java生成文本文件

import  java.io.*;
import java.text.SimpleDateFormat;
import java.util.Date;

//System.getProperty("line.separator") 输出文本的时候　换行

   public  class aa {

        public static void  main (String args[ ]) throws Exception {
        String fenqu="四区"; //分区
        String fuwu="星晴";//服务
            String username="dfg4554";
            String userpass="fdgdg#gdg~";
            String source = "分区："+fenqu+" 服务器："+fuwu+" 登陆账户: "+username+"　密码："+userpass;
            SimpleDateFormat  formatter = new SimpleDateFormat ("yyyyMMddHHmmss");
            String ctime = formatter.format(new Date());          
            FileWriter  f1 = new FileWriter("e:/"+ctime+".txt");
            char[] buffer =new char[source.length()];           
            for  (int i=0; i<source.length(); i++) {
                buffer[i]=source.charAt(i);
             }
            f1.write(buffer);
            f1.close();
        }

}