Spring 中的 ResourceLoader实例详解
作者：杨过姑父
Spring框架提供了ResourceLoader接口,用于加载资源文件,DefaultResourceLoader是其基本实现,只能加载单个资源,而ResourcePatternResolver继承自ResourceLoader,增加了按模式加载多个资源的能力,感兴趣的朋友一起看看吧
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
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