如何使用数据流和SpringBoot框架通过API端点以JSON格式返回文本文件数据？

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

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

    @GetMapping("/file")
    public Map<String, String> getFileData() throws IOException {
        File file = new File("path/to/your/file.txt");
        FileInputStream fileInputStream = new FileInputStream(file);
        byte[] data = new byte[(int) file.length()];
        fileInputStream.read(data);
        fileInputStream.close();

        String fileContent = new String(data, "UTF-8");

        Map<String, String> response = new HashMap<>();
        response.put("content", fileContent);

        return response;
    }
}

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.13.0</version>
</dependency>