基于【字符】操作的IO接口：Writer、Reader

Reader

public class BufferedReaderTest {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream("e:/abc.txt")));
        String str = "";
        while ((str = br.readLine()) != null) {
            System.out.println(str);
        }
        br.close();
    }
}

Writer

public class BufferedWriterTest {
    public static void main(String[] args) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream("e:/abc.txt")));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("e:/b.txt")));
        String str = "";
        while ((str = br.readLine()) != null) {
            bw.write(str);
            bw.newLine();
        }
        bw.close();
        br.close();
    }
}

public class PrintWriterTest {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream("e:/abc.txt")));
        PrintWriter pw = new PrintWriter(new File("e:/b.txt"));
        String str = "";
        while ((str = br.readLine()) != null) {
            pw.write(str + "\r\n");
        }
        pw.flush();
        br.close();
        pw.close();
    }
}