BufferedRead陷入无限循环

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class Example {
    public static void main(String[] args) {
        BufferedReader reader = null;
        try {
            reader = new BufferedReader(new FileReader("filename.txt"));
            String line;
            while ((line = reader.readLine()) != null) {
                // 处理读取到的文本行
                System.out.println(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
            // 处理异常，比如关闭输入流或者进行错误处理
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}