io流对文件读写操作

public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new FileReader(new File("C:/book.txt")));
        BufferedWriter bw = new BufferedWriter(new FileWriter("C:/text.txt"));
        String text = "";
        String tmpReader = null;
        while( null != (tmpReader=reader.readLine()) ){
            String[] split = tmpReader.split("--");
            for( int i=0 ; i<split.length ; i++ ){
                text = text+split[i]+"##";
            }
            text = text.substring(0, text.length()-2)+System.getProperty("line.separator");
            bw.write(text);
            text = "" ;
        }
        bw.close();
        reader.close();
    }

将原文本内容中--换为##

单纯的读写操作

    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new FileReader(new File("C:/book.txt")));
        BufferedWriter bw = new BufferedWriter(new FileWriter("C:/text.txt"));
        String tmpReader = null;
        while( null != (tmpReader=reader.readLine()) ){
            bw.write(tmpReader);
        }
        bw.close();
        reader.close();
    }
}

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