求字符替换现成函数 (\n换成<br>之类)

Question

jdk1.4中有个很好用的函数，replaceAll()，你可以用它来替换所得到的所有字符，比如replaceAll("\n","<br>")

Answer 1

帮我贴个与replaceAll()功能一样的函数好吗?..

Answer 2

public String replace(String line,String ch,String rep)
{
int i=line.indexOf(ch);
StringBuffer sb=new StringBuffer();
if (i==-1)
return line;
sb.append(line.substring(0,i)+rep);
if(i+ch.length()<line.length())
sb.append(replace(line.substring(i+ch.length(),line.length()),ch,rep));
return sb.toString();
}String test='123'
test=replace(test,"'","&quot;");//'->"在注册时可以用于特殊字符的替换

Answer 3

public static final String replace(String s, String s1, String s2)
    {
        if(s == null || s1 == null || s2 == null)
            return "";
        int i = 0;
        boolean flag = false;
        if((i = s.indexOf(s1, i)) >= 0)
        {
            char ac[] = s.toCharArray();
            char ac1[] = s2.toCharArray();
            int k = s1.length();
            StringBuffer stringbuffer = new StringBuffer(ac.length);
            stringbuffer.append(ac, 0, i).append(ac1);
            i += k;
            int j;
            for(j = i; (i = s.indexOf(s1, i)) > 0; j = i)
            {
                stringbuffer.append(ac, j, i - j).append(ac1);
                i += k;
            }            stringbuffer.append(ac, j, ac.length - j);
            return stringbuffer.toString();
        } else
        {
            return s;
        }
    } public static final String htmlToCode(String s)
    {
        if(s == null)
        {
            return "";
        } else
        {
            s = replace(s, "<p>", "\n\n");
            s = replace(s, "<br>", "\r\n");
            s = replace(s, "&nbsp;&nbsp;&nbsp;&nbsp;", "\t");
            s = replace(s, "&nbsp;", " ");
            s = replace(s, "&lt;", "<");
            s = replace(s, "&gt;", ">");
            s = replace(s, "&amp;", "&");
            return s;
        }
    }  public static final String htmlEncode(String s)
    {
        if(s == null)
            return "";
        char ac[] = s.toCharArray();
        StringBuffer stringbuffer = new StringBuffer(ac.length);
        for(int i = 0; i < ac.length; i++)
        {
            char c = ac[i];
            if(c == '<')
                stringbuffer.append("&lt;");
            else
            if(c == '>')
                stringbuffer.append("&gt;");
            else
            if(c == '"')
                stringbuffer.append("&quot;");
            else
            if(c == '&')
                stringbuffer.append("&amp;");
            else
                stringbuffer.append(c);
        }        return stringbuffer.toString();
    }