Java IO-6 打印流

Posted 2020-09-20

 1 package demo05;
 2 
 3 import java.io.BufferedReader;
 4 import java.io.File;
 5 import java.io.FileNotFoundException;
 6 import java.io.FileOutputStream;
 7 import java.io.FileReader;
 8 import java.io.FileWriter;
 9 import java.io.IOException;
10 import java.io.PrintWriter;
11 
12 public class PrintWriterDemo {
13     public static void main(String[] args) throws IOException {
14          File file = new File("c:\\1.txt");
15          PrintWriter pw = new PrintWriter(file);
16          //原样输出
17          pw.println(100);
18          pw.flush();
19          pw.close();
20          
21          FileOutputStream fos = new FileOutputStream("c:\\2.txt");
22          PrintWriter pw1 = new PrintWriter(fos, true); //自动刷新
23          pw1.println("java");
24          pw1.close();
25          
26          //文件复制
27          BufferedReader bfr = new BufferedReader(new FileReader("c:\\3.txt"));
28          PrintWriter pw11 = new PrintWriter(new FileWriter("d:\\3.txt"));
29          String line = null;
30          while ((line = bfr.readLine()) != null) {
31              pw11.println(line);
32          }
33          pw11.close();
34          bfr.close();
35     }
36     
37     
38 }