读取txt格式文件输出(点击下载txt模板)

String txtPath = req.getParameter("txtPath");//txt文件的路径
        
        String fileName = "swatch.txt";
        resp.setContentType("text/plain");
        resp.setCharacterEncoding("UTF-8");
        resp.addHeader("Content-Disposition","attachment;fileName=" + fileName);
        
        URL url = new URL(txtPath);
        URLConnection conn = url.openConnection();
        BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream(),"UTF-8"));
        BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(resp.getOutputStream()));
        
        String line = null;
        try {
            while ((line = reader.readLine()) != null) {
                writer.write(line);
                System.out.println(line);
                writer.newLine();
                writer.flush();
            }
        } finally {
            reader.close();
            writer.close();
        }