public  static void  copyTxt(String sourceFile, String targetFile){

        try{

            String encoding = "GBK";

            File file = new File(sourceFile);

            if(file.exists() && file.isFile()){ //判断文件是否存在

                FileInputStream input = new FileInputStream(file);    //字节流

                FileOutputStream output = new FileOutputStream(new File(targetFile));

                InputStreamReader  read = new InputStreamReader (input,encoding);//字符流

                OutputStreamWriter write = new OutputStreamWriter(output,encoding);

                BufferedReader  bufferedReader  = new BufferedReader (read);//缓冲流

                BufferedWriter  bufferedWriter = new BufferedWriter(write);

                String line = "";

                while ( (line = bufferedReader.readLine() )!= null  ){

                        System.out.println(line);

                        bufferedWriter.write(line + "\n");

                }

                bufferedReader.close();

                bufferedWriter.close();

            }else {

                System.out.println("找不到指定的文件");

            }

        }catch(IOException e){

            System.out.println("读取文件内容出错");

            e.printStackTrace();

        }

    }

}