Spring Boot get resource file example 2016-08-19 05:22
I have written the blog Read values from properties file in Spring to show how to get values from properties file. In this blog I will show you how to get resource file (not only properties file) in Spring. As using maven build the project all resource file are put in resources folder.
project structure
├─main
│ ├─java
│ │ └─com
│ │ └─henryxi
│ │ └─resources
│ │ ResourcesController.java
│ │
│ └─resources
│ application.properties
│ test.txt
│
└─test
└─java
pom.xml
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.4</version>
</dependency>
</dependencies>
resourcesController.java
@RestController
@EnableAutoConfiguration
public class ResourcesController {
@Autowired
private ResourceLoader resourceLoader;
@RequestMapping(value = "/get-resources", method = RequestMethod.GET)
public String getResources() throws IOException {
String content = IOUtils.toString(resourceLoader.getResource("classpath:test.txt").getInputStream());
return "the content of resources:" + content;
}
public static void main(String[] args) {
SpringApplication.run(ResourcesController.class, args);
}
}
Run this class and access http://localhost:8080/get-resources the output like following
the content of resources:this is a test file
About classpath
In Maven project all resource will be copied to classes folder (if you not specify the resources folder). classpath in Tomcat contains "<project_path>/classes", "<project_path>/lib" and other path in Tomcat. After injecting ResourceLoader into controller use resourceLoader.getResource("classpath:test.txt") to find the file "test.txt" in classpath.