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

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 "/classes", "/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.