java学习笔记之BufferedIO

处理流的类型

缓冲流

看栗子：

package io;

import java.io.*;

public class TestBufferStream1 {
    public static void main(String[] args) {
        try {
            FileInputStream fis = new FileInputStream("d:/1.txt");
            BufferedInputStream bis = new BufferedInputStream(fis);
            int c = 0;
            System.out.println(bis.read());//马士兵老师是这样解释的，咣当读一个，咣当再读一个
            System.out.println(bis.read());
            bis.mark(100);//标记到一百个字符
            for (int i = 0; i <= 10 && (c = bis.read()) != -1; i++) {
                System.out.print((char) c + " ");
            }
            System.out.println();
            bis.reset();//回到标记点啦
            for (int i = 0; i <= 10 && (c = bis.read()) != -1; i++) {
                System.out.print((char) c + " ");
            }
            bis.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

疑惑之处：read返回值问题，读8个bit，为什么可以用char转化，mark与reset的用法

那什么字节数组字符数组读啦等等

再举个栗子：

package io;

import java.io.*;
public class TestBufferStream2 {
  public static void main(String[] args) {
    try {
      BufferedWriter bw = new BufferedWriter(new FileWriter("d:\\share\\java\\dat2.txt"));//直接new（路径）是不行的
      BufferedReader br = new BufferedReader(
             new FileReader("d:\\share\\java\\dat2.txt"));
      String s = null;
      for(int i=1;i<=100;i++){
        s = String.valueOf(Math.random());
        bw.write(s);
        bw.newLine();
      }
      bw.flush();
      while((s=br.readLine())!=null){
        System.out.println(s);
      }
      bw.close(); 
      br.close();
    } catch (IOException e) { e.printStackTrace();}
  }
}