filterurlconverter.java

JSP聊天系统

package org.ehotsoft.yekki.filter;

public class FilterURLConverter extends Filter {

    public FilterURLConverter( Message message ) {

        super( message );
    }
	
	protected String filter( String content ) {
		
		return convertURL( content );
	}

    private String convertURL(String s)
    {
        if(s == null || s.length() == 0)
            return s;
        StringBuffer stringbuffer = new StringBuffer();
        int i = 0;
        int j = 0;
        int k = 0;
        int l = s.length();
        while((i = s.indexOf("http://", k)) >= 0) 
        {
            j = i + 7;
            char c = s.charAt(j);
            while(j < l) 
            {
                if(c == ' ' || c == '<' || c == '\n' || c == '\r' && j < l - 1 && s.charAt(j + 1) == '\n')
                    break;
                if(++j < l)
                    c = s.charAt(j);
            }
            stringbuffer.append(s.substring(k, i));
            stringbuffer.append("<a href =\"");
            stringbuffer.append(s.substring(i, j));
            stringbuffer.append("\">");
            stringbuffer.append(s.substring(i, j));
            stringbuffer.append("</a>");
            k = j;
        }
        stringbuffer.append(s.substring(j, l));
        return stringbuffer.toString();
    }
}