文件读写3

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;


public class Filedemo3 {


public static void main(String[] args) {

try {

//字节流读写文件

FileReader fr = new FileReader("test.txt");
BufferedReader  br = new BufferedReader(fr);

FileWriter fw = new FileWriter("testw.txt");
BufferedWriter bw = new BufferedWriter(fw);

String line;

while ((line = br.readLine()) != null) {
bw.write(line + "\n");
}

bw.flush();//强制缓冲区输出
bw.close();
fw.close();
br.close();
fr.close();

} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}







}


}