以字符为单位的IO

Code:

1. import java.io.*;  
2. public class WriterTest {  
3.     public static void main(String[] args) throws Exception {  
4.         FileOutputStream fos = new FileOutputStream("D://java//1.txt");  
5.         OutputStreamWriter osw = new OutputStreamWriter(fos);  
6.         BufferedWriter bw = new BufferedWriter(osw);  
7.         bw.write("123456789");  
8.         bw.close();  
9.           
10.         FileInputStream fis = new FileInputStream("D://java//1.txt");  
11.         InputStreamReader isr = new InputStreamReader(fis);  
12.         BufferedReader br = new BufferedReader(isr);  
13.         System.out.print(br.readLine());  
14.         br.close();  
15.           
16.           
17.         InputStreamReader isrin = new InputStreamReader(System.in);  
18.         BufferedReader brin = new BufferedReader(isrin);  
19.         String s;  
20.         while((s = brin.readLine()) != null) {  
21.             System.out.println(s);  
22.         }  
23.         brin.close();  
24.           
25.     }  
26. }