IO流

package day02.com.offcn.test;

import java.io.*;

/**
 * @author: CC
 * @date: 2019/9/8
 */
public class IO {
    //字节流转字符流转高效流
    public static void main(String[] args) throws IOException {
        test3();
    }
    //打印流  最简单的输出文档
    public static void test3() throws IOException {
        PrintWriter printWriter = new PrintWriter(new FileWriter("D:/aa.txt"),true);
        printWriter.write("大所发生的");
        printWriter.close();
    }
    public static void test() throws IOException {
        FileInputStream fileInputStream = new FileInputStream("D:/aa.txt");
        FileOutputStream fileOutputStream = new FileOutputStream("D:/bb.txt");

        InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream);
        OutputStreamWriter outPutStreamWriter = new OutputStreamWriter(fileOutputStream);

        BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
        BufferedWriter bufferedWriter = new BufferedWriter(outPutStreamWriter);

        int len = 0;
        while ((len = bufferedReader.read())!= -1){
            bufferedWriter.write(len);
        }

        bufferedWriter.flush();

        bufferedReader.close();
        bufferedWriter.close();
    }
    //字节流转高效流
    public static void test2() throws IOException {
        FileInputStream fileInputStream = new FileInputStream("D:/aa.txt");
        FileOutputStream fileOutputStream = new FileOutputStream("D:/bb.txt");

        BufferedInputStream bufferedInputStream = new BufferedInputStream(fileInputStream);
        BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(fileOutputStream);
        int len = 0;
        while ((len = bufferedInputStream.read())!=-1){
            bufferedOutputStream.write(len);
        }
        bufferedOutputStream.flush();

        bufferedInputStream.close();
        bufferedOutputStream.close();
    }
    //字符流转高效流
    public static void test1() throws IOException {
        FileReader fileReader = new FileReader("D:/aa.txt");
        FileWriter fileWriter = new FileWriter("D:/bb.txt");
        BufferedReader bufferedReader = new BufferedReader(fileReader);
        BufferedWriter bufferedWriter = new BufferedWriter(fileWriter);

        String len ="";
        while ((len = bufferedReader.readLine())!= null){
            bufferedWriter.write(len);
        }

        bufferedWriter.flush();

        bufferedReader.close();
        bufferedWriter.close();
    }
}