Spring 中的 ResourceLoader

ResourceLoader 是用来将所需要的资源加载 并封装成 Resource对象

public void printStream(InputStream inputStream) throws IOException {


    Reader reader = new InputStreamReader(inputStream);

    BufferedReader bufferedReader = new BufferedReader(reader);

    String line = null;

    while ( (line = bufferedReader.readLine()) != null) {
        System.out.println(line);
    }
}

1.DefaultResourceLoader

DefaultResourceLoader是 ResourceLoader 一个默认的实现，只能加载单个的资源

@Test
public void getResource() throws IOException {

    ResourceLoader resourceLoader = new DefaultResourceLoader();

    Resource resource = resourceLoader.getResource("beans.xml");

    InputStream inputStream = resource.getInputStream();

    printStream(inputStream);

}


@Test
public void getResourceByPath() throws IOException {

    ResourceLoader resourceLoader = new DefaultResourceLoader();

    Resource resource = resourceLoader.getResource("/com/fll/TestCase.class");

    InputStream inputStream = resource.getInputStream();

    printStream(inputStream);

}

 2.ResourcePatternResolver

 ResourcePatternResolver也是继承了ResourceLoader,但是ResourcePatternResolver又定义了一个加载多个资源的方法，就是按照一个Pattern加载所有符合的资源

PathMatchingResourcePatternResolver一个按照ant风格的路径进行资源匹配加载的实现类

@Test
public void getResources() throws Exception {

    ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();

    Resource[] resources = resourcePatternResolver.getResources("/**");
    Arrays.stream(resources).forEach(
            resource -> {
                if(resource.getFilename().equals("beans.xml")){
                    try {
                        InputStream inputStream = resource.getInputStream();
                        printStream(inputStream);
                    } catch (IOException e) {
                        throw new RuntimeException(e);
                    }
                }else {
                    System.out.println(resource.getFilename());
                }
            }
    );

}

/** 代表加载classpath下的所有资源

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:beans="http://www.springframework.org/schema/beans"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context-2.5.xsd
           http://www.springframework.org/schema/aop
           http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">


    <bean name="person" class="com.fll.start.Person">
        <property name = "name" value = "zhangsan"/>
        <property name = "age" value = "20"/>
    </bean>


</beans>
TestCase.class
AnnotationContainerStartProcess.class
Car.class
InputStreamPrinter.class
Person.class
XmlContainerStartProcess.class
DefaultResourceLoaderTest.class
InputResourceTest.class
ResourcePatternResolverTest.class
SpringStringUtilsTest.class
resource_loader
start
fll
com

可以看到确实匹配到了所有的资源，包括目录