方式很多，读出来再写入进去，在后追加或是重写都行，这里写了个小例子：
import java.io.*;
public class TestBufferStream{
public static void main(String[] args){
try{
BufferedReader in = new BufferedReader(new FileReader("in.txt"));
BufferedWriter out = new BufferedWriter(new FileWriter("out.txt"));
String s = null;
while((s = in.readLine()) != null){
out.write(s);
out.newLine();
}
out.flush();
in.close();
out.close();
}catch(IOException e){
e.printStackTrace();
}
}
}
详细可以参考：http://blog.csdn.net/tjcyjd/article/details/6890403
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