CodeFilter

package com.bitbao.cm.common.utils;

public class CodeFilter
{
    public CodeFilter()
    {
    }

    public static String change(String s)
    {
        s = toHtml(s);
        return s;
    }

    // 特殊字符转为Html
    public static String toHtml(String s)
    {
        String b = s;
        System.out.println("开始前 = " + s);
        s = Replace(s, "&", "&");
        s = Replace(s, "<", "&lt;");
        s = Replace(s, ">", "&gt;");
        s = Replace(s, "\t", "         ");
        s = Replace(s, "\r\n", "\n ");
        s = Replace(s, "\r\n", "\n ");
        s = Replace(s, "\n", "<br>");
        s = Replace(s, " ", "&nbsp;");
        s = Replace(s, "'", "&#39;");
        s = Replace(s, "\\", "&#92;");

        // s = Replace(s, "& ", "&amp; ");
        // s = Replace(s, " < ", "&lt; ");
        // s = Replace(s, "> ", "&gt; ");
        // s = Replace(s, "\t ", "         ");
        // s = Replace(s, "\r\n ", "\n ");
        // s = Replace(s, "\r\n", "\n ");
        // s = Replace(s, "\n ", " <br> ");
        // s = Replace(s, "     ", "   &nbsp; ");
        // s = Replace(s, " ' ", "&#39; ");
        // s = Replace(s, "\\ ", "&#92; ");
        /*
         * System.out.println(s.equals(b)); System.out.println("执行后 = "+s);
         */
        return s;
    }

    // 逆
    public static String unHtml(String s)
    {
        s = Replace(s, " <br> ", "\n ");
        s = Replace(s, "&nbsp; ", "   ");
        return s;
    }

    // Replace
    public static String Replace(String source, String oldString,
            String newString)
    {
        if (source == null)
            return null;
        StringBuffer output = new StringBuffer();
        int lengOfsource = source.length();
        int lengOfold = oldString.length();
        int posStart = 0;
        int pos;
        while ((pos = source.indexOf(oldString, posStart)) >= 0)
        {
            output.append(source.substring(posStart, pos));
            output.append(newString);
            posStart = pos + lengOfold;
        }
        if (posStart < lengOfsource)
        {
            output.append(source.substring(posStart));
        }
        return output.toString();
    }

}