpath:spring-tx-4.1.xsd">
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