在控制器方法中读取文件中的数据以保证多线程安全(Spring RestController)

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.concurrent.locks.ReentrantReadWriteLock;

@RestController
@RequestMapping("/data")
public class DataController {
    private final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();

    @GetMapping
    public String getDataFromFile() {
        lock.readLock().lock(); // 获取读锁
        try {
            StringBuilder data = new StringBuilder();
            BufferedReader reader = new BufferedReader(new FileReader("path/to/file.txt"));
            String line;
            while ((line = reader.readLine()) != null) {
                data.append(line);
            }
            reader.close();
            return data.toString();
        } catch (IOException e) {
            e.printStackTrace();
            return "Error reading file";
        } finally {
            lock.readLock().unlock(); // 释放读锁
        }
    }
}