在Spring boot2中手动获取文件的内容

import org.apache.commons.io.IOUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.ResourceLoader;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;

@RestController
@RequestMapping("/file")
public class FileController {

    private final ResourceLoader resourceLoader;

    @Autowired
    public FileController(ResourceLoader resourceLoader) {
        this.resourceLoader = resourceLoader;
    }

    @GetMapping("/content")
    public String getFileContent() throws IOException {
        URL fileUrl = resourceLoader.getResource("classpath:file.txt").getURL();
        InputStream inputStream = fileUrl.openStream();
        String fileContent = IOUtils.toString(inputStream, "UTF-8");
        return fileContent;
    }
}