public static void fileput(String filePath) {
        int a = 0;
        FileReader fr = null;
        FileWriter fw = null;
        try {
            fr = new FileReader(filePath);
            fw = new FileWriter("c:/javatest/cool.txt");
            while ((a = fr.read()) != -1) {
                fw.write(a);
            }
        } catch (IOException e1) {
            System.out.println("就是错误！");
        } finally {
            if (fr != null) {
                try {
                    fr.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (fw != null) {
                try {
                    fw.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }