I/O dempo

标准读取写入

package io_stream;

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

public class FilePwd {

	public static void main(String[] args) {

		// TODO Auto-generated method stub

		fileIn();

	}

	public static void fileIn() {

//		FileInputStream r = null;

//		FileOutputStream w = null;

		try (BufferedInputStream r = new BufferedInputStream(new FileInputStream("src/file/file02.txt"));

			BufferedOutputStream w =new BufferedOutputStream(new FileOutputStream("src/file/pwd.txt")))

		{

			byte[] bytes = new byte[20];// 定义每次读取字节数量

			int temp;

			while ((temp = r.read()) != -1) {// 判断是否读完

				System.out.println(temp);

				w.write(temp);// 写入文件

                                w.write(temp^77);// 文件加密,解密时异或相同的数字即可

				//System.out.println("写入成功");

			}

		}catch (FileNotFoundException e) {

				e.printStackTrace();

		}catch (IOException e) {

			e.printStackTrace();

		}

	}

}

.read()返回的是整数类型,.write()整数类型时,写入对应ascll码的字符,并且只能写入整数类型和char类型

字符流:每次读取一个字符FileReader fr = new FileReader("word.txt");

缓冲字符流:每次读取一行字符,

字符流不能用于非文本文件,如图片

结构图

I/O dempo

包装类

包装字节流为字符流

InputStreamReader isr = new InputStreamReader(System.in); // 将标准字节输入流包装成字符输入流, system.in为标准字节输入流

InputStreamReader isr1 = new InputStreamReader(new FileInputStream("a")); // 将标准字节输入流包装成字符输入流

包装普通流为高效缓冲流

字节:BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("a"));

字符:BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); // 包装成缓冲字符输入流

包装类

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