Question

如何用java读取一个txt文件内容，再创建一个新的txt文件，把内容保存进去

Answer 1

public static void main(String[] args) throws IOException,
ClassNotFoundException {
try {
FileInputStream in = new FileInputStream(//创建输入流
"E:\\0326java\\javase\\src\\io\\TestFileInputStream.java");
FileOutputStream out = new FileOutputStream("E:\\1.txt");//创建输出流

int i = 0;
while ((i = in.read()) != -1) {
System.out.print((char) i);//循环读取文件数据
out.write(i);//每读一个数据输入到1.txt中
}
out.flush();
out.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

Answer 2

FileInputStream fi=new FileInputStream("e:/1.txt");
BufferedInputStream in=new BufferedInputStream(fi);
FileOutputStream fo=new FileOutputStream("e:/2.txt");
BufferedOutputStream out=new BufferedOutputStream(fo);

byte[] buf=new byte[1024];
int len=in.read(buf);
while(len!=-1){
out.write(buf, 0, len);
len=in.read(buf);
}

out.close();
fo.close();
in.close();
fi.close();

Answer 3

直接使用apache的IoUtils类的copy方法。最简单了。

Answer 4

那就得用到io中读写方法了~看看这部分内容，相信你能搞定的~