java中缓冲流

BufferedReader：从字符输入流读取文本，缓冲字符，以提供字符，数组和行的高效读取

其构造方法如下

其部分方法如下

这里以读取a.txt中的两行数据为例

import java.io.*;

public class Main {
    public static void main(String[] args) {
        File file = new File("C:\\Users\\Administrator\\Desktop\\a.txt");
        try {
            Reader in = new FileReader(file);
            BufferedReader bufferedReader = new BufferedReader(in);
            String str;
            while ((str = bufferedReader.readLine()) != null) {
                System.out.println(str);
            }
            in.close();
            bufferedReader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

BufferedWriter：将文本写入字符输出流，缓冲字符，以提供单个字符，数组和字符串的高效写入

其构造方法如下

其方法如下

这里以读取a.txt中的两行数据写入到b.txt为例

import java.io.*;

public class Main {
    public static void main(String[] args) {
        File file = new File("C:\\Users\\Administrator\\Desktop\\a.txt");
        File file1 = new File("C:\\Users\\Administrator\\Desktop\\b.txt");
        try {
            Reader in = new FileReader(file);
            Writer out  = new FileWriter(file1);
            BufferedReader bufferedReader = new BufferedReader(in);
            BufferedWriter bufferedWriter = new BufferedWriter(out);

            String str;
            while ((str = bufferedReader.readLine()) != null) {
                bufferedWriter.write(str);
                bufferedWriter.newLine();
            }
            bufferedWriter.flush();
            bufferedReader.close();
            bufferedWriter.close();
            in.close();
            out.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}