Java中PrintWriter使用方法介绍

public class Main {
    public static void main(String[] args) {
        System.out.println("输入源文件");
        String s = new Scanner(System.in).nextLine();
        File from = new File(s);
        if (!from.isFile()) {
            System.out.println("请输入正确的文件路径");
            return;
        }
        System.out.println("输入目标文件");
        s = new Scanner(System.in).nextLine();
        File to = new File(s);
        if (to.isDirectory()) {
            System.out.println("请输入具体的文件路径，不是目录路径");
            return;
        }

        System.out.println("输入原文件字符编码");
        String fromCharset = new Scanner(System.in).nextLine();
        System.out.println("输入目标文件字符编码");
        String toCharset = new Scanner(System.in).nextLine();

        try {
            copy(from, to, fromCharset, toCharset);
            System.out.println("复制成功");
        } catch (Exception e) {
            System.out.println("复制失败");
        }
    }
    private static void copy(File from, File to, String fromCharset, String toCharset) throws Exception {
        // TODO Auto-generated method stub
        /**
         * 				BufferedReader
         * 			InputStreamReader,fromCharset
         *		FileInputStream
         *	from
         *
         *				PrintWriter
         *			OutputStreamWriter,toCharset
         *		FileOutputStream
         *	to
         *
         *	循环按行读写
         *
         * */

        BufferedReader in = new BufferedReader(
                new InputStreamReader(
                        new FileInputStream(from), fromCharset));

        PrintWriter out = new PrintWriter(
                new OutputStreamWriter(
                        new FileOutputStream(to), toCharset));

        String line;
        while ((line = in.readLine()) != null) {
            out.println(line);
        }
        in.close();
        out.close();
    }
}