Question

编写一个文本文件拷贝的java程序

将文件E:\a.txt 的内容拷贝到E:\b.txt 中

Answer 1

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;

public class filmchange {
/**
* @param args
*/

public static void main(String[] args) {
// TODO Auto-generated method stub
File flsou=new File("E:/a.txt");
File fldec=new File("E:/b.txt");
String context="";
try{
FileReader fr=new FileReader(flsou);
FileWriter fw=new FileWriter(fldec);
BufferedReader br = new BufferedReader(fr);
BufferedWriter bw=new BufferedWriter(fw);
while(br.ready()){
context=br.readLine();
bw.write(context);
bw.newLine();
bw.flush();
}
bw.close();
br.close();
fw.close();
fr.close();
}catch(Exception ex){

}
}
}

Answer 2

FileInputStream fis = new FileInputStream("E:\a.txt");
FileOutputStream fos = new FileOutputStream("E:\b.txt");
byte[] b = new byte[1024];
int len = -1;
while ( (len=fis.read(b))!=-1 ) {
fos.write(b,0,len);
}
fis.close();
fos.close();