public static void main(String[] args) throws Exception {  
    //读取文件  
    InputStreamReader isr = new InputStreamReader(new FileInputStream("C:\\\\Users\\\\Administrator\\\\Desktop\\\\新建文本文档.txt"), "UTF-8");  
    BufferedReader wb = new BufferedReader(isr);  
    String line = null;  
    while((line=wb.readLine())!=null){  
        System.out.println(line);  
    }  
    isr.close();  
    //写入（追加）文件  
    OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("C:\\\\Users\\\\Administrator\\\\Desktop\\\\新建文本文档.txt",true),"UTF-8");  
    BufferedWriter bw = new BufferedWriter(osw);  
    bw.newLine();  
    bw.write("有声有色");//将它写入缓存中，如果缓存满了则自己flush;  
    bw.flush();  
    osw.close();  
}