IO流

 1 package day02.com.offcn.test;
 2 
 3 import java.io.*;
 4 
 5 /**
 6  * @author: CC
 7  * @date: 2019/9/8
 8  */
 9 public class IO {
10     //字节流转字符流转高效流
11     public static void main(String[] args) throws IOException {
12         test3();
13     }
14     //打印流  最简单的输出文档
15     public static void test3() throws IOException {
16         PrintWriter printWriter = new PrintWriter(new FileWriter("D:/aa.txt"),true);
17         printWriter.write("大所发生的");
18         printWriter.close();
19     }
20     public static void test() throws IOException {
21         FileInputStream fileInputStream = new FileInputStream("D:/aa.txt");
22         FileOutputStream fileOutputStream = new FileOutputStream("D:/bb.txt");
23 
24         InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream);
25         OutputStreamWriter outPutStreamWriter = new OutputStreamWriter(fileOutputStream);
26 
27         BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
28         BufferedWriter bufferedWriter = new BufferedWriter(outPutStreamWriter);
29 
30         int len = 0;
31         while ((len = bufferedReader.read())!= -1){
32             bufferedWriter.write(len);
33         }
34 
35         bufferedWriter.flush();
36 
37         bufferedReader.close();
38         bufferedWriter.close();
39     }
40     //字节流转高效流
41     public static void test2() throws IOException {
42         FileInputStream fileInputStream = new FileInputStream("D:/aa.txt");
43         FileOutputStream fileOutputStream = new FileOutputStream("D:/bb.txt");
44 
45         BufferedInputStream bufferedInputStream = new BufferedInputStream(fileInputStream);
46         BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(fileOutputStream);
47         int len = 0;
48         while ((len = bufferedInputStream.read())!=-1){
49             bufferedOutputStream.write(len);
50         }
51         bufferedOutputStream.flush();
52 
53         bufferedInputStream.close();
54         bufferedOutputStream.close();
55     }
56     //字符流转高效流
57     public static void test1() throws IOException {
58         FileReader fileReader = new FileReader("D:/aa.txt");
59         FileWriter fileWriter = new FileWriter("D:/bb.txt");
60         BufferedReader bufferedReader = new BufferedReader(fileReader);
61         BufferedWriter bufferedWriter = new BufferedWriter(fileWriter);
62 
63         String len ="";
64         while ((len = bufferedReader.readLine())!= null){
65             bufferedWriter.write(len);
66         }
67 
68         bufferedWriter.flush();
69 
70         bufferedReader.close();
71         bufferedWriter.close();
72     }
73 }