Java读取文件和写入文件

Java读取文件和写入文件
1.package com.manze.stu;
2.import java.io.*;
3.//Java教程:www.javaweb.cc
4.public class IOTest {
5.

1. public static void samples() throws IOException {

7.

1. //1. 这是从文件中逐行读入数据

9.

1. BufferedReader in = new BufferedReader(new FileReader("D:\info.txt" ));
2. String s="",s2="";
3. while((s=in.readLine())!=null)
4. s2+=s+"n";
5. in.close();
6. //2. 这是从一个字符串中逐个读入字节
7. StringReader in1 = new StringReader(s2);
8. int c;
9. while ((c = in1.read()) != -1)
10. System .out.print((char)c);

20.

1. //3. 这是将读取的字符串写入另个文件
2. try {
3. BufferedReader in2 = new BufferedReader(new StringReader(s2));
4. PrintWriter out1 = new PrintWriter(new BufferedWriter(new FileWriter("D:\IODemo.txt" )));
5. int lineCount = 1;
6. while ((s = in2.readLine()) != null )
7. out1.println(s);
8. out1.close();
9. } catch (EOFException e) {
10. System .err.println("End of stream" );
11. }
12. }
13. public static void main(String[] arg)
14. {
15. try {
16. IOTest.samples();
17. } catch (IOException e) {
18. // TODO Auto-generated catch block
19. e.printStackTrace();
20. }
21. }

42.

1. }