如何用java从txt读取文本，并处理后输出新的文本

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();
}
}