字符流

    String path = "D:\\dome.txt";   //文件路径    File file = new File(path);//生成文件对象    FileWriter fw = new FileWriter(file,true);//true 写进去的内容不覆盖原先的内容，false 覆盖    String ss = "hgkdhgk";    fw.write(ss);//把内容写进去    System.out.println("-----------");    FileReader fr = new FileReader(file);    char[] c = new char[1024];//字符数组容器    while(fr.read(c)>0){//讲读取的内容放在字符容器中，并返回读取的大小         System.out.print(c);    }    BufferedReader br = new  BufferedReader(fr);     System.out.println(br.readLine());//读取一行     BufferedWriter bw = new BufferedWriter(fw);     bw.write("jdfhdjhgjhgj");//把内容写进去