Java读取输入/输出将重复字符串打印到文件

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

BufferedReader reader = null;
BufferedWriter writer = null;

try {
    reader = new BufferedReader(new FileReader("input.txt"));
    writer = new BufferedWriter(new FileWriter("output.txt"));
    
    // 读取输入文件内容并重复写入输出文件
    String line;
    while ((line = reader.readLine()) != null) {
        writer.write(line);
        writer.newLine();
    }
} catch (IOException e) {
    e.printStackTrace();
} finally {
    try {
        if (reader != null) {
            reader.close();
        }
        if (writer != null) {
            writer.close();
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
}