filterhtml.java

JSP聊天系统

package org.ehotsoft.yekki.filter;

public class FilterHtml extends Filter
    implements java.io.Serializable {

    public FilterHtml( Message message ) {

        super( message );
    }

    protected String filter( String content ) {

        return escapeHTMLTags( content );
    }

    private String escapeHTMLTags(String s) {

        if(s == null || s.length() == 0)
            return s;
        StringBuffer stringbuffer = new StringBuffer(s.length() + 6);
        byte byte0 = 32;
        
		for(int i = 0; i < s.length(); i++) {

            char c = s.charAt(i);
            if(c == '<')
                stringbuffer.append("&lt;");
            else
            if(c == '>')
                stringbuffer.append("&gt;");
            else
                stringbuffer.append(c);
        }

        return stringbuffer.toString();
    }
}