利用BufferedReader 、BufferedWriter 复制文件

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


public class IODemo {
public static void main(String[] args) throws IOException {
BufferedReader bufr=null;
BufferedWriter bufw=null;
try {
bufr=new BufferedReader(new FileReader("G:\\dd.txt"));
bufw=new BufferedWriter(new FileWriter("G:\\d.txt"));
String line=null;
while((line=bufr.readLine())!=null){
bufw.write(line);
bufw.newLine();//*****记住换行
bufw.flush();
}
} catch (IOException e) {
// TODO: handle exception
throw new RuntimeException("读写失败");
}finally{
try {
if(bufr!=null){
bufr.close();
}
} catch (IOException e2) {
throw new RuntimeException("读写失败");
}
      

try {
if(bufw!=null){
bufw.close();
}
} catch (IOException e2) {
throw new RuntimeException("读写失败");
}     
}

}
}