Resource接口

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我们知道spring框架中的IOC容器就是将对象与对象之间的依赖关系从代码中转移到了配置文件中,所以在spring的底层就要涉及到很多对配置文件的读取与加载。但是在Java中提供的File类并不能很方便的满足对各种资源的访问需求,所以spring为了方便的处理各种配置文件的读取,于是设计了Resource接口。虽然设计它的本意是给spring框架使用的,但是我们也可以可以直接在项目中使用Resource接口来读取我们自己的配置文件。在这个接口中我们主要看3个实现类ClassPathResource、FileSystemResource、UrlResource。我们分别看这3个实现类的区别。

public class ResourceTest {
public static void main(String[] args) throws IOException {
ClassPathResource classPathResource = new ClassPathResource("bean.xml");
System.out.println(IOUtils.toString(classPathResource.getInputStream(), "utf-8"));
}
}
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="userDetail" class="com.jilinwula.spring.UserDetail"/>     <bean id="userDetailAble" class="com.jilinwula.spring.UserDetailAbleImpl"/>

    <!-- 构造函数注入 start -->     <bean id="userInfo1" class="com.jilinwula.spring.UserInfo">         <constructor-arg name="userDetail" ref="userDetail"/>     </bean>     <!-- 构造函数注入 end -->

    <!-- 属性注入 start -->     <bean id="userInfo2" class="com.jilinwula.spring.UserInfo">         <property name="userDetail" ref="userDetail"/>     </bean>     <!-- 属性注入 end -->

    <!-- 接口注入 start -->     <bean id="userInfo3" class="com.jilinwula.spring.UserInfo">         <property name="userDetailAble" ref="userDetailAble"/>     </bean>     <!-- 接口注入 end -->

</beans>

public class ResourceTest {
public static void main(String[] args) throws IOException {
FileSystemResource fileSystemResource = new FileSystemResource("/Users/jilinwula/IdeaProjects/spring-jilinwula/src/main/resources/bean.xml");
System.out.println(IOUtils.toString(fileSystemResource.getInputStream(), "utf-8"));
}
}
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="userDetail" class="com.jilinwula.spring.UserDetail"/>     <bean id="userDetailAble" class="com.jilinwula.spring.UserDetailAbleImpl"/>

    <!-- 构造函数注入 start -->     <bean id="userInfo1" class="com.jilinwula.spring.UserInfo">         <constructor-arg name="userDetail" ref="userDetail"/>     </bean>     <!-- 构造函数注入 end -->

    <!-- 属性注入 start -->     <bean id="userInfo2" class="com.jilinwula.spring.UserInfo">         <property name="userDetail" ref="userDetail"/>     </bean>     <!-- 属性注入 end -->

    <!-- 接口注入 start -->     <bean id="userInfo3" class="com.jilinwula.spring.UserInfo">         <property name="userDetailAble" ref="userDetailAble"/>     </bean>     <!-- 接口注入 end -->

</beans>

public class ResourceTest {
public static void main(String[] args) throws IOException {
UrlResource urlResource = new UrlResource("https://www.baidu.com");
System.out.println(IOUtils.toString(urlResource.getInputStream(), "utf-8"));
}
}
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