学习 Spring (七) Resource
Spring入门篇 学习笔记
Resource: Spring 针对资源文件的统一接口
- UrlResource: URL 对应的资源，根据一个 URL 地址即可构建
- ClassPathResource: 获取类路径下的资源文件
- FileSystemResource: 获取文件系统里面的资源
- ServletContextResource: ServletContext 封装的资源，用于访问 ServletContext 环境下的资源
- InputStreamResource: 针对于输入流封装的资源
- ByteArrayResource: 针对于字节数组封装的资源
ResourceLoader: 所有的 application context 都实现了 ResourceLoader 接口
public interface ResourceLoader{
Resource getResource(String location);
}
ResourceLoader 注入参数前缀：
| 前缀 | 例子 | 解释 |
|---|---|---|
| classpath: | classpath:com/myapp/config.xml | 从 classpath 加载 |
| file: | file:/data/config.xml | 从文件系统加载 |
| http: | http://myserver/logo.png | 从 URL 加载 |
| 无 | /data/config.xml | 依赖于 ApplicationContext |
示例
新建类：
public class MoocResource implements ApplicationContextAware {
private ApplicationContext applicationContext;
@Override
public void setApplicationContext(ApplicationContext applicationContext)
throws BeansException {
this.applicationContext = applicationContext;
}
public void resource() throws IOException {
//Resource resource = applicationContext.getResource("classpath:config.txt");
//Resource resource = applicationContext.getResource("file:E:\\project\\java\\demo\\learningspring\\src\\main\\resources\\config.txt");
//Resource resource = applicationContext.getResource("https://www.cnblogs.com/victorbu/p/10430698.html");
Resource resource = applicationContext.getResource("config.txt");
System.out.println(resource.getFilename());
System.out.println(resource.contentLength());
}
}
添加配置文件：
<?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="moocResource" class="com.karonda.resource.MoocResource" ></bean>
</beans>
添加测试类：
@RunWith(BlockJUnit4ClassRunner.class)
public class TestResource extends UnitTestBase {
public TestResource() {
super("classpath:spring-resource.xml");
}
@Test
public void testResource() {
MoocResource resource = super.getBean("moocResource");
try {
resource.resource();
} catch (IOException e) {
e.printStackTrace();
}
}
}
