过滤字符串中的HTML字符

public class ServletCharUtils ...{




public static String filter(String input)...{




StringBuffer filtered=new StringBuffer(input.length());


char c;




for(int i=0;i<input.length();i++)...{


c=input.charAt(i);




switch(c)...{


case '<':filtered.append("<");break;


case '>':filtered.append(">");break;


case '"':filtered.append(""");break;


case '&':filtered.append("&");break;


default:filtered.append(c);


}


}


return filtered.toString();


}


}